JPH1022944A - Antenna abnormality detection method and device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide an antenna abnormality detection method and apparatus capable of reliably performing antenna abnormality detection even when the installation state or type of connection cable fluctuates. SOLUTION: A base station S connected to the base station S
A monitoring means M for monitoring a signal level of a reflected wave when a reference signal of a predetermined frequency band is transmitted to a plurality of antennas A;
A storage unit 7 (level storage means) for storing a signal level monitoring a state where the base station S is connected to the base station S by the connection cable and a state where the connection to the connection cable on the antenna A side is disconnected, and a base station S And a storage unit 6 for monitoring the signal level of the reflected wave by the reference signal transmitted from the base station S at predetermined time intervals during the operation of and performing a comparison with the level storage data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method and an apparatus for detecting an antenna abnormality.

[0002]

2. Description of the Related Art In some radio apparatuses, an abnormal antenna which is a trouble such as breakage of an antenna element is detected by monitoring the level of a reflected wave signal from the antenna which is transmitted to the antenna. In general, the connection between a wireless device and an antenna for transmitting a wireless signal from the wireless device depends on the application or use conditions of the wireless device, when the wireless device is directly connected to the wireless device main body, or when a connection cable such as a coaxial cable is used. It is divided into the case where it is connected by using. When the latter is connected to the wireless device using a coaxial cable or the like, the length of the coaxial cable is generally not constant, and the type of the coaxial cable is often different.

In the wireless device, when detecting an abnormal antenna which is a fault such as breakage of an antenna element by the above-described method, the above-mentioned variation in the impedance of the connection line due to the change in the length and type of the connection cable is not sufficient for the detection accuracy. It has a significant effect. However, conventionally, in the above-described antenna abnormality detection method, the connection terminal between the wireless device and the antenna connection cable is opened to monitor the magnitude of the reflected wave signal with respect to the transmission signal output only in the wiring within the device, and monitor the monitor. A loss value based on a predetermined connection cable wiring condition is subtracted from the value to be a reference value for detecting an antenna abnormality. During operation, the above-described antenna abnormality is detected by periodically detecting a reflected wave signal due to a transmission signal from the antenna and detecting that the increase in the reflected wave signal is greater than the reference value.

[0004]

However, the wiring length between the connection terminal and the terminal of the antenna body is long.
When it is assumed that the loss of the connection cable is large, the loss value subtracted from the monitor value when setting the above reference value is large. Therefore, when the antenna element is broken or the like, the reflected wave signal caused by the transmission signal is hardly reduced, and the antenna abnormality may not be detected. Conversely, in the case where the amount to be subtracted as the amount of loss is reduced to make it easier to detect an antenna abnormality, there is a problem that when the loss is large depending on the type of coaxial cable, a normal state is detected as an antenna abnormality.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object the purpose of the present invention is to provide an antenna antenna capable of reliably detecting an antenna abnormality even when the installation state or type of a connection cable fluctuates. An object of the present invention is to provide a detection method and device.

[0006]

In order to achieve the above object, an antenna abnormality detecting apparatus according to claim 1 is provided for transmitting a predetermined frequency band from a radio apparatus to one or more antennas connected to the radio apparatus. Monitor means for monitoring the signal level of the reflected wave when the reference signal is transmitted, and the monitor means disconnects the connection between the antenna and the connection cable on the antenna side when the antenna is connected to the wireless device by the connection cable. Level storage means for storing a signal level monitoring the state of the wireless device, and monitoring the signal level of a reflected wave by the reference signal transmitted from the wireless device at predetermined time intervals during operation of the wireless device and storing the level. Comparing means for comparing with data. Thereby, the signal level of the reflected wave when the reference signal of the predetermined frequency band is transmitted toward one or more antennas connected to the wireless device by the monitor means is monitored, and the antenna is monitored by the monitor means by the level storage means. A signal level monitoring a state where the wireless device is connected to the connection cable by the connection cable and a state where the connection with the connection cable on the antenna side is disconnected are stored, and the comparison unit wirelessly operates at a predetermined time interval during operation of the wireless device. The signal level of the reflected wave by the reference signal sent from the device is monitored and compared with the level storage data.

According to a second aspect of the present invention, there is provided an antenna abnormality detecting method, comprising: transmitting a reference signal in a predetermined frequency band from a wireless device to an antenna connected to the wireless device by a connection cable; The signal levels of the reflected waves in the state where the radio apparatus is connected to the radio apparatus by the cable and the state where the connection on the antenna side is disconnected are respectively monitored, and this monitoring result is stored in advance as level storage data, and when the radio apparatus is operated. The reference signal is transmitted at predetermined time intervals, the signal level of the reflected wave is monitored, and the abnormality of the antenna is detected by comparing the monitored result data with the level storage data. Thus, the state in which the antenna is connected to the wireless device by the connection cable and the state in which the connection on the antenna side is disconnected are caused by a predetermined frequency band from the wireless device to the antenna connected to the wireless device by the connection cable. Is monitored by the signal level of each reflected wave when the reference signal is transmitted, and the data of the monitoring result is stored in advance as level storage data, and the reference signal is transmitted at predetermined time intervals during operation of the wireless device. The signal level of the reflected wave is monitored, and the data of the monitoring result is compared with the level storage data to detect an abnormal antenna.

According to a third aspect of the present invention, there is provided an antenna abnormality detecting device for monitoring a signal level of a received wave received by one or a plurality of antennas connected to the wireless device;
Time storage means for accumulating and storing the time selected and used from the result of monitoring the signal level of the received wave within a predetermined time when the antenna is connected to the wireless device by a connection cable by the monitor means And comparing means for monitoring the signal level of the received wave received by the wireless device at predetermined time intervals during operation of the wireless device and comparing the signal level with the time storage data. Thus, the signal level of the received wave received by the one or more antennas connected to the wireless device is monitored by the monitor means, and the time storage means controls the state in which the antenna is connected to the wireless device by the connection cable by the monitor means. The signal level of the received wave within a predetermined time at the time is selected from the monitored result, the time used is accumulated and stored, and received by the wireless device at predetermined time intervals during operation of the wireless device by the comparing means. The signal level of the received wave is monitored and compared with the time storage data.

According to a fourth aspect of the present invention, there is provided a method for detecting an abnormality of an antenna, wherein a signal level of a received wave from each antenna connected to the wireless device by a connection cable is monitored and selected and used within a predetermined time. Accumulate time, pre-store the accumulation result as time storage data,
At the time of operation of the wireless device, the time at which each antenna is selected and used at predetermined time intervals is accumulated, and data of the accumulated result is compared with the time storage data to detect an antenna abnormality. This allows
The time selected and used within a predetermined time of each antenna is monitored and accumulated by the signal level of the received wave from each antenna connected to the wireless device by the connection cable, and the accumulated result is stored in the time storage data. As the antenna is selected and used for each predetermined time interval during operation of the wireless device, the time used is accumulated, and the data of this accumulation result is compared with the time storage data, whereby an antenna abnormality is detected. Is detected.

According to a fifth aspect of the present invention, there is provided an antenna abnormality detecting device, wherein a reflected wave signal is output when a reference signal of a predetermined frequency band is transmitted from a wireless device to one or more antennas connected to the wireless device. Monitoring means for monitoring the level and the signal level of the received wave received by the antenna; and a state in which the antenna is connected to the wireless device by a connection cable by the monitor means, and the connection cable between the antenna and the antenna is disconnected. Level storage means for storing a signal level for monitoring the state, and a result of monitoring the signal level of the received wave within a predetermined time when the antenna is connected to the wireless device by a connection cable by the monitor means Time storage means for accumulating and storing time selected and used from the wireless device, and the wireless device at predetermined time intervals during operation of the wireless device Comparison means for monitoring the signal level of the received wave to be received and comparing the signal with the time storage data, and transmitting the reference signal from the wireless device to monitor the signal level of the reflected wave and to compare with the level storage data. And Thus, the signal level of the reflected wave and the signal level of the received wave received by the antenna when the reference signal of the predetermined frequency band is transmitted to one or more antennas connected to the wireless device by the monitoring means are monitored. The signal level monitoring the state where the antenna is connected to the wireless device by the connection cable and the state where the antenna is disconnected from the connection cable on the antenna side are stored by the level storage means and the time storage means The monitor means monitors the signal level of the received wave within a predetermined time when the antenna is connected to the wireless device by the connection cable, selects and uses the result from the result of monitoring, and accumulates and uses the time. During operation of the wireless device, the signal level of a received wave received by the wireless device at a predetermined time interval is monitored. It becomes that the time storage data and comparison is made the signal level of the reflected wave transmitted is being made of the reference signal from the wireless device with the data is compared to the level stored data while being monitored.

According to a sixth aspect of the present invention, there is provided an antenna abnormality detecting method for transmitting a reference signal in a predetermined frequency band from a wireless device to each of the antennas connected to the wireless device by a connection cable. Monitor the signal level of the reflected wave in a state where the wireless device is connected to the wireless device by a connection cable and in a state where the connection on the antenna side is disconnected, and store the monitoring result in advance as level storage data, Monitor the signal level of the received wave from each of them, and accumulate the time used for selection and use within a predetermined time, preliminarily store this accumulation result as time storage data, and at predetermined time intervals during operation of the wireless device. The time when each antenna is selected and used is accumulated, and the data of the accumulated result is compared with the time storage data. The wireless device transmits the reference signal toward the antenna to monitor the signal level of the reflected wave, and compares the monitored result data with the level storage data. In this way, the antenna abnormality is detected. Thus, the state in which the antenna is connected to the wireless device by the connection cable and the state in which the connection on the antenna side is disconnected are caused by a predetermined frequency band from the wireless device to the antenna connected to the wireless device by the connection cable. Is monitored by the signal level of each reflected wave when the reference signal is transmitted, and the data of the monitoring result is stored in advance as level storage data, and the time to be selected and used within a predetermined time of each antenna is determined by the radio. The signal is monitored and accumulated by the signal level of the received wave from each antenna connected to the device by the connection cable, and the accumulated result is stored in advance as time storage data, and each operation is performed at predetermined time intervals during operation of the wireless device. The time when the antenna is selected and used is accumulated, and the data of the accumulation result is stored in the time. An unused antenna is detected by comparing the data with the data, a reference signal is transmitted from the wireless device to the antenna, and the signal level of the reflected wave is monitored. The data of the monitoring result and the level storage are stored. An antenna abnormality is detected by comparing the data with the data.

According to a seventh aspect of the present invention, in the antenna abnormality detecting apparatus according to any one of the first to third aspects, the monitor means receives the reference signal transmitted from the wireless device and inputs the reference signal to the antenna. And a circulating unit that can output a signal of the reflected wave from the antenna and output the signal to the comparison unit. Thereby, the monitoring means inputs the reference signal transmitted from the wireless device by the circulating unit, outputs the reference signal to the antenna, inputs the signal of the reflected wave from the antenna, and outputs the signal to the comparing means. Become.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of an antenna abnormality detecting device according to the present invention will be described based on FIG. 1, a second embodiment will be described based on FIG. 2, and a third embodiment will be described. Each will be described with reference to FIG.

[First Embodiment] FIG. 1 is a circuit configuration diagram of an antenna abnormality detecting device.

The antenna abnormality detecting device 1 is, for example, a P
It is built in the base station S, which is a wireless device of the HS telephone system, and detects an antenna abnormality which is a failure such as breakage of an antenna element. The monitoring unit M, the control unit 6 as a comparison unit, and the storage unit 7 It has.

The monitoring means M monitors a signal of a reflected wave when a reference signal of a predetermined frequency band is transmitted from the base station S to one antenna A connected to the base station S. 2, a detection unit 3, a waveform shaping unit 4, and D
And a C amplifying unit 5. At the time of installation of the base station S and the like, a state where the antenna A is connected to the base station S by the connection cable and a state where the antenna A is disconnected from the connection cable on the antenna side are monitored. The reflected wave signal of the reference signal transmitted from the base station S is monitored at intervals.

The circulating unit 2 receives a transmission signal output from an amplifier circuit S1 which is a front end of a main circuit of the base station S, outputs the signal to an antenna A, and receives a signal of a reflected wave from the antenna A. The signal is output to a control unit 6 described later, and in this embodiment, is constituted by a circulator. The circulating unit 2 may be various other than a circulator, such as a directional coupler. This circulator receives a transmission signal and receives a transmission output terminal T
1. A transmission signal is circulated between the detection unit 3 and a wiring path to each antenna element end of the antenna A via the connection cable C. Specifically, the electromagnetic wave coming in from the terminal a shown in FIG. 1 goes out only to the terminal b and does not go out to the terminal c, and the electromagnetic wave coming in from the terminal b goes out to the terminal c and does not go out to the terminal a. The electromagnetic wave entering from c has three terminals such that the electromagnetic wave enters terminal a and does not exit terminal b. By this circulating unit 2, a reference signal of a predetermined frequency band input from the amplifying circuit S 1 to the circulating unit 2 is transmitted to the antenna A via the connection cable C.
And the reflected wave signal from each element (not shown) of the antenna A is received and output to the detector 3.

The detection section 3 detects a monitor signal which is a signal of a reflected wave from the antenna A based on a reference signal of a predetermined frequency band inputted from the circulating section 2. The monitor unit 3 detects the monitor signal, which is an AC signal, and converts the monitor signal into a DC signal containing a gentle fluctuation component.

The waveform shaping section 4 is for shaping a monitor signal of a DC signal containing a gentle fluctuation component inputted from the detection section 3, and is formed by a low-pass filter circuit. The monitor signal is converted into a low-frequency signal containing a DC component by the low-pass filter circuit, and is DC-amplified by a DC amplifying unit 5 formed by an operational amplifier or the like, and includes a DC component in a predetermined level range. Is input to the control unit 6 as a monitor signal of the low-frequency signal.

The control unit 6 detects, shapes and amplifies a monitor signal obtained by detecting, shaping, and amplifying a signal of a reflected wave by the reference signal transmitted from the base station S at predetermined time intervals during operation of the base station S.
A comparing means for inputting and monitoring from the monitoring means M, and comparing the monitoring result at the time of installation and the like with data stored in the storage unit 7 described later, and is constituted by, for example, a one-chip microcomputer. The control unit 6 receives the monitor signal output from the DC amplifying unit 5 via an AD converter and stores it as storage data in a storage unit 7 described later by a predetermined operation. Calculation of an abnormality determination reference value based on the stored data for determining an antenna abnormality is performed.

The storage unit 7 is a level storage for storing, as level storage data, the results of monitoring the reflected wave signals of the state where the antenna A is connected to the base station S and the state where the antenna A is disconnected by the monitoring means M. The control means 6 is built in a one-chip microcomputer of the control unit 6. And the storage unit 7
Based on a predetermined processing procedure of the control unit 6, the monitoring result is stored when the base station S is installed, and the stored data is transmitted from the base station S at predetermined time intervals when the base station S is operated. This is compared with the monitor signal level based on the reference signal.

Next, a procedure and an operation for detecting an antenna abnormality in the base station S by the above-described antenna abnormality detection device 1 will be described.

When the base station S is started up at the time of construction, a construction worker connects a transmission output terminal T1 which is a connection portion with a connection cable C such as a coaxial cable, and an antenna terminal T2 of the antenna A. State and antenna A
Is disconnected from the base station S toward the antenna A as a reference signal in a predetermined frequency band, for example, a sine wave signal of a predetermined magnitude in a 1.9 GHz frequency band. The signal is sent out and the reflected wave signal is monitored by the monitoring means M.

In the monitoring means M, a reflected wave signal having substantially the same frequency as the reference signal is received by the circulating unit 2 as a monitor signal, and is input to the detection unit 3 first. Then, the reflected wave signal, whose magnitude gradually changes, is converted into a DC signal containing a slowly changing component by the detection unit 3 and input to the waveform shaping unit 4. Then, the signal is converted into a low-frequency signal containing a DC component by the waveform shaping unit 4, and this low-frequency signal is converted into a DC signal which is an output terminal of the monitor unit M.
The signal is DC-amplified by the amplifier 5 and output to the controller 6. The monitor signal is AD-converted by the control unit 6 and, according to a predetermined operation of the construction worker, the data of the monitor signal is transmitted in a state where the base station S and the antenna A are connected by the connection cable C and the antenna terminal of the antenna A. The level storage data of the storage unit 7 is stored as level storage data indicating that the connection of T2 is disconnected.

The base station S transmits the reference signal at a time interval of, for example, every 24 hours during operation, the reflected wave signal is monitored by the monitoring means M, and the monitor signal is input to the control unit 6. Then, the control unit 5 compares the monitor signal with an abnormality determination reference value based on the stored data in the storage unit 7 and considering an actual output loss due to the connection cable C, and detects an antenna abnormality.

According to the antenna abnormality detection apparatus 1 and the antenna abnormality detection method of the embodiment described above, when the monitor unit M transmits the reference signal in the predetermined frequency band to the antenna A connected to the base station S, The signal level of the reflected wave is monitored, and the level storage unit of the storage unit 6 monitors the antenna A connected to the base station S by the connection cable C by the monitoring unit M and disconnects the connection cable on the antenna A side. The state of the base station S is monitored, and the signal level of the reflected wave by the reference signal transmitted from the base station S at predetermined time intervals during operation of the base station S is monitored by the control unit 6. The measured value of the loss between the transmission output terminal T1 and the antenna terminal T2 of the antenna A because the data is compared with the stored data. By taken into account, it can be reliably antenna failure detection against fluctuations installation state and type of, such as the length of the connecting cable C. Further, since the monitoring means M receives the reference signal transmitted from the base station S, outputs the reference signal to the antenna A, inputs the signal of the reflected wave from the antenna A, and outputs the signal to the control unit 6. Therefore, a special circuit for generating the reference signal is not required, and the cost can be reduced.

[Second Embodiment] FIG. 2 is a circuit diagram of an antenna abnormality detecting apparatus according to a second embodiment.

This antenna abnormality detection apparatus differs from the first embodiment in the point that it has a plurality of antennas and the method of detecting the antenna abnormality, and the components are the same as those in the first embodiment. .

This radio apparatus is a base station S of the same PHS telephone system as that of the first embodiment and is a diversity system for covering a communication area out of line of sight. Two antennas A and A are used. Antenna. Then, the antenna abnormality detecting device 1
In order to monitor a reflected wave signal when a reference signal in a predetermined frequency band is transmitted to the antennas A and A, the circulating unit 2, the detecting unit 3, the waveform shaping unit 4, and the DC
And two amplifying units 5.

The storage unit 7 stores the antennas A, A by the monitor unit M based on a predetermined processing procedure of the control unit 6.
A time storage means for accumulating and storing time used for selecting and using the result of monitoring the signal level of the received wave within a predetermined time when A is connected to the base station S by the connection cables C, C Form. Further, the control unit 6 monitors the signal level of the received wave received by the base station S at predetermined time intervals during operation of the base station S, and compares the signal level with the time storage data.

Next, a procedure and an operation for detecting an antenna abnormality in the base station S by the above-described antenna abnormality detection apparatus 1 will be described.

When the base station S is started during construction, the transmission output terminal T1 and the antenna terminal T2 of the antenna A are connected to a connection cable C such as a coaxial cable by a predetermined operation of a construction worker. The connection cable C is set in a predetermined connection state, and the antennas A, A select and use the result from monitoring the signal level of the received wave within a predetermined time, and accumulate the time used, and store the accumulated time as time storage data.

The base station S is generally programmed as an antenna diversity algorithm so as to select an antenna having a higher reception level when receiving with two antennas A and A. As a result, if one of the two antennas A, A becomes abnormal, only the other antenna is used. Accordingly, the control unit 6 accumulates the time at which each of the antennas A, A is selected and used at predetermined time intervals during the operation of the base station S, and compares the accumulated result data with the time storage data. This detects an antenna abnormality.

According to the antenna abnormality detecting apparatus 1 and the antenna abnormality detecting method of the embodiment described above, the signal level of the received wave received by the antennas A, A connected to the base station S is monitored by the monitoring means M, When the antenna is connected to the base station S by the connection cable by the monitor means M by the time storage means, the signal level of the received wave within a predetermined time during the predetermined time is selected from the monitored result and the time used is accumulated. The signal level of the received wave received by the base station S at predetermined time intervals during operation of the base station S is monitored by the control unit 6 and compared with the time storage data. The abnormality is always detected, and the antenna abnormality is detected earlier. Also, the monitor means M
However, since the reference signal transmitted from the base station S is input and output to the antennas A and A, the signal of the reflected wave from the antennas A and A is input and output to the control unit 6, A special circuit for generating the reference signal is not required, and the cost can be reduced.

[Third Embodiment] FIG. 2 is a circuit configuration diagram of an antenna abnormality detecting device according to a third embodiment.

This antenna abnormality detecting apparatus differs from the second embodiment in the method of detecting the antenna abnormality, and the components are the same as those of the second embodiment.

The storage unit 7 stores the antennas A and A by the monitor unit M based on a predetermined processing procedure of the control unit 6.
A level storage means for storing a signal level for monitoring a state in which A is connected to the base station S by a connection cable and a state in which the antenna A is disconnected from the connection cable on the A side; A, A is formed from a result of monitoring the signal level of a received wave within a predetermined time when A is connected to the base station S by a connection cable, and a time storage means for accumulating and storing a time used is formed. I do. The control unit 6 monitors the signal level of the received wave received by the base station S at predetermined time intervals during operation of the base station S, compares the signal level with the time storage data, and sends the reference signal from the base station S to the reference signal. To monitor the signal level of the reflected wave and compare it with the level storage data.

Next, a procedure and an operation for detecting an antenna abnormality in the base station S by the above-described antenna abnormality detection device 1 will be described.

When the base station S is started up at the time of construction, a predetermined frequency band is transmitted from the base station S to each antenna A connected to the base station S by a connection cable C by a predetermined operation of a construction worker. When the reference signal is transmitted, the signal levels of the reflected waves in a state where the antenna A is connected to the base station S by the connection cable C and a state where the connection on the antenna A side is disconnected are monitored. The monitoring results are stored in advance as level storage data, and the signal levels of the received waves from the respective antennas A are monitored respectively, and the selected and used times are accumulated within a predetermined time, and the accumulated results are also stored in time. It is stored in advance as data.

The base station S uses an antenna diversity algorithm as in the second embodiment,
It is programmed to select the antenna with the higher reception level when receiving with the two antennas A, A. As a result, if one of the two antennas A, A becomes abnormal, only the other antenna is used. Therefore, the control unit 6 determines that the base station S
During operation of each antenna A is selected for each predetermined time interval, the time used is accumulated, the data of this accumulation result is compared with the time storage data, the unused antenna is detected, A reference signal is transmitted from the base station S to the unused antenna A, the signal level of the reflected wave is monitored, and the monitored result data is compared with the level storage data to detect an antenna abnormality. Is done.

According to the antenna abnormality detecting apparatus 1 and the antenna abnormality detecting method of the embodiment described above, the reference signal of the predetermined frequency band is transmitted to the antennas A, A connected to the base station S by the monitoring means M. The signal level of the reflected wave and the signal level of the received wave received by the antennas A and A are monitored when the antennas A and A are connected to the radio apparatus by the connection cable by the monitoring means M by the level storage means. A signal level for monitoring that the connection with the connection cable on the antenna side is disconnected is stored, and a predetermined time when the antenna is connected to the base station S by the connection cable by the monitoring means M by the time storage means is stored. The time used is selected and monitored from the result of monitoring the signal level of the received wave within the time of 6, the signal level of the received wave received by the base station S at predetermined time intervals during operation of the base station S is monitored, compared with the time storage data, and a reference signal is transmitted from the base station S. Since the signal level of the reflected wave is monitored and compared with the level storage data, the antenna abnormality detection is always performed, and the measured value of the loss between the transmission output terminal T1 and the antenna terminal T2 of the antenna A is measured. Is taken into consideration, it is possible to reliably detect an antenna abnormality at an early stage even if the installation state and the type of the connection cable C change. Further, the monitoring means M inputs the reference signal transmitted from the base station S, outputs the reference signal to the antenna A,
Since the signal of the reflected wave is input and output to the control unit 6, a special circuit for generating the reference signal is not required, and the cost can be reduced.

In the description of the above embodiment,
Although the number of antennas connected to the wireless device has been described as two, the present invention is not limited to this.
For example, a plurality other than two, such as four, may be used.
Further, the comparison means is not limited to one using a CPU such as a one-chip microcomputer, but may be one that performs an operation or the like by analog signal processing.

[0043]

According to the antenna abnormality detecting apparatus and method according to the first and second aspects, when a reference signal of a predetermined frequency band is transmitted to one or more antennas connected to a radio apparatus by a monitor means. The signal level of the reflected wave is monitored, and the level storage means monitors the signal level by the monitoring means to monitor the state in which the antenna is connected to the wireless device by the connection cable and the state in which the connection to the antenna side connection cable is disconnected. Since the signal level of the reflected wave by the reference signal transmitted from the wireless device at predetermined time intervals during operation of the wireless device is monitored by the comparing means and compared with the level storage data, the connection cable The antenna abnormality can be reliably detected even when the installation state and the type of the antenna vary.

According to the antenna abnormality detecting device and method according to the third and fourth aspects, the signal level of the received wave received by one or more antennas connected to the radio apparatus is monitored by the monitoring means, and the monitoring is performed by the time storage means. The signal level of the received wave within a predetermined time when the antenna is connected to the wireless device by the connection cable by the means is selected from the monitored result, the time used is accumulated and stored, and the comparing means During operation of the wireless device, the signal level of the received wave received by the wireless device at a predetermined time interval is monitored and compared with the time storage data, so that the antenna abnormality detection is always performed. Thus, the antenna abnormality is detected earlier.

According to the antenna abnormality detecting device and method according to the fifth and sixth aspects, the reflected wave when the monitor means transmits a reference signal of a predetermined frequency band to one or more antennas connected to the wireless device. And the signal level of the received wave received by the antenna is monitored, and the level storage means disconnects the connection between the antenna and the connection cable on the antenna side when the antenna is connected to the wireless device by the connection cable by the monitoring means. A signal level monitored during the predetermined time when the antenna is connected to the wireless device by the connection cable by the monitoring means by the time storage means. Choose from,
The time used is accumulated and stored, and the signal level of the received wave received by the wireless device is monitored at predetermined time intervals during operation of the wireless device by the comparing means, and the time is compared with the time storage data to make a wireless communication. Since the reference signal is sent from the device and the signal level of the reflected wave is monitored and compared with the level storage data, the antenna abnormality is always detected, and the antenna abnormality is detected at an early stage. Variations in the installation state and type such as the length of C can be reliably detected.

According to the antenna abnormality detecting device of the present invention, in addition to the effects of the first, third or fifth aspect, the monitoring means inputs a reference signal transmitted from the circulating unit radio device to the antenna. Therefore, a signal of a reflected wave from the antenna is input and output to the comparing means, so that a special circuit for generating a reference signal is not required, and cost reduction is achieved.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of an antenna abnormality detection device according to a first embodiment of the present invention.

FIG. 2 is a circuit configuration diagram of an antenna abnormality detection device according to a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 abnormality detection device 2 circulation unit 6 control unit (comparison unit) 7 storage unit (level storage unit, time storage unit) M monitoring unit A antenna S base station (wireless device)

Claims (7)

[Claims] 1. An antenna abnormality detection device for a wireless device, comprising: a signal of a reflected wave when a reference signal in a predetermined frequency band is transmitted from the wireless device to one or more antennas connected to the wireless device. Monitoring means for monitoring the level, and a level for storing a signal level for monitoring a state in which the antenna is connected to the radio apparatus by a connection cable and a state in which the antenna is disconnected from the connection cable on the antenna side by the monitor means Storage means, and comparison means for monitoring a signal level of a reflected wave by the reference signal transmitted from the wireless device at predetermined time intervals during operation of the wireless device and comparing the signal level with the level storage data. An antenna abnormality detection device characterized by the above-mentioned. 2. An antenna abnormality detection method for a wireless device, comprising: transmitting a reference signal in a predetermined frequency band from a wireless device to an antenna connected to the wireless device by a connection cable; The signal levels of the reflected waves in the state where the radio apparatus is connected to the radio apparatus by the cable and the state where the connection on the antenna side is disconnected are respectively monitored, and this monitoring result is stored in advance as level storage data, and when the radio apparatus is operated. Sending the reference signal at predetermined time intervals to monitor the signal level of the reflected wave,
An antenna abnormality detection method, wherein an antenna abnormality is detected by comparing data of the monitoring result with the level storage data. 3. An antenna abnormality detection device for a wireless device, comprising: a monitor for monitoring a signal level of a received wave received by one or more antennas connected to the wireless device; Time storage means for accumulating and storing the time used for selection and monitoring from the result of monitoring the signal level of the received wave within a predetermined time when the apparatus is connected to the apparatus by a connection cable; and And a comparing means for monitoring the signal level of the received wave received by the wireless device at the time interval and comparing the signal level with the time storage data. 4. A method for detecting an abnormality in an antenna of a wireless device, wherein a signal level of a received wave from each antenna connected to the wireless device by a connection cable is monitored and selected and used within a predetermined time. The time is accumulated, the accumulation result is stored in advance as time storage data, and the time when each antenna is selected and used at predetermined time intervals during operation of the wireless device is accumulated, and the data of the accumulation result and the time are accumulated. An antenna abnormality detection method, wherein an antenna abnormality is detected by comparing stored data. 5. An antenna abnormality detection device for a wireless device, comprising: a signal of a reflected wave when a reference signal of a predetermined frequency band is transmitted from the wireless device to one or more antennas connected to the wireless device. Monitoring means for monitoring the level and the signal level of the received wave received by the antenna; and a state in which the antenna is connected to the wireless device by a connection cable by the monitor means, and the connection cable between the antenna and the antenna is disconnected. Level storage means for storing a signal level for monitoring the state, and a result of monitoring the signal level of the received wave within a predetermined time when the antenna is connected to the wireless device by a connection cable by the monitor means Time storage means for accumulating and storing time selected and used from the wireless device, and the wireless device operates at predetermined time intervals during operation of the wireless device. Comparing means for monitoring the signal level of a received wave to be received and comparing with the time storage data, and transmitting the reference signal from the wireless device to monitor the signal level of the reflected wave and to compare with the level storage data And an antenna abnormality detecting device. 6. A method for detecting an antenna abnormality in a wireless device, comprising: transmitting a reference signal in a predetermined frequency band from a wireless device to each antenna connected to the wireless device by a connection cable; Monitor the signal level of the reflected wave in a state where the wireless device is connected to the wireless device by a connection cable and in a state where the connection on the antenna side is disconnected, and store the monitoring result in advance as level storage data, Monitor the signal level of the received wave from each of them, and accumulate the time used for selection and use within a predetermined time, preliminarily store this accumulation result as time storage data, and at predetermined time intervals during operation of the wireless device. The time when each antenna is selected and used is accumulated, and the data of the accumulated result is compared with the time storage data. To detect an unused antenna, transmit the reference signal from the wireless device toward the antenna, monitor the signal level of the reflected wave, and compare the data of the monitoring result with the level storage data. An antenna abnormality detection method characterized by detecting an antenna abnormality. 7. The monitor means inputs the reference signal transmitted from the wireless device, outputs the reference signal to the antenna, and inputs a signal of a reflected wave from the antenna and outputs the signal to the comparison means. The antenna abnormality detecting device according to any one of claims 1, 3, and 5, further comprising a circulating unit for obtaining the antenna.