JP2011106956A - Dme ground device and transmission method of distance information by dme ground device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the operation stop of a DME (distance measuring equipment) ground device by generating a transmission pulse of a normal answering signal, even if a CW (continuous wave) interfering waves that are not less than a predetermined signal level are input. <P>SOLUTION: A receiver 15 always monitors the signal level of a question signal for measurement, arriving from an aircraft (not shown) and received signal level of a diagnostic question signal generated by a question signal generating unit 18 for performing self diagnosis. When the CW interference waves arrive at the receiver 15, the signal level of the diagnostic question signal generated by the question signal generating unit 18 in a monitoring control device 17a is amplified by a variable amplifier 19, so that the signal level of the amplified diagnostic question signal is controlled to be higher than the signal level of the CW interfering wave. Consequently, even if the signal level of the CW interference waves become higher, a stable answering signal can be transmitted from a transmitter 16 to the aircraft through an antenna 11. Thus, the DME ground device 10a can continue to stably transmit distance measurement information to the aircraft. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a distance measuring device (DME: Distance Measuring Equipment) that measures a distance between an aircraft and a ground device installed on the ground side, and a distance information transmission method using DME, and in particular, provided on the ground side. The present invention relates to a DME ground device and a distance information transmission method by the DME ground device for transmitting distance information to an aircraft.

  A DME used for an aircraft includes a DME on-board device mounted on the aircraft and a DME ground device that communicates with the DME on-board device from the ground side. The DME on-board device is provided with an interrogator (interrogator), and the DME ground device is provided with a response device (transponder). In such a configuration, the interrogation device for the UHF band is transmitted from the interrogation device of the DME onboard device to the response device of the DEM ground device, and the response signal from the response device (the interrogation signal and the response signal are pair pulses). The distance between the aircraft and the DME ground unit is measured based on the time it takes for the interrogator to receive. That is, the DME onboard device of the aircraft measures the distance between the aircraft and the DME ground device based on the time interval from the time when the measurement interrogation signal is transmitted to the time when the corresponding response signal is received. Therefore, various measures are taken so that the signal exchanged between the interrogation device on the DME onboard device side and the response device on the DEM ground device side is not disturbed by a CW (Continuous Wave) interference wave or the like.

  For example, even if a low-level CW interference wave that is acceptable from the viewpoint of the operation of the DME ground device continues, the response device of the DEM ground device normally detects a measurement interrogation signal stronger than the CW interference wave and generates a response signal. A technique has been disclosed in which a distance measurement service can always be provided by enabling transmission (see, for example, Patent Document 1). Also, with this technology, even if there is a CW jamming wave having an unacceptable intensity for operation, if the CW jamming wave is within a predetermined time, the distance measurement service can be continuously provided without stopping the operation. ing.

  Further, the CW signal of the CW interference wave is canceled (removed) by adding a signal having an opposite phase to the CW signal of the CW interference wave mixed in the receiver of the DME ground device, and the DME ground device receives the measurement interrogation signal. A technique has also been disclosed in which a DME on-board device can accurately measure a distance by reliably receiving and transmitting a response signal (see, for example, Patent Document 2).

  Further, the receiver of the DME ground device controls (amplifies) the gain of the measurement interrogation signal in accordance with the noise level of the CW interference wave, so that the measurement interrogation signal having a signal level higher than the noise level of the CW interference wave is obtained. A technique for suppressing the component of the CW interference wave by receiving is also disclosed (see, for example, Patent Document 3). According to this technique, the receiver of the DME ground device can always receive the measurement interrogation signal having a signal level higher than the noise level of the CW interference wave, and can transmit a response signal to the DME on-board device. The DME ground device can always provide a normal distance measurement service to the DME onboard device.

JP 07-198839 A Japanese Patent Laid-Open No. 10-062520 JP 56-108982 A

  By the way, in order to perform a self-diagnosis, a normal DME ground device repeatedly generates a question signal for diagnosis at a fixed signal level by the monitoring control device and inputs it to the receiver, and outputs a response signal to the input question signal for diagnosis. While monitoring the transmission pulse, the operation status of the DME ground device is constantly monitored. In this case, if a CW interference wave having a signal level equal to or higher than that of the diagnostic interrogation signal is mixed from the outside, the receiver cannot receive a diagnostic interrogation signal having a normal signal level, and as a result, no response signal transmission pulse is generated. Therefore, the operation of the DME ground device stops (shuts down).

  This will be described in more detail with reference to FIG. 5, FIG. 6, and FIG. FIG. 5 is a block diagram showing a partial configuration of a conventional DME ground device. As shown in FIG. 5, the DME ground device 30 generates a fixed-level diagnostic question signal S38 at the question signal generator 38 in the monitoring control device 37 in order to perform self-diagnosis. The diagnostic interrogation signal S38 is guided to the receiver 35 by the duplexer 34 through the directional coupler 33.

  At this time, if the diagnostic interrogation signal S38 is determined by the receiver 35 to be an interrogation signal having a normal signal level, the response signal is transmitted by the transmitter 36 after the system delay time caused by the system of the DME ground device 30. The transmission pulse S36 is generated. The transmission pulse S36 passes through the directional coupler 33 due to the direction selection of the duplexer 34, and is further radiated from the antenna 31 to the DME onboard device (not shown) via the directional coupler 32. The At this time, a part of the transmission pulse S36 is input from the directional coupler 32 to the transmission pulse monitoring unit 40 in the monitoring control device 37 and is constantly monitored.

  FIG. 6 is an operation waveform diagram of each part when there is no CW interference wave in the DME ground device shown in FIG. 5, the horizontal axis indicates the time flow, and the vertical axis indicates the signal level. Therefore, the operation of the DME ground device 30 when there is no CW interference wave will be described using the operation waveform diagram of FIG.

  First, a diagnostic question signal S38 as shown in FIG. 6 (a) is generated in the question signal generator 38 of the monitoring control device 37. The diagnostic question signal S38 output from the question signal generator 38 is merged on the time axis with the measurement question signal for measuring the distance input from the antenna 31 by the directional coupler 33. That is, as shown in FIG. 6B, the diagnostic question signal S38 and the measurement question signal are input to the receiver 35 as reception signals. When the receiver 35 determines that the diagnostic question signal S38 has a normal signal level, the diagnostic question signal S38 is transmitted from the receiver 35 to the transmitter 36 as shown in FIG. 6C. Output as a receiver output signal.

  Further, after a system delay time T resulting from the system configuration of the DME ground device 30, a transmission pulse S36 of a response signal is generated by the transmitter 3, as shown in FIG. The transmission pulse S36 is radiated from the antenna 31 to the DME onboard device (not shown) via the duplexer 34, the directional coupler 33, and the directional coupler 32. Further, a part of the transmission pulse S 36 is input to the transmission pulse monitoring unit 40 in the monitoring control device 37. Then, the transmission pulse monitor unit 10 measures the time interval between the diagnostic question signal S38 and the transmission pulse S36, and when the transmission pulse S36 normally exists after the system delay time T, the diagnostic question signal S38 It is determined that the signal level is normal.

  Next, the operation of the DME ground device 30 when CW interference waves are present will be described. FIG. 7 is an operation waveform diagram of each part when the CW interference wave is present in the DME ground device shown in FIG. 5, where the horizontal axis indicates the time flow and the vertical axis indicates the signal level. Therefore, the operation of the DME ground device 30 when a CW interference wave is present will be described using the operation waveform diagram of FIG.

  As shown in FIG. 7A, when a diagnostic question signal S38 is generated in the question signal generator 38 of the monitoring controller 37, the diagnostic question signal S38 output from the question signal generator 38 is converted into a directional coupler. 33, the measurement interrogation signal inputted from the antenna 1 is merged on the time axis. That is, as shown in FIG. 7B, the diagnostic question signal S38 and the measurement question signal are input to the receiver 35 as reception signals.

  At this time, as shown in FIG. 7B, the signal level of the CW interference wave mixed from the antenna 31 is higher than the signal level of the diagnostic question signal S38. The question signal S38 cannot be processed as a question signal having a normal signal level. Therefore, as shown in FIG. 7C, the receiver 35 cannot output a receiver output signal based on the diagnostic question signal S38. Therefore, since the transmitter 36 cannot receive the receiver output signal from the receiver 35, the response signal transmission pulse S36 is transmitted from the transmitter 36 after the system delay time T as shown in FIG. Is not output. That is, since the transmission pulse S36 does not exist after the system delay time T with reference to the signal level of the diagnostic question signal S38, the monitoring control device 37 determines that the DME ground device 30 is in communication abnormality. If the communication abnormality state continues for a predetermined time or longer in this way, the DME ground device 30 stops operating. Therefore, the DME ground device 30 cannot provide a distance measurement service to the aircraft.

  Note that the technique of the above-mentioned Patent Document 1 correctly detects a measurement interrogation signal stronger than the CW jamming wave even if a low-level CW jamming wave that is allowable in the operation of the DME ground device continues, and generates a response signal. Although transmission is possible, operation of the DME ground device is stopped when an interference wave having an intensity unacceptable for operation is generated for a predetermined time or longer. Therefore, in this case, the DME ground device cannot provide a distance measurement service to the aircraft.

  Further, the technique disclosed in Patent Document 2 can remove the CW signal of the CW interference wave at a predetermined level, but the case where the CW interference wave is strong with respect to the measurement interrogation signal or the fluctuation of the CW interference wave is large. Makes it difficult to cancel the CW signal of the CW interference wave. Therefore, the DME ground device cannot input only the measurement interrogation signal from which the CW interference wave is removed. As a result, since a response signal cannot be transmitted from the DME ground device to the DME onboard device, distance measurement data cannot be communicated between the DME ground device and the DME onboard device.

  Furthermore, the technique of the above-mentioned Patent Document 3 controls (amplifies) the gain of the measurement interrogation signal in accordance with the noise level of the CW interference wave, so that the measurement interrogation signal having a signal level higher than the noise level of the CW interference wave To receive. However, this technique does not prevent the operation stop of the DME ground device by generating a diagnostic question signal higher than the noise level of the CW interference wave while performing self-diagnosis by the diagnostic question signal. That is, in this technique, the gain of the measurement interrogation signal is controlled so that the measurement interrogation signal arriving from the DME on-board device is higher than the noise level of the CW interference wave. Therefore, the signal level of the measurement interrogation signal is always higher than the noise level of the CW interference wave while comparing the measurement interrogation signals arriving at the DME ground device with the noise level of the CW interference wave each time. The gain must be controlled so that Therefore, the circuit configuration of the control system for controlling the gain of the measurement interrogation signal becomes complicated, and the cost of the DME ground device increases.

  The present invention has been made in view of the above-described circumstances, and even if a CW interference wave having a predetermined signal level or higher is input, it does not stop operation by generating a transmission pulse of a normal response signal. It is an object of the present invention to provide a DME ground device and a distance information transmission method using a DME ground device for transmitting distance information to an aircraft.

  In order to achieve the above object, according to a first aspect of the present invention, a response signal corresponding to a measurement interrogation signal for distance measurement received from an aircraft is installed on the ground and transmitted to the aircraft. A DME ground device for providing distance measurement information for measuring the distance to the ground to the aircraft, and a signal of a diagnostic question signal for performing self-diagnosis according to the signal level of the input CW interference wave It is characterized by comprising control means for controlling the level.

  In addition, the second configuration of the present invention is installed on the ground, transmits a response signal corresponding to the measurement interrogation signal for distance measurement received from the aircraft, and measures the distance between the aircraft and the ground. A distance information transmission method by a DME ground device for transmitting distance information to the aircraft, wherein the DME ground device for providing distance measurement information to the aircraft is a CW input to the DME ground device A control step for controlling the signal level of the diagnostic interrogation signal for performing self-diagnosis according to the signal level of the interference wave is characterized.

  According to the present invention, even if a CW interference wave having a predetermined signal level or higher is mixed in the input signal, the DME ground device can continue to provide distance measurement information to the aircraft without stopping operation. . The reason is as follows. That is, when the DME ground device constantly monitors the received signal level and determines that a CW jamming wave has arrived, the control means (variable amplifier) is used to control the signal level of the diagnostic interrogation signal. The signal level of the interrogation signal is raised above the signal level of the CW interference wave. As a result, even if the signal level of the CW interference wave suddenly increases, the signal level of the diagnostic interrogation signal becomes higher than that. Therefore, a response signal transmission pulse corresponding to the diagnostic interrogation signal is generated and transmitted to the aircraft. can do. Accordingly, the DME ground device can continue to provide distance measurement information to the aircraft without stopping operation.

It is a block diagram which shows the partial structure of the DME ground apparatus applied to Embodiment 1 of this invention. It is an operation | movement waveform diagram of each part when the CW disturbance wave in the DME ground apparatus shown in FIG. 1 exists. It is a block diagram which shows the partial structure of the DME ground apparatus applied to Embodiment 2 of this invention. It is a block diagram which shows the partial structure of the DME ground apparatus applied to Embodiment 3 of this invention. It is a block diagram which shows the partial structure of the conventional DME ground apparatus. FIG. 6 is an operation waveform diagram of each unit when there is no CW interference wave in the DME ground device shown in FIG. 5. FIG. 6 is an operation waveform diagram of each unit when a CW interference wave is present in the DME ground device shown in FIG. 5.

  The present invention is installed on the ground and transmits a response signal corresponding to the measurement interrogation signal for distance measurement received from the aircraft to the aircraft, and distance measurement information for measuring the distance between the aircraft and the ground is transmitted to the aircraft. A DME ground device to be provided, comprising control means for controlling the signal level of a diagnostic interrogation signal for performing self-diagnosis in accordance with the signal level of an input CW interference wave, thereby providing a predetermined signal level or higher Even if the CW interference wave is inputted, the purpose of preventing the DME ground device from being stopped by generating a normal response signal transmission pulse is realized.

Embodiment 1

  Hereinafter, a first embodiment of a DME ground device according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a partial configuration of a DME ground device applied to Embodiment 1 of the present invention. As shown in FIG. 1, the DME ground device 10a according to the present invention includes an antenna 11, directional couplers 12, 13, a duplexer 14, a receiver 15, a transmitter 16, and a monitoring control device 17a. Note that the monitoring control device 17a includes a question signal generation unit 18, a variable amplifier 19, and a transmission pulse monitoring unit 20.

  The antenna 11 receives a measurement interrogation signal for measuring a distance from a DME onboard device of an aircraft (not shown), and transmits a response signal corresponding to the received measurement interrogation signal to the DME onboard device. Antenna. The directional couplers 12 and 13 are coupling / distribution elements for coupling and distributing multiple signals (measurement interrogation signals, diagnostic interrogation signals, response signals, etc.). The duplexer 14 is a system switching element for switching systems of various signals such as a measurement question signal, a diagnostic question signal, and a response signal.

  The receiver 15 is an element having a function of receiving a measurement interrogation signal, a diagnostic interrogation signal, and a CW interference wave, and transmitting signal information corresponding to the reception level of those signals to the transmitter 16 and the variable amplifier 19. It is. The transmitter 16 is an element having a function of generating a response signal based on the signal information from the receiver 15 and transmitting the response signal to the DME onboard apparatus of the aircraft (not shown) via the antenna 11.

  The question signal generator 18 in the monitoring control device 17a is an element for generating a fixed-level diagnostic question signal so that the DME ground device 10a performs self-diagnosis. The variable amplifier 19 is an element having a function of controlling (amplifying) the signal level of the diagnostic interrogation signal in accordance with the signal level of the CW interference wave included in the signal information from the receiver 15. The transmission pulse monitoring unit 20 is a monitoring unit that extracts and monitors a part of a transmission pulse of a response signal transmitted from the transmitter 16 to the DME onboard device (not shown) via the antenna 11.

  In the DME ground apparatus 10a having such a configuration, the measurement interrogation signal received from the DME onboard apparatus of the aircraft received by the antenna 11 is guided to the receiver 15 by the duplexer 14 via the directional couplers 12 and 13. It is burned. When it is determined by the receiver 15 that the inquiry signal for measurement has a predetermined signal level, information to that effect is transmitted from the receiver 25 to the transmitter 26. Thereby, after the system delay time depending on the system of the DME ground device 1, the transmitter 16 generates the transmission pulse S16 of the response signal. Then, the transmission pulse S16 of the response signal is transmitted from the transmitter 16 to the duplexer 14. Further, the transmission system of the response signal transmission pulse S6 is selected by the duplexer 14, and the response signal transmission pulse S16 is radiated into the space from the antenna 11 via the directional couplers 13 and 12, and the DME machine of the aircraft (not shown) It is transmitted to the upper device.

  Further, the DME ground device 10a generates a fixed-level diagnostic question signal S18 in the question signal generation unit 18 in the monitoring control device 17a in order to perform self-diagnosis. Is amplified to a predetermined signal level, and is transmitted to the outside from the monitoring control device 7 as a diagnostic question signal S19 having a high signal level. That is, when the signal level of the diagnostic interrogation signal S18 generated by the interrogation signal generator 18 is lower than the signal level of the CW interference wave, the variable amplifier 19 amplifies the signal level higher than the signal level of the CW interference wave. The diagnostic question signal S19 is transmitted from the monitoring controller 17a to the outside. The diagnostic interrogation signal S19 is guided to the receiver 15 by the duplexer 14 via the directional coupler 313.

  In this way, when the receiver 15 determines that the diagnostic interrogation signal S19 input from the duplexer 14 to the receiver 15 is higher than the signal level of the CW interference wave, after the system delay time, The transmitter 16 generates a response signal transmission pulse S16. The transmission pulse S16 of the response signal passes through the directional coupler 13 by the direction selection of the duplexer 14, and further passes through the directional coupler 12 from the antenna 11 to the DME onboard apparatus (not shown) of the aircraft. While being radiated, a part of the transmission pulse S16 is input to the transmission pulse monitor unit 20 in the monitoring controller 17a and constantly monitored.

  Next, an operation when a CW interference wave is present in the DME ground device 10a shown in FIG. 1 will be described. FIG. 2 is an operation waveform diagram of each part when CW interference waves exist in the DME ground device shown in FIG. In order to perform self-diagnosis, the interference-resistant DME ground device 10a generates a question signal S18 for diagnosis in the question signal generator 18 in the monitoring control device 17a, and further sets the signal level to a predetermined level by the variable amplifier 19. Amplification is performed to generate a diagnostic question signal S19 as shown in FIG.

  Further, the amplified diagnostic question signal S19 is guided to the receiver 15 by the duplexer 14 via the directional coupler 13. On the other hand, the CW interference wave mixed in the measurement interrogation signal input from the antenna 11 is also input to the receiver 15 through the directional couplers 12 and 13 and the duplexer 14. As a result, as shown in FIG. 2B, the received signal input to the receiver 15 has a diagnosis question signal S19 and a measurement question signal arranged on the time axis and amplified by the variable amplifier 19. The signal level of the interrogation signal S19 is higher than the signal level of the CW interference wave. In FIG. 2B, part of the strong measurement interrogation signal from the aircraft is also higher than the signal level of the CW jamming wave.

  At this time, the receiver 15 constantly monitors the signal level (reception level) of the reception signal as shown in FIG. 2B and outputs the reception level to the variable amplifier 19. Therefore, when the signal level of the CW jamming wave further rises, the variable amplifier 19 becomes equal to or higher than the signal level of the raised CW jamming wave based on the information on the reception level of the CW jamming wave input from the receiver 16. The signal level of the diagnostic question signal S19 is increased.

  As a result, even if the signal level of the input CW jamming wave suddenly increases, the signal level of the diagnostic interrogation signal S19 is raised by the variable amplifier 19 from the signal level of the CW jamming wave. The question signal S19 can be determined as a question signal having a normal signal level. Therefore, the receiver 15 can transmit a receiver output signal as shown in FIG.

  In this way, when a receiver output signal as shown in FIG. 2C is transmitted from the receiver 15 to the transmitter 16, as shown in FIG. 2D, due to the system of the DME ground device 1 After the system delay time T, the transmitter 6 generates a response signal transmission pulse S16 corresponding to the diagnostic question signal S19, and outputs the response signal transmission pulse S16 to the duplexer 14. The response signal transmission pulse S16 passes from the duplexer 14 through the directional coupler 13, and is further radiated from the antenna 11 to the DME onboard device (not shown) via the directional coupler 12. A part of the transmission pulse S16 is input to the transmission pulse monitor unit 20 in the monitoring control device 17a and constantly monitored.

  As a result, the transmission pulse monitoring unit 20 measures the time interval between the diagnostic question signal S19 and the transmission pulse S16 of the response signal, and the transmission pulse S16 is normally transmitted after the system delay time T. 10a determines that it is operating normally. As a result, even if a CW interference wave having a predetermined signal level or higher is mixed in the measurement interrogation signal, the DME ground device 10a does not stop operation.

  That is, according to the DME ground apparatus 10a of the present invention, the receiver 15 constantly monitors the signal level of the received signal and the signal level of the CW interference wave as shown in FIG. Information is output to the variable amplifier 19. Thus, when the question signal generator 18 generates a diagnostic question signal S18 having a predetermined level in the monitoring control device 17a, the variable amplifier 19 uses the diagnostic question signal S18 based on the signal level information from the receiver 10a. And an amplification operation is performed so that the signal level of the diagnostic interrogation signal S19 output from the variable amplifier 19 is equal to or higher than the signal level of the CW interference wave.

  As a result, the receiver 15 can normally process (decode) the diagnostic interrogation signal S19 and transmit the receiver output signal as shown in FIG. 2C to the transmitter 16. After the delay time T, a normal transmission pulse S16 as shown in FIG. 2 (d) can be generated, and a response signal can be transmitted from the antenna 11 to the DME onboard apparatus of the aircraft not shown. As a result, the DME ground device 10a does not stop operation even when the signal level of the CW jamming wave increases, and can continue to provide distance measurement information to the DME onboard device of the aircraft.

  To summarize the above description, according to the interference-resistant DME ground device 10a according to the first embodiment of the present invention, the receiver 15 receives the signal level of the measurement interrogation signal coming from the aircraft (not shown). In addition, the reception signal level of the diagnostic question signal generated by the question signal generator 18 for self-diagnosis is constantly monitored. When it is determined that a CW interference wave has arrived at the receiver 15, the signal level of the diagnostic question signal generated by the question signal generator 18 of the monitoring controller 17a is amplified by the variable amplifier 19 and amplified. Control is performed so that the signal level of the diagnostic question signal S19 is higher than the signal level of the CW interference wave. Thereby, even if the signal level of the CW interference wave becomes high, a stable response signal can be transmitted from the transmitter 16 to the aircraft via the antenna 11. Therefore, the DME ground device 10a can continue to transmit the distance measurement information stably to the aircraft even when the signal level of the CW interference wave becomes high.

Embodiment 2

  In the DME ground device 10a of the first embodiment, the monitoring control device 17a is provided with a variable amplifier 19, and the variable amplifier 19 controls the signal level of the diagnostic question signal in accordance with the signal level of the CW interference wave, thereby making a diagnosis. The signal level of the interrogation signal is always higher than the signal level of the CW interference wave to prevent the operation of the DME ground device 10a from being stopped. Therefore, in the DME ground device of the second embodiment, in addition to the operation and effect of the DME ground device 10a of the first embodiment, a display unit for displaying the received signal level monitored by the receiver 15 is provided. The signal level of the CW interference wave mixed into the DME ground device from the outside can be confirmed visually.

  FIG. 3 is a block diagram showing a partial configuration of a DME ground device applied to Embodiment 2 of the present invention. That is, as shown in FIG. 3, the display unit 21 is provided in the monitoring control device 17b, and the signal level of the received signal monitored by the receiver 15 is displayed on the display unit 21. As a result, the signal level of the CW jamming wave mixed into the DME ground device 10b can be visually confirmed, and the volume of the variable amplifier 19 is manually adjusted while visually checking the signal level of the CW jamming wave. Can be adjusted so that the signal level of the diagnostic interrogation signal S19 is higher than the signal level of the CW interference wave. Since the components other than the added display unit 21 are the same as those in FIG.

Embodiment 3

  In the DME ground device of the third embodiment, in addition to the second embodiment, a specified level is set with respect to the signal level of the CW jamming wave monitored by the receiver 15, and the signal level of the CW jamming wave is set to the prescribed level. If it exceeds, an alarm or the like is generated and an alarm device for alerting the user is provided, so that constant monitoring is possible.

  FIG. 4 is a block diagram showing a partial configuration of a DME ground device applied to Embodiment 3 of the present invention. That is, as shown in FIG. 4, the monitoring control device 17 is further provided with an alarm device 22 in addition to the display unit 21. As a result, when the signal level of the CW interference wave exceeds the specified level, the alarm device 22 can be sounded to alert the user, so whether or not the DME ground device 10c is in an operational state at all times. It becomes possible to monitor.

  Although several embodiments of the DME ground device according to the present invention have been described in detail with reference to the drawings, the specific configuration of the DME ground device according to the present invention is limited to the above-described embodiments. However, even if there is a design change or the like within a range not departing from the gist of the present invention, they are included in the present invention. For example, in a DME ground device that does not have a self-diagnosis function, when the signal level of a CW jamming wave increases, the signal level of the measurement interrogation signal input from the antenna can be changed to be higher than the signal level of the CW jamming wave. Amplify with an amplifier. As a result, even if the signal level of the CW interference wave becomes high, the operation stop of the DME ground device can be avoided.

<Summary>
As described above, in order to perform self-diagnosis, a general DME ground device itself generates a fixed-level diagnostic question signal, the diagnostic question signal is normally received, and the corresponding response signal Whether or not a transmission pulse is generated is constantly monitored. Here, when a CW interference wave of a predetermined level or higher is mixed, a diagnostic interrogation signal cannot be received and a response signal transmission pulse is not generated, so that the operation of the DME ground device is stopped.

  Therefore, the DME ground device of the present invention constantly monitors the signal level of the mixed CW jamming wave, and when the signal level of the CW jamming wave becomes high, the signal level of the diagnostic interrogation signal is set to the signal level of the CW jamming wave. By making it higher than the level, the transmission pulse of the response signal is stably generated. As a result, the DME ground device can continue to provide stable distance measurement information to the aircraft without stopping operation.

  The DME ground device according to the present invention can prevent the operation stop of the DME ground device by controlling so that the signal level of the diagnostic interrogation signal is always higher than the signal level of the CW interference wave. It can be used effectively in other air traffic control facilities and air defense facilities of the Ministry of Defense.

10a, 10b, 10c, 30 DME ground device 11, 31 Antenna 12, 13, 32, 33 Directional coupler 14, 34 Duplexer 15, 35 Receiver (Receiving means)
16, 36 Transmitter (Transmission means)
17a, 17b, 17c, 37 Monitoring and control device 18, 38 Question signal generator (question signal generator)
19 Variable amplifier (control means)
20, 40 Transmission pulse monitor unit 21 Display unit (display means)
22 Alarm (alarm means)
S16, S36 Response signal transmission pulses S18, S38 Diagnostic question signal generated by the question signal generator 18 S19 Diagnostic question signal amplified by the variable amplifier 19

Claims (14)

A response signal corresponding to a measurement interrogation signal installed on the ground and received from the aircraft is transmitted to the aircraft, and distance measurement information for measuring the distance between the aircraft and the ground is provided to the aircraft. DME ground equipment that
A DME ground device comprising control means for controlling a signal level of a diagnostic interrogation signal for performing a self-diagnosis in accordance with a signal level of an inputted CW interference wave. A DME ground device that is installed on the ground and provides distance measurement information for measuring the distance between the aircraft and the ground to the aircraft,
Receiving means for receiving a measurement interrogation signal for distance measurement from the aircraft;
Transmitting means for generating a response signal corresponding to the measurement interrogation signal received by the receiving means, and transmitting the response signal to the aircraft;
Question signal generating means for generating a question signal for diagnosis for performing self-diagnosis;
A DME ground device comprising: control means for controlling the signal level of the diagnostic interrogation signal generated by the interrogation signal generation means in accordance with the signal level of the CW interference wave input to the reception means.   2. The DME ground device according to claim 1, wherein the control means performs an amplifying operation so that a signal level of the diagnostic interrogation signal is higher than a signal level of the CW interference wave. The receiving means transmits the signal level of the CW interference wave input to the receiving means in real time to the control means,
The control means performs amplification so that the signal level of the diagnostic question signal generated by the question signal generation means is higher than the signal level of the CW interference wave received in real time from the reception means. The DME ground device according to claim 2.   The said transmission means transmits a response signal to the said aircraft, when the signal level of the diagnostic interrogation signal amplified by the said control means is higher than the signal level of the said CW jamming wave. DME ground equipment.   6. The DME ground device according to claim 2, further comprising display means for displaying a signal level of the CW interference wave received by the receiving means.   7. The DME ground device according to claim 6, further comprising alarm means for generating an alarm when the signal level of the CW interference wave received by the receiving means is equal to or higher than a predetermined level set in advance. A response signal corresponding to a measurement interrogation signal installed on the ground and received from the aircraft is transmitted to the aircraft, and distance measurement information for measuring the distance between the aircraft and the ground is provided to the aircraft. A DME ground device is a distance information transmission method by a DME ground device for transmitting distance information to the aircraft,
Distance information transmission by the DME ground device, including a control step of controlling a signal level of a diagnostic interrogation signal for performing a self-diagnosis according to a signal level of a CW interference wave input to the DME ground device. Method. A distance information transmission method by a DME ground device, which is installed on the ground and provides distance measurement information for measuring the distance between the aircraft and the ground to the aircraft. Because
Receiving a measurement interrogation signal for distance measurement from the aircraft;
Generating a response signal corresponding to the measurement interrogation signal received in the receiving step, and transmitting the response signal to the aircraft;
A question signal generation step for generating a diagnostic question signal for performing self-diagnosis;
And a control step of controlling the signal level of the diagnostic interrogation signal generated in the interrogation signal generation step in accordance with the signal level of the CW interference wave input in the process of the reception step. Distance information transmission method by a device.   9. The distance information transmission method by a DME ground device according to claim 8, wherein in the control step, amplification is performed so that a signal level of the diagnostic interrogation signal is higher than a signal level of the CW interference wave. In the reception step, the signal level of the CW interference wave input to the DME ground device is monitored in real time,
In the control step, an amplification operation is performed so that the signal level of the diagnostic interrogation signal generated in the interrogation signal generation step is higher than the signal level of the CW interference wave monitored in the reception step. The distance information transmission method by the DME ground device according to claim 9.   The response signal is transmitted to the aircraft when the signal level of the diagnostic interrogation signal amplified in the control step is higher than the signal level of the CW interference wave in the transmission step. Distance information transmission method by DME ground device.   13. The distance information transmission method by the DME ground device according to claim 9, 11 or 12, further comprising a display step of displaying a signal level of the CW interference wave received in the reception step.   14. The distance information transmission by the DME ground device according to claim 13, further comprising an alarm step for generating an alarm when a signal level of the CW interference wave received in the reception step is equal to or higher than a predetermined level set in advance. Method.

Images