JPH04147080A - Radar operation monitor - Google Patents

Abstract

PURPOSE:To monitor operation of an entire radar system without being influenced by external factors by using a transmission leakage signal which is always generated at the time of transmission as an operation monitoring signal and by detecting the level. CONSTITUTION:A transmission leakage wave 1 of a constant level is included in a received signal during normal operation of respective transmitter and receiver systems. The received signal input as a receiver output video signal 6 is A/D-converted 7, then only a leakage wave 2 is taken out in a gate circuit 11, it is averaged by an average processing circuit 12 and it becomes a signal at a stable level. The signal is subjected to determination as to whether or not it is at a defined level in a comparison and determination circuit 13, and if it is out of the defined range, an alarm output 14 is generated to have radar operation monitoring performed. Thus an additional monitor signal is not generated, the method is simplified and an actual state of operation in radar transmission/reception can be monitored with fidelity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a condition monitoring device for stable operation of a radar device.

[Conventional technology]

FIGS. 4 and 5 show a monitoring method of a conventional radar operation monitoring device. In the figure, 1 is the transmission pulse, 2 is the transmission leakage waveform, 3 is the reference signal, 4 is the noise, and 5 is the ground signal.
Shows clutter.

Next, the operation will be explained. For the transmission pulse 1 sent from the transmitter, the receiver transmits transmission leakage wave 2 and noise 4.
etc. is output. In such conventional radar equipment,
To monitor its operation, methods have been used, such as adding a reference signal 3 to the receiver and detecting ground clutter 5 contained in the received signal. In the former case, the reference signal 3 is applied at the receiver when the input signal is a high frequency signal,
In this method, this level is checked during the process of digital processing where the signal is applied, and the presence or absence of fluctuations in the receiver level is detected.

The latter is a method in which the reception level of ground clutter 5, which appears almost fixedly in the reception signal, is assumed to be constant, digital processing is performed, and the presence or absence of radar operation and level fluctuation is checked.

[Problem to be solved by the invention]

Conventional radar operation monitoring equipment is configured as described above, and the method shown in Figure 4 adds a reference signal at the receiving stage, so there is a problem that it cannot monitor the radar operation of the entire system including the transmitting system. There was a point.

Furthermore, the method shown in FIG. 5 has a problem in that the level of ground clutter included in the received signal varies greatly depending on the season, wind speed, etc., and therefore does not allow for precise operation monitoring.

This invention has been made to solve the above-mentioned problems, and aims to provide a device that can monitor the operation of the entire radar system without being affected by external influences such as seasonal fluctuations.

[Means to solve the problem]

The radar operation monitoring device according to the present invention monitors radar operation by sampling transmission pulses or transmission leakage waves leaking into a receiver.

[Operation] In the present invention, since the receiving system is provided with a means for detecting the level of transmission leakage, the operating state of the entire radar transmitting and receiving system can be easily monitored during normal radar operation.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a circuit block configuration of a radar operation monitoring device according to an embodiment of the present invention. In the figure, 6 is a receiver output video signal, 7 is an A/D conversion circuit, 8 is a ground clutter removal circuit, 9 is various signal processing circuits, 10 is a video output, 11 is a gate circuit, and 12 is an averaging processing circuit. , 13 is a comparison/judgment circuit, and 14 is an alarm output. Note that in FIG. 1, the operation monitoring device to which the present invention is applied is a receiver output video signal 6. A/D conversion circuit 7. Gate circuit 11. Averaging processing circuit 12. This is the portion of the comparison/judgment circuit 13 and the alarm output 14.

Further, in FIG. 2, 1 is a transmission pulse, 2 is a transmission leakage wave, and 4 is a noise.

Next, the operation will be explained using FIGS. 1 and 2. In FIG. 2, if the transmitting and receiving stations are operating normally, a certain level of transmitted leakage waves 2 will be included in the received signal, regardless of the presence or absence of radar reflected signals. After A/D converting the received signal inputted as the receiver output video signal 6 into the circuit block of FIG. are averaged to obtain a stable level signal. Next, this signal is input to the comparison/judgment circuit 13 to determine whether it is at a specified level or not, and if it is outside the specified range, an alarm output 14 is generated to monitor the radar operation.

In this way, in this embodiment, instead of generating a new monitoring signal as a signal used for operation monitoring, a transmission leakage signal that always occurs during transmission is used, and its level is detected to monitor operation. This makes it possible to use a simple method and to faithfully monitor the actual status of radar transmission and reception operations.

Note that in the above embodiment, the receiver output video signal 6 is
Although the method of the digital circuit configuration is shown in which the digital signal passed through the D conversion circuit 7 is applied to the gate circuit 11,
A system may be adopted in which the receiver output video signal is directly applied to a gate circuit constituted by an analog switch without performing A/D conversion, and the same effect as in the above embodiment can be achieved.

Further, in the embodiment shown in FIG. 1 above, a single receiver output video signal is shown, whereas in another embodiment of the present invention shown in FIG. The signals are inputted in parallel to the attenuator 16 and applied to the circuit of the above embodiment at the same time through a plurality of channels. This makes it possible to check the overall operation of the entire transmitting and receiving system, including fluctuations at each level within the dynamic range of the receiver.

In addition, in the same figure, 15 is a received signal, 16 is an attenuator,
17 is a receiver, 18 is a gate judgment circuit consisting of the gate circuit 11, averaging processing circuit 12, and comparison judgment circuit 13 shown in FIG. 1, 19 is a reference monitor output, and 20 is an attenuation monitor output.

〔Effect of the invention〕

As described above, according to the radar operation monitoring device according to the present invention, instead of generating a new monitoring signal as a signal used for operation monitoring, a transmission leakage signal that always occurs during transmission is used. Since a means for detecting the level is provided, it is a simple method and has the effect of faithfully monitoring the actual operation status of the entire radar transmission and reception system.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a radar operation monitoring device according to an embodiment of the present invention, FIG. 2 is a waveform diagram showing a monitoring method of the radar operation monitoring device according to an embodiment of the present invention, and FIG. 3 is a diagram showing another embodiment of the present invention. Figures 4 and 5 showing radar operation monitoring equipment according to examples.
The figure is a diagram showing a monitoring method of a conventional radar operation monitoring device. In the figure, 1 is a transmission pulse, 2 is a transmission leakage wave, and 4 is a transmission pulse.
is noise, 6 is a receiver output video signal, 7 is an A/D conversion circuit, 8 is a ground clutter removal circuit, 9 is various signal processing circuits, IO is a video output, 11 is a gate circuit, 12
1 is an averaging processing circuit, 13 is a comparison judgment circuit, 14 is an alarm output, 15 is a received signal, 16 is an attenuator, I7 is a receiver, 18 is a gate judgment circuit, 19 is a reference monitor output, 2
0 is the decay monitor output. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) A radar operation monitoring device that monitors whether the transmission level and reception level of the pulse radar are kept constant, comprising means for detecting leakage signals of radar transmission waves in the reception system, and from the detection means. A radar operation monitoring device comprising means for detecting a leakage level of output radar transmission waves.