JPH07181246A - Radar - Google Patents

Abstract

PURPOSE:To lengthen a signal detection time, improve detection probability of an object, and make object tracking easy in a radar having a function for eliminating transmission signals of near radars and reflection signals transmitted from an object. CONSTITUTION:Correlation processing of receiving signals input to a correlation processor 3 is performed every sweep of near radars 61-6n. Since transmission signals 8 of the near radars and reflection signals 9 transmitted from an object out of the receiving signals are synchroningly produced, correlation is taken every sweep. On the other hand, since the signal which the object emits has no connection with the transmission of the near radars, the correlation is not taken. A correlation processor 3 outputs the signals whose correlation is not taken in correlation processing of the receiving signals and the transmission signals of the near radars and the reflection signals from the object are eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio wave detecting apparatus having a function of removing a transmission signal of an adjacent radar and a reflection signal based on this transmission signal.

[0002]

2. Description of the Related Art Conventionally, this type of radio wave detection apparatus removes the transmission signal 8 of the adjacent radar and the reflection signal 9 from the target by utilizing the transmission trigger from the adjacent radar.

FIG. 3 shows John Wiley & Son.
s, Inc. Published by "MICROWAVE
RECEIVERS WITH ELECTRONI
C WARFARE APPLICATIONS ”3
It is a block diagram which shows an example of the conventional radio wave detection device of this kind published on the page, and the timing of the signal of each part is shown in FIGS. Here, adjacent radars 61 to 6n
Among them, it is assumed that only the radar indicated by reference numeral 61 is transmitting radio waves. The antenna 1 receives a radio wave propagating in space. The receiver 2 receives the radio wave received by the antenna 1,
Measure the frequency, pulse width, reception level, etc. of received radio waves. The signal processor 4 processes the measurement data output from the receiver 2 and displays the processing result on the display unit 5. The adjacent radar 61 outputs the transmission trigger 7 to the signal processor 4.

Next, the operation will be described. The signal processor 4 extends the transmission trigger 7 input from the adjacent radar 61 to a pulse width required to remove the transmission signal 8 of the adjacent radar and the reflection signal 9 from the target, and the blanking pulse 11
Is generated and the blanking pulse 11 is output to the receiver 2. The receiver 2 performs blanking processing in which the signal received during the input blanking pulse 11 is regarded as the transmission signal 8 of the adjacent radar or the reflection signal 9 from the target and is discarded.

As a result, the reception signal d from which the transmission signal 8 of the adjacent radar and the reflection signal 9 from the target are removed is output to the signal processor 4. The signal b in FIG. 4 represents a reception signal obtained by the receiver 2 when the blanking process is not performed.

[0006] As another conventional technique, Japanese Patent Laid-Open No. 2-1
There is an interference wave removing device for a radar receiving device described in 16772. This device uses a correlator to remove interfering waves.

[0007]

The conventional radio wave detecting apparatus shown in FIG. 3 uses the blanking pulse 11 which is the pulse width of the transmission trigger 7 of the adjacent radar extended to detect the transmission signal 8 of the adjacent radar and the target. Since the reflected signal 9 of is removed, the time for receiving and discarding the signal becomes long. That is, since the signal detection time is shortened, the detection probability of the signal emitted by the target is lowered, and the target tracking becomes difficult.

Further, the device described in Japanese Patent Laid-Open No. 2-116772 cannot eliminate the interference caused by the adjacent radar.

[0009]

In order to solve the above-mentioned problems, the means provided by the present invention is installed adjacent to a radar, receives a radio wave, and transmits a transmission signal of the adjacent radar and this transmission signal. In the radio wave detection device that processes the received radio wave while removing the reflected signal based on, and detects the target emitting the radio wave, the antenna that receives the radio wave and the frequency, pulse width, and reception related to the radio wave received by this antenna A receiver for measuring at least one of the levels, etc.,
A correlation processor that removes the transmission signal of the adjacent radar and the reflection signal based on this transmission signal by correlating the measurement data output from the receiver for each sweep of the adjacent radar based on the transmission trigger from the adjacent radar. , A signal processor that processes the measurement data output from the correlation processor to generate target data that emits radio waves, and a display that displays the data processed by the signal processor Is a radio wave detection device.

[0010]

The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a radio wave detection apparatus showing an embodiment of the present invention, and FIGS. 2A to 2D are diagrams showing signal timings of respective parts of the embodiment. In FIG. 1, the antenna 1
Receives incoming radio waves. The receiver 2 measures the frequency, pulse width, reception level, etc. regarding the radio wave received by the antenna 1, and sends the measurement data to the correlation processor 3. The adjacent radars 61 to 6n send the transmission trigger 7 of FIG. 2a to the correlation processor 3. The correlation processor 3 performs the correlation processing of the measurement data using the transmission trigger 7 from the adjacent radars 61 to 6n, and outputs the uncorrelated data to the signal processor 4. The signal processor 4 processes the data sent from the correlation processor 3 and sends target data for radiating radio waves to the display device 5, and the display device 5 displays the data.

Next, the operation of the radio wave detection apparatus of FIG. 1 will be described. Here, it is assumed that, of the adjacent radars 61 to 6n, only the radar indicated by reference numeral 61 emits radio waves. The signal received by the antenna 1 and measured by the receiver 2 comprises the transmitted signal 8 of the adjacent radar and the reflected signal 9 from the target based on this transmitted signal and the signal 10 emitted by the target, as shown in FIG. 2b. And is input to the correlation processor 3. The correlation processor 3 is internally provided with a memory circuit for storing the output signal of the receiver 2 shown in FIG. 2B for one cycle of the transmission trigger 7. Now, when the transmission trigger 7 output from the adjacent radar 61 is input to the correlation processor 3, the correlation processor 3 sends one sweep of the adjacent radar, that is, the next transmission, to the actual received signal as shown in FIG. 2c. A signal delayed by the time T until the trigger is read from the internal storage circuit of the correlation processor 3. Next, the correlation processor 3 correlates the actual received signal with the signal delayed by the sweep time T of the adjacent radar. The transmission signal 8 of the adjacent radar and the reflected signal 9 from the target based on this transmission signal 8 are generated in synchronization with the transmission timing of the radar, while the signal 10 emitted by the target is independent of the transmission timing of the adjacent radar. is there. Therefore, the correlation processor 3 performs a correlation process on the received signal and rejects a correlation signal,
The signal of FIG. 2d can be obtained by removing the transmitted signal 8 of the adjacent radar and the reflected signal 9 from the target from the received signal. The signal shown in FIG. 2d is processed by the signal processor 4, and only the target that truly emits the radio wave is detected.

[0012]

As described above, the radio wave detecting apparatus of the present invention removes the transmission signal of the adjacent radar and the reflection signal from this transmission signal target by taking the correlation between the reception signals for each adjacent sweep. Therefore, the signal can be detected for a long time as compared with the conventional device of FIG.

Therefore, by detecting the radio wave by the device of the present invention, the detection probability of the radio wave emitted by the target is improved,
When the device of the present invention is applied to the target tracking device, the target can be tracked more easily than when the conventional device is used.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a radio wave detection device according to the present invention.

FIG. 2 is a timing diagram (a) of a transmission trigger 7 output from adjacent radar devices 61 to 6n, timing diagrams (b) and (b) of a reception signal received by a receiver 2, and one signal of the adjacent radar is swept. (C) is a timing chart of signals shifted by the time T, and (d) is a timing chart showing signals that are not correlated due to the correlation between the signals of (b) and the signals of (c).
Is.

FIG. 3 is a block diagram showing a configuration of a conventional radio wave detection device.

FIG. 4 is a timing diagram (a) of a transmission trigger 7 output from adjacent radar devices 61 to 6n, a timing diagram (b) of a reception signal received by a receiver 2, and a blanking pulse 11 generated by the transmission trigger 7. 2C is a timing diagram of FIG. 3C and a timing diagram of signals remaining after the blanking process.

[Explanation of symbols]

 1 Antenna 2 Receiver 3 Correlation Processor 4 Signal Processor 5 Display 7 Adjacent Radar Transmission Trigger 8 Adjacent Radar Transmission Signal 9 Reflected Signal from Target 10 Target Emitted Signal 11 Blanking Pulse 61 to 6n Adjacent Radar

Claims (2)

[Claims] 1. A target which is installed adjacent to a radar, receives radio waves, processes received radio waves while removing a transmission signal of an adjacent radar and a reflected signal based on the transmission signal, and emits radio waves to a target. In a radio wave detection device for detection, an antenna for receiving radio waves, a receiver for measuring at least one of frequency, pulse width, reception level, etc. related to the radio waves received by this antenna, and a transmission trigger from an adjacent radar are also included. And a correlation processor that removes the transmission signal of the adjacent radar and the reflection signal based on this transmission signal by correlating the measurement data output from the receiver for each sweep of the adjacent radar, and output from this correlation processing device. A signal processor that processes the measured data and generates target data that emits radio waves, and a display that displays the data processed by the signal processor Radiolocation apparatus comprising: a. 2. The correlation processor comprises a storage circuit for storing measurement data of the output of the receiver for one sweep time T of the adjacent radar, and the measurement data output from the receiver and the storage circuit. 2. The radio wave detection apparatus according to claim 1, wherein correlation processing is performed with the measurement data read one sweep time before, and the data that is not correlated by the correlation processing is output to the signal processor. .