JP2865079B2 - Pulse radar receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for receiving a plurality of reception pulse trains in a reception radar wave.
The present invention relates to a pulse radar receiver that determines whether or not different transmission modes are used in the same radar.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing a configuration of a conventional pulse radar receiver. In the example of FIG. 4, a received signal of a radar wave received by an antenna 1 of a parabolic type or the like is input to a receiver 2, and here, for each received pulse, radio wave characteristics such as a frequency, a pulse width, an amplitude, and a pulse arrival time. Is measured. The pulse repetition interval (PR
I: Pulse Repitition Interval) is detected by the PRI detector 3. With this received pulse train as one target, the target tracking processing and the like are continued.

Next, when a radar wave of a different mode is received, since the radio wave specifications before and after the reception are different, the radar wave is recognized as a different target. For this reason, the radio wave data of the received pulse train before and after the mode change is compared with the data stored in the database 5 by the correlation processor 4, and the correlation processing is performed, and the transmission radar wave of the same radar apparatus in different transmission modes is performed. Is determined (reception pulse train), and the data is output.

As a conventional example of such a pulse radar receiving apparatus, a "signal receiving apparatus" disclosed in Japanese Patent Application Laid-Open No. 3-76432 is known. In this conventional example, the band reception interval and reception time are calculated from the PRI data of the target signal set in the radio source identification table for each band, and the reception band is switched according to the target signal that changes for each operation. ing.

[0005]

However, in the above-described conventional pulse radar receiving apparatus, the received pulse trains before and after the mode change are subjected to a correlation process for determining whether or not the same radar apparatus is in a different transmission mode. A database is required, and in this database, it is necessary to store a huge amount of radio wave data of the reception pulse train to be received. In this case, there is a disadvantage that the device scale and the data processing scale increase. The example of the publication also requires a radio source identification table as a database, and it is conceivable that the scale of the apparatus and the scale of data processing are increased.

The present invention solves such a problem in the prior art, and calculates a pulse width and a duty ratio of a pulse repetition interval with a simple configuration, and calculates a pulse width and a duty cycle of a pulse repetition interval. Provided is a pulse radar receiving apparatus that can accurately determine whether a received pulse train is in a different transmission mode in the same radar apparatus and can suppress an increase in apparatus scale and data processing scale.

[0007]

According to a first aspect of the present invention, there is provided a pulse radar receiving apparatus comprising: an antenna for receiving a radar wave; and a frequency of a reception pulse train obtained by processing a signal received from the antenna. Receiving means for measuring radio wave parameters including pulse width, amplitude and pulse arrival time,
PRI detection means for detecting a pulse repetition interval from a pulse arrival time measured by a reception means, and duty ratio detection means for detecting a duty ratio between a pulse width in an output of the reception means and a pulse repetition interval detected by the PRI detection means. Determining whether or not each of the plurality of received pulse trains is in a different transmission mode in the same radar apparatus based on the pulse repetition interval detected by the PRI detecting means and the duty ratio detected by the duty ratio detecting means. And a correlation processing means for performing a correlation process for performing the correlation processing.

According to a second aspect of the present invention, there is provided a pulse radar receiving apparatus comprising:
Antenna for receiving radar waves, receiving means for measuring radio wave parameters including frequency, pulse width, amplitude and pulse arrival time of a received pulse train processed from a signal received from the antenna, and azimuth for detecting azimuth due to rotation of the antenna Azimuth detecting means for outputting a detection signal to the receiving means, azimuth separating means for separating and outputting pulse data from the receiving means for each azimuth indicated by the azimuth detection signal detected by the azimuth detecting means, PRI detection means for detecting a pulse repetition interval from a pulse arrival time for each direction, and duty ratio detection means for detecting a duty ratio for each direction between a pulse width in an output of the reception means and a pulse repetition interval detected by the PRI detection means And the pulse repetition interval detected by the PRI detection means and the duty ratio detected by the duty ratio detection means. There are, each received pulse train of a plurality of received pulse train for each orientation, is configured to include a correlation process means for performing correlation processing to determine whether different transmit modes whether on the same radar apparatus.

According to a third aspect of the present invention, there is provided a pulse radar receiving apparatus.
The correlation processing means is configured to compare the duty ratios of a plurality of reception pulse trains with a pulse repetition interval and determine that the plurality of reception pulse trains when the duty ratios are equal are different transmission modes in the same radar device.

According to a fourth aspect of the present invention, there is provided a pulse radar receiving apparatus.
The correlation processing means in the pulse radar receiver according to any one of claims 1, 2 and 3, further comprising a database storing radio wave data including a frequency, a pulse width, an amplitude and a pulse arrival time of a received pulse train. Using the stored data, each reception pulse train of the plurality of reception pulse trains,
It is configured to determine whether or not the transmission modes are different in the same radar device.

In the pulse radar receiving apparatus according to the first and third aspects of the present invention, based on the detected pulse repetition interval and the detected duty ratio, each of the plurality of received pulse trains has the same radar. Correlation processing is performed to determine whether or not the device is in a different transmission mode.

In this case, in the radar apparatus, the duty ratio between the pulse width and the pulse repetition interval in the transmission signal is limited due to restrictions on the operation of the transmitter. That is, the duty ratio differs depending on the radar device. Therefore, by detecting the duty ratio of the received pulse train and performing correlation processing of the duty ratio for each of the received pulse trains, it is determined whether each of the plurality of received pulse trains is in a different transmission mode in the same radar device. Judgment becomes possible.

In this manner, the pulse width and the duty ratio of the pulse repetition interval are calculated with a simple configuration, and the correlation processing determines whether each of the plurality of received pulse trains is in a different transmission mode in the same radar device. Can be determined, and an increase in the apparatus scale and data processing scale can be suppressed.

According to a second aspect of the present invention, there is provided a pulse radar receiving apparatus, wherein a plurality of reception pulse trains of a plurality of reception pulse trains for each azimuth are identical based on a pulse repetition interval detected for each azimuth and a detected duty ratio. A correlation process is performed to determine whether or not the transmission mode is different in the radar device. Also in this case, with a simple configuration, it is possible to reliably determine whether each of the plurality of reception pulse trains for each direction is in a different transmission mode in the same radar device, and to reduce the device scale and data processing scale. Increase can be suppressed.

According to a fourth aspect of the present invention, there is provided a pulse radar receiving apparatus.
In addition to the determination using the duty ratio according to any one of claims 1 to 3, the reception pulse trains of the plurality of reception pulse trains are in different transmission modes in the same radar device depending on the radio wave data stored in the database. Is determined. In this case, the detection accuracy is further improved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a pulse radar receiving apparatus according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a pulse radar receiving apparatus according to a first embodiment of the present invention. In FIG. 1, this example receives a radar wave and receives an antenna 11 such as a parabolic antenna.
And a receiver 12 for measuring radio wave parameters including a frequency, a pulse width, an amplitude and a pulse arrival time of a reception pulse train obtained by processing a reception signal from the antenna 11.

A PRI for detecting a pulse repetition interval (PRI) from a pulse arrival time measured by the receiver 12.
Detector 13, pulse width and PRI output from receiver 12
Pulse repetition interval (PRI) detected by detector 13
Duty ratio detector 14 for detecting the duty ratio with
And the pulse repetition interval (PRI) detected by the PRI detector 13 and the duty ratio detected by the duty ratio detector 14, the received pulse trains of the plurality of received pulse trains are transmitted differently by the same radar device. And a correlation processor 15 for performing a correlation process for determining whether or not the mode is set.

Next, the operation of the first embodiment will be described. In FIG. 1, a radar wave is received by an antenna 11, and the received signal is input to a receiver 12. The receiver 12 processes the received signal and measures radio wave parameters such as frequency, pulse width, amplitude, and pulse arrival time for each received pulse train. The pulse data S6 measured by the receiver 12
Is input to the PRI detector 13.

In the PRI detector 13, the pulse data S6
From pulse arrival time to pulse repetition interval at
The I data S7 is detected. The pulse data S6 and P
The RI data S7 is input to the duty ratio detector 14,
Here, the duty ratio between the pulse width of the pulse data S6 from the receiver 12 and the pulse repetition interval of the PRI data S7 from the PRI detector 13 is detected, and this duty ratio data S8 is output.

The duty ratio data S8 and the PRI data S7 from the PRI detector 13 are input to the correlation processor 15. The correlation processor 15 performs a correlation process based on the PRI data S7 and the duty ratio data S8 to determine whether each of the plurality of reception pulse trains is in a different transmission mode in the same radar device, The output data is sent.

The determination in this case utilizes the fact that the duty ratio of the pulse width and the pulse repetition interval in the transmission signal is limited due to the restriction of the operation of the transmitter. That is, the duty ratio of the pulse in the pulse data S6 of the received pulse train A from the receiver 12 to the pulse repetition interval (PRI) in the PRI data S7 from the PRI detector 13 differs depending on the radar device. Therefore, by detecting the duty ratio of the received pulse train, and by correlating the duty ratio of each received pulse train, it is possible to determine whether each of the plurality of received pulse trains is in a different transmission mode in the same radar device. become.

FIG. 2 is a diagram for explaining the detection state of the duty ratio by the duty ratio detector 14 in the first embodiment. In FIG. 2A, the duty ratio detector 14 detects the pulse width TWA of the pulse data S6 of the received pulse train A from the receiver 12 and the pulse repetition interval (PR) of the PRI data S7 from the PRI detector 13.
I) Detect the duty ratio (TWA / TiA) with TiA.
Here, the duty ratio (TWA / TiA) is detected as 25%, and the duty ratio data S8 is output to the correlation processor 15.

In FIG. 2B, the duty ratio detector 14 determines the pulse width TWA of the pulse data S6 of the pulse train B received from the receiver 12 and the PRI detector 1
The duty ratio (TWA / TiA) of the pulse repetition interval (PRI) TiA in the PRI data S7 from No. 3 is detected. Here, it is detected that the duty ratio (TWA / TiA) is 25%, and the duty ratio data S8 is output to the correlation processor 15.

In FIG. 2C, the duty ratio detector 14 detects the pulse width TWC of the pulse data S6 of the pulse train C received from the receiver 12 and the PRI detector 1
The duty cycle ( TWC / TiC ) of the pulse repetition interval (PRI) TiC in the PRI data S7 from No. 3 is detected. Here, it is detected that the duty ratio ( TWC / TiC ) is 12.5%, and the duty ratio data S8 is output to the correlation processor 15.

The correlation processor 15 compares the duty ratio data S8 of the plurality of received pulse trains A, B, and C with the PRI data S7, and when the duty ratios are equal, that is, FIGS. 2A and 2B. The received pulse trains A and B shown in
It is determined that each of the plurality of reception pulse trains is in a different transmission mode in the same radar device.

As described above, in the first embodiment, the correlation processing for determining that each of the plurality of reception pulse trains is in a different transmission mode in the same radar apparatus is performed. As described above, a database having a large device scale and a large data processing scale for determination is not required. That is, the pulse width and the duty ratio of the pulse repetition interval are calculated with a simple configuration, and the correlation processing makes it possible to accurately determine whether each of the plurality of received pulse trains is in a different transmission mode in the same radar device. Will be able to As a result, it is possible to suppress an increase in the device scale and the data processing scale.

FIG. 3 is a block diagram showing a configuration in the second embodiment. The second embodiment shown in FIG. 3 includes, in addition to the configuration of the first embodiment shown in FIG. 1, an azimuth detector 17 that outputs an azimuth detection signal obtained by detecting an azimuth due to rotation of the antenna 11 to the receiver 12. I have. An azimuth separator 18 is provided for outputting pulse data S9 obtained by separating pulse data S6 from the receiver 12 to the PRI detector 13 for each azimuth of the azimuth detection signal detected by the azimuth detector 17.

Next, the operation of the second embodiment will be described. The second embodiment of FIG. 3 operates in the same manner as the first embodiment shown in FIG.
The azimuth detection signal that detects the azimuth due to rotation of the receiver 1
2 is input. Also, for each azimuth of the azimuth detection signal detected by the azimuth detector 17, the pulse data S9 obtained by separating the pulse data S6 from the receiver 12 by the azimuth separator 18 into P
Output to the RI detector 13.

Then, the PRI detector 13, the duty ratio detector 14, and the correlation processor 15 detect the duty ratio between the pulse width and the pulse repetition interval for each azimuth and perform a correlation process. It is determined whether the received pulse trains are in different transmission modes in the same radar device.

Also in the second embodiment, it is possible to accurately determine whether or not each of a plurality of reception pulse trains of each direction of the antenna 11 is in a different transmission mode in the same radar device. An increase in the scale and the data processing scale can be suppressed.

A database 20 may be connected to the correlation processor 15 of the first and second embodiments in the same manner as in the conventional example shown in FIG. That is, together with the determination using the duty ratio, it is possible to determine whether or not each of the plurality of reception pulse trains is in a different transmission mode in the same radar device based on the radio wave specification data stored in the database 20. become able to do. In this case, the detection accuracy is further improved.

[0032]

As is clear from the above description, the pulse radar receiving apparatus according to the first and third aspects of the present invention is based on the detected pulse repetition interval and the detected duty ratio.
It is determined whether or not each of the plurality of reception pulse trains is in a different transmission mode in the same radar device. That is, the radar apparatus utilizes the fact that the duty ratio between the pulse width and the pulse repetition interval in the transmission signal is limited due to the restriction of the operation of the transmitter and that the duty ratio is different, and the duty ratio of the reception pulse train is changed. By detecting and correlating the duty ratio of each of the received pulse trains, it is determined whether or not each of the plurality of received pulse trains is in a different transmission mode in the same radar device.

As a result, the pulse width and the duty ratio of the pulse repetition interval are calculated with a simple configuration, and it is reliably determined whether each of the plurality of received pulse trains is in a different transmission mode in the same radar device. Becomes possible,
The increase in the apparatus scale and the data processing scale can be suppressed.

According to a second aspect of the present invention, there is provided a pulse radar receiving apparatus, wherein the plurality of reception pulse trains for each direction have the same reception pulse train based on the pulse repetition interval detected for each direction and the detected duty ratio. A correlation process is performed to determine whether or not the transmission mode is different in the radar device.

Also in this case, with a simple configuration, it is possible to reliably determine whether or not each of the plurality of reception pulse trains for each azimuth is in a different transmission mode in the same radar device. An increase in the processing scale can be suppressed.

According to a fourth aspect of the present invention, there is provided a pulse radar receiving apparatus comprising:
Along with the determination using the duty ratio, the respective reception pulse trains of the plurality of reception pulse trains can also be used to determine whether or not the transmission modes are different in the same radar device based on the radio wave specification data stored in the database. The detection accuracy is further improved.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a pulse radar receiving apparatus according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining a calculation state of a duty ratio in a duty ratio detector according to the first embodiment.

FIG. 3 is a block diagram illustrating a configuration of a pulse radar receiving apparatus according to a second embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a conventional pulse radar receiver.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Antenna 12 Receiver 13 PRI detector 14 Duty ratio detector 15 Correlator 17 Direction detector 18 Direction separator 20 Database S6 Pulse data S7 PRI data S8 Duty ratio data S9 Pulse data

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-96887 (JP, A) JP-A-8-129059 (JP, A) JP-A-9-264946 (JP, A) 2685 (JP, A) JP-A-55-1546 (JP, A) JP-A-10-82850 (JP, A) JP-A-61-155973 (JP, A) JP-A-3-76432 (JP, A) 60-21973 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) G01S 7/00-7/42 G01S 13/00-13/95

Claims (4)

(57) [Claims] 1. An antenna for receiving a radar wave, a receiving unit for measuring radio wave parameters including a frequency, a pulse width, an amplitude and a pulse arrival time of a reception pulse train obtained by processing a reception signal from the antenna, and the reception unit PRI detection means for detecting a pulse repetition interval from the pulse arrival time measured in, a duty ratio detection means for detecting the duty ratio between the pulse width in the output of the receiving means and the pulse repetition interval detected by the PRI detection means Based on the pulse repetition interval detected by the PRI detection unit and the duty ratio detected by the duty ratio detection unit, determine whether each of the plurality of reception pulse trains is in a different transmission mode in the same radar device. And a correlation processing means for performing a correlation processing for determination. Communication apparatus. 2. An antenna for receiving a radar wave, receiving means for measuring radio wave characteristics including a frequency, a pulse width, an amplitude and a pulse arrival time of a reception pulse train obtained by processing a reception signal from the antenna; An azimuth detecting means for outputting an azimuth detection signal obtained by detecting an azimuth due to rotation to the receiving means; and separating and outputting pulse data from the receiving means for each azimuth indicated by the azimuth detection signal detected by the azimuth detecting means. Azimuth separation means, PRI detection means for detecting a pulse repetition interval from a pulse arrival time for each azimuth from the azimuth separation means, a pulse width at the output of the reception means and a pulse repetition interval detected by the PRI detection means Duty ratio detection means for detecting a duty ratio for each azimuth of
Using the pulse repetition interval detected by the RI detection means and the duty ratio detected by the duty ratio detection means, determine whether each reception pulse train of the plurality of reception pulse trains for each azimuth is in a different transmission mode in the same radar device. And a correlation processing means for performing a correlation process for determining the pulse radar receiving apparatus. 3. The correlation processing means compares a duty ratio of a plurality of reception pulse trains with a pulse repetition interval, and compares the plurality of reception pulse trains having the same duty ratio in different transmission modes in the same radar device. 3. The pulse radar receiving apparatus according to claim 1, wherein it is determined that there is a pulse radar. The correlation processing means in 4. Pulse radar receiver apparatus of claim 1, 2 or 3, wherein the received pulse train frequency, pulse width, a database storing a radio wave specifications of data including amplitude and pulse arrival time Using the data stored in the database, in accordance with the determination based on the duty ratio, determining whether each of the plurality of received pulse trains is in a different transmission mode in the same radar device. Pulse radar receiver.