JP2738626B2 - Radar jammer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radar interfering device for transmitting an interfering wave and interfering with another radar.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing a conventional radar jammer. In the figure, reference numeral 1 denotes a high-frequency signal (hereinafter referred to as RF) which is a radar wave transmitted from a counterpart radar to be obstructed.
And a reception processor 2 for measuring and processing the RF signal received by the reception antenna 1. Reference numeral 3 denotes a modulator for modulating an interference signal based on the processing result of the reception processor 2, reference numeral 4 denotes a transmitter for amplifying the modulated interference signal, and reference numeral 5 denotes an interference signal from the transmitter 4 as an interference wave. This is a transmitting antenna to be transmitted to space.

Next, the operation will be described. Receive antenna 1
The RF signal received from the other radar from the other radar is sent to the reception processor 2 and measured, and radar specifications such as frequency, pulse width, pulse repetition frequency, and azimuth are detected. The reception processor 2 processes the detected radar data to generate interference data, and outputs it to the modulator 3. The modulator 3 generates an interference signal by a modulation operation based on the interference specifications received from the reception processor 2. The interfering signal generated by the modulator 3 is amplified by the transmitter 4 and sent to the transmitting antenna 5, where it is radiated and transmitted into space as an interfering wave. When this interfering wave is transmitted for a certain period of time, the transmission of the interfering wave is temporarily stopped in order to track the radar wave from the target radar to be intercepted, and then the transmission of the interfering wave by the above-described process is restarted. . By repeatedly performing the above operation, interference with the other radar is continued while tracking radar waves.

[0004] Incidentally, as literatures describing techniques related to such a conventional radar jammer, for example, JP-A-2-38883, JP-A-2-73182,
JP-A-3-77089 is an example.

[0005]

Since the conventional radar jammer is constructed as described above, it is necessary to suspend the sending of the jammer for tracking the radar wave, and during that period, it is necessary to suspend the transmission to the other radar. Not only does the blocking effect disappear,
Since the incident direction of the interfering wave can be easily detected in the other radar, it is possible to reduce the antenna gain in that direction, suppress interference due to the interfering wave, and reduce the interfering effect. there were.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can track a radar wave from a partner radar without stopping the transmission of an interfering wave.
It is an object of the present invention to obtain a radar jammer that prevents a decrease in the jamming effect by causing a partner radar to erroneously detect the incident direction of the jamming wave.

[0007]

According to a first aspect of the present invention, there is provided a radar interfering apparatus which generates and detects a synchronization signal synchronized with an interfering signal in addition to the function of a conventional radar interfering apparatus. And a plurality of jammers with an antenna for transmitting and receiving the synchronization signal are prepared, and by transmitting and receiving the synchronization signal via the antenna, the jammer is alternately transmitted by each jammer. .

[0008] The radar jamming device according to the second aspect of the present invention is one in which the jamming waves alternately transmitted from the jammers are overlapped for a certain period.

[0010] In the radar interfering device according to the third aspect of the present invention, the interfering waves transmitted by each interfering machine have a level difference.

[0010]

According to the first aspect of the present invention, each jammer transmits and receives a synchronizing signal and alternately sends out a jamming wave, while one of the jamming machines interferes with the other radar while the other jammer tracks the radar wave. As a result, it is possible to track radar waves from the other radar without stopping the transmission of interfering waves, and it is difficult to detect the incident azimuth with interfering waves transmitted alternately from different positions. To prevent

Each of the jammers according to the second aspect of the present invention overlaps the transmission period of the jamming wave with each other, so that the input level of the jamming wave on the partner radar side fluctuates with time, and This makes detection of the incident azimuth more difficult.

The respective jammers according to the third aspect of the present invention make the transmission level of the jamming signal different from each other, thereby changing the direction of the other party's radar by turning on / off the jammer, thereby reducing the jamming effect. To be higher.

[0013]

【Example】

Embodiment 1 FIG. Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the invention described in claim 1. In the figure, 1a and 1b are reception antennas, 2a and 2b are reception processors, 3a and 3b are modulators,
Reference numerals a and 4b denote transmitters, and reference numerals 5a and 5b denote transmission antennas, which are the same as or corresponding to those in the related art with reference numerals corresponding to FIG.

Reference numerals 6a and 6b denote data link processors for generating and detecting a synchronization signal synchronized with the interference signal, and reference numerals 7a and 7b denote antennas for transmitting and receiving the synchronization signal. 8a and 8b are respectively the reception antenna 1a
Or 1b, a reception processor 2a or 2b, a modulator 3a or 3b, a transmitter 4a or 4b, a transmission antenna 5a or 5b, a data link processor 6a or 6b, and an antenna 7a or 7b, and the antennas 7a and 7b. The transmission and reception of the synchronization signal through the transmission antenna 5a
Or a plurality of jammers that alternately send jammers from 5b.

Next, the operation will be described. In the radar jammer configured as described above, the jammers 8a, 8
On the other hand, in the jammer 8a, for example, the interfering device 8a generates the interfering data from the radar data detected from the RF signal of the other radar received by the receiving antenna 1a in the reception processor 2a and outputs the generated data to the modulator 3a. In 3a, an interference signal is generated by a modulation operation based on the interference specifications. This interference signal is amplified by the transmitter 4a, sent to the transmission antenna 5a, and sent out to space as an interference wave. When this interference wave is transmitted for a certain period, the transmission of the interference signal is stopped for a certain period in order to track the radar wave from the partner radar, and then the transmission of the interference wave is restarted in the above-described process. The data link processor 6a detects the start and stop of transmission of the interference wave and creates a synchronization signal. This synchronization signal is transmitted from the antenna 7a to the other jammer 8b.

On the other hand, in the jammer 8b, similar to the jammer 8a, the radar specifications are detected, the jammers based on the radar specifications are set, and the transmission of the interference wave is prepared. The synchronizing signal transmitted from the jammer 8a is the antenna 7
b, the output instruction of the interference signal synchronized with the jammer 8a is output to the modulator 3b by the data link processor 6b that has detected the signal. The interfering signal generated by the modulator 3b receiving the output instruction is sent to the transmitter 4b, amplified, and sent out from the transmitting antenna 5b to the space as an interfering wave.

FIG. 2 is a timing chart showing the time relationship between the interference wave output of each of the jammers 8a and 8b and the interference wave input on the partner radar side. FIG. 2 (a) shows the interference wave output of the jammer 8a. (B) shows the interference wave output of the jammer 8b, and (c) shows the input level of the interference wave on the partner radar side.
In this manner, the jammers 8a and 8b always operate complementarily, and while one of them is tracking a radar wave from the other radar, the other is transmitting the interference wave to the other radar. . Therefore, a constant level of the interfering wave is always input to the opponent radar which is the object of the interfering, and the interfering effect can be exerted continuously without interruption.

Embodiment 2 FIG. In the first embodiment, the case where the jammers 8a and 8b alternately transmit the interference waves has been described. However, the transmission of the respective interference waves may be overlapped for a certain period. FIG. 3 shows each jammer 8 in one embodiment of such an invention described in claim 2.
FIGS. 8A and 8B are timing charts showing the time relationship between the interference wave output of a and 8b and the interference wave input of the other party's radar.
Represents the jammer output of the jammer 8a, (b) shows the jammer output of the jammer 8b, and (c) shows the input level of the jammer on the partner radar side. During the period in which the transmission of the interfering waves is overlapped by the interfering devices 8a and 8a, the input level of the interfering waves increases as shown in FIG. 3 (c). Further, it becomes easy to make an error, and it becomes difficult to suppress the interference wave, and the interference effect becomes more reliable.

Embodiment 3 FIG. Further, in the first embodiment, the case where the transmission levels of the interference waves transmitted by the jammers 8a and 8b are the same has been described. However, interference waves having different transmission levels may be transmitted. In the radar jamming device according to the third aspect of the present invention, the transmission levels of the jamming waves of the jammer 8a and the jammer 8b are made different from each other and applied to the tracking radar at the timing shown in FIG. For example, if the jammer with the higher transmission level is turned off, the other radar will face the jammer with the lower transmission level, and if the jammer with the next higher transmission level is turned on, the other radar will interfere with the higher transmission level. It will be facing the aircraft and exerts an effective jamming effect on radar such as missiles.

[0020]

As described above, according to the first aspect of the present invention, a synchronizing signal is transmitted and received between a plurality of jammers and an interfering wave is transmitted alternately, and one of the jammers has a counterpart radar. While tracking the radar wave from the other radar, the other jammer is configured to transmit the interference wave to the other radar, so the radar wave from the other radar is tracked without interrupting the interference to the other radar In addition, since the interfering waves are alternately transmitted from different interfering devices, it is difficult to detect the azimuth of the interfering waves, so that a radar interfering device having a high interfering effect can be obtained.

According to the second aspect of the present invention, since the transmission periods of the interference waves are configured to overlap, it is possible to temporally vary the input level of the interference wave on the partner radar side. Thus, there is an effect that a radar jammer having a higher jamming effect can be obtained.

According to the third aspect of the present invention, since the interference signals having different transmission levels are used, the direction of the other party's radar can be changed by turning on / off the jammer. There is an effect that a highly effective radar jammer can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a timing chart showing a time relationship between an interference wave output of each jammer and an interference wave input on the partner radar side in the embodiment.

FIG. 3 is a timing chart showing a time relationship between an interference wave output of each jammer and an interference wave input on the partner radar side in the second embodiment of the present invention.

FIG. 4 is a block diagram showing a conventional radar jammer.

[Explanation of symbols]

 1a, 1b Receive antenna 2a. 2b Reception processor 3a, 3b Modulator 4a, 4b Transmitter 5a, 5b Transmission antenna 6a, 6b Data link processor 7a, 7b Antenna 8a, 8b Jammer

Claims (3)

(57) [Claims] 1. A respectively, to process receiving antennas for receiving the radar waves from the other radar interference target, it detects the radar specifications of the radar wave received by the receiving antenna,
A reception processor that generates interference specifications, a modulator that modulates an interference signal based on the interference specifications from the reception processor, a transmitter that amplifies the interference signal output from the modulator, A transmission antenna for transmitting a disturbing signal to the space as a disturbing signal, a data link processor for creating a synchronous signal synchronized with the disturbing signal, detecting the received synchronous signal, and an antenna for transmitting and receiving the synchronous signal. A radar jammer comprising: a plurality of jammers that alternately transmit jammers from the transmitting antenna by transmitting / receiving a synchronization signal via the antenna. 2. The radar jammer according to claim 1, wherein the jammers transmitted alternately by the plurality of jammers are overlapped for a certain period of time. 3. The radar jammer according to claim 1, wherein the plurality of jammers have a difference in transmission level of the jamming wave to be sent out.