JP3348031B2 - Radar system - 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 system having an electronic jamming and anti-jamming function mounted on a mobile station such as an aircraft, a ship or a vehicle, or a station such as a fixed station on the ground.

[0002]

2. Description of the Related Art FIG.
FIG. 1 is a block diagram showing the configuration of a radar system mounted on an aircraft having a conventional anti-electromagnetic interference function disclosed in Japanese Patent Publication No. 00; Is an electronic search device as an electronic search means for analyzing the jammed radio wave when the radar operation of the radar 1 is interrupted; 3, a data bus connecting the radar 1 and the electronic search device 2; This is a jamming station on the other side that transmits jamming radio waves to the radar 1.

The radar 1 is provided with, for example, a phased array antenna 5 capable of scanning an electron beam in all directions. The phased array antenna 5 forms a transmission / reception beam having high directivity at a desired direction and at a desired timing. can do. This phased array antenna 5
Is connected to a frequency control means 6 for switching a transmission frequency for performing a radar operation, and forms a transmission / reception beam at a desired frequency to detect a target (not shown).

The electronic search device 2 includes a small antenna 7 for receiving jamming waves transmitted by the jamming station 4 and a search device 8 for analyzing jamming waves received by the small antenna. Analyzes the information of the jamming radio wave including the frequency and frequency distribution of the jamming radio wave, the arrival direction of the jamming radio wave (direction from the jamming station 4 to the radar 1), the received power, the pulse width, the repetition frequency, the time change of the frequency, and the like.

As shown in FIG. 17, the internal structure of the search device 8 will be described. 9 is a mixer circuit for inputting the jamming radio wave received by the small antenna 7 and converting it into an intermediate frequency jamming signal. A local signal generator 11 for generating a local signal mixed with the jammer in the mixer circuit 9;
Is a filter circuit for cutting off an unnecessary band from an intermediate frequency interference signal in the mixer circuit 9;
A detector for detecting a video signal from an output of the detector, 13 is an information processing device for analyzing information of a jamming radio wave from the video signal detected by the detector 12, and 14 is a frequency of the local signal generator 10 from an output of the detector 12. It is a control device for controlling.

[0006] The jamming radio wave received by the small antenna 7 of the search device 8 is mixed with the local signal of the local signal generator 10 by the mixer circuit 9 and converted into an intermediate frequency jamming signal. This interfering signal is transmitted to the filter circuit 1
The video signal is input to the detector 12 via 1 and is detected. This video signal is input to the information processing device 13, where the information of the jamming radio wave is analyzed. The information of the jamming radio wave is output to the data bus 3, and information such as the frequency and the direction of arrival of the jamming radio wave is transmitted to the radar 1.

The data bus 3 is a communication line connected by a cable for transmitting information on the jamming radio waves to the radar 1. The radar 1 receives information on jamming radio waves via the data bus 3. The radar 1 does not match the bandwidth of the jamming radio wave, switches the transmission frequency so as not to be interfered, performs a radar operation, and detects a target.

Next, the operation will be described. As a basic radar operation, the radar 1 controls the transmission frequency by the frequency control means 6.
The radar wave is transmitted from the phased array antenna 5 to the target. The radar radio wave is reflected by the target and received by the phased array antenna 5. The radar 1 detects the target by obtaining the distance and direction to the target from the received radar radio waves. Thus, the radar 1 detects the target.

The operation when the radar 1 receives jamming radio waves from the jamming station 4 will be described. When the radar 1 is performing the radar operation at the transmission frequency fr as shown in FIG. 18A, the radar 1 receives the jamming radio wave Z from the jamming station 4 as shown in FIG. This jamming radio wave Z has a frequency fr
Is centered and has a bandwidth B, so that the radar 1 cannot operate at the frequency fr. When the radar 1 is being disturbed by the jamming radio wave Z, as a countermeasure, the electronic search device 2 analyzes the frequency fr of the jamming radio wave, the direction of arrival, etc., and sends the information to the radar 1 via the data bus 3. The information of the jamming radio wave is received by the radar 1.

As shown in FIG. 18 (c), the radar 1
The transmission frequency fr is switched to a frequency fα that is not subject to interference so as not to match the bandwidth B of the jamming radio wave Z. Radar 1
Can perform radar operation at this frequency fα without being covered by the bandwidth B of the jamming radio wave Z.

Since the radar 1 uses the phased array antenna 5, it transmits radar waves having high directivity. When the radar 1 scans and transmits a radar wave in all directions, the radar wave is received by the jamming station 4, the transmission frequency is analyzed, and the radar wave is jammed. For this reason, radar waves are not transmitted in the direction of the jamming station 4.

[0012]

As shown in FIG. 19A, when the radar 1 is disturbed by the jamming station 4 with the jamming radio wave Z including the transmission frequency fr, as shown in FIG.
The radar 1 switches the transmission frequency fr to another frequency fα. However, conventionally, as shown in FIG. 19 (b), the jamming station 4 receives the radar radio wave of the radar 1 and analyzes the transmission frequency fα of the radar 1. The jamming station 4 generates a jamming radio wave K including the frequency fα to obstruct the radar operation of the radar 1. In this case, since the radar 1 is again obstructed, the radar 1 cannot perform a normal radar operation at the frequency fα. Then, as a countermeasure, as shown in FIG. 19C, the radar 1 switches the transmission frequency fα to another frequency fβ so as not to be disturbed. Then, again, this frequency fβ
Is analyzed, and an interfering radio wave that covers and interferes with the frequency fβ is generated. Furthermore, since the frequency control means 6 is set to the transmission frequency fβ after analyzing the frequency fβ which is not affected by interference, the operation of the system is slowed down.

As described above, conventionally, when the jamming station 4 is transmitting jamming radio waves, the jamming station 4 interferes with the jamming radio wave, and the radar 1 cannot perform a normal radar operation. Further, since the transmission frequency must always be set to another frequency so as to avoid the following from the frequency of the jamming radio wave on the jamming station 4 side, switching of jamming avoidance is complicated. Also, if there is a target in the direction from the radar 1 to the jamming station 4, if the radio wave is transmitted in the target direction, the radio wave of the normal radar operation will be known to the jamming station 4 on the other side. There was a problem that the transmission could not be performed and the target could not be found with the radar 1.

The present invention has been made to solve the above problems. When the jamming station is transmitting jamming radio waves, it is possible to perform a normal radar operation and always set the transmission frequency to another frequency. It is an object of the present invention to provide a radar system capable of performing a normal radar operation in which the switching operation is simple without performing the switching operation and enabling the radar to find a target in the direction of the interfering station.

[0015]

According to a first aspect of the present invention, there is provided a radar system for analyzing a radar for obtaining a target position, an azimuth, and the like by using a radio wave, and an interfering radio wave from an interfering station side to the radar. Electronic search means, and on the side of the jamming station,
A false radar radio wave which does not contribute to the normal radar operation is transmitted in accordance with the reception timing of the radio wave on the side of the jamming station.

According to a second aspect of the present invention, there is provided a radar system, comprising: detecting means for detecting a timing when the interfering station receives a radio wave from the radar and instructing to transmit the false radar radio wave. It is provided.

According to a third aspect of the present invention, when the radar receives the jamming radio wave, the radar system transmits a transmission frequency of a false radar wave included in a frequency band of the jamming radio wave from the radar. It performs regular radar operation at a frequency not included in the frequency band of the jamming radio wave.

According to a fourth aspect of the present invention, when the radar receives the interfering radio wave, the radar system transmits a transmission frequency of a false radar radio wave not included in the frequency band of the interfering radio wave, A normal radar operation is performed at a frequency included in the frequency band of the jamming radio wave.

In a radar system according to a fifth aspect of the present invention, the radar and the electronic search device are mounted on separate stations, respectively, and each station is provided with a data transmission device. Each station communicates the information of the jamming radio wave.

A radar system according to a sixth aspect of the present invention includes a dedicated electronic jamming device for transmitting a false radar wave to the jamming station.

In a radar system according to a seventh aspect of the present invention, the radar and the electronic search device are mounted in some stations, the electronic jamming device is mounted in another station, and data is stored in each station. A transmission device is provided for communicating the information of the jamming radio waves between the respective stations.

In a radar system according to the present invention, the radar, the electronic search device, and the electronic jamming device are provided in separate stations, and each station is provided with a data transmission device. , And communicates the information of the interfering radio waves between the respective stations.

In a radar system according to a ninth aspect of the present invention, the radar, the electronic search means, and the detection means are connected to each other, and a communication line for communicating information on the interfering radio waves is provided between the radar and the electronic search means. Things.

According to a tenth aspect of the present invention, in the radar system, the radar, the electronic search means, the detection means, and the electronic jamming device are connected to each other, and the information of the jamming radio waves is communicated between them. A communication line is provided.

[0025]

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

Embodiment 1 FIG. 1 is a block diagram showing a configuration of a radar system according to Embodiment 1 of the present invention, and the same components as those in FIG. In this case, the electronic search device 2 includes timing detection means 15 for detecting the timing when the jamming station 4 stops transmitting the jamming radio wave and receives the radar wave of the radar 1,
A timing line 16 as a communication line is connected between the timing detecting means 15 and the radar 1. In this example, the radar 1 and the electronic search device 2 are mounted on an aircraft and used. The timing line 16 is
The time between reception by the jamming station 4 is detected by the timing detection means 15 as a timing signal 17 shown in FIG.
Tell Upon receiving the timing signal 17, the radar 1 switches the transmission frequency from a frequency at which the normal radar operation is performed to a frequency that does not contribute to the normal radar operation. It makes it appear to the jamming station 4 that the radar 1 is performing a radar operation at a frequency different from the normal radar operation. For this reason, a false radar wave which does not contribute to the normal radar operation is transmitted. Since the false radar wave is received by the jamming station 4, the jamming station 4 jams the normal radar operation at a different frequency. Will be.

The interfering station 4 receives the radar radio waves of the radar 1, analyzes the transmission frequency, and causes the frequency of the interfering radio waves to follow the transmission frequency of the radar 1. At this time, if the interfering radio wave is transmitted, the radar radio wave of the radar 1 cannot be received. Therefore, the jamming station 4 stops transmitting the jamming radio wave, receives the radar radio wave of the radar 1, analyzes the transmission frequency,
The frequency of the jamming radio wave follows the transmission frequency of the radar 1 and interferes with the radar 1.

As shown in FIG. 2, the timing detecting means 15 detects the timing of switching between the transmission state and the reception state of the jamming radio wave.
3 and the output of the control device 14, and detects the timing of this switching.

As shown in FIG. 3, an edge 18 at the switching timing is detected by a timing detecting means 15 and is used as a timing signal 17. Timing detection means 15
Indicates that the high-level signal 1
9 and outputs a low-level signal 20 in a transmission state in which jamming radio waves are present. A timing signal 17 as this time information is transmitted to the timing line 16.

When the jamming station 4 stops transmitting the jamming radio wave, the timing signal 17 becomes a high level signal 19.
The high-level signal 19 is a signal for instructing the radar 1 to switch to a false radar radio wave having a transmission frequency different from the normal radar operation. Therefore, the jamming station 4 is caused to receive the false radar radio wave.

When the jamming station 4 starts transmitting jamming radio waves, the timing signal 17 becomes a low level signal 20.
The low-level signal 20 is a signal for instructing the radar 1 to switch from a false radar wave to a frequency at which a normal radar operation is performed. In response to this low level signal 20,
The radar 1 performs a radar operation and detects a target.

In operation, the basic radar operation is:
A normal radar operation similar to the conventional one is performed, and the radar 1 detects a target. The operation when the radar 1 receives jamming radio waves from the jamming station 4 is as follows. In the timing chart of FIG. 3, at time t1, radar 1 transmits transmission frequency fr.
As shown in FIG. 4 (a), when a normal radar operation is being performed, a jamming radio wave Z is received from the jamming station 4. The electronic search device 2 sends information such as the frequency fr of the jamming radio wave Z and the direction of arrival to the radar 1 via the data bus 3. The information on the jamming signal Z is received by the radar 1. At time t2, the radar 1 switches the transmission frequency fr to a frequency fα that is not included in the bandwidth B of the disturbing radio wave Z, that is, is not disturbed by the frequency control means 6. The radar 1 can perform a normal radar operation at this frequency fα without being covered by the bandwidth B of the jamming radio wave Z. In this way, the frequency fr at the time of the initial radar operation is switched to the frequency fα, and the normal radar operation is performed.

As shown in FIG. 4B, at time t3, the frequency fr used during the original normal radar operation is transmitted as a false radar radio wave. That is, the jamming station 4 generates the jamming radio wave Z
Is stopped, the radar wave of the radar 1 is received, and the operation of analyzing the transmission frequency fα is started. The timing during this reception is detected by the timing detection means 15 as a timing signal 17. This timing signal 17 is sent to the radar 1 via the timing line 16. The timing signal 17 is received by the radar 1. Therefore, while the interfering station 4 is in the receiving state, the radar 1 returns the transmission frequency from the frequency fα to the original frequency fr by the frequency control means 6, and transmits a false radar radio wave of the frequency fr. Since the jamming station 4 receives the false radar radio wave of the frequency fr, it analyzes that the radar 1 is performing the radar operation at the frequency fr irrelevant to the normal radar operation.

When the analysis operation in the jamming station 4 is completed at time t4, as shown in FIG. 4C, the jamming station 4 transmits the jamming radio wave Z including the frequency fr and restarts the jamming. The timing of this transmission is detected by the timing detection means 15 as a timing signal 17. From the timing signal 17, the radar 1 switches the transmission frequency to the frequency fα by the frequency control means 6 so as not to match the bandwidth B of the jamming radio wave Z, and returns to the normal radar operation. Radar 1 has frequency fα
Performs a normal radar operation and detects a target. By repeating such a transmission frequency switching operation, the radar 1 performs a radar operation and detects a target. Since this switching operation is a simple control for switching the setting of the transmission frequency between the two frequencies fr and fα, the switching time is short, and the operation of the system is fast.

As described above, the jamming station 4 stops transmitting the jamming radio wave Z to analyze the transmission frequency of the radar 1 and receives the radar radio wave of the radar 1. During this reception, the radar 1 sets the transmission frequency to a false radar wave having a frequency fr different from that of the normal radar operation, so that the interfering station 4 causes the radar 1 to perform the normal radar operation at another frequency fα. I can't recognize that. Therefore, the frequency fr of the jamming radio wave Z cannot follow the transmission frequency fα at which the radar 1 performs the normal radar operation, and the jamming station 4 continues the jamming at the frequency fr of the false radar radio wave. Normal radar operation can be performed at the frequency fα.

Further, as described above, it is only necessary to switch between two frequencies, ie, the frequency fα at which the normal radar operation is performed and the frequency fr of the false radar radio wave, and the frequency is switched from one to another as in the conventional case. Since the frequency does not need to be changed, the frequency can be easily switched. Moreover, even if a radar wave of frequency fα is transmitted in the target direction, the frequency of the jamming radio wave Z is the frequency fr, so that the radio wave can be transmitted in the target direction without interference and the target position can be detected. it can. Also,
Since the frequency fr of the false radar radio wave is transmitted when the high-level signal 19 at the time of reception at the jamming station 4 is generated, this can be reliably detected by the jamming station 4 side. Further, in the first embodiment, since the frequency fr of the radio wave originally used as the regular radar radio wave is used as the false radar radio wave, it is not necessary to set a new frequency for the false radar radio wave separately. Since it is only necessary to set the frequency fα of the radar radio wave, the circuit configuration for frequency output can be simplified. Further, since the switching time is short because the control is a simple control for switching the setting of the transmission frequency, the operation as a system can be sped up.

Embodiment 2 In the first embodiment, the radar 1 causes the interfering station 4 to receive the frequency fr used for the initial radar operation as the transmission frequency of the false radar wave as the false radar wave, and performs the normal radar operation at the frequency f.
Although the case where α is performed has been described, in the second embodiment,
As shown in FIG. 5, the interference station 4 receives a frequency fα not included in the band B as the transmission frequency of the false radar radio wave,
The radar 1 may perform a normal radar operation at the transmission frequency fr included in the band B.

In operation, as shown in FIG. 5A, when the radar 1 performs the radar operation at the frequency fr at time t1, it receives the jamming radio wave Z from the jamming station 4. As shown in FIG. 5B, at time t3, the jamming station 4 sets the radar 1
The receiving operation is started in order to analyze the transmission frequency fr. In accordance with this reception operation, the radar 1 switches the transmission frequency from the frequency fr to the frequency fα not included in the band B of the jamming radio wave Z, and transmits a false radar radio wave of the frequency fα. This frequency fα is received by the jamming station 4 and
As shown in (c), at time t4, the interfering station 4 sets the frequency fα.
And transmits the jamming signal K. Upon receiving this jamming radio wave K, the radar 1 switches the transmission frequency from the frequency fα to the frequency fr not included in the band B of the jamming radio wave K, but to the frequency fr contained in the band B of the original jamming radio wave Z. Perform radar operation and detect target.

As described above, the jamming station 4 stops transmitting the jamming radio wave Z to analyze the transmission frequency of the radar 1,
The radar wave of the radar 1 is received. During this reception,
Since the radar 1 sets the transmission frequency to the frequency fα different from the normal radar operation, the jamming station 4 cannot recognize that the radar 1 is performing the normal radar operation at another frequency fr. Therefore, the frequency fα of the jamming radio wave K cannot follow the transmission frequency fr at which the radar 1 performs the normal radar operation, and the jamming station 4 continues the jamming at the frequency fα of the false radar radio wave. A normal radar operation at the frequency fr can be performed.

In addition, it is only necessary to switch between the two frequencies of the frequency fr for performing the normal radar operation and the frequency fα of the false radar radio wave as described above, and to switch the frequency from one to the next as in the conventional case. Since the frequency does not need to be changed, the frequency can be easily switched. Moreover, even if a radar wave of frequency fr is transmitted in the target direction, the frequency of the jamming radio wave K is the frequency fα, so that the radio wave can be transmitted in the target direction without interference and the target position can be detected. it can. Also,
Since the frequency fα of the false radar radio wave is transmitted when the high level signal 19 at the time of reception at the jamming station 4 is generated, the jamming station 4 can reliably detect this. Further, in the second embodiment, since the frequency fr of the radio wave originally used as the normal radar radio wave is used as the normal radar radio wave, it is not necessary to set a new frequency for the separate normal radar radio wave. Since it is only necessary to set the frequency fα of the false radar radio wave, the circuit configuration for frequency output can be simplified. Further, since the switching time is short because the control is a simple control for switching the setting of the transmission frequency, the operation as a system can be sped up.

Embodiment 3 In the first embodiment, the timing line 16 is provided as a dedicated communication line between the radar 1 and the electronic search device 2 to transmit the timing signal 17, but in the third embodiment, FIG. As shown, a dedicated communication line may be provided in a part of the data bus 3 to form a timing line 21, and the timing signal 17 may be transmitted on the timing line 21. Since they are connected by the data bus 3, the device can be simplified.

As shown in FIG. 7, the timing line 21 is connected to the output of the timing detecting means 15, and transmits the timing signal 17 detected by the timing detecting means 15 to the radar 1. . As in the first embodiment, when the timing signal 17 is the high-level signal 20, the radar 1 transmits a false radar radio wave to the jamming station 4. When the signal is a low level signal, a normal radar operation is performed.

Thus, when the jamming station is transmitting jamming radio waves, the normal radar operation can be performed, and the normal radar operation can be performed without repeating the transmission frequency switching operation. In addition to this, it is possible to find the target in the direction of the jamming station by radar, and to simplify the device.

Embodiment 4 FIG. In the first embodiment, the case where the radar 1 and the electronic search device 2 are mounted on the same platform such as an aircraft has been described. However, in the fourth embodiment, as shown in FIG. And the electronic search device 2 may be mounted on the aircraft 23. In this case, the transmission of the information of the jamming signal and the timing signal 17 is performed by the data transmission device 2 connected to the radar 1.
4 and a data transmission device 25 connected to the electronic search device 2
And done by This transmission is performed by the data transmission device 2
This is performed by radio waves transmitted and received from antennas 24a and 25a mounted on the antennas 4 and 25. Further, transmission of the information of the jamming radio wave and the timing signal 17 may be performed using a light wave such as an infrared ray or a laser beam.

In this way, when the jamming station is transmitting jamming radio waves, the normal radar operation can be performed, and the normal radar operation can be performed without repeating the transmission frequency switching operation. Yes, and the target in the direction of the jammer can be found on radar. As in this embodiment, by disposing the radar 1 and the electronic search device 2 separately on different aircrafts 22 and 23,
It is possible to simplify the configuration of each of the aircrafts 22 and 23 incorporated in the radar system.

Embodiment 5 FIG. In the first embodiment, a case has been described in which a false radar wave is transmitted from the radar 1 in synchronization with the reception timing of the interfering station 4. However, in the fifth embodiment, as shown in FIG. May be connected to the radar 1 and the electronic search device 2 via the timing line 27 and the data bus 3, and the electronic jamming device 26 may transmit a false radar radio wave. In the electronic jammer 26,
A frequency control means 28 is built in, and a false radar radio wave is transmitted from the antenna 26a at any frequency.

The operation will be described. At time t1, when the radar 1 is performing a radar operation at the transmission frequency fr,
As shown in FIG. 10A, a jamming radio wave Z including the frequency fr is received from the jamming station 4. The electronic search device 2 sends information such as the frequency fr of the jamming radio wave Z and the direction of arrival to the radar 1 and the electronic jamming device 26 via the data bus 3. FIG.
As shown in (b), at time t3, the jamming station 4 stops transmitting jamming radio waves. At this time, the electronic search device 2 detects the timing signal 17 at the timing of receiving the jamming station 4 and sends it to the radar 1 and the electronic jamming device 26 via the timing line 27. From this timing signal 17, the radar 1 suspends transmission of a regular radar wave, and the electronic jammer 26 transmits a false radar wave at a transmission frequency fα different from the regular radar operating frequency fr. The jamming station 4 receives the false radar radio wave and analyzes the frequency fα. As shown in FIG. 10C, at time t4, the jamming station 4 transmits the jamming radio wave K including the frequency fα. The radar 1 resumes normal radar operation at the frequency fr, while the electronic jammer 26 suspends transmission of the false radar wave. The radar 1
If the normal radar operation is not hindered, the electronic jammer 2
6 may continue transmitting the false radar radio wave without suspending the transmission of the false radar radio wave. In this case, since the false radar radio wave is continuously transmitted, the timing line 27 becomes unnecessary, and the apparatus is simplified.

Further, as shown in FIG.
A dedicated communication line may be provided therein to form a timing line 29, and the timing signal 17 may be transmitted through the timing line 29.

As described above, the jamming station 4 stops transmitting the jamming radio wave Z to analyze the transmission frequency of the radar 1,
The radar wave of the radar 1 is received. During this reception,
Since the electronic jammer 26 transmits the false radar radio wave and sets the transmission frequency to the frequency fα different from the normal radar operation, the jamming station 4 recognizes that the radar 1 is performing the radar operation at the frequency fα. Therefore, the frequency fα of the jammer K
Is a transmission frequency fr at which the radar 1 performs a normal radar operation.
Cannot be followed, and the jamming station 4 continues the jamming at the frequency fα of the false radar radio wave.
Normal radar operation at

Further, as described above, the frequency f
Since α does not follow the transmission frequency fr of the radar 1, even if a radar wave is transmitted from the radar 1 to the jamming station 4, the jamming station 4 transmits the jamming wave K at the same frequency fα as the fake radar wave. The radar 1 performs a normal radar operation at the transmission frequency fα, and can find a target without being disturbed.

In this way, when the jamming station is transmitting jamming radio waves, the normal radar operation can be performed, and the normal radar operation can be performed without repeating the transmission frequency switching operation. Yes, and the target in the direction of the jammer can be found on radar. Further, since the fake radar radio wave is transmitted using the electronic jamming device 26, the present invention can be applied to the radar 1 having no frequency control means 6. Further, since the timing line 27 is not required, the device can be simplified.

Embodiment 6 FIG. In the fifth embodiment, the timing line 27 is provided as a dedicated communication line between the radar 1, the electronic search device 2, and the electronic jammer 26 to transmit the timing signal 17.
As shown in FIG. 12, the radar 1, the electronic search device 2, and the electronic jamming device 26 are connected by the data bus 3 without providing the timing line 27, and the electronic jamming device 26 transmits a false radar wave. Is also good.

The operation will be described. As shown in FIG. 13A, the radar 1 receives the jamming radio wave Z including the frequency fr from the jamming station 4. The electronic search device 2 sends information such as the frequency fr of the jamming radio wave Z and the direction of arrival to the radar 1 and the electronic jamming device 26 via the data bus 3. Radar 1
The transmission frequency is switched to the frequency fα so that it does not match the bandwidth B of the jamming radio wave Z. As shown in FIG. 13B, the electronic interference device 26 starts transmitting a false radar radio wave at the transmission frequency fr. As shown in FIG. 13C, the jamming station 4 stops transmitting the jamming radio wave, receives the false radar wave of the electronic jamming device 26, and starts analyzing the transmission frequency.
The jamming station 4 analyzes that the radar 1 is performing the radar operation at the frequency fr, and cannot recognize that the transmission frequency fα has been switched. Since the jamming station 4 continues jamming at the frequency fr, the radar 1 can perform a normal radar operation at the frequency fα.

In this way, when the jamming station is transmitting jamming radio waves, the normal radar operation can be performed, and the normal radar operation can be performed without repeating the transmission frequency switching operation. Yes, and the target in the direction of the jammer can be found on radar. Further, since the fake radar radio wave is transmitted using the electronic jamming device 26, the present invention can be applied to the radar 1 having no frequency control means 6.

Further, since the radar 1 and the electronic jamming device 26 are used irrespective of the reception time of the jamming station 4, the timing line 27 for transmitting the reception time of the jamming station 4 and the timing detection means 15 are not required, and the device can be simplified. Can be achieved.

Embodiment 7 FIG. In the fifth embodiment of the present invention, the case where the radar 1, the electronic search device 2, and the electronic jamming device 26 are mounted on the same platform such as an aircraft has been described. In the seventh embodiment, as shown in FIG. Alternatively, the radar 1 may be mounted on the aircraft 30 as a mobile station, and the electronic search device 2 and the electronic jammer 26 may be mounted on the aircraft 31 as mobile stations. In this case, the transmission of the information of the jamming radio wave and the timing signal 17 is performed by the data transmission device 32 connected to the radar 1, the electronic search device 2, and the electronic jamming device 26.
This is performed by the data transmission device 33 connected to. This transmission is performed by radio waves transmitted and received from antennas 32a and 33a mounted on the data transmission devices 32 and 33. Further, transmission of the information of the jamming radio wave and the timing signal 17 may be performed using a light wave such as an infrared ray or a laser beam. Note that, in the sixth embodiment, similarly to the fifth embodiment, a configuration in which the timing line 27 is not provided may be adopted. With this configuration, when the jamming station is transmitting jamming radio waves, the normal radar operation can be performed, and the normal radar operation can be performed without repeating the transmission frequency switching operation. Targets in the direction of the jammer can be found on radar. As in this embodiment, the radar 1, the electronic search device 2 and the electronic jamming device 26 are separately arranged on the separate aircraft 30, 31, so that the configuration of the radar system of each of the aircraft 30, 31 is incorporated. Can be simplified.

Embodiment 8 FIG. In the seventh embodiment, the electronic search device 2 and the electronic jamming device 26 are connected to the same aircraft 31.
In the eighth embodiment, the description has been given of the case where
As shown in FIG. 15, the radar 1 may be mounted on an aircraft 34, the electronic search device 2 may be mounted on an aircraft 35, and the electronic jammer 26 may be mounted on an aircraft 36. In this case, the transmission of the information of the jamming radio wave and the timing signal 17 is performed by the data transmission devices 37, 38, and 39 and the antennas 37a, 38a, and 39a connected to the respective devices. Further, the transmission of the information of the jamming radio wave and the timing signal 17 may be performed by using a light wave such as an infrared ray or a laser beam, and the timing line 27 may not be provided. With this configuration, when the jamming station is transmitting jamming radio waves, the normal radar operation can be performed, and the normal radar operation can be performed without repeating the transmission frequency switching operation. Targets in the direction of the jammer can be found on radar. As in this embodiment, by disposing the radar 1, the electronic search device 2, and the electronic jammer 26 separately on different aircraft 34, 35, 36,
It is possible to simplify the configuration of each of the aircrafts 34, 35, and 36 incorporated in the radar system.

Although the present invention has been described with respect to a case where a radar system is mounted on an aircraft, the present invention is not limited to this, and it is not limited to such a mobile station such as a ship or a vehicle or a fixed station fixed on the ground. The present invention can be applied to other stations.

[0059]

As described above, according to the first aspect of the present invention, a radar for obtaining a target position, a direction, and the like using a radio wave, and an interfering radio wave from the interfering station side to the radar are analyzed. Electronic search means for transmitting a false radar radio wave which does not contribute to the normal radar operation in accordance with the reception timing of the radio wave of the jamming station side, so that the jamming station side transmits the jamming radio wave. In this case, normal radar operation can be performed, normal radar operation can be performed without switching to a different transmission frequency, and simple switching operation can be performed. Can be found on radar.

According to the second aspect of the present invention, the detecting means for detecting the timing when the interfering station receives the radio wave from the radar and instructing to transmit the false radar radio wave is provided. When the jamming station is transmitting jamming radio waves, normal radar operation can be performed, and regular radar operation that can be easily switched without constantly changing the transmission frequency to another frequency is performed. This can be performed, and a target in the direction of the jamming station can be found by radar, and the jamming station can reliably receive a false radar wave.

According to the third aspect of the present invention, when the interfering radio wave is received by the radar, the transmitting frequency of the false radar radio wave included in the frequency band of the interfering radio wave is transmitted from the radar. Normal radar operation is performed at frequencies that are not included in the frequency band of the jamming radio signal, so when the jamming station is transmitting jamming radio waves, it can perform normal radar operation and always change the transmission frequency to another. It is possible to perform a normal radar operation in which a switching operation is simple without changing to a frequency, find a target in the direction of an interfering station with a radar, and simplify a circuit configuration of a frequency output.

According to the fourth aspect of the present invention, when the interfering radio wave is received by the radar, the transmitting frequency of the false radar radio wave not included in the frequency band of the interfering radio wave is transmitted from the radar, Since the normal radar operation is performed at the frequency included in the frequency band of the jamming radio wave, when the jamming station is transmitting the jamming radio wave, the normal radar operation can be performed and the transmission frequency is always different. It is possible to perform a normal radar operation in which the switching operation is simple without setting the frequency to the target frequency, find a target in the direction of the interfering station with the radar, and simplify the circuit configuration of the frequency output.

According to the fifth aspect of the present invention, the radar and the electronic search device are mounted on separate stations, respectively, and each station is provided with a data transmission device. Since the information of the above-mentioned jamming radio waves is communicated between each station, when the jamming station is transmitting jamming radio waves, normal radar operation can be performed and the transmission frequency is always set to another frequency. It is possible to perform a normal radar operation in which the switching operation is simple without performing the operation, find a target in the direction of the disturbing station by using the radar, and simplify the installation of the radar system in each station.

According to the sixth aspect of the present invention, a dedicated electronic jamming device for transmitting a false radar wave to the jamming station is provided. Therefore, when the jamming station is transmitting jamming radio waves, While regular radar operation can be performed,
It is possible to perform a regular radar operation with a simple switching operation without constantly changing the transmission frequency to another frequency,
The target in the direction of the interfering station can be found by the radar, and can be applied to a radar having no frequency switching means, and the apparatus can be simplified.

According to the seventh aspect of the present invention, the radar and the electronic search device are mounted on some stations, the electronic jamming device is mounted on another station, and data is stored in each station. A transmission device is provided to communicate the information of the above-mentioned jamming radio waves between each station, so that when the jamming station is transmitting jamming radio waves, normal radar operation can be performed and the transmission frequency is always different. It is possible to perform a normal radar operation in which the switching operation is simple without setting the frequency to the target frequency, find a target in the direction of the interfering station by radar, and simplify the incorporation of the radar system in each station.

According to the eighth aspect of the present invention, the radar, the electronic search device, and the electronic jammer are provided in separate stations, and each station is provided with a data transmission device.
Since the information of the jamming radio waves is communicated between the respective stations via this data transmission device, when the jamming station side is transmitting the jamming radio waves, normal radar operation can be performed and the transmission frequency is always maintained. Can perform normal radar operation with simple switching operation without changing to another frequency, and can find the target in the direction of the disturbing station by radar, and simplify the installation of the radar system in each station .

According to the ninth aspect of the present invention, the radar, the electronic search means, and the detection means are connected to each other, and a communication line for communicating the information of the interfering radio waves is provided between the radar and the electronic search means. Therefore, when the jamming station is transmitting jamming radio waves, normal radar operation can be performed and regular radar operation that can easily switch operation without changing the transmission frequency to another frequency must be performed. In addition to this, it is possible to find the target in the direction of the jamming station by radar, and to simplify the device.

According to the tenth aspect of the present invention,
The radar, the electronic search means, the detection means, and the electronic jamming device are connected to each other, and a communication line for communicating the information of the jamming radio is provided therebetween. In this case, normal radar operation can be performed, normal radar operation can be performed without switching to a different transmission frequency, and simple switching operation can be performed. Can be found by radar, and the device can be simplified.

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing a configuration of an electronic search device according to the first embodiment.

FIG. 3 is a timing chart illustrating timing signals according to the first embodiment;

FIG. 4 is an explanatory diagram illustrating an operation of the radar system according to the first embodiment.

FIG. 5 is an explanatory diagram illustrating an operation of the radar system according to the second embodiment.

FIG. 6 is a block diagram showing a configuration of a radar system according to a third embodiment.

FIG. 7 is a block diagram showing a configuration of an electronic search device according to a third embodiment.

FIG. 8 is a block diagram showing a configuration of a radar system according to a fourth embodiment.

FIG. 9 is a block diagram showing a configuration of a radar system according to a fifth embodiment.

FIG. 10 is an explanatory diagram illustrating an operation of a radar system according to a fifth embodiment.

FIG. 11 is a block diagram showing a configuration of a radar system according to a fifth embodiment.

FIG. 12 is a block diagram showing a configuration of a radar system according to a sixth embodiment.

FIG. 13 is an explanatory diagram illustrating the operation of the radar system according to the sixth embodiment.

FIG. 14 is a block diagram showing a configuration of a radar system according to a seventh embodiment.

FIG. 15 is a block diagram showing a configuration of a radar system according to an eighth embodiment.

FIG. 16 is a block diagram showing a configuration of a conventional radar system.

FIG. 17 is a block diagram showing a configuration of a conventional electronic search device.

FIG. 18 is an explanatory diagram illustrating an operation of a conventional radar system.

FIG. 19 is an explanatory diagram illustrating an operation of a conventional radar system.

[Explanation of symbols]

1 radar, 2 electronic search device, 3 data bus, 4
Jamming stations, 6 frequency control means, 8 search devices, 15 timing detection means, 16 timing lines, 22 aircraft, 24 data transmission devices, 26 electronic jamming devices.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-162285 (JP, A) JP-A-2-162284 (JP, A) JP-A-5-164840 (JP, A) JP-A 64-64 66583 (JP, A) JP-A-8-54457 (JP, A) JP-A-8-114670 (JP, A) JP-A-10-300837 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01S ^7/ 00-7/42 G01S 13/00-13/95 F41H 3/00

Claims (10)

(57) [Claims] 1. A radar for obtaining a position, a direction, and the like of a target using radio waves, and electronic search means for analyzing jamming radio waves from the jamming station side to the radar. And transmitting a false radar radio wave which does not contribute to a normal radar operation in accordance with the reception timing of the radio wave on the radar side. 2. The apparatus according to claim 1, further comprising detection means for detecting a timing when the jamming station receives a radio wave from the radar and instructing to transmit the false radar radio wave. The described radar system. 3. When the interfering radio wave is received by the radar, a transmission frequency of a false radar radio wave included in the frequency band of the interfering radio wave is transmitted from the radar, and the transmission frequency is not included in the frequency band of the interfering radio wave. 3. The radar system according to claim 1, wherein a normal radar operation is performed. 4. When the interfering radio wave is received by the radar, a transmission frequency of a false radar radio wave not included in the frequency band of the interfering radio wave is transmitted from the radar, and a frequency included in the frequency band of the interfering radio wave is transmitted. 3. The radar system according to claim 1, wherein a normal radar operation is performed. 5. The radar and the electronic search device are mounted on separate stations, respectively, each station is provided with a data transmission device, and information on the interfering radio waves is transmitted between the stations via the data transmission device. The radar system according to any one of claims 1 to 4, wherein the radar system communicates the following. 6. An electronic jamming device for transmitting a false radar wave to the jamming station.
The radar system according to claim 4. 7. The radar and the electronic search device are mounted on some stations, the electronic jamming device is mounted on another station, each station is provided with a data transmission device, and information on the interference radio wave is transmitted. The radar system according to claim 6, wherein communication is performed between the respective stations. 8. The radar, the electronic search device, and the electronic jamming device are provided in separate stations, each station is provided with a data transmission device, and the information of the interference radio wave is transmitted to each station via the data transmission device. The radar system according to claim 6, wherein communication is performed between stations. 9. A communication line according to claim 5, wherein said radar, said electronic search means, and said detection means are connected to each other, and a communication line for communicating the information of the interfering radio wave is provided between them. Radar system. 10. A communication line for connecting said radar, said electronic search means, said detection means, and said electronic jamming device, and for communicating information of said jamming radio wave between them. Item 7. A radar system according to item 6.