JPH03282385A - Radar equipment - Google Patents

Abstract

PURPOSE:To measure a fine disturbing signal, an interference signal, and various directional disturbing signals by using plural auxiliary antennas which have higher directional characteristics than a radar antenna and also have radiation centers in mutually different azimuths. CONSTITUTION:Microwave signals received by the plural auxiliary antennas 101 - 10N are detected by disturbing signal detectors 201 - 20N to detect disturbing signals and measure the frequencies. Then the detection and measurement are monitored manually or automatically under the control of a controller 700, and if a disturbing signal or interference signal is detected over one channel, a signal is sent to a signal selector 500 and the signal of the detector of the detected channel is sent to a various-element measuring instrument 600, which analyzes various radio wave elements such as the arrival azimuth, pulse width, etc., of the signal and displays various measured elements on a display console panel together with a radar video. When plural disturbing waves or interference waves are received at the same time, the controller 70 switches the selector 500 in order to take measurements. Consequently, the disturbing waves can be detected with high sensitivity and various radio wave elements including the arrival azimuth in the total frequency band of the radar are measured.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a radar device, and particularly to a radar device that has a function of automatically detecting and measuring jamming signals and interference signals, and avoiding them through automatic control. Regarding.

[Conventional technology]

Some modern radar equipment automatically detects jamming signals, displays the frequency of the detected jamming signal and presents it to the operator, and then switches to another frequency within a range of frequencies pre-given to the radar equipment. Some devices have a function that allows you to avoid interference by switching. In this type of radar equipment,
In addition to the radar antenna, it has a dedicated omnidirectional antenna, which makes it possible to detect interference waves arriving from unspecified directions, and at the same time has a receiver with a frequency band equivalent to the total frequency band of the radar. This makes it possible to detect any signal input within the radar operating frequency band.

However, in such a disturbance signal detection system,
Although it is possible to detect and measure the specifications of the interference wave, it is theoretically impossible to detect the direction of arrival of the interference signal because an omnidirectional antenna is used. Therefore, the video signal received at the radar antenna is defined as P P I (plan p
position (1indicator)) It is common to use a method in which the arrival direction of the interference wave is detected from the change characteristics of the received signal power in the azimuth direction by displaying it on a scope.

[Problem R to be Solved by the Invention] However, such conventional radar devices have the following problems.

First, since an omnidirectional antenna is used in the interference signal detection system, the antenna gain of the interference signal detection system is small, and furthermore, the reception frequency band is wider than that of a radar receiver, so reception sensitivity is low. As a result, the power of the interference signal received by the interference signal detection system is usually 30 to 40 dB lower than the power of the interference signal received by the main lobe of the radar antenna.

Therefore, even a jamming signal or interference signal that is reliably received by the radar may not be measured by the jamming signal detection system.

Second, out of the total frequency bands selectable for radar,
It is only possible to measure the direction of arrival of interference signals that are the same as the frequency that is actually selected and operated.

An object of the present invention is to provide a radar device that solves these problems.

[Means for Solving the Problems] A radar device of the present invention includes a radar antenna, a radar receiver connected to the radar antenna, and a radar signal detector that detects a signal received by the radar receiver. A radar device comprising a display for displaying the detected radar signal, a plurality of auxiliary antennas each having a radiation center in a different direction, and a plurality of auxiliary antennas each having a radiation center in a different direction, and a plurality of auxiliary antennas each having a radiation center in a different direction. a jamming signal detector connected to each of the blocks to detect the jamming signal, a signal selector to select the jamming signal detected by these jamming signal detectors, and measure the direction of arrival and radio wave specifications of the selected jamming signal. and a controller that controls the selection operation in the signal selector based on the measurement results of the disturbance parameters.

In addition, in a radar device that uses an active phased array antenna for radar as a radar antenna, a phased array auxiliary antenna that has higher directional characteristics than this antenna and a jamming signal detection device that is connected to this auxiliary antenna and detects a jamming signal are used. a specification measuring device for measuring the direction of arrival and radio wave specifications of the detected interference signal, and a specification measuring device for instructing the phased array auxiliary antenna to scan the beam direction based on the measurement results of the disturbance specifications. and a controller that instructs the interference signal detector to switch frequency hands.

Note that a sidelobe canceller processor can be attached to each of the radar devices.

Effect C] According to the present invention, by detecting interference signals using auxiliary antennas that have higher directional characteristics than radar antennas and each having a radiation center in a different direction, weak interference signals and interference signals can be detected. It becomes possible to measure reliably and also to measure interference signals in various directions.

In addition, by using a phased array auxiliary antenna, 1
A similar effect can be achieved with two auxiliary antennas.

〔Example] Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a system diagram showing a first embodiment of the radar device of the present invention. In the figure, 100 is a radar antenna that mechanically rotates in the azimuth direction, and 101 to ION each have a beam width wider than the radar antenna and a directional gain higher than the sidelobe gain of the radar antenna, and each has a radiation center in a different direction. N' (N is an integer) auxiliary antennas arranged so as to have

A transmitter 150 and a radar receiver 200 are connected to the radar antenna 100. Furthermore, this radar receiver 2
A radar signal detector 300° display and an operation console 400 are connected to the terminal 00.

Furthermore, signal detectors 201-2ON are connected to the auxiliary antennas 101-ION, respectively. These signal detectors 201 to 2ON include a signal selector 500 and a controller 7 that performs beam control of the auxiliary antenna and measurement control of radio wave specifications of interference waves.
00, and further connected to the signal selector 500 is an interference wave specification measuring device 600. This specification measuring device 60
0 is connected to the display and operation console 400. The controller 700 also controls the transmitter 150. Radar receiver 200. Signal selector 500. and specification measuring instrument 600
It is configured so that it can be controlled.

The operation of the radar device configured in this way will be explained. The transmitter 150 forms a microwave signal at a frequency specified by the controller 700 and radiates it into the air via the radar antenna 100. The microwave signal reflected by the object to be measured and received by the radar antenna 100 is detected by the receiver 200, and after unnecessary signals such as clutter are removed by the radar signal processor 300, it is displayed on the display 400. . Here, the receiver 200 forms a receiving frequency band specified by the controller 700, and detects only the received signal within the formed band.

On the other hand, the microwave signals received by the auxiliary antennas 101 to ION are detected by signal detectors 201 to 2ON, respectively, to detect a disturbance signal or an interference signal and measure the frequency. The controller 700 automatically controls interference signal detectors 201 to 2 in addition to manual instructions from the operator.
It monitors ON and sends a control signal to the signal selector 500 when a disturbing signal or interference signal is detected in any channel. The signal selector 500 receives this control signal, selects the output signal from the signal detector of the channel in which the disturbance signal or interference signal has been detected, and sends it to the specification measuring device 600. The specification measuring device 600 analyzes the selected signal and analyzes radio wave specifications such as the direction of arrival of the signal, pulse width, signal power, and pulse repetition period, and displays the signal on the display 400.
In addition to the radar video, various specifications of the measured disturbance waves or interference waves are displayed.

In addition, the display and console 400 transmits signal detectors 201 to 201 to the controller 700 based on the operator's operation.
Sends a 2ON selection signal. When a plurality of interference waves or interference waves are being received at the same time, the controller 700 makes it possible to measure these interference waves or interference waves by sequentially switching the signal selector.

Therefore, in this radar device, it is possible to select a plurality of auxiliary antennas 101 to ION having high directional gain to receive jamming waves or interference waves, so that jamming waves or interference waves can be detected with higher sensitivity than before. It enables detection and measurement of radio wave specifications including the direction of arrival within the general wave number band of the radar.

FIG. 2 is a system diagram showing a second embodiment of the present invention. In this embodiment, an SLC processor (sidelobe canceller) 800 is added to the first embodiment. That is, the SLC processor 800 is inserted between the radar receiver 200 and the radar signal detector 3000, and the outputs of the interference signal detectors 201 to 2ON are input to this SLC processor 800, and can be controlled by the controller 700. It is configured as follows.

According to the second embodiment, in addition to operating in the same way as the radar device according to the first embodiment, it also has an SLC function for removing detected interference signals.

That is, when the signal detectors 201 to 2ON detect an interference signal, the controller 700 determines the frequency, direction of arrival, and number of interference waves of the interference signal, and sends an SL signal to the SLC processor 800.
Specifies the auxiliary antenna channel used for C processing.

The SLC processor 800 performs beam combining processing between the received signal from the radar antenna and the received signal from the auxiliary antenna, and forms a null of the antenna directivity in the direction of arrival of the interfering wave. Remove interfering signal components from.

FIG. 3 is a system diagram showing the third embodiment of the present invention.
The same parts as in the embodiment are given the same reference numerals. This third
In this embodiment, the radar antenna 100 and the auxiliary antennas 101 to ION in the first embodiment are each replaced with phased array antennas. In other words, 100A is an active phased array antenna for radar, and 10IA is a phased array auxiliary antenna that has a wider beam width than the radar antenna, a higher directivity gain than the sidelobe gain of the radar antenna, and can form an SLC beam in all directions. . Further, an interference signal detector 201A is connected to this phased array auxiliary antenna 101A, and its output is inputted to the specification measuring device 600.

Note that illustration of the radar transmitter is omitted.

In this third embodiment, the controller 700 specifies the frequency for the radar active phased array antenna 100A based on manual specification by the operator or automatic control, and also controls the beam based on a preset beam scanning program. I do. In addition, this controller 70
0 is an auxiliary phased array antenna 101A based on predetermined frequency selection rules and a beam scanning program.
On the other hand, in order to uniformly scan the radar search coverage area while sequentially switching frequencies within the radar's total frequency band,
Instructs frequency switching and beam scanning.

Then, when the interference signal detector 201A detects a interference signal or an interference signal, the controller 700 fixes one of the plurality of beams in that direction and instructs the specification measuring device 600 to measure the radio wave specifications. At the same time, it instructs the auxiliary phased array antenna 101A to continue the search using other beams. When the interference signal is posted in this manner, the controller 700 instructs the radar active phased array antenna 100A to select a frequency by manual or automatic control.

Note that the specification measuring device 600 measures the direction of arrival of the signal, the pulse width,
After analyzing the radio wave specifications such as signal power and pulse repetition period, various specifications of the measured disturbance wave or interference wave are displayed on the display 400 in addition to the radar video, which is the same as in the previous embodiment.

Therefore, this radar device can also receive jamming waves and interference waves by using the phased array auxiliary antenna 101A having a high directional gain, so it is possible to detect jamming waves or interference waves with a higher degree of interference than before, and to use the radar. It becomes possible to measure radio wave specifications including the direction of arrival within the edge frequency band.

FIG. 4 is a system diagram showing the fourth embodiment of the present invention.
This is an example in which an SLC processor 800 is added to the embodiment shown in the figure.

That is, the radar receiver 200 and the radar signal processor 30
0, and the signal of the interference signal detector 201A is input thereto.

In this fourth embodiment, in addition to operating similarly to the radar device of the third embodiment, an S
Has LC function. In other words, when the signal detector 201A detects - in the interference signal, the controller 700 determines the frequency, direction of arrival, and number of interference waves of the interference signal, and sends the signal to the SLC processor 80.
0 specifies the channel of the auxiliary phased array antenna beam used for SLC processing. SLC processor 80
0 is active phased array antenna 10 for radar
Received signal at 0A and auxiliary phased array antenna 101
The interfering signal component is removed from the radar received signal by performing beam combining processing with the received signal at A and forming an antenna directional null in the direction of arrival of the interfering wave.

〔Effect of the invention〕

As explained above, the present invention uses an auxiliary antenna having higher directivity characteristics than a radar antenna, and comprises a plurality of auxiliary antennas having radiation centers in different directions, or a phased array auxiliary antenna. This makes it possible to measure and detect jamming waves or interference waves within the radar's total frequency band and within the radar's search coverage area, including the direction of arrival, with higher reception sensitivity than with conventional omnidirectional antennas. It is possible to obtain the effect that it is possible to suppress interference waves and interference waves by manual or automatic control and to avoid them by frequency selection.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of the first embodiment of the present invention, FIG. 2 is a system diagram of the second embodiment of the present invention, FIG. 3 is a system diagram of the third embodiment of the present invention, and FIG. 4 is the system diagram of the third embodiment of the present invention. FIG. 4 is a system diagram of a fourth embodiment of the invention. 100... Radar antenna, 100A... Active phased array antenna for radar, 101~ION... Auxiliary antenna, 101A... Phased array auxiliary antenna, 150... Transmitter, 200
... Radar receiver, 201-2ON... Jamming signal detector, 201A... Jamming signal detector, 300... Radar signal detector, 400... Display and operation console, 500... Signal Selector, 600... Specification measuring device,
700...Controller. Figure 3 00

Claims (1)

[Claims] 1. A radar antenna, a radar receiver connected to the radar antenna, a radar signal detector that detects a signal received by the radar receiver, and a display of the detected radar signal. a plurality of auxiliary antennas each having a higher directivity gain than the radar antenna and each having a radiation center in a different direction; A disturbance signal detector for detecting interference signals, a signal selector for selecting interference signals detected by these interference signal detectors, a specification measuring device for measuring the direction of arrival and radio wave specifications of the selected interference signals; A radar device comprising: a controller that controls selection operations in the signal selector based on measurement results of disturbance specifications. 2. A patent claim comprising a sidelobe canceller processor that performs correlation processing between the received signals received by the radar antenna and the auxiliary antenna to form a null of the radar antenna directional characteristic with respect to the arrival direction of the interfering signal. Radar device according to scope 1. 3. An active phased array antenna for radar, a radar receiver connected to this antenna, a radar signal detector that detects the signal received by this radar receiver, and a display that displays the detected radar signal. A radar device comprising: a phased array auxiliary antenna having higher directional characteristics than the antenna; a jamming signal detector connected to the auxiliary antenna to detect a jamming signal; a specification measuring device for measuring radio wave specifications; and a specification measuring device for instructing the phased array auxiliary antenna to scan the beam direction based on the interference specification measurement results, and instructing the interference signal detector to switch the frequency band. A radar device comprising: a controller for giving instructions. 4. A sidelobe canceller processor that performs correlation processing between the received signals received by the radar active phased array antenna and the phased array auxiliary antenna to form a null of the radar antenna directional characteristic with respect to the arrival direction of the interfering signal. A radar device according to claim 3, comprising: a radar device according to claim 3;