JP2001264416A - Radar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently detect a target in a radar by forming a correct antenna pattern corresponding to the kind of the target. SOLUTION: An electronic scanning antenna 1 and a radar transmitter- receiver 2 are controlled by feeding beam schedulers 61, 62 with a plurality of coverage area different from each other in a switching manner, and as a result, an appropriate radar operation according to the kind of the target is possible, and the target can be efficiently and effectively detected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radar device having an electronic scanning antenna and detecting a target in a predetermined coverage area.

[0002]

2. Description of the Related Art A radar apparatus having a configuration shown in FIG. 3 is known for detecting a target within a predetermined coverage area by radar waves.

[0003] That is, an electronic scanning antenna 1 capable of forming an antenna pattern in an arbitrary direction by controlling a phase shifter is connected to a radar transmitting / receiving unit 2. The radar transmitting / receiving unit 2 and the electronic scanning antenna 1 drive signal of the radar control unit 3. Accordingly, the tracking of multiple targets can be performed almost simultaneously, and at the same time, the beam scheduler 4 can search the predetermined coverage area and display the detected targets on the indicator 5.

[0004]

However, in the above-mentioned conventional radar apparatus, the radar control unit forms an antenna pattern over a predetermined direction and coverage by a beam scheduler and receives a target reflected signal. ,
Depending on the type of target, effective and efficient searches were not always performed.

That is, when searching and tracking a general aircraft or the like flying in a space area within a certain height range, it is desirable to form a relatively low elevation angle and form a long-distance covered antenna beam pattern to search. It is.

In order to detect a missile arriving from the outside of the stratosphere due to a steep descent with a radar at an early stage, a search is performed using an antenna pattern having a large elevation angle, and a pulse wave having a short repetition period is derived to reduce the detection probability. It needs to be raised.

However, in the above-mentioned conventional radar apparatus provided with an electronic scanning antenna, tracking and searching are performed in a search area by an antenna pattern that is uniquely set in advance. It was difficult to search quickly and accurately in response to the situation.

Accordingly, an object of the present invention is to provide a radar device capable of detecting a target efficiently and quickly in accordance with the type of target target with a simple configuration.

[0009]

The radar apparatus according to the present invention comprises:
An electronic scanning antenna driven and controlled by a signal from the radar control unit to form and transmit and receive a predetermined beam, a radar transmitting and receiving unit connected to the electronic scanning antenna, and an instruction unit for displaying a target reflected signal from the radar transmitting and receiving unit And a plurality of beam schedulers that are switched by a switch and selectively supply mutually different beam schedules to the radar control unit.

As described above, the radar apparatus of the present invention is provided with a plurality of beam schedulers, and operates the radar control unit so as to selectively form a beam suitable for target detection by operating the switch. An optimal antenna pattern can be selected in response to target detection, and target detection can be performed quickly and accurately.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a radar apparatus according to the present invention will be described below in detail with reference to FIGS. The same components as those of the conventional configuration shown in FIG. 3 are denoted by the same reference numerals, and detailed description is omitted.

FIG. 1 is a block diagram showing an embodiment of a radar apparatus according to the present invention. In FIG.
An electronic scanning antenna 1 capable of forming an antenna pattern in an arbitrary direction by controlling a phase shifter is connected to a radar transmitting / receiving unit 2. The radar transmitting / receiving unit 2 and the electronic scanning antenna 1 are driven by a control signal of a radar control unit 3, At the same time, multiple targets can be tracked, and at the same time, a plurality of beam schedulers
The electronic scanning antenna 1 searches for a predetermined area by an antenna pattern selected from any one of the antennas 1 and 62.
Is controlled.

Therefore, when detecting a target for a general aircraft or the like, as shown in FIG. 2 (a), for example, an elevation angle θ1 is a relatively small elevation angle of about 30 degrees and a long distance. A command signal based on the data set by the first beam scheduler 61 is supplied to the radar control unit 5 via the switch 7 so as to form an antenna beam pattern A capable of searching for the. Therefore, the radar control unit 5 controls the electronic scanning antenna 1 and the radar transmitting and receiving unit 2 so that accurate target detection identified as clutter by MTI or the like is performed on an aircraft or the like in the low airspace in the antenna pattern A.

When a missile or the like flying from a high elevation angle is quickly captured, as shown in FIG. 2B, the elevation angle θ2 is relatively large at about 60 degrees and the distance (that is, the height) is small. In the relatively short coverage area, the second beam scheduler 62 sets a command signal based on the data of the antenna beam pattern B that can improve the detection probability with a high hit count,
The command signal is switched and supplied to the radar control unit 5 by the switch 7. Therefore, in this case, the first
The pulse data having a shorter transmission repetition cycle than in the beam scheduler 61 is supplied from the second beam scheduler 62 to the radar control unit 3 to instruct the radar control unit 3 to quickly and accurately capture missiles flying from a high altitude. it can.

In the configuration shown in FIG. 1, two beam schedulers 61 and 62 are provided so that switching control can be performed. However, the number of beam schedulers is not limited to two but can be set in multiple modes according to radar installation conditions, target search conditions, and the like. A beam scheduler may be provided and configured to switch and supply.

As described above, according to the radar apparatus of the present invention, the optimum antenna pattern corresponding to the type of the target to be detected is individually set in advance by the beam scheduler. By operating the switch 7, the target can be efficiently detected with a simple configuration.

[0017]

According to the present invention, a plurality of antenna patterns are set in advance, and the radar control unit switches between the patterns and introduces them. Therefore, a radar capable of accurately and efficiently detecting a target corresponding to a target target. An apparatus can be provided.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a radar device according to the present invention.

FIG. 2 is an antenna pattern diagram formed in the device shown in FIG.

FIG. 3 is a configuration diagram showing a conventional radar device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electronic scanning antenna 2 Radar transmission / reception part 3 Radar control part 4 Beam scheduler 5 Instruction part 61,62 1st and 2nd beam scheduler 7 Switching device 8 Switching controller

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5J021 AA05 AA06 AA11 AB01 DB03 EA02 GA01 HA04 JA10 5J070 AB03 AD08 AE04 AE06 AG07 AK13 AK16 BB21 BG01 BG05

Claims (2)

[Claims] 1. An electronic scanning antenna driven and controlled by a signal from a radar control unit to form and transmit and receive a predetermined beam, a radar transmitting and receiving unit connected to the electronic scanning antenna, and a target reflected signal from the radar transmitting and receiving unit And a plurality of beam schedulers which are switched by a switch and selectively supply different beam schedules to the radar control unit. 2. The radar according to claim 1, wherein each of the plurality of beam schedulers has antenna pattern data having a different coverage area in the elevation direction and radar pulse data having a different transmission repetition period corresponding to the antenna pattern data. apparatus.