JPH04328481A - Three-dimensional radar equipment - Google Patents

Abstract

PURPOSE:To increase the reliability of target information in an angle measurement processing and to improve a tracking performance. CONSTITUTION:When angle measurement processing data on a target which can be detected at an angle phi1 of elevation at a search timing of an azimuth theta1 is not reliable while a search and tracking are executed according to scheduling of (a), the beam scanning azimuth theta1 and the angle phi1 of elevation at that time are stored and scheduling is made, as shown in (b), so that the search can be executed at the azimuth theta1 and the angle phi1 of elevation again at a timing subsequent to the search timing of the azimuth theta1. Then, beam scanning by a search beam is executed again and thus an operation of acquiring reliable target information is conducted.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic scanning three-dimensional radar device.

0002

2. Description of the Related Art As is well known, an electronic scanning type three-dimensional radar device has the function of evenly scanning the radar coverage area with a search beam, and detecting the track position of each target detected by beam scanning with the search beam. The monopulse method is usually used for angle measurement during search and tracking.

0003

By the way, in the monopulse method, as shown in FIG. 3, angle measurement processing is performed using the sum signal Σ and the difference signal Δ, but when the received signal level falls below the noise level, A sufficient signal-to-noise ratio (S/N) cannot be obtained, and the reliability of the angle measurement data decreases. Therefore, in the past, when the target could be detected but the angle measurement processing data was unreliable, the angle measurement processing was performed with the beam nose set as a temporary azimuth. This does not occur often, but since the target information is of poor quality as data used for tracking processing, there is a problem in that tracking performance deteriorates when it occurs.

An object of the present invention is to provide a three-dimensional radar device that can improve the reliability of target information in angle measurement processing and improve tracking performance.

[0005]

Means for Solving the Problems In order to achieve the above object, a three-dimensional radar device of the present invention has the following configuration. That is, the three-dimensional radar device of the present invention has a means for determining whether or not the angle measurement processing data regarding a detected target is reliable; and means for redirecting the search beam to the memorized azimuth and elevation angle.

[0006]

[Operation] Next, the operation of the three-dimensional radar system of the present invention constructed as described above will be explained. If the angle measurement processing data for the detected target is unreliable data, the beam scanning direction and elevation angle at that time are memorized and beam scanning is performed again with the search beam to obtain reliable target information. . As a result, the reliability of the angle measurement processing data can be increased, and the tracking performance can be improved.

[0007]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a three-dimensional radar device according to an embodiment of the present invention. In FIG. 1, this three-dimensional radar device basically comprises an antenna device 1, a signal processing device 2, and a beam control device 3. The signal processing device 2 includes a target detection/angle measurement processing section 21 , a reliability determination section 22 for angle measurement processing data, and a track tracking processing section 23 . The beam control device 3 also includes a beam scan scheduling section 32 and a beam scan azimuth and elevation angle calculation section 31. Since the basic operation of this three-dimensional radar device is well known, the following will mainly explain the portions related to the present invention.

It is assumed that the beam scanning scheduling section 32 of the beam control device 3 initially schedules the search mode and the tracking mode as shown in FIG. 2(a). In this state, for example, the received signal from the search beam in the azimuth θ1 is sent to the target detection/angle measurement processing section 2 of the signal processing device 2.
The angle measurement processing data of the detected target information is input to the angle measurement processing data reliability determining section 22.

When the reliability determination unit 22 of the angle measurement processing data determines that the input angle measurement processing data is unreliable,
The tracking processing unit 23 is caused to perform a suspension process, and the beam scanning scheduling unit 32 is notified of “unreliability”. This notification includes the azimuth θ1 and elevation angle φ1 of the beam nose at the time of detection, as well as the azimuth range in which the angle measurement processing data is unreliable (see FIG. 3).

[0010] In the beam scanning scheduling section 32,
The notified azimuth θ1 and elevation angle φ1 are memorized, and the direction shown in FIG.
), the search beam is scheduled to be directed to the azimuth θ1 and the elevation angle φ1 again at the next timing after the search beam at the azimuth θ1. As a result, the beam scanning azimuth and elevation angle calculation unit 31 calculates the azimuth and elevation angle so that the beam scanning can be performed again, and the antenna device 1 is driven.

[0011] When reliable angle measurement processing data is obtained as a result of the determination by the reliability determination unit 22 of the angle measurement processing data in the above rescanning, a notification of “reliability” is issued to the track tracking processing unit 23. Therefore, the track tracking processing unit 23 performs the track tracking process using the target information obtained by canceling the suspension.

0012

[Effects of the Invention] As explained above, according to the three-dimensional radar device of the present invention, when the angle measurement processing data for a detected target is unreliable data, the beam scanning direction and elevation angle at that time are stored. Then, beam scanning is performed again using the search beam to acquire reliable target information. Therefore, the reliability of the angle measurement processing data can be increased, and the tracking performance can be improved.

[Brief explanation of the drawing]

FIG. 1 is a configuration block diagram of a three-dimensional radar device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of beam scanning scheduling.

FIG. 3 is an explanatory diagram of the monopulse angle measurement method.

[Explanation of symbols]

1 Antenna device 2 Signal processing device 3 Beam control device 21 Target detection/angle measurement processing section 22 Reliability determination section of angle measurement processing data 23 Track tracking processing section

Claims (1)

[Claims] [Claim 1] Means for determining whether or not angle measurement processing data regarding a detected target is reliable; Means for storing the beam scanning direction and elevation angle at that time upon receiving notification that the data is unreliable; A three-dimensional radar device comprising: means for redirecting a search beam to the same azimuth and elevation angle;