Incoming wave direction finding positioning method based on three-channel receiver and omnidirectional antenna

Abstract

The invention discloses an incoming wave direction-finding positioning method based on a three-channel receiver and an omnidirectional antenna. The method comprises the following steps: a pairwise orthogonal antenna system of three antennas is set; the received incoming wave signals are grouped in pairs according to three receiving channels, and corresponding incoming wave azimuth information is obtained according to amplitude comparison; angle errors caused by antenna spinning and relative motion are corrected; doppler frequency shift caused by relative motion is solved only through a few sampling points in a time domain; if the mode is the active detection mode, the distance from the moving target to the receiver at the t moment can be determined according to the received incoming wave signal; the relative movement speed (radial speed) between the target and the receiver is calculated according to the Doppler frequency shift at the t moment; the tangential speed of the moving target is calculated according to a small amount of sampling near the t moment; and the two speeds are synthesized to obtain the resultant speed of the moving target. According to the method, the working efficiency of searching the moving target can be remarkably improved, and accurate positioning is realized.

Description

technical field [0001] The invention relates to the field of radar direction-finding systems, and relates to an incoming wave direction-finding and positioning method based on a three-channel receiver and an omnidirectional antenna on a moving vehicle, in particular to a three-dimensional positioning and orientation of a three-channel receiver and an omnidirectional antenna on a moving platform The method is applicable to motion platforms such as spaceborne platforms and airborne platforms. Background technique [0002] Target direction finding and positioning is an important content of radar detection. The existing radar direction finding system is generally based on the two-dimensional plane assumption that the receiver rotation plane and the target are in the same plane, and can only perform 360° in the plane. 360° coverage of the entire airspace is not possible. Although there are also researches and improvements on 3D space positioning and orientation methods, most of ...

AI Technical Summary

Problems solved by technology

[0002] Target direction finding and positioning is an important content of radar detection. The existing radar direction finding system is generally based on the two-dimensional plane assumption that the receiver rotation plane and the target are in the same plane, and can only perform 360° in the plane. 360° coverage of the entire airspace is not possible

Although there are also researches and improvements on 3D space positioning and orientation methods, most of them are multi-base station joint positioning and direction finding on the ground, and there are few methods of using direction finding and positioning in any space. For example, direction finding on aircraft is still mostly used. It is a direction finding method in a two-dimensional plane, which can only measure the azimuth angle information of the target, but cannot measure the elevation angle information in space, and has great limitations

[0003] However, there is still no good solution for the three-dimensional direction finding positioning of moving vehicles for moving targets.

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