Passive Radar Direction Finding Method and System Based on Single-Receiver Composite Scanning

Abstract

The invention discloses a passive radar direction-finding method and system based on single receiver compound scanning. The method includes: acquiring the echo signal of a receiver, wherein the receiver uses a compound rotation mode including elliptical motion spiral motion, and the long semi-axis and the short semi-axis of the spiral motion are gradually increased; according to the motion trajectory function of the receiver, determining a slant range of an object to be tested relative to the receiver; determining a discrete echo signal according to the slant range; decomposing the discrete echo signal to obtain a first decomposed echo signal and a second decomposed echo signal; determining a first direction-finding preprocessing vector according to the echo signal and the first decomposedecho signal; determining a second direction-finding preprocessing vector according to the echo signal and the second decomposed echo signal; determining the direction of the object to be tested according to the first direction-finding preprocessing vector and the second direction-finding preprocessing vector. The method and system effectively suppress the height of the side lobe and improves thedirection-finding performance of the passive radar.

Description

technical field [0001] The invention relates to the field of passive radar direction finding, in particular to a passive radar direction finding method and system based on single receiver compound scanning. Background technique [0002] At present, the traditional radar direction finding method generally requires the use of large-aperture antennas or long array antennas, which makes the system's manufacturing cost and use cost higher, and occupies a large area and is inconvenient for station deployment. In addition, the traditional radar direction-finding system needs to actively emit electromagnetic waves to illuminate the target, which is easy to be detected by the enemy and suffer firepower. Recently, a novel passive radar direction-finding system has appeared. In this system, the receiver performs uniform circular motion around the center of rotation. The angular resolution of the system is 0.36λ / r, where r is the radius of rotation of the receiver. The structure of the...

AI Technical Summary

Problems solved by technology

However, the theoretical peak sidelobe ratio of the system is -7.9dB, too high sidelobe will overwhelm the main lobe of the weak scattering point, causing the target to be lost, and the readability of the result is poor

In addition, the system occupies a large area and has the same resolution in all azimuths, so it is impossible to finely measure the direction of key areas

The existence of these problems greatly limits the application of the direction finding system

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