Method for withstanding false targets on basis of station's position error fusion algorithm

Abstract

The invention discloses a method for withstanding false targets on the basis of a station's position error fusion algorithm, and mainly solves the problems that station's position error factors are not considered when false targets are withstand in the prior art, so that detection results are inaccurate. According to the scheme, the method comprises the following steps: 1, measuring a target by a node radar; 2, carrying out coordinates transformation on measured values to obtain the position information of the target in a uniform rectangular coordinate system; 3, calculating to obtain a positioning error covariance matrix of the target through the position information of the target in the uniform rectangular coordinate system; 4, matching the measured values by a nearest neighbor association method to obtain an associated measurement sequences; and 5, combining the measured values in all the associated measurement sequences in pairs, calculating the mahalanobis distance between each two measured values through the positioning error covariance matrix of the target, carrying out hypothesis testing on the mahalanobis distances, and getting rid of false targets to finish identification of real targets and false targets. By the method, the correct identification probability of the rear targets is improved, and therefore, the method can be used for detecting or tracking targets.

Description

technical field [0001] The invention belongs to the technical field of radar, in particular to a method for fighting deceptive false targets, which can be used for target detection or tracking. Background technique [0002] With the gradual maturity of the field of electromagnetic interference, it has become common and easier for jammers to release jamming signals on detection systems. The existing transponder jammer can accurately copy the radar transmission signal instantaneously after receiving the radar signal, modulate it and forward the false target echo with different time delay from the real echo, so as to disrupt the radar system's detection of the real target. judge. [0003] In this case, the anti-jamming ability of the single-station radar is greatly limited, and it is difficult to carry out normal work. The networked radar system connects multiple node radars into a network, forming a high signal density and a signal form Changing radar signature space. Since...

AI Technical Summary

Problems solved by technology

However, the original algorithm ignored the actual radar site error in the modeling process, that is, the estimation error of the radar station’s own position: the radar station’s own positioning cannot be extremely accurate, especially when the radar station is in motion. state, the positioning error of the radar itself will increase with the increase of the radar movement speed, which will affect the identification of true and false targets

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