A Tracking-before-Detection Method for Weak Targets Based on Virtual Spectrum

Abstract

The invention relates to a method for performing tracking before weak target detection based on virtual spectrum, comprising: acquiring radar echo data and obtaining a target single-frame echo function; obtaining the velocity resolution based on a velocity domain envelope of target multi-frame accumulation, and determining the number of velocity filters; for each velocity filter, constructing a virtual spectrum whose peak value is the measurement value of a resolution unit, wherein the center position is the target position of the last frame predicted by the velocity filter; accumulating the intensity of the virtual spectrum of each frame in a current batch to obtain a multi-frame accumulation result of each velocity filter; according to a preset detection threshold, judging whether the peak value of the velocity filter exceeds the detection threshold or not, otherwise judging that a target is not detected, recording a position unit and a velocity unit where the maximum peak is, and estimating the position and velocity of the target according to spatial domain and velocity domain waveforms of the target; and performing track backtracking and outputting. The method can improve the signal to noise ratio gain, detection probability and parameter estimation precision after multi-frame accumulation.

Description

technical field [0001] The invention relates to the technical field of target detection, in particular to a virtual spectrum-based weak target tracking method before detection. Background technique [0002] The diversity of targets and the complexity of the environment make the detection capability of modern radars face huge challenges, and the problem of weak target detection is one of them. The development of stealth technology has reduced the RCS (radar reflection cross section) of the aircraft by one to two orders of magnitude, the target reflection echo has been greatly weakened, and the radar detection power has been significantly reduced, resulting in a large area of ​​holes in the air defense network, which has brought great harm to national security. threaten. On the other hand, the flight speed of the target has been greatly increased, which has sharply reduced the radar warning time. For this reason, radars are required to detect distant targets with weaker echo...

AI Technical Summary

Problems solved by technology

The traditional method only considers the situation that the target falls on the resolution unit every frame in the filter bank setting, which is inconsistent with the actual situation, because the target cannot always be on the resolution unit, it will move between the resolution units

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