Weak target detection tracking method based on mixed coordinate pseudo-spectrum technology

Abstract

The invention relates to a weak target detection tracking method based on a mixed coordinate pseudo-spectrum technology. The method comprises the steps of obtaining radar echo data; setting the widthand the number of speed filters; converting the resolution unit in the polar coordinate system into a Cartesian coordinate system to obtain a predicted Cartesian position of the resolution unit in thelast frame, and converting the predicted Cartesian position of the resolution unit into the polar coordinate system to obtain a predicted position of the resolution unit in the polar coordinate system; for each speed filter, constructing a pseudo spectrum according to the prediction position, and accumulating the intensity of each frame of pseudo spectrum to obtain a space domain accumulation plane and a speed domain plane of the speed filter; according to a preset detection threshold, judging whether a peak value accumulated by a speed filter is greater than the detection threshold, obtaining a spatial waveform and a speed dimension waveform after target multi-frame accumulation, and estimating a polar coordinate position and a Cartesian speed of the target; carrying out track backtracking; and outputting results. The method solves the problem that a traditional pre-detection tracking method cannot well process radar polar coordinate system data.

Description

technical field [0001] The invention relates to the technical field of target detection, in particular to a weak target detection and tracking method based on mixed coordinate pseudo-spectrum technology. Background technique [0002] The diversity of targets and the complexity of the environment make the detection capability of modern radars face enormous 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 d...

AI Technical Summary

Problems solved by technology

However, the MF-TBD of the existing technology has obvious defects: 1. It is only suitable for sensors with Cartesian coordinate system observation such as infrared and optics, but cannot handle sensors with polar / spherical coordinate system observation such as radar and sonar. ; 2. Use the data of one unit per frame for multi-frame accumulation, which will destroy the echo shape of the target after multi-frame accumulation, which is not conducive to further accurate estimation of target parameters; 3. Estimate the position and speed within the distance from the target On the nearest integer resolution unit, when the target is not on the integer resolution unit, the error is huge; 4. The method of setting the filter is not appropriate, just considering that the target falls on the resolution unit every frame, which does not conform to the actual situation

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