Method and device for detecting and tracking weak targets in rd plane based on velocity square filter

Abstract

The invention relates to an RD plane weak target detection tracking method and device based on speed square filter; the method comprises the following steps of acquiring multi-frame radar RD echo data, and establishing an echo model and a model for evolution of target distance and Doppler state; setting the width and the number of speed square filters; for each filter, predicting the target position according to the set speed square, constructing a pseudo spectrum, and realizing multi-frame pseudo-spectrum accumulation of the RD plane; judging whether a target exists or not according to a preset detection threshold, and if the target exists, utilizing the characteristics of the RD plane and the speed square domain waveform, estimating the distance, Doppler and speed square of the target; performing target RD plane track backtracking through the model used for evolution of target distance and Doppler state; and outputting a backtracking result. By virtue of the accurate target distanceDoppler evolution model provided by the invention, accurate multi-frame energy accumulation of the RD plane is achieved, and the detection probability and the estimation precision are improved.

Description

technical field [0001] The invention relates to the technical field of target detection, in particular to a method and device for detecting and tracking weak targets in RD plane based on velocity square filtering. Background technique [0002] Modern warfare requires radars to have weak target detection and tracking capabilities when performing long-range warning and early warning tasks. However, the development of stealth technology has reduced the radar cross-sectional area 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 large-scale holes in the air defense network, which poses a huge threat to national security. . In addition, in a strong clutter environment, the signal-to-clutter ratio of the target is significantly reduced, which urgently requires the radar to have a strong weak target detection capability. [0003] In order to solve th...

AI Technical Summary

Problems solved by technology

[0004] The derivation and implementation of the traditional TBD method are based on the Cartesian coordinate system. When the observation data matching process is performed on the RD (Range-Doppler, distance-Doppler) plane, the target with a constant Cartesian velocity will be on the RD plane. Approximately obeying a constant velocity or uniform acceleration linear motion, this model mismatch can lead to inaccurate target energy accumulation, especially when the target is very close to the sensor

Moreover, the traditional TBD method only uses one unit energy of the target echo for multi-frame accumulation, which will lead to insufficient energy accumulation of the target, and due to the suboptimal accumulation method, the target echo degrades after multi-frame accumulation

In addition, the traditional method can only estimate the target parameters on the integer resolution unit, when the target is not on the integer resolution unit, the error is very large

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