Hypersonic velocity target TBD detection method for polynomial Hough conversion

Abstract

Aiming at the problem of signal accumulation detection of a hypersonic velocity maneuvering target in a near space in a radar scanning period, the invention discloses a hypersonic velocity target TBD detection method for polynomial Hough conversion, and aims to search movement of a matching target in a radial dimension by using polynomial with velocity and acceleration as parameters, associate by using orientation wave gates in a direction, map the energy on a target track to a parameter space for polynomial Hough conversion, and detect by comparing the maximum energy value of the parameter space with a constant false alarm threshold. According to the method disclosed by the invention, the problem of two-dimensional parameter searching is degraded to the problems of one-dimensional distance search and small-range association in orientation by setting the orientation wave gates, the order times of polynomial search are reduced by setting range gates, and thus the calculation quantity is greatly reduced; meanwhile, in addition to functions of a conventional Hough conversion TBD method, the method disclosed by the invention is also applicable to signal accumulation detection under conditions of strong target movement, fuzzy distance measurement, multiple targets and the like.

Description

technical field [0001] The invention belongs to the field of radar signal processing and data processing, and is suitable for solving the problem of non-coherent accumulation of radar inter-frame signals of hypersonic stealth maneuvering targets. Background technique [0002] Hypersonic aircraft in near space is a new concept weapon. It has the characteristics of fast speed, long distance, and strong stealth. It can attack any target in the world within 2 hours, which brings great challenges to radar detection and tracking. [0003] Long-term signal accumulation is an effective method to detect stealth targets. Signal accumulation can be divided into intra-frame accumulation during radar beam irradiation in a scanning cycle and inter-frame accumulation between radar scanning cycles. In order to maximize the signal of weak targets The noise ratio can be accumulated between frames on the basis of intra-frame accumulation. Track Before Detect (TBD) technology is a technology t...

AI Technical Summary

Problems solved by technology

The essence of the traditional Hough change method is to detect the straight line on the picture. When the radar measurement error is small, the target motion is in a straight line, and its detection performance is better. However, the distance of the hypersonic target in the adjacent space is very far, and the position error caused by the radar angle error is relatively large. Large, so that the track connection line of the target measurement is a "zigzag" broken line. When the noise or clutter points are relatively dense, the detection performance will be reduced when using the traditional Hough transform method for detection, which limits the minimum detectable signal. noise ratio

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