Distance frequency domain polynomial-phase transform based space mobile target detection method

Abstract

The invention relates to a distance frequency domain polynomial-phase transform based space mobile target detection method. The method comprises the steps of carrying out fast Fourier transform along a quick time direction of received mobile target echo data so as to acquire distance frequency domain-slow time data, then correcting a Doppler migration phenomenon occurred in the mobile target echo signals by using a distance frequency domain polynomial-phase transform method on the basis of the acquired distance frequency domain-slow time data, and carrying out phase-coherent accumulation on the echo data on the basis of correction so as to be applied to target detection. A simulation result is compared with processing results of a moving target detection method, a Radon-Fourier transform method, a fractional Fourier transform method and a Radon-FRFT method; and the simulation result indicates that the method can detect a target effectively under a condition that the coherent accumulation pulse number is limited and the signal-to-noise ratio is low, thereby verifying the effectiveness of the method provided by the invention.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing and space maneuvering target detection, in particular to a space maneuvering target detection method based on polynomial phase transformation in range frequency domain. Background technique [0002] Space maneuvering targets mainly refer to orbiting satellites, space stations, and space debris. In recent years, with the continuous deepening of the use of earth space resources by countries all over the world, the number of space maneuvering targets has also shown a rapid upward trend. With the increasing number of space maneuvering targets, these space maneuvering targets have brought greater threats to the orbiting operation of spacecraft and homeland defense, so the technology of space-based radar detection and identification of space maneuvering targets will become more and more important. Space maneuvering targets usually have a large acceleration, such as the acceleration of ...

AI Technical Summary

Problems solved by technology

Among them, the performance of the fractional Fourier transform method and the Radon-FRFT method in correcting Doppler walking will be greatly affected when the number of radar accumulated pulses is limited, while the Radon-Fourier transform method and the MTD method cannot correct the Doppler walking phenomenon. As a result, the target energy cannot be effectively accumulated, so the detection performance is poor

In short, none of the above methods can be directly used for space maneuvering target detection.

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