Sea surface moving target detection and positioning method based on Beidou satellite radiation source

Abstract

The invention discloses a sea surface moving target detection and positioning method based on a Beidou satellite radiation source, is applied to the field of radar moving target detection, and aims atthe problem that the signal-to-noise ratio of target echoes by taking Beidou satellites as external radiation sources is low in the prior art. The method provided by the invention comprises the following steps of firstly adopting symmetric Keystone transform on the received target echoes from different Beidou satellites to obtain a distance migration correction result; performing framing processing and de-sloping-FFT on the respective echo signals corrected by distance migration to obtain an accumulation result of each echo signal; secondly inversely projecting the accumulation result of eachecho to the local coordinate system according to a differential double base distance to obtain an accumulation result of a plurality of echoes, so as to realize effective accumulation of target echosignal energies obtained by different Beidou satellites when a plurality of Beidou satellites are used as radiation sources; and finally detecting and locating the target according to the accumulationresult of the plurality of echoes in the step S3.

Description

technical field [0001] The invention belongs to the field of radar moving target detection, in particular to a passive radar moving target detection and positioning technology based on a satellite radiation source. Background technique [0002] Passive radar is a special dual (multi) base passive radar system. Unlike traditional radar, passive radar itself does not emit electromagnetic signals, but uses electromagnetic waves radiated by targets to detect targets. Because passive radar itself does not emit electromagnetic waves, it has strong concealment; at the same time, it can reduce volume and cost. In recent years, with the increase of the signal types and quantity of passive radar irradiation sources, the research on passive radar is increasing day by day. [0003] Most of the existing passive radars use ground signals as their signal sources, but because they can only cover land areas and cannot completely cover ocean areas, they are not suitable for large-scale moni...

AI Technical Summary

Problems solved by technology

However, the first-order Keystone transformation adopted by this method can only eliminate the first-order distance walking, while the second-order distance bending still exists, and the distance migration correction cannot be accurately realized.

At the same time, this method also has the disadvantages of large amount of calculation and cumbersome process.

In addition, this method only studies the case of a single satellite as a radiation source, and cannot achieve the positioning of moving targets on the sea surface

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