Detection and positioning method of sea surface moving target based on Beidou satellite radiation source

A Beidou satellite and moving target technology, applied in the direction of using re-radiation, reflection/re-radiation of radio waves, measurement devices, etc., can solve the problems of inability to accurately realize distance migration correction, large amount of calculation, and inability to achieve sea surface positioning, etc. Achieve the effect of realizing distance migration correction and reducing the amount of calculation

Active Publication Date: 2021-01-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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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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  • Detection and positioning method of sea surface moving target based on Beidou satellite radiation source
  • Detection and positioning method of sea surface moving target based on Beidou satellite radiation source
  • Detection and positioning method of sea surface moving target based on Beidou satellite radiation source

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Embodiment Construction

[0051]In order to solve the problem that the signal-to-noise ratio of the echo signal of the moving target received by the Beidou satellite is extremely low, the observation time of the target is increased. In the case of long observation time, neither the range walk nor the range warp can be ignored. The present invention adopts the symmetrical Keystone transformation, which can eliminate the range walk and range warp at the same time when the Doppler parameter is unknown, and realize accurate range migration correction. Due to the change of target scattering characteristics under long observation time, coherent accumulation cannot be directly carried out. The present invention adopts the method of sub-frame processing, regards the intra-frame signal as coherent, performs coherent accumulation on the intra-frame signal, and conducts non-coherent accumulation on the inter-frame signal. accumulation. The present invention adopts a unified deskewing process for the signal proces...

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Abstract

The invention discloses a sea surface moving target detection and positioning method based on Beidou satellite radiation source, which is applied to the field of radar moving target detection, and aims at the problem of low signal-to-noise ratio of target echoes existing in the prior art with Beidou satellite as an external radiation source; The present invention first adopts symmetrical Keystone transformation to the received target echoes from different Beidou satellites to obtain the distance migration correction result; Obtain the accumulation results of each echo signal; secondly, back-project the accumulation results of each echo to the local coordinate system according to the differential bibase distance, and obtain the accumulation results of multiple echoes, realizing that when multiple Beidou satellites are radiation sources, different Beidou The energy of the target echo signal obtained by the satellite is effectively accumulated; finally, the target is detected and positioned according to the accumulated results of multiple echoes in 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...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/50
CPCG01S13/50
Inventor 李中余黄川张丽君武俊杰黄钰林杨海光杨建宇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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