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Azimuth uniform sampling implementation system and method for multi-channel synthetic aperture radar (SAR)

A technology for uniform sampling and realization of the system, applied in the aerospace field, can solve problems such as non-uniform sampling, achieve low latency, improve computing efficiency, and save hardware resources.

Pending Publication Date: 2021-11-05
BEIJING INST OF RADIO MEASUREMENT
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Problems solved by technology

But the key problem of multi-channel mode SAR is that the mechanism of multi-channel reception will lead to the appearance of non-uniform sampling in the direction of the channel

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  • Azimuth uniform sampling implementation system and method for multi-channel synthetic aperture radar (SAR)
  • Azimuth uniform sampling implementation system and method for multi-channel synthetic aperture radar (SAR)
  • Azimuth uniform sampling implementation system and method for multi-channel synthetic aperture radar (SAR)

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Embodiment Construction

[0021] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0022] Due to the unavoidable hardware and circuit errors and satellite attitude and pointing errors in the radar system during operation, the amplitude and phase between channels will be inconsistent, that is, there is a problem of amplitude and phase errors between channels. It is shown that the forward distance of the multi-channel SAR antenna in one pulse period is not equal to half the antenna length, so most of the time the multi-channel azimuth sampling is non-uniform, which will lead to the occurrence of range migration correction and focusing error, which requires The original received signal is sampled and homogenized through the preprocessing operation, and the azimuth spectrum of the signal is recovered. ...

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Abstract

The invention relates to an azimuth uniform sampling implementation system and method for a multi-channel SAR (Synthetic Aperture Radar). The system is used for reconstructing a homogenized original received signal through an inverse filter, and a matrix inversion part realizes variable order Vandermonde matrix rapid inversion based on Lagrange interpolation through an FPGA (Field Programmable Gate Array); the variable-order Vandermonde matrix rapid inversion part comprises an element cache module, a first branch formed by a u matrix element calculation module and a v matrix element calculation module, a second branch formed by a pi vector and a reciprocal calculation module thereof, and a matrix multiplication module. According to the system, original receiving signals are reconstructed and homogenized through the inverse filter, azimuth uniform sampling of the multi-channel SAR is achieved, and for the inverse filtering matrix inversion part, variable-order Vandermonde matrix rapid inversion based on Lagrange interpolation and parallel operation of two branches are achieved through the FPGA, so operation efficiency can be improved, hardware resources are saved, and finally, high-precision Vandermonde matrix inversion operation under the conditions of low resources and low delay is realized.

Description

technical field [0001] The invention relates to the field of aerospace technology, in particular to a system and method for realizing uniform sampling in azimuth for multi-channel SAR. Background technique [0002] The multi-channel mode SAR transmits a single beam and receives multiple echoes simultaneously through multiple receivers. When spaceborne SAR works in multi-channel mode, it adopts a multi-phase central azimuth multi-beam system, which solves the gap between the high azimuth resolution of traditional single-channel SAR imaging and the wide-range surveying zone while ensuring high azimuth resolution. contradiction. But the key problem of multi-channel mode SAR is that the mechanism of multi-channel reception will lead to the appearance of non-uniform sampling in the azimuth direction between channels. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a system and method for realizing uniform sampling i...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/285
CPCG01S13/9004G01S7/285
Inventor 李炳沂孙晗伟刘振赵勇王新民郭路鹏
Owner BEIJING INST OF RADIO MEASUREMENT
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