A method to improve the resolution of gnss-sar range compression signal

A compressing signal, high-resolution technology, applied in the field of SAR imaging

Active Publication Date: 2020-10-27
CHANGSHA UNIVERSITY
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Problems solved by technology

[0007] The purpose of the present invention is to propose a method for improving the GNSS-SAR range-to-compression signal resolution for the problem that the existing optimal range-to-resolution is limited to twice the signal bandwidth value

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  • A method to improve the resolution of gnss-sar range compression signal
  • A method to improve the resolution of gnss-sar range compression signal
  • A method to improve the resolution of gnss-sar range compression signal

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Embodiment Construction

[0027] The method for GNSS-SAR high-resolution remote sensing imaging provided by the present invention will be further explained in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] The first step is to preprocess the received GNSS-SAR echo signals to generate range-compressed signals.

[0029] For the reception of GNSS-SAR signal and the received signal model, please refer to literature [1-2]. Set in GNSS-SAR, Indicates the kth echo signal in the range time domain when the range direction is t and the azimuth direction is u; s m (t,u) represents the local matched filter signal when the distance direction is t and the azimuth direction is u. The preprocessing of the distance compression of the present invention is about to with s m (t,u) performs correlation operations in each code period T, and the expression of its signal term is:

[0030]

[0031] in represents the result of preprocessing; Indicates the pseudo-rando...

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Abstract

The present invention proposes a method for improving the resolution of GNSS-SAR range compressed signals. The technical solution includes the following steps: preprocess the received GNSS-SAR echo signal to generate a range compressed signal; perform square processing on the range compressed signal at each sampling point; perform range delay on the above results The second-order derivative processing is performed to obtain a range compressed signal with enhanced resolution; the range compressed signal with enhanced resolution is processed by carrier phase recovery, that is, a high-resolution range compressed signal is obtained. The invention can significantly improve the range resolution of the signal without affecting the subsequent processing of radar imaging.

Description

technical field [0001] The invention belongs to the technical field of SAR (Synthetic Aperture Radar, Synthetic Aperture Radar) imaging. Specifically, the invention relates to a method for processing the obtained range-compressed signal to improve its range resolution. Background technique [0002] A passive SAR system using GNSS (Global Navigation Satellite System, Global Navigation Satellite System) as a transmission source of opportunity (Transmission of opportunity), referred to as GNSS-SAR, has received extensive attention in the past ten years. Since its system does not require a specific signal transmitting device, its cost is much lower than that of traditional active SAR, and its concealment and anti-electronic detection performance are better. And because the transmission of GNSS signals is never interrupted, compared with other forms of passive SAR, GNSS-SAR can detect targets all-weather and without blind spots. [0003] However, due to the limitation of the GNS...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S7/41
CPCG01S7/41G01S13/9058
Inventor 郑昱张竹娴冯璐朱培栋吴鹏
Owner CHANGSHA UNIVERSITY
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