Synthetic aperture radar imaging method and device based on non-linear frequency-modulated signals

A synthetic aperture radar and non-linear frequency modulation technology, which is applied in measurement devices, radio wave reflection/reradiation, radio wave measurement systems, etc., can solve problems such as algorithm copying, and achieve the effect of improving system performance

Active Publication Date: 2016-01-20
INST OF ELECTRONICS CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

[0004] However, the commonly used SAR imaging algorithms are all developed for LFM. Therefore, these algorithms cannot be copied to the SAR data processing of NLFM. It is very necessary to give a SAR imaging method for NLFM as the transmitted waveform.

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  • Synthetic aperture radar imaging method and device based on non-linear frequency-modulated signals
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  • Synthetic aperture radar imaging method and device based on non-linear frequency-modulated signals

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Embodiment Construction

[0056] In the embodiment of the present invention, according to the transmitted non-linear frequency modulation signal, the echo data is subjected to range pulse compression, the data of range pulse compression is determined, the slant distance error is determined, and the data of range pulse compression is compensated for reference according to the slant distance error. The motion error at the distance is used to obtain the compensated data; the improved Stolt mapping is used for the compensated data to obtain the data compensated by the RCMC and the range and azimuth coupling items; the residual motion error is compensated for the data compensated by the RCMC and the range and azimuth coupling items, and Perform azimuth focusing.

[0057] Below in conjunction with embodiment the present invention is described in further detail.

[0058] The SAR imaging method based on the non-linear frequency modulation signal provided by the embodiment of the present invention, such as fig...

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Abstract

The invention discloses a synthetic aperture radar (SAR) imaging method based on non-linear frequency-modulated signals. The method comprises the steps of: carrying out range pulse compression on echo data according to emitted non-linear frequency-modulated signals; compensating a motion error at a reference distance according to determined slant range error; then adopting Stolt mapping; and finally compensating a residual motion error and carrying out azimuth focusing. In this way, the imaging o the non-linear frequency-modulated signals is completed. The invention further discloses an SAR imaging device based on the non-linear frequency-modulated signals.

Description

technical field [0001] The present invention relates to Synthetic Aperture Radar (SAR, Synthetic Aperture Radar) technology, in particular to a SAR imaging method and device based on nonlinear frequency modulation signals. Background technique [0002] SAR is a high-resolution imaging radar that can obtain high-resolution radar images similar to optical photography under weather conditions with extremely low visibility. SAR is usually installed on an aircraft or satellite, and the distance and two-dimensional imaging. Linear Frequency Modulation (LFM, Linear Frequency Modulation) signal is the most commonly used transmission waveform in SAR. After this waveform is matched and filtered, the response function generated has a normalized peak side lobe ratio (PSLR, PeakSideLobeRatio) of -13dB. In order to suppress the height of the side lobe, weighted window function, adaptive filtering and optimization algorithms are usually used, but these methods make the matched filter mism...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/34G01S13/9011G01S13/9019
Inventor 王伟王宇王翔宇邓云凯张志敏徐伟李宁
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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