Frequency Domain Imaging Method for One-Station Fixed Dual-Station Low-Frequency UWB SAR
An imaging method and a fixed technology, applied in the field of SAR imaging, can solve the problems that one-station fixed two-station low-frequency ultra-wideband SAR is not applicable, and achieve the effect of high-precision imaging processing, reducing influence, and well-focused images
Active Publication Date: 2017-08-25
NAT UNIV OF DEFENSE TECH
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[0006] The purpose of the present invention is to overcome the technical problem that the existing BiSAR imaging frequency domain method is not suitable for the situation of one-station fixed dual-station low-frequency ultra-wideband SAR, and provide a frequency-domain imaging method for one-station fixed dual-station low-frequency ultra-wideband SAR
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[0037] The present invention will be further explained below in conjunction with the accompanying drawings.
[0038] figure 1 A schematic flow chart of the principle flow of the one-station fixed dual-station low-frequency ultra-wideband SAR imaging method of the present invention. Such as figure 1 As shown, the whole process includes two processing steps: the first step, preprocessing; the second step, imaging the preprocessing result.
[0039] The present invention is verified through simulation experiments, and the results of theoretical analysis and simulation experiments prove the effectiveness of the present invention.
[0040] In the simulation experiment, the moving station is set as the transmitting station, the fixed station is set as the receiving station, and the international standard unit of measurement is adopted. The system simulation parameters in the present invention are as follows: figure 2 shown. The imaging scene setting and target arrangement are as...
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The invention provides a frequency domain imaging method for one-stationary bistatic low-frequency ultra-wide band SAR (Synthetic Aperture Radar). According to the technical scheme, the method comprises the following steps: firstly, based on echo signals of the one-stationary bistatic low-frequency ultra-wide band SAR, and compensating a high-order phase error in a two-dimensional frequency domain to obtain preprocessed echo signals; then, carrying out range imaging processing and azimuth imaging processing on the preprocessed echo signals to obtain an SAR image. The method has the benefits that the high-order phase error is compensated in the two-dimensional frequency domain, so that errors caused by second-order Tailor expansion of range and direction coupling terms are corrected, the influence of the high-order error on imaging processing in a low-frequency ultra-wide band signal is reduced, the high-precision imaging processing on the one-stationary bistatic low-frequency ultra-wide band SAR is implemented, and finally a good focused image is obtained.
Description
technical field [0001] The invention belongs to the field of SAR (Synthetic Aperture Radar, synthetic aperture radar) imaging, and relates to a frequency-domain imaging method suitable for one-station fixed two-station low-frequency ultra-wideband SAR. Background technique [0002] One-Stationary Low Frequency Ultra Wide Band Bistatic Synthetic Aperture Radar (OS LF UWB BiSAR) refers to a mobile transmitting / receiving platform and a fixed receiving / transmitting platform, and adopts low frequency Bistatic Synthetic Aperture Radar (Bistatic Synthetic Aperture Radar) system for ultra-wideband signals. Compared with traditional single-station low-frequency SAR, OS LF UWB BiSAR has the advantages of high security, strong anti-interference, and large amount of information, and has great application prospects. It has attracted extensive attention in recent years. [0003] According to different data processing domains, BiSAR imaging methods can be divided into two categories: time...
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IPC IPC(8): G01S13/90G06F19/00
CPCG01S13/9011G01S13/9058
Inventor 安道祥黄晓涛黎向阳李悦丽陈乐平周智敏谢洪途
Owner NAT UNIV OF DEFENSE TECH