Wide aperture image processing and analysis for BSAR with GNSS transmitters

Abstract

The spatial variance of target scattering characteristic would introduce severe impact on the imaging results under the wide aperture for bistatic synthetic aperture radar (BSAR) with navigation satellites. If the isotropic point scattering mechanisms are adopted in image formation processing, the signal-to-noise ratio (SNR) of the image will decrease in such case. Therefore, it is necessary to study the corresponding compensation processing to improve the image SNR. This study proposes an adaptive imaging algorithm to compensate for the spatial variance caused by the target scattering in wide aperture of the system. By using experimental equipment of the research group, the echo data of 1600 s from the scene was collected and processed. Comparing strong scattering area imaging results before and after adaptive phase compensation, the focusing performance is improved. Also thus, the feasibility of wide aperture BSAR imaging based on navigation satellite was verified preliminarily.

Keywords

• image processing
• satellite navigation
• synthetic aperture radar
• radar imaging
• GNSS transmitters
• spatial variance
• target scattering characteristic
• severe impact
• imaging results
• bistatic synthetic aperture radar
• navigation satellite
• isotropic point scattering mechanisms
• image formation processing
• signal-to-noise ratio
• corresponding compensation processing
• image SNR
• adaptive imaging algorithm
• strong scattering area
• adaptive phase compensation
• wide aperture BSAR
• time 1600.0 s