一种高轨SAR带宽与合成孔径时间的设计方法

doi:10.3969/j.issn.1001-2400.2017.05.010

Abstract

Abstract:

The complex relative motions between the Radar platform and the targets are more complex in geosynchronous Synthetic aperture radar (GEO SAR). The assumption that range and azimuth are uncoupled in Low-Earth-Orbit SAR does not hold in GEO SAR. The common calculation method for bandwidth and synthetic aperture time cannot be used in GEO SAR. In this paper, a method suit able for GEO SAR is proposed to design imaging parameters including the bandwidth and synthetic aperture time. First, a resolution analysis method with analytical expression is deduced based on geometrical mapping, and then based this expression, the bandwidth and the synthetic aperture time are optimized to meet the resolution's needs on value and shape (close to a circle). Finally, a design example in a GEO ellipse orbit is given, and the resolution analysis result corresponds to the image obtained by the Back Projection (BP) method. The designed bandwidth and synthetic aperture time are also provided. Simulation results validate the effectiveness of the proposed method in the GEO SAR system design.

Key words: GEO SAR, signal bandwidth, synthetic aperture time, resolution ellipse, ambiguity function (AF)

LIU Wenkang;SUN Guangcai;CHEN Jianlai;XING Mengdao. Design method for bandwidth and synthetic aperture time in GEOSAR[J].Journal of Xidian University, 2017, 44(5): 58-63.

References

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Design method for bandwidth and synthetic aperture time in GEOSAR

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