A MODIFIED OMEGA-K ALGORITHM BASED ON A RANGE EQUIVALENT MODEL FOR GEO SPACEBORNE-AIRBORNE BISAR IMAGING

被引：2

作者：

Guo, Yiyu ^{[1
]}

Huang, Penghui ^{[1
]}

Xi, Peili ^{[2
]}

Liu, Xingzhao ^{[1
]}

Liao, Guisheng ^{[3
]}

Chen, Guozhong ^{[2
]}

Liu, Yanyang ^{[2
]}

Lin, Xin ^{[2
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Elect Informat & Elect Engn, Shanghai, Peoples R China

[2] Inst Shanghai Satellite Engineer, Shanghai, Peoples R China

[3] Xidian Univ, Natl Lab Radar Signal Proc, Xian, Peoples R China

来源：

2022 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS 2022) | 2022年

关键词：

GEO-SAR; BiSAR; frequency-domain imaging; Omega-K algorithm; spatial variance;

D O I：

10.1109/IGARSS46834.2022.9883356

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Geosynchronous spaceborne-airborne bistatic synthetic aperture radar (GEO-BiSAR) has the advantages of wide beam coverage, long exposure time, and superior system flexibility. However, it is a challenge for GEO-BiSAR to efficiently acquire SAR images both with high resolution and wide swath due to the severe range and azimuth spatial variances. To deal with this issue, a modified Omega-K method is proposed in this paper. In the proposed algorithm, an equivalent range model associated with GEO-BiSAR configuration is built, where the equivalent parameters of the airborne radar receiver absorb the phase parameters corresponding to the GEO transmitter. Then, the Stolt interpolation is performed to realize the range-azimuth decoupling, achieving the linearization between range and frequency variables. Finally, a well-focused SAR image could be obtained after residual spatial variance error compensation. Simulations are presented to demonstrate the effectiveness of the proposed method.

引用

页码：1844 / 1847

页数：4

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