Inclined MIMO GEO SAR System Design and Performance Analysis

Konferenz: EUSAR 2018 - 12th European Conference on Synthetic Aperture Radar
04.06.2018 - 07.06.2018 in Aachen, Germany

Tagungsband: EUSAR 2018

Seiten: 5Sprache: EnglischTyp: PDF

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Chen, Zhiyang; Hu, Cheng; Dong, Xichao; Cui, Chang; Li, Yuanhao; Weiming, Tian (Beijing Institute of Technology, P.R. China)

The current design of GEO SAR system has shortcomings of extreme high power and extreme long synthetic aperture time for high inclination ones and quasi Geo-stationary ones, respectively. In order to realize a GEO SAR system with relatively low power and short synthetic aperture time, optimization task and design result of a medium inclination MIMO GEO SAR for observing China are proposed, based on application demand. Generalized Ambiguity Function (GAF) of MIMO SAR is derived to give a feasibility comparison of different constellation configurations. System parameters are designed, followed by a design with a tradeoff between antenna size and power. In this paper, GAF of MIMO SAR is derived, and the feasibility of several configurations is analyzed accord-ing to the analytic expression. The serial-flying constel-lation parameter is optimized based on application re-quirement and the spectrum coverage characteristics are analyzed. Finally, the required transmitted power is calculated and a design with a tradeoff between antenna size and power is given.