地形测绘用三天线机载干涉合成孔径雷达

回顾了中国科学院电子学研究所重复飞行机载L—SAR干涉系统和机载X波段双天线干涉SAR系统的研制和试验，阐述了利用收发天线分置结构拓展干涉基线长度的方法。在采用三天线的收发天线分置结构机载干涉SAR的基础上，构建三天线的双基线机载干涉SAR，并就其基线精密动态测量和基线优化设计两个关键技术以及系统性能进行了分析。分析结果表明，利用三天线构成的双基线机载干涉SAR是改进相位展开过程、提高高程测量精度的有效方法。

A Tri-antenna Airborne Interferometric Synthetic Aperture Radar for Topographic Mapping

Development and experiments on the repeat-pass airborne L-band interferometric SAR and the airborne X-band dual-antenna interferometric SAR developed by IECAS are reviewed. A method to achieve long baseline on small aircraft using tri-antenna configuration (one for transmitting, the other two for receiving) is described. On this basis, a dual-baseline single pass airborne interferometric SAR using three antennas is proposed. Two key points of the dual-baseline interferometric SAR, that is baseline dynamic measurement and baseline optimization, as well as its system performance are discussed. The results show that dual-baseline airborne interferometric SAR using three antennas is an efficient scheme to improve phase unwrapping processing and improve height measurement accuracy.