主星带辅星编队单基线InSAR定位、测高两种方法

该文对主星带辅星编队分布式SAR(Synthetic Aperture Radar)的空间几何关系和工作原理进行分析,指出主星带辅星编队SAR用于干涉测高和定位具有星载双站、较大斜视,空间基线等特点和难点,不能基于经典干涉SAR几何下的测高方法进行分析.提出基于多普勒中心频率和基于距离模型的两种定位和测高方法,仿真验证了两种定位和测高方法的正确性.指出由于多普勒中心频率方程只利用了合成孔径中心时刻附近的距离信息,而距离模型方程可以利用合成孔径时间内的所有距离信息,因此从定性角度来说,基于距离模型的定位测高方法优于基于多普勒中心频率的定位测高方法,仿真结果也说明了这一点.

Two Methods of Spaceborne Multistatic InSAR Geolocation and DEM Generation

The article analyses the geometry and principle of spaceborne multistatic interf erometric synthetic aperture radar (InSAR) system.It is shown that conventional method of InSAR digital elevation model (DEM) generation can not be used here,b ec ause of the features of multistatic,large squint angle and space baseline of sp a ceborne multistatic InSAR system.Two methods of multistatic InSAR geolocation an d DEM generation are presented:one is based on Doppler-centroid equation,and t h e other is based on range model equation.Simulation results show that the two me thods are correct.Doppler-centroid equation only makes use of range values betw e en target and satellites,which is nearby the centre of synthetic aperture,whil e the range model equation can use all range values.So the method based on range m odel equation is more excellent than another one,which is proved by simulation results.