基于GPS的InSAR大气延迟校正方法研究

摘要

基于GPS和InSAR大气延迟的关联性和空间分辨率的差异,利用PSO(Particle Swarm Optimization)优化算法辅助LSSVM( Least Square Support Vector Machine)寻求最优参数对GPS大气延迟进行插值,以实现GPS对InSAR大气延迟进行逐像元改正.分析证明,利用GPS技术改正InSAR大气延迟值约为30 mm,显著提高了InSAR技术精度.%The atmospheric delay has limited the application of InSAR in the field of deformation monitoring and so on. On the basis of relationship and difference of the spatial resolution of the GPS and InSAR atmospheric delay, optimizing LSSVM parameters by the PSO algorithm, and interpolating the GPS atmospheric delay, then correcting the InSAR atmospheric delay are carried out pixel by pixel. Through the experiment and analysis, the InSAR atmospheric delay could be corrected about 30 mm by GPS to improve the InSAR precision in the experiment region.