摘要
为了有效探测PSInSAR中的永久散射体,充分考虑永久散射体对雷达波的强反射特性及强稳定性,文中提出三阈值探测法,即联合采用时序相关系数、振幅离差和振幅指数3重阈值串行结合的算法,该方法首先考虑雷达回波信号的强信噪比,用平均相干系数和振幅两道阈值挑选出永久散射体候选点,然后考虑永久散射体强稳定性,用振幅离差阈值从永久散射体后选点中进一步精选出永久散射体。最后利用澳门地区的30幅Envisat影像进行实验,证明该方法有效且可靠。
In order to effectively detect permanent scatterers in permanent scatterers interferometry,a three-thresholding automatic method is proposed taking into account the characteristics of strong reflection and stable backscattering of permanent scatterers to radar waves.It serially sets three thresholdings corresponding to time-series correlation-coefficient,amplitude dispersion index and amplitude index.In this method,considering the characteristic of high signal-noise-ratio,the average correlation coefficients and amplitude are firstly used to choose the initial candidates of permanent scatterers.And then further considering the strong stablility of permanent scatterers,the amplitude dispersion thresholding is utilized to produce the final permanent scatterers from the candidates.Finally,the proposed method is proved to be effective and reliable by an experiment with 30 Envisat synthetic aperture radar images in Macao.
出处
《测绘工程》
CSCD
2012年第4期1-4,共4页
Engineering of Surveying and Mapping
基金
国家自然科学基金资助项目(40574010)
