GeoWatch InSAR数据处理技术及在天津地面沉降监测中的应用

本文介绍了一种新的星载合成孔径雷达干涉测量数据处理技术（GeoWatch InSAR技术）,具有下述特点和优势：1.对城市和郊区农村全面连续覆盖,不仅包括建筑物,而且包括路面、广场、飞机跑道等其他地物和半植被覆盖的自然地区;2.合成处理多景/多波段/多模式/多极化/多轨道/多卫星平台的数据,从而缩短观测时间,提高精度和覆盖;3.所有结果为真正射投影图像,支持各种比例尺和范围的面状连续监测;4.支持ERS-1＆2、ENVISAT、ALOS PALSAR、JERS-1、RADARSAT-1＆2、TerraSAR、COSMO-SkyMed（CSK）和将来中国的HJ1小雷达卫星群。用此技术处理了天津地区的ENVISAT数据,得到了范围（抽样间隔）分别为100km×100km（50m×50m）、天津市（20m×20m）、廊坊市（15m×15m）及胜芳镇（7m×7m）的全面连续的地面沉降率图像,显示了它在地面沉降监测中的独特优势和应用前景。

GeoWatch InSAR Technique and Its Application to Land Subsidence Monitoring in Tianjin

This paper introduces a new space-born InSAR（synthetic aperture radar interferometry） data processing technique（GeoWatch technique） which has the following characteristics and advantages： 1.complete and continuous coverage to both urban and rural areas including not only persistent scatters but also distributed scatters including surface of road,airport runways,ground fields,and semi-vegetated natural areas;2.all results are truly ortho-rectified,supporting continuous monitoring in various customized scales and coverage sizes;3.support ERS-12,ENVISAT,ALOS PALSAR,JERS-1,RADARSAT-12,COSMO-SkyMed（CSK）,TerraSAR and the future Chinese small SAR satellite constellation.We processed the ENVISAT data of Tianjin area using this technique,and got average subsidence rate images with coverage sizes（sampling spacing） of 100km x 100km（50m x 50m）,Tianjin city area（20m x 20m）,Langfang city area（15m x 15m） and Shengfang town area（7m x 7m） respectively,showing unique advantage and application potential of this technique in land subsidence monitoring.