排序方式: 共有70条查询结果,搜索用时 15 毫秒
21.
大型人工线状地物是人类改造自然的产物,同人类生活息息相关。本文从大型人工线状地物定义出发,阐述了其形变现象、成因及衍生灾害;并利用多基线差分雷达干涉测量技术(DifferentialSyntheticApertureRadarInterferometry,DInSAR)实施大型人工线状地物形变监测。通过多数据源实验(ENVISATASAR,广州;PALSAR,香港大屿山;TerraSAR-X,深圳),分析了当前高级DInSAR方法,包括永久散射体和相干目标法在监测大型人工线状地物形变上的能力。实验结果表明,采用了不同的影像干涉对组合策略,永久散射体法适合大数据量SAR影像处理,而相干目标法适合小数据量SAR影像分析。微波穿透性和垂直临界基线随波长增加而增加。因此,在波段选择上,低相干区宜选用长波SAR数据(比如ALOSPALSAR)以获取稳健反演结果;而高相干区宜选用短波TerraSAR-X或者ENVISATASAR数据,以获取高精度地表形变场。结合线状地物几何和物理特性,分别从先验基础GIS/GPS数据、SAR数据源选择、PS点提取和模型改进四方面进行分析和探讨,认为面向线状地物形变监测多基线DInSAR模型的研发是亟待解决的问题。 相似文献
22.
����Doris��̨�弯������ͬ��λ�Ƴ����� 总被引:1,自引:0,他引:1
?????????????Doris,???????????DInSAR?????????1999??9??21????弯??????????λ??????????????????в??????????Ч???????????????????????????????????????????????????????????????????????????????????????????????????????????????а??????????????GPS???????????????????????????????б????????λ?????GPS?????к????????? 相似文献
23.
�½�٤ʦǿ��Ⱥ����InSAR�۲��о� 总被引:23,自引:17,他引:6
????????????ERS1/2 SAR????????????NASA??????SRTM?????????DEM???????1996??1999??????????????????????????????????????????????????????α??????????????????????????????????????????????????????5 mm/a(LOS????)??????1998??8??2??Ms6.0?????27??Ms6.6???????????????????? 相似文献
24.
25.
26.
27.
28.
????OKADA??????????????????????????????????????????????α???????????????????????α??????????????????????????,??????????,???????α?????-109.7 cm??????????????????α????19.2 cm??????????????????????????????????????α?????-51.4 cm????????????,????α?????98.5 cm???????????????????????????????????????α?????-66.5 cm?????????????????????α????25.8 cm????????????α?????????????????????????????????????α???????????????????????????????????????????? 相似文献
29.
30.
Measurement of volcanic surface movement is an operational technique at many volcano observatories to help understand internal
processes and to aid in eruption forecasting. The potential of differential radar interferometry (DInSAR) to map patterns
of surface deformation on volcanoes is well-proven. However, the technique has not yet become operational, partly because
current spaceborne radars were not designed for the task. We discuss the limitations of the European Space Agency's ERS SARs
for this purpose in terms of: radar system constraints, volcano surface characteristics, interpretational uncertainties and
the operational context. We illustrate the drawbacks at typical stratovolcanoes in South America, chosen to represent a range
of conditions. For non expert users of DInSAR, knowing how well DInSAR will work on a particular volcano is important. Freely-available
global datasets of vegetation cover and atmospheric water vapour content can be used as proxy measures of coherence and path
delay effects, which are the two main determinants of data quality. Operational volcano DInSAR is still years away, but many
of the characteristics of such a system can be specified based on the experience learned from earlier radars. 相似文献