Study Of The Precision Of DEM Based On InSAR Technology

InS AR (Synthetic Aperture Radar Interferometry) is a kind of great potential microwave remote sensing technology which has developed fast in recent decades. This technology can not only get a large amount of data in a short time but also do the topographic survey on a large-scale in the large area where man can not reach. With the continuous progress of science and technology, this technology has the potential to develop into a kind of highly automated and high-precision topographic survey technology. One of the main application of InSAR technology is to obtain digital elevation model (DEM) quickly. However, due to various limitations, there are many technical problems for obtaining high-precision DEM using InSAR technology. At the same time, the precision of the DEM also affected by different external factors. Therefore, it is of certain practical significance to study the affection of different factors for the precision of the DEM which is obtained by the InSAR technology.On the base of the discussing for the fundamental principles of interferometry, interferogram.ect, an analysis was made on the error factors in the process of interferometry for obtaining DEM. And after that, a detail analysis was made on two of the factors (orbit error and baseline estimation error). For the orbit error, the two kinds of DEM using rough and precise orbit data respectively were compared with SRTM to get the errors. And then the analysis was made for the two kinds of error. In the analysis of the DEM precision using different baseline estimation methods, after the introduction of some kinds of the methods for baseline estimation, experiments were done on the comparing of DEM generated from different methods, each one of the methods were combined by some of the baseline estimation method introduced before.