نوع مقاله : مقاله پژوهشی
نویسندگان
1 No 15,mehrparvar alley Zob ahan avenue,shafagh blvd
2 دانشگاه مالک اشتر
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
The main purpose of this article is to design and simulate an algorithm for the buried target from InSAR, and the purpose of this study is to start with the construction and analysis
of the subsidence rate of the subway tunnel in the construction of Isfahan city.
The main connections of InSAR for the construction and monitoring of subsidence of such goals are in determining the measuring time and reducing the correlation due to the change of the reflective characteristics of the geographical objects over time, which leads to the reduction of the interference coherence.
In the design of this algorithm, an attempt has been made to increase the degree of coherence between the interference views by using the interferometer radar time series processing and the selection of widespread stable scatterers, as well as the optimal and continuous graphic design between the images under processing, which causes the stability of the phase of the distributed targets.
Also, in order to reduce the amount of noise in the interference of views, in the stage before phase unwrapping, by applying a filter and suitable parameters to increase the signal to noise, in which the average coherence in the interference of the created views is 9% compared to other filters. It is closer to the number 1, which is the highest level of coherence, and in the end, in order to increase the accuracy and not to remove the regions with relatively low coherence, we will implement the optimal fuzzy unwrapping algorithm, which measures the average absolute value of the relative error in phase unwrapping by 12%. Finally it is clear that the subsidence of the target under study is different from the subsidence caused by natural causes such as underground water or drought and has a recognizable subsidence pattern.
کلیدواژهها [English]
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