UKF (Unscented Kalman Filter) phase unwrapping method based on layered quantization tracking strategy
A phase unwrapping and strategy technology, applied in measurement devices, radio wave measurement systems, and radio wave reflection/re-radiation, etc., can solve the problems of low efficiency and large errors in the phase unwrapping method, and achieves a small amount of calculation, high precision, The effect of improving efficiency
Active Publication Date: 2015-11-11
GUILIN UNIV OF ELECTRONIC TECH
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[0006] The technical problem to be solved by the present invention is the problem of large error and low efficiency of the existing phase unwrapping method, and a UKF phase unwrapping method based on layered quantization tracking strategy is provided
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[0040] A UKF phase unwrapping method based on a hierarchical quantization tracking strategy. Firstly, the interferometric pixels are divided into different levels by using the interferometric phase quality map, and the interferogram is unfolded from high-quality level pixels to low-quality level pixels; then the definition based on The coherence coefficient or pseudo-coherence coefficient of the interferogram, and the path guidance map of the phase differential deviation; finally, by introducing the quantization path guidance map strategy, that is, the adjacent winding pixels of the expanded pixel are put into the queue array as the pixel to be expanded, and Determine the unwrapping order according to the size of the quantized path guide value of the pixel to be expanded in the queuing array, use the UKF phase unwrapping method in each unwrapping step to expand the pixel to be unwrapped with the largest quantized path guide value in the queuing array, and finally complete all wi...
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The invention discloses a UKF (Unscented Kalman Filter) phase unwrapping method based on a layered quantization tracking strategy, which comprises the steps of firstly dividing interference pixels into different levels by using an interferometric phase quality diagram, unwrapping an interference pattern according to the process from high-quality-level pixels to low-quality-level pixels; then establishing an unwrapping path guidance map based on an interference pattern correlation coefficient or a pseudo correlation coefficient and phase differential deviation; and finally, introducing a quantization path guidance map strategy, putting adjacent wound pixels of the unwrapped pixels into a queue array to act as pixels to be unwrapped, determining the unwrapping sequence according to the size of a quantization path guidance value of the pixels to be unwrapped in the queue array, unwrapping the pixels to be unwrapped with the quantization path guidance value to be the maximum in the queue array by using the UKF phase unwrapping method in each unwrapping step, and finally completing phase unwrapping of all wound pixels. The UFK phase unwrapping method disclosed by the invention has the characteristics of simplicity, effectiveness, small calculation amount, high precision and high robustness.
Description
technical field [0001] The invention relates to the technical field of interference synthetic aperture radar, in particular to a UKF phase unwrapping method based on a layered quantization tracking strategy. Background technique [0002] Interferometric Synthetic Aperture Radar (Interferometry Synthetic Aperture Radar, INSAR) has inherited the advantages of ordinary SAR imaging. The observation of "blind areas" makes it have special applications in geological disasters and polar glacier monitoring, polar and tropical rain forest area surveying and mapping, etc. Interferometric phase unwrapping is the most critical step and difficult problem in the application of INSAR technology. It has always been the focus of INSAR data processing technology research, attracting the attention of many scholars at home and abroad, and many solutions have been proposed. [0003] So far, traditional phase unwrapping methods can basically be classified into the following two categories: the fi...
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IPC IPC(8): G01S13/90
CPCG01S13/9023
Inventor 谢先明李莹慧刘庆华曾庆宁
Owner GUILIN UNIV OF ELECTRONIC TECH