PS-InSAR precise search method based on maximum periodogram

Abstract

The invention discloses a PS-InSAR precise search method based on a maximum periodogram, and relates to the field of signal processing. Aiming at the indexes: the elevation of a satellite-borne SAR toa scene and deformation speed measurement precision, the invention proposes the PS-InSAR precise search method based on the maximum periodogram. The method mainly comprises three steps: 1, carrying out the phase filtering of a satellite-borne long-term sequence differential interference image, and screening out permanent scatterer pixels through the deviation amplitude criterion; 2, roughly estimating the elevations and deformation rate values of permanent scatterers based on the maximum periodogram criterion; 3, taking the result of the maximum periodogram rough estimation as an initial value, and performing the no-constraint precise searching of the elevation and deformation rate value based on the maximum time sequence correlation coefficient criterion.

Description

technical field [0001] The invention belongs to the field of signal processing, and in particular relates to a PS-InSAR precise search method based on a maximum periodogram. Background technique [0002] Synthetic aperture radar interferometry (InSAR) is a very promising surface deformation detection technology. It has the advantages of both synthetic aperture radar technology and interferometry technology. It can work all day and all day, has strong penetration ability and It can measure the three-dimensional information and deformation information of ground targets in a large area and with high precision. However, InSAR technology is very sensitive to factors such as atmospheric errors, remote sensing satellite orbit errors, surface conditions, and time-space irrelevance. Therefore, in 1999, Italian scholars Ferrettit and Rocca proposed the permanent scatterer technology, which not only got rid of the constraints of spatial and temporal decorrelation, but also estimated a...

AI Technical Summary

Problems solved by technology

The unconstrained search method based on the maximum time series correlation coefficient is to use the principle of the quasi-Newton method to find the optimal value of the objective function. This method has a small amount of calculation and a fast convergence speed, but it is not stable enough and is greatly affected by the setting of the initial value. Large; the maximum periodogram method is to perform spectral transformation on complex signals, transform from t-b space to h-v space, and find the corresponding value at the peak of the spectrum as the optimal value. It does not need to set the initial value, and the estimation accuracy is high and robust better performance, but the phase noise has a greater impact on the estimation results

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