| abstract |
The present invention is a method for estimating and compensating the ionospheric phase of synthetic aperture radar interferometry, which is characterized in that the specific steps of the method are as follows: step 1: accurate registration of primary and secondary images and resampling of secondary images; step 2: lookup table optimization and re-sampling Resampling the secondary images; Step 3: Band-pass filtering of the primary and secondary images and generation of full-bandwidth and sub-band differential interferograms; Step 4: Estimation of ionospheric phase; Step 5: Surface deformation phase calculation. The invention can obtain a more accurate registration offset, the coherence of the image is significantly improved, and the interference pattern is more continuous. The invention constructs the SLC images of the front and rear sub-bands, and the influence of the ionospheric path delay on the radar images can be identified by using the multi-aperture radar interferometry method. The method constructs two upper and lower subband signals with different center frequencies, and by optimizing the ionosphere estimation processing steps, the phase error caused by the electron density change of the ionosphere is estimated and eliminated, and the interferometric measurement accuracy is improved. |