US 12,449,533 B1
Method of a trust-region spaceborne dual-baseline interferometric SAR system
Yu Wang, Beijing (CN); QingYue Yang, Beijing (CN); and YaChao Wang, Beijing (CN)
Assigned to Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing (CN)
Filed by Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing (CN)
Filed on Apr. 4, 2025, as Appl. No. 19/171,082.
Claims priority of application No. 202410473833.3 (CN), filed on Apr. 19, 2024.
Int. Cl. G01S 13/90 (2006.01); B64G 1/10 (2006.01); G06F 30/367 (2020.01)
CPC G01S 13/9094 (2013.01) [B64G 1/1035 (2023.08); G01S 13/9023 (2013.01); G06F 30/367 (2020.01)] 6 Claims
OG exemplary drawing
 
1. A design method of a trust region satellite-borne dual-base interference SAR Synthetic Aperture Radar system, comprising the following steps:
step 1, calculating phase errors caused by image decoherence of the satellite-borne dual-base interference SAR system according to wave positions, and reserving an analytical expression of errors related to baseline parameters, wherein the baseline parameters comprise a baseline length and a baseline dip angle;
step 2, estimating a maximum phase error caused by image processing of the satellite-borne dual-base interference SAR system;
step 3, estimating a maximum phase error caused by an electronic device of the satellite-borne dual-base interference SAR system;
step 4, estimating baseline errors of the satellite-borne dual-base interference SAR system;
step 5, converting the phase errors caused by image decoherence of the satellite-borne dual-base interference SAR system in step 1, the maximum phase error caused by image processing of the satellite-borne dual-base interference SAR system in step 2, the maximum phase error caused by the electronic device of the satellite-borne dual-base interference SAR system in step 3 and the baseline errors of the satellite-borne dual-base interference SAR system in step 4 into elevation errors through an elevation fuzzy number to obtain an analytical expression of a relationship between the elevation errors and the baseline parameters;
step 6, with a relative height measurement accuracy index of the system as an optimization object, solving the analytical expression of the relationship between the elevation errors and the baseline parameters obtained in step 5 through a trust region optimization algorithm to obtain a feasible solution interval between the baseline length and the baseline dip angle; and
step 7, correcting a minimum value of the baseline length according to a flying-around safety distance of a dual-satellite formation.