Simulation Study on Baseline Error Estimation of Wide-Swath Altimeter by Interferometric Phase After Flat-Earth Phase Removal

摘要

The wide-swath altimeter uses interferometric synthetic aperture radar technology to obtain a wide-swath detection capability. Referable to the slow undulation of the ocean surface, flat-earth phase is dominant in the interferometric, and the interferometric phase after flat-earth phase removal can reflect the ocean surface elevation change. The nadir altimeter carried by the platform can perform consistent measurements with the wide-swath altimeter, so it is an ideal source of flat-earth phase calculations. Baseline roll error and baseline length error are important sources of error in wide-swath altimeter measurements. The spatial distribution of the interferometric in the cross-track direction can be used to estimate the baseline error. The simulation results show that the correlation coefficients between the estimated value and simulated value of the baseline roll error and the baseline length error both can reach 0.99, indicating that the baseline error can be well controlled.