Investigation on Along-Track Geoid Resolution Capabilities of HY-2 Based on Spectrum Analysis

doi:10.12068/j.issn.1005-3026.2023.09.014

Abstract

Abstract: The series of HY-2 satellites have accumulated a large amount of data， and the improvement of the resolution of the along orbit geoid of altimetry data is closely related to the refinement of the ocean gravity field model. This paper utilizes self-spectrum analysis， cross spectrum analysis， and coherence function calculation to estimate along orbit geoid resolution of satellite altimetry data. Spatially similar trajectory sequences of HY-2B and SARAL/AltiKa， as well as HY-2C and Jason-2， were selected to carry out the experiment. The results show that the average resolution of HY-2C is 19.15km， slightly better than HY-2B and Jason-2， but slightly lower than the SARAL/AlitKa Ka-band altimetry data with higher pulse repetition frequency. In addition， the repeated period collinear processing can significantly improve the resolution of along-track geoid by effectively suppressing noise. Under the condition of 5， 10 and 20 periods collinear processing， the resolution of HY-2B along orbit is improved by 19.26%， 38.56% and 46.69%， respectively. Therefore， when HY-2A， CryoSat-2 and other altimetry missions provide the observation sequence of geodetic missions with multi-period and repeated observations， the necessary collinear processing will bring more efficient data fusion for the refinement of marine gravity field model.

Key words: satellite altimetry; HY-2; spectral analysis; resolution capability; collinear processing

CLC Number:

P228

ZHOU Run-sheng， ZHANG Sheng-jun， KONG Xiang-xue. Investigation on Along-Track Geoid Resolution Capabilities of HY-2 Based on Spectrum Analysis[J]. Journal of Northeastern University(Natural Science), 2023, 44(9): 1328-1336.

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