GEO卫星机会源近岸海面高度测量性能评估OA北大核心CSTPCD

It is potential to measure sea surface height using opportunity of source from geostationary earth orbit(GEO)satellites.Most studies focus on the experimental demonstrations,but few works comprehensively assess its perfor-mance.Based on this,the paper evaluates the influence of the signal bandwidth,incoherent integration number,signal-to-noise ratio(SNR)and retracking algorithm on the oceanic altimetry performance.It is found that once the incoherent inte-gration number and SNR are over the optimal incoherent integration number and SNR,the improvements of the altimetry performances are insignificant.Therefore,choosing optical incoherent average number,and designing the receiver antenna gain,radio-frequency gain,and receiver bandwidth to obtain optical SNR are needed.The fitting method can provide a bet-ter precision than the interpolation method.The data from the BeiDou B3I signal and ASTRA 19.2 E satellite experiments are used to assess the GEO opportunity-source altimetry.The experiment results show that for the incoherent average num-ber and SNR over 10 000 and 7 dB,respectively,the altimetry precision of about 0.20 m and 0.10 m can be obtained,re-spectively.Due to multi-frequency or multi-channel transmission,the spectral synthesis is proposed to improve the altime-try precision.The simulation results show that the synthetized signal from 10-channel signals of Zhongwei-1 satellite pro-vides a precision of 3.50 cm and 0.69 cm for the interpolation and fitting method.