卫星跟踪卫星测量模式中星载加速度计高低灵敏轴分辨率指标优化设计论证

本文利用改进的能量守恒法开展了GRACE星载加速度计与K波段星间测速仪及GPS接收机精度指标之间的匹配模拟论证. 结果表明：（1）采用GRACE公布的其他载荷精度指标，当加速度计分辨率指标设计为ACC_X=(1～10)×10^-9m/s², ACC_Y,Z=(1～10)×10^-10m/s²时，在120阶处恢复累计大地水准面的精度为19～80 cm，恢复1.5°×1.5°累计重力异常的精度为0.3～1.3 mGal；(2)建议我国将来卫星重力测量计划中星载加速度计三轴分辨率指标设计为ACC_X=(1～5)×1010^-9m/s²，ACC_Y,Z=(1～5)×10^-10m/s²较合适，与GRACE其他载荷精度指标基本匹配.

Demonstration on the optimal design of resolution indexes of high and low sensitive axes from space-borne accelerometer in the satellite-to-satellite tracking model

The matching relationship of accuracy indexes from GRACE accelerometer,K-band ranging system and GPS receiver is demonstrated by numerical simulation based on the improved energy conservation principle. The results show:Firstly,cumulative geoid height error comes to 19～80 cm and 1.5°×1.5° cumulative gravity anomaly error is at the level of 0.3～1.3 mGal at degree 120,when the resolution of accelerometer is designed as ACC_X=(1～10)×10~(-9) m/s~2 and ACC_(Y,Z)=(1～10)×10~(-10)m/s~2combined with other payloads with same accuracy indexes of GRACE; Secondly,it is appropriate to set the three-axis resolutions of accelerometer as ACC_X=(1～5)×10~(-9) m/s_2,ACC_(Y,Z) =(1～5)×10~(-10) m/s~2 in the future satellite gravity measurement in China,which basically matches with GRACE other payloads.