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引力测量和气候试验(GRACE)飞行任务将在为期5年的任务周期内每隔15～30天产生一个地球引力场的新模型,其模型精度是史无前例的。GRACE任务要求两颗卫星间隔100～500km,以一前一后的队形编队飞行。该任务将采用两颗自带仪器的共轨卫星编队飞行。地球引力场的变化表现为对2颗共轨卫星轨道摄动之差。利用微米级精度的高频星间测量链路测量两颗卫星之间距离的变化。3轴加速度计的精确测量值经处理后用来消除非引力分量对星间距离变
The Gravity Measurement and Climate Experiment (GRACE) mission will produce a new model of the Earth’s gravitational field every 15-30 days over a five-year mission cycle, with unprecedented accuracy of the model. The GRACE mission requires that two satellites be separated by 100-500 km and fly in formation formations in tandem. The mission will be using two common-rail satellites with their own instruments to fly. The change of the earth’s gravitational field is manifested as the difference of the orbital perturbation of two common-rail satellites. The use of micron-precision high-frequency interstellar measurement link to measure the distance between two satellites. Accurate measurements of 3-axis accelerometer processed to eliminate non-gravitational component to the distance between the stars change