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重力测量和气候实验卫星(GRACE)是一项专用的航天任务,它的任务目标是绘制高精度的地球引力场模型。主要的测量手段是使用双单向微波测距系统测量两颗共轨卫星间距离的变化,并通过两个单向测距系统的组合,使振荡器漂移的影响达到最小。本文使用全面的误差模型对相位测量进行了仿真。仿真结果显示,使用双单向测距系统能得到较高的测距精度。
Gravity Measurement and Climate Experiment Satellite (GRACE) is a dedicated space mission whose mission is to develop a high-precision model of the Earth’s gravitational field. The main measure is to measure the distance between two common-rail satellites using a two-way microwave ranging system and to minimize the effects of oscillator drift by combining two one-way ranging systems. This article uses a comprehensive error model to simulate phase measurements. Simulation results show that the use of double unidirectional ranging system can get a higher accuracy of ranging.