高低跟踪方式卫星重力观测的状态空间描述

State Space Description of Gravimetric Satellite Observation System in High-Low Mode

当前的重力卫星任务除了本身特有的观测方式外,都采用了高低卫卫跟踪的观测方式。为研究高低卫卫跟踪观测系统的时变行为和获取重力场信息的能力,文中运用描述时变系统的状态空间模型方法,根据附加参数的类型,建立了 3种状态空间模型,并对系统的可观测性从解析法的角度进行了分析。结果表明,对于单一的高低卫卫跟踪观测系统,引力系数的可观测性实际上是不成立的。

Current and future gravity satellite missions have high low satellite to satellite tracking observation system in common. In order to study its temporal behavior and ability of acquiring information on gravity field, this paper sets up three state space model descriptions by means of the state space model method, and then analyzes the system's observability from an analytical view. Results show that the actual observability of gravitational coefficients does not exist and only linear combinations or constraints of them can be determined as for the high low satellite to satellite tracking system.