借助TADT技术对中继卫星实现高准确的非相干多普勒跟踪

Highly Accurate Noncoherent Doppler Tracking based on TADT Technique

用非相干多普勒跟踪系统取代相干多普勒跟踪系统是可能的,只需消除其振荡器频率漂移对测速的有害 影响即可。TADT技术能使之达到相干系统的准确度。文中介绍TADT方法的数学原理及其在TDKSS网中的应用。结 论认为,TADT方法是解决非相干多普勒跟踪系统高精度和高可靠性这一矛盾的有效方法,从而使航天器的多普勒跟踪 技术取得突破性进展。

The synchronous satellite is a important part of the TDRSS network.and its velocity accuracy has a great influence on velocity accuracy of user spacecrafts.Generaly,the coherent Doppler tracking system is employded due to its high tracking precision.But it has complex transponder configuration and will give place to the noncoherent Doppler tracking system in which the impact of the frequency drift of onboard oscillater on its velocity accuracy could be eliminated in the future.Recently,a method that is colled TADT (Telemetry Aided Doppler Tracking) is provided.This method can allow to use the noncoherent Doppler tracking system with the same Doppler estimate accuracy as the coherent Doppler tracking system has.In this paper the basic principle of TADT method is described.