Abstract:

Aiming at the problem of effects for spacecraft’s tracking performance due to ground station frequency standards, a Doppler velocity tracking model is established based on two-way tracking modes. The effects for Doppler tracking due to the determinative and random deviations of frequency standards are researched,  and the analysis illustrates that frequency standards imperfections caused by inaccuracies and instabilities of timing are the primary error sources for radiometric tracking. The relations of Allan variance, averaging time and round trip light time are deduced. Finally, the effectiveness is demonstrated by simulations using Rubidium, Cesium and Hydrogen atom frequency standards.