扩跳频测控系统中非相干测速技术的实现

Realization of Non-coherent Velocity Measurement Technology in DS/FH Hybrid Spread Spectrum System

扩跳频测控系统具备较强的链路抗干扰能力、信息抗截获能力,已成为下一代航天测控系统的主要技术体制。针对上下行链路载波频率不断跳变使得载波相位不再连续,从而影响测速精度等问题,提出了一种航天扩跳频测控系统中非相干测速的方法,并在此基础上研究了系统中各误差源引入的随机误差,以跟踪环路引入的测量误差作为重点,进行了深入的分析及定量计算。结果表明,扩跳频测控系统的测速误差主要来源于环路热噪声引入的测速误差,测速精度与相干测控体制的测速精度相当。

The DS/FH hybrid spread spectrum system with strong capability against interference and information interception has become the main technical system of the next generation of aerospace TT&C system.The continuous hopping of the uplink and downlink carrier frequency makes the carrier phase no longer continuous,which will affect the velocity measurement accuracy.The basic principle of the non-coherent velocity measurement technology in DS/FH hybrid spread spectrum system is introduced.And on this basis,the random errors in the system are studied.Among them,the measurement error introduced by the tracking loop is taken as the focus for analysis and calculation.The results show that the velocity error of the system mainly comes from the loop thermal noise.The velocity measurement accuracy is consistent with the coherent velocity measurement technology.Therefore,the study of non-coherent velocity measurement technology has certain engineering value.