基于跳频图案补偿的DS/FH混合扩频测控信号载波跟踪技术  

Carrier Tracking Aided by Hopping Patterns in Hybrid DS/FH Spread Spectrum TT&C System

作　　者：陈竹[1] 王元钦[1] 杨文革[1] 

机构地区：[1]装备指挥技术学院,北京101416

出　　处：《电讯技术》2010年第7期49-54,共6页Telecommunication Engineering

基　　金：武器装备预研基金资助项目(9140A24090608KG02)~~

摘　　要：DS/FH混合扩频测控系统的中频信号携带有多普勒频率捷变成分,这使载波跟踪环路不断切换到频率阶跃的响应状态,从而导致跟踪精度下降甚至环路失锁。为此,提出一种基于跳频图案辅助的DS/FH混合扩频测控信号载波跟踪方法,通过预知的跳频图案和当前的载体速度测量值估计出下一个跳频点引入的多普勒捷变量,并将其及时补偿到跟踪环路的NCO调整量中。Simulink建模仿真证实了该方法的有效性,在一定的跳频图案时间同步误差范围内,能达到的测量精度与非跳频系统相当。Due to the cartier frequency hopping, the intennediate frequency（IF） singal of DS/FH spread spectrum system is influenced by the Doppler frequency agile, so the tracking loop will shift to the frequency step response state ceaselessly and the loop is likely to be unlocked. To solve this problem, a cartier tracking loop aid- ed by hopping pattems is developed in this paper. By the scheduled frequency hopping patterns and the current velocity, the Doppler frequency agility in the next frequency chip is estimated and compensated to the frequency adjustment in tracking loop. Simulation results show that the method eliminates the instability resulting from car- rier frequency hopping effectively, and the resolution is similar to the no - hopping system.

关 键 词：航天测控系统 DS/FH扩频 载波跟踪 频率捷变 跳频图案补偿 

分 类 号：V556[航空宇航科学与技术—人机与环境工程]