| 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。 |
| 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 |
| DOI： |
|
| 基金项目:武器装备预研基金资助项目(9140A24090608KG02) |
|
| Carrier Tracking Aided by Hopping Patterns in Hybrid DS/FH Spread Spectrum TT&C System |
| CHEN Zhu,WANG Yuan-qin,YANG Wen-ge |
| (Academy of Equipment Command & Technology, Beijing 101416, China) |
| Abstract: |
| Due to the carrier frequency hopping, the intermediate frequency（IF） singal of
DS/FH
spread spectrum system is influenced by the Doppler frequency agile, so the trac
king loop wil
l shift to the frequency step response state ceaselessly and the loop is likely
to be unlocked. To solve this problem,a carrier tracking loop aided by hopping p
atterns is developed i
n this paper. By the scheduled frequency hopping patterns and the current veloci
ty, the Doppler frequency agility in the next frequency chip is estimated and co
mpensated to the frequency adjustment in tracking loop. Simulation results show
that the method eliminates the instability resulting from carrier frequency hopp
ing effectively, and the resolution is similar to the no-hopping system. |
| Key words: aerospace TT&C system DS/FH spread spectrum car
rier tracking frequency agility aided by hopping pattern |
