| 摘要: |
| 针对锁频环与锁相环各自在载波跟踪方面的优点与不足，设计了一种基于Costas环
的锁频环与锁相环相结合的载波跟踪环路。基于锁频环与锁相环各自锁定时残余频差与残余
相差都接近于0的原因，提出了mc、mpe两个阈值，当阈值满足设定的条
件时，载波跟踪环路自适应地选择相应的工作状态。仿真结果表明，在阈值达到设定的条件
时环路能够正确地实现工作状态的转换，在多普勒频移为固定值以及阶跃函数时能进行准确
的跟踪，达到了设计目的。 |
| 关键词: 相干接收机 载波跟踪 锁频环 锁相环 |
| DOI： |
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| 基金项目: |
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| Carrier tracking based on combination of FLL and PLL |
| XU Zhi-peng,CUI Chen,YU Jian |
| () |
| Abstract: |
| A carrier-tracking loop is designed on the base of respective advantages
and disadvantages of FLL and PLL on carrier-tracking. Two thresholds(mc
and mpe) are proposed according to the reason that when FLL and P
LL catch the frequ
ency, the rest of frequency error and phase error are approximately equal to zer
o. When the two thresholds satisfy the given conditions, the loop will choose wo
rk state automatically. Simulation shows that when the two thresholds satisfy th
e given conditions, the loop can switch work state correctly, and carrier can al
l be tracked whenever the Doppler frequency is a constant value or a step equati
on of time, and the aim of design is realized. |
| Key words: 〖WT5HZ〗Key words：〖WT〗 |
