两种常用鉴相器对Costas环路捕获性能的影响  

Research on the Influence of Two Phase Discriminators on Costas Capture Performance

作　　者：高亢 侯孝民 闫迪 刘燕都 赵强 张超 

机构地区：[1]装备学院,北京101416

出　　处：《无线电工程》2017年第10期34-38,44,共6页Radio Engineering

摘　　要：针对鉴相特性的固有非线性对Costas环捕获性能的影响,对2种常用的鉴相器在不同载噪比下线性区间和鉴相误差进行分析和仿真。仿真结果表明,通过鉴相增益补偿使得频率跟踪精度近似相等的情况下,只考虑线性区间和鉴相误差对捕获性能的影响,反正切鉴相器的捕获时间要比正弦鉴相器短,在捕获过程中反正切鉴相器的调整次数要少,并且有较小的调整幅度,捕获性能更好。为Costas环中鉴相器的选择提供了参考。In view of the inherent nonlinear effect of the phase discrimination characteristics on the capture properties of Costas loop,the two common phase discriminators in the linear range and phase discrimination error under different load ratios are analyzed and simulated.Simulation results show that,under the circumstances of giving approximately equal frequency tracking accuracy through phase gain compensation,and only considering the effects of linear range and phase error on the capture properties,the capture time of arc tangent phase discriminator is shorter than that of sine phase discriminator,and in the capture process the arc tangent phase discriminator has less adjustment time,a smaller phase fluctuation and better capture performance.These results provide reference for the selection of Costas loop phase discriminator.

关 键 词：COSTAS环 鉴相器 捕获性能 线性区间 鉴相误差 

分 类 号：TP319.4[自动化与计算机技术—计算机软件与理论]