加性白噪声下基带延迟锁定环跟踪精度的计算

研究了加性白噪声下基带延迟锁定环跟踪精度的计算问题,着重讨论了积分时间和环路带宽的关系.以码延迟相关鉴别器的等效鉴相模型为基础,研究了相关器输出噪声特性及其在输入端等效噪声的特性,推导了线性跟踪环输出噪声方差的计算公式,并得到了积分时间和环路带宽分别起主导作用时的简化计算公式,使两种不同的结论得到了统一.

Calculation of baseband DLL tracking accuracy with additive white noise

The tracking accuracy calculation of the baseband Delay Locked Loop(DLL) in situation of additive white noise(AWN) is studied, the relationship between integral time and loop band is specially analysed. Based on the equivalent phase discrimination model of the code delay correlator, the output noise characteristic of the correlator, as well as the equivalent noise at the input terminal are researched, the calculation equation of linear tracking loop output noise variance is deduced, and the simplified equation, in which the integral time or the loop band plays a dominant role, is developed which unifies two presently controversy conclusions. Finally,comparison and analysis of results are made between this paper and corresponding references.