摘要
一般较为简易的伪码测距,测距误差通常不小于系统的时钟周期。本文在简易伪码测距系统中引入了GPS的码环鉴别器和码环滤波器。不同于GPS的是,对码环滤波器带来的滞后效应作了深入的分析,找到了规律,估计和补偿了滞后效应带来的误差,大幅度地提高了伪码测距精度。
In ordinary spread spectrum systems, the ranging precision is not higher than a period of system′s clock. This paper introduces a scheme that uses GPS′S lead-leg discriminator with normalized envelope and loop filter in these systems.After the analysis of the lag effect′s error of loop filter,the law is found and the error is estimated and compensated,thus to greatly improve the ranging precision.
出处
《电讯技术》
2005年第1期103-106,共4页
Telecommunication Engineering
关键词
伪码测距
测距精度
帧参考时标
码环鉴别器
码环滤波器
滞后效应
Psudo code ranging
Ranging precision
Mark of timing reference
Lead-leg discriminator with normalized envelop
Loop filter
Lag effect
