摘要
针对在高动态环境直接扩频系统伪码延时测量所遇到的问题 ,分析了多普勒频移对伪码延时的影响 .利用扩展卡尔曼算法 (EKF)对高动态直接扩频信号的载波相位和频率进行了估计 ,并利用载波辅助技术测量载波相位的变化值来校正伪码延时环 ,减小多普勒频移对伪码延时的影响 ,得到了精确的延时估计值 。
The problems met in high dynamic environment during direct spread spectrum system measuring pseudo random (PN) code delay are analyzed, and the effect of Doppler frequency shifted on PN code delay is studied emphatically. Carrier phase and frequency of high dynamic direct spread spectrum signal are estimated through extended Kalman filter (EKF) algorithm. The PN delay loop is adjusted through measuring the varied value of carrier phase with carrier aiding technology. The effect of Doppler shift on PN code delay is reduced through carrier aiding technology. The precise delay estimation is obtained. The dynamic tracking performance of the PN delay loop is improved.
出处
《北京航空航天大学学报》
EI
CAS
CSCD
北大核心
2000年第2期129-132,共4页
Journal of Beijing University of Aeronautics and Astronautics
基金
中国工程物理研究院科学技术基金资助项目!(96040530)
关键词
锁相环
载波
扩频系统
高动态环境
伪码延时
phase locked loops
pseudorandom codes
estimations
carrier aiding
high dynamic environment
PN code delay
