Precise Estimation Method of Pseudo Random Code Delay of Spread Spectrum System in High Dynamic Environment
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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,提高了伪码延时锁定环的动态跟踪性能.Abstract: 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.
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Key words:
- phase-locked loops /
- pseudorandom codes /
- estimations /
- carrier aiding /
- high dynamic environment /
- PN code delay
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