摘要
针对地基伪卫星系统接收信号接收载噪比和频率激励特点,分析了三阶锁相环的载波跟踪能力,在高动态条件和接收机接近离去伪卫星等过程中,有限的载噪比和接收信号的高阶频率激励将导致三阶锁相环失锁。为提高伪卫星系统接收机在高动态条件下的载波跟踪能力,提出一种惯导/伪卫星接收机深耦合载波跟踪方法,基于惯导输出的高频定位、速度信息和伪卫星位置信息估计接收信号的频率偏移并进行补偿。仿真实验表明,接收机在不高于10 g加速度直线运动下接收邻近伪卫星信号,深耦合算法具有相对更为稳定和精确的载波跟踪能力。
Considering the characteristics of terrestrial pseudolite receiver in terms of CNR（ Carrier to Noise Ratio） and frequency excitation when receiving signal,the analysis of the carrier tracking performance of third order PLL is made,it might suffer from loss of lock due to the limited CNR and the high-order frequency excitation of received signal. To improve the carrier tracking performance of pseudolite receiver under a high dynamic condition,an INS / pseudolite deeply coupled carrier tracking approach is proposed which can estimate and compensate the frequency offset of received signal based on the high-frequency positioning and velocity information provided by the INS and the pseudolite position information. A simulation experiment shows that this deeply coupled algorithm behaves more stable and accurate carrier tracking performance when the receiver moving in a rectilinear motion at an acceleration of no more than 10 g attempts to receive signals from pseudolites nearby.
出处
《无线电工程》
2016年第10期43-46,82,共5页
Radio Engineering
基金
河北省科技计划基金资助项目(14210312D
15210801D)
关键词
地基伪卫星
高阶频率激励
深耦合
频率估计
载波跟踪
terrestrial pseudolite
high-order frequency excitation
deeply coupled
frequency estimation
carrier tracking
