【摘要】 提出了一种通用意义上的全球定位系统(GPS)信号多普勒频移估计方法.采用几何标量分析方法,建立了地心地固坐标系(ECEF)中GPS信号多普勒频移分析模型,计算了卫星可见地心角、卫星轨道角速度和卫星可见区间,推导并分析了多普勒频移关于接收机最大可见仰角、卫星轨道角速度和卫星可见时刻开始所经历的时间等参数的变化规律.研究表明,该模型适用性和准确性高,可以满足辅助全球定位系统(AGPS)终端侧精确估计多普勒频移参数的要求.更多还原

【Abstract】 A global positioning system(GPS) Doppler frequency shift estimation method in earth centered earth fixed(ECEF) frame was proposed.A GPS Doppler model was constructed by using geometric scalar analytic approach, considering the fact that observer is not necessarily on the ground trace of the satellite.In addition to the modeling and computation of orbital angular velocity,visible window of satellite,and the maximum elevation earth-centered angle,Doppler’s characterization with regard to the observing time was deduced and analyzed.Applications in real time Doppler frequency shift related parameters estimation on assisted GPS(AGPS) receiver verify the feasibility and performance of the presented method.更多还原