利用仿真方法研究三频信标技术

为了探究三频信标反演高精度电离层电子浓度总含量（total electron content, TEC）的理论过程并分析不同观测误差对反演精度产生的影响，通过仿真卫星信号多普勒频移的方法来进行三频信标技术反演TEC的研究.通过已知的卫星轨道坐标、接收站坐标、卫星高度角与电离层背景信息，利用信号传播规律，仿真得到信号传播过程中的多普勒频移信息，解算出相对TEC；再利用多站法估计相位积分常数，解算双频绝对TEC；而后利用多普勒相移小数部分与三频相位积分常数结合，解算高精度三频TEC.将反演的三频TEC值与先验背景电离层TEC值进行比对，在6°观测误差的情况下，三频反演的TEC差值相对平均值在4.5%以内，相对RMS在6%以内,结果表明三频信标技术可以有效提高TEC反演精度.

Research on tri-band beacon technology by simulation method

In order to explore the theoretical process of high-precision ionospheric TEC inversion with tri-band beacon and analyze the influence of different observation errors on the inversion accuracy, this paper studies total electron content(TEC) inversion with tri-band beacon technology by simulating the Doppler frequency shift of satellite signal. Through the known satellite orbit coordinates, receiving station coordinates, satellite altitude angle and ionospheric background information, the Doppler frequency shift information in the signal propagation process is simulated using the signal propagation law, and the relative TEC is calculated; then, the phase integral constant is estimated by the multi-station method, and the dual-band beacon absolute TEC is calculated; then, the fractional part of Doppler phase shift is combined with the tri frequency phase integral constant to solve the high-precision tri-band beacon TEC. Comparing the inversion tri frequency TEC value with the prior background ionospheric TEC value, under the condition of 6° observation error, the relative TEC D-value means of tri-band beacon TEC inversion is within 4.5%, and the relative RMS is within 6%, the results show that tri-band beacon technology can effectively improve the inversion accuracy of TEC.