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从Haselgrove和Budden方程出发 ,模拟了GPS信号在电离层中的传播过程。利用GPS/MET实验中 5组GPS和LEO卫星的实际轨道 ,分别模拟了无LEO卫星轨道扰动和有轨道扰动情况下的GPS信号在电离层中的传播 ,并生成了对应的电离层延迟量。以同步生成的模拟精度序列为参照 ,就掩星观测中电离层延迟对LEO卫星轨道误差的响应程度进行了估计和分析。初步结果显示 :在掩星观测中 ,电离层延迟对LEO卫星轨道误差的响应比中性层延迟要弱得多 ,这可能同采用了电离层掩星观测的采样频率比中性层采样频率低两个数量级的技术手段有关。
Based on the Haselgrove and Budden equations, the propagation of GPS signals in the ionosphere is simulated. Based on the real orbits of GPS and LEO satellites in GPS / MET experiment, the propagation of GPS signals in the absence of LEO satellite orbit disturbance and orbit perturbation is simulated respectively and the corresponding ionospheric delay is generated. Taking the simulated precision sequence generated synchronously as reference, the response of ionospheric delay to LEO satellite orbit error was estimated and analyzed in the occultation observation. The preliminary results show that in the occultation observation, the ionospheric delay has a much weaker response to the LEO satellite orbit error than that of the neutral layer, which may be the same as that of using the sampling frequency of the ionospheric occultation observation Two orders of magnitude technical means.