火星电离层无线电掩星探测仿真研究  

Simulation of the Mars Ionosphere Radio Occultation Experiments

作　　者：胡雄[1] 吴小成[1] 宫晓艳[1] 王鑫[1] 徐轻尘[1] 

机构地区：[1]中国科学院空间科学与应用研究中心,北京100190

出　　处：《天文学报》2009年第3期301-311,共11页Acta Astronomica Sinica

基　　金：中国科学院知识创新工程重要方向性项目(KJCX2-YW-T13-2);国家自然科学基金(40774087)共同资助

摘　　要：对中俄联合火星星—星电离层掩星技术体制进行了分析和介绍,采用三维射线追踪方法对电离层掩星事件的电波观测值进行了模拟计算,并利用模拟的掩星观测数据进行了电子密度廓线反演,结果说明仿真算法可靠。利用仿真的方法,分别对掩星电波相位观测误差和卫星轨道误差等带来的反演误差进行了个例计算和分析,结果得到:5%周的相位测量误差对白天电离层掩星探测结果的影响可以忽略,而夜间电子密度测量的绝对误差小于4×10~8m^(-3);卫星轨道误差对掩星的主要影响是导致电离层高度抬升或下降。结果表明,中俄联合火星电离层掩星探测技术体制先进,可望获得高精度的电子密度廓线;其技术体制也可以用于月球电离层环境的探测。The Mars ionosphere radio occultation experiment between the Chinese YH-1 spacecraft and the Russian Phobos-Grunt spacecraft orbiting Mars will be the first satellite to satellite radio occultation experiment in history, which will achieve high quality ionospheric electron density profiles. The technique used in this experiment is analyzed and introduced. Simulations of the radio occultation have been completed. Forward calculations of the radio wave observable for the ionospheric radio occultation events have been done with the 3D ray tracing method and a simple Chapman ionosphere background model. The backward inversion with the forward calculated radio occultation observation data gives reliable and consistent ionospheric electron density profiles, which show the reliability of the simulation algorithms. With the simulation method, the effects of errors from the radio signal phase measurement and the orbit determination of the satellite on the inversion are analyzed in cases. Results show that phase errors of 5% circle have a negligible effect on the daytime ionosphere radio occultation, and lead to an absolute error of less than 4 ×10^8m^3 for nighttime electron density profiles. Orbit errors of the satellite mainly pose a systematic rising or descending to the ionosphere height. The above results show that Sino-Russian cooperative Mars ionosphere radio occultation experiments is expected to achieve high quality Mars ionosphere profiles. Their technique regime can be used for the lunar ionosphere exploring.

关 键 词：行星与卫星 技术 其它诸多方面 方法 其它诸多方面 

分 类 号：P185[天文地球—天文学]