基于STK的GPS/LEO无线电掩星技术仿真研究

Simulation of GPS/LEO Radio Occultation Based on Satellite Tool Kit

GPS/LEO无线电掩星技术反演地球大气参数剖面已经具有较高的精度.国外开展了多个GPS/LEO掩星项目,但中国还尚未深入进行相关的实验,这制约了中国掩星技术的发展.本文提出基于STK进行GPS/LEO掩星技术研究的方法;根据GPS/LEO掩星的原理,推导出掩星事件发生的条件和掩星切点的计算公式;利用STK对掩星过程进行模拟,得到掩星数据.在大气球对称假设和大气模型已知的条件下,反演得到中性大气折射指数.通过比较模型和反演数据,表明反演数据精度较高,验证了利用STK模拟GPS/LEO掩星实验方法的可行性.

High precision of GPS/LEO Radio Occultation（RO） technique in atmospheric profile retrievals is achieved.There are a few of GPS/LEO RO projects abroad at present,but related in-depth experiment had not been done in China,which restricted the development of domestic RO technique greatly.Research method of GPS/LEO radio occultation based on Satellite Tool Kit（STK） is presented,and then condition of RO occurrence and formula of calculating position of tangent point are addressed according to principle of GPS/LEO radio occultation.With the criterion process of RO having been simulated by STK,the occultation data is obtained.Index of atmosphere refractivity is gained by inversion according to known atmosphere model based on the assumption of the spherical symmetric atmosphere.It indicated a better precision of inversion data through the comparison between atmosphere model and inversion data,and the feasibility of simulation of GPS/LEO RO experiment by STK is validated.