摘要
在轨卫星受轨道摄动的影响,运行一段时间后会逐渐偏离设计轨道,导致星座结构失衡。为保持星座构型,必须实施轨道机动。但对于卫星导航系统来说,轨道机动期间卫星播发的星历参数精度下降,系统会将其置为"不可用",通知用户不要使用该卫星,尤其对于区域混合星座来说,某一颗卫星不可用所引起的位置精度因子(Position Dilution of Precision,PDOP)变化会影响用户的服务性。通过分析指定区域的PDOP值变化情况,提出了利用窗口移动方法优化选取轨道机动时间的策略,确定对指定区域影响满足要求的时间段。对BDS卫星导航系统星座进行了仿真分析,验证了结果的可行性。结果表明,该方法可有效地减少因轨道机动带来的服务区域的影响,为测控部门实际操作提供依据。
Affected by the perturbative force,the in-orbit satellites will gradually deviate from the designed orbit,resulting constel-lation structural imbalances.In order to maintain orbit constellation,orbit maneuvering must be implemented.However,the accuracy of orbit parameter broadcast by a maneuvering satellite will decline.The ground control system will set this satellite as ‘Unavailable’, informing the normal user not using this satellite.For a regional and composite constellation,one satellite being‘unavailable’ will affect the position dilution of precision （ PDOP ） , which is the important parameter used in service. By analyzing PDOP value changes in designated area,a method is proposed to optimize the selected orbital maneuvering time strategy through the window slid,and to deter-mine the minimal impact on the period to ensure the use of regional needs.Analysis of BDS constellation is done.And the results validate the feasibility,show that this method can effectively mitigate the impact of the orbital maneuvering to the service area,and provide the basis for telemetry sector practice.
出处
《无线电工程》
2014年第6期43-46,72,共5页
Radio Engineering
基金
国家863计划资助项目(2013AA122401)
关键词
系统服务性能
轨道机动
优化设计
PDOP
混合星座
system service performance
orbit maneuver
optimal design
PDOP
hybrid constellation
