CAJ | 학술논문

针对探月飞行器月球公转轨道上的卫星导航定位问题，以高轨道飞行器卫星导航定位的研究为基础，采用多全球导航卫星系统联合定位的方法进行仿真。分析了载波功率与噪声功率密度比为15dBHz的弱信号捕获门限下，各系统联合定位时波束主瓣和旁瓣的可用性，同时对各系统联合情况下的精度因子值进行分析。仿真结果表明：当接收到的卫星天线辐射的主瓣和旁瓣信号均高于载噪比门限时，全球导航卫星系统的三系统或四系统的联合能满足实时定位条件；而旁瓣损耗不加以补偿时，接收信号载噪比低于门限并导致任意联合方式均无法完成定位。各系统联合的精度因子分析表明：单系统或双系统联合的几何精度因子变化剧烈，四系统联合相比三系统联合的几何精度因子下降16.93％；三系统联合定位方案中，美国全球定位系统、中国的北斗卫星导航定位系统与欧洲的伽利略卫星导航定位系统联合方案的几何精度因子值变化最平稳，为最佳选择。理论分析和仿真结果为探月飞行器定位技术研究和星载多系统接收机设计提供参考。
침대탐월비행기월구공전궤도상적위성도항정위문제，이고궤도비행기위성도항정위적연구위기출，채용다전구도항위성계통연합정위적방법진행방진。분석료재파공솔여조성공솔밀도비위15dBHz적약신호포획문한하，각계통연합정위시파속주판화방판적가용성，동시대각계통연합정황하적정도인자치진행분석。방진결과표명：당접수도적위성천선복사적주판화방판신호균고우재조비문한시，전구도항위성계통적삼계통혹사계통적연합능만족실시정위조건；이방판손모불가이보상시，접수신호재조비저우문한병도치임의연합방식균무법완성정위。각계통연합적정도인자분석표명：단계통혹쌍계통연합적궤하정도인자변화극렬，사계통연합상비삼계통연합적궤하정도인자하강16.93％；삼계통연합정위방안중，미국전구정위계통、중국적북두위성도항정위계통여구주적가리략위성도항정위계통연합방안적궤하정도인자치변화최평은，위최가선택。이론분석화방진결과위탐월비행기정위기술연구화성재다계통접수궤설계제공삼고。
Multi-GNSS (Global Navigation Satellite System ) united positioning was simulated based on researches of high earth orbital positioning.On the weakest signal acquisition C/N0 threshold,15dBHz,feasibility of satellite beam main lobe and side lobe receiving was analyzed,and the dilution of precision values with different GNSS system united cases were also analyzed.Simulation results show that when the receiving signal’s C/N0 of both main lobe and side lobe is larger than the threshold,3 systems united or more can satisfy positioning.When the side lobe loss isn ’t compensated,C/N0 of receiving signal is weaker than threshold so that any case of multi-system united can ’t realize positioning.Analysis of dilution of precision values shows that geometrical dilution of precision of single system and double systems united changes violently.Geometrical dilution of precision of 4 systems united decreases 16.93% than that of 3 systems united.On the condition of 3 systems united,the case of American GPS(Global Position System)united with Chinese BDS(BeiDou navigation satellite System)and European Galileo system(Galileo satellite navigation system)is best since its geometrical dilution of precision is smoother than others.Theory analysis and simulation results provide beneficial suggestions for researching of lunar explorer positioning and space borne GNSS multi-system receiver.