基于铱星机会信号的定位技术
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摘要
全球导航卫星系统(GNSS)到达地球表面的信号弱,易受干扰,并且需要投入大量的基础设施,而机会信号可有效弥补这方面的不足。针对目前陆基机会信号(广播、数字电视和移动基站等)存在的覆盖性、可用性限制,提出了利用铱星系统实现天基机会信号定位。通过对铱星信号的通信体制进行深入研究,建立了瞬时多普勒定位数学模型,提出了利用铱星信号的单音信号获取多普勒频率信息,并结合轨道预测模型计算的卫星轨道信息实现铱星定位的方法。实测数据验证结果表明,利用实际铱星信号能够实现精度优于200 m的定位。研究成果对基于机会信号的定位技术的理论研究及应用具有参考意义。
The global navigation satellite system( GNSS) has a number of disadvantages such as weak signal strength on the ground,high infrastructure requirement and easy to be interfered,while signals of opportunity can make up these shortages. Space-based signals of opportunity positioning based on IRIDIUM is implemented for insufficiency of the coverage and availability of ground-based signals of opportunity such as FM,DTV and mobile base station. This paper realizes the function of positioning based on IRIDUM through combining Doppler shift information which is acquired with the tone signal of IRIDIUM signal and orbital information of satellite calculated from orbit prediction model after establishing mathematical model of instantaneous Doppler positioning by analyzing the communication system of IRIDIUM. The experimental results based on actual signal show that the positioning accuracy can reach better than 200 m. The research of this paper is significant in theoretical research and practice application of positioning technology based on signals of opportunity.
The global navigation satellite system( GNSS) has a number of disadvantages such as weak signal strength on the ground,high infrastructure requirement and easy to be interfered,while signals of opportunity can make up these shortages. Space-based signals of opportunity positioning based on IRIDIUM is implemented for insufficiency of the coverage and availability of ground-based signals of opportunity such as FM,DTV and mobile base station. This paper realizes the function of positioning based on IRIDUM through combining Doppler shift information which is acquired with the tone signal of IRIDIUM signal and orbital information of satellite calculated from orbit prediction model after establishing mathematical model of instantaneous Doppler positioning by analyzing the communication system of IRIDIUM. The experimental results based on actual signal show that the positioning accuracy can reach better than 200 m. The research of this paper is significant in theoretical research and practice application of positioning technology based on signals of opportunity.
引文
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[13] KAY S M. Fundamentals of statistical signal processing:Estimation theory[M]. Upper Saddle River:Prentice-Hall Inc.,1993:193-197.
[14]张守信. GPS卫星测量定位理论与应用[M].长沙:国防科技大学出版社,1996:86-87.ZHANG S X. Theory and application of GPS satellite measurement and positioning[M]. Changsha:National University of Defense Technology Press,1996:86-87(in Chinese).
[15]王萌,马利华,张丽荣,等.区域定位系统中高程辅助三星定位算法[J].上海交通大学学报,2012,46(10):1647-1652.WANG M,MA L H,ZHANG L R,et al. Three-satellite positioning algorithm with altitude aiding for regional navigation satellite system[J]. Journal of Shanghai Jiaotong University,2012,46(10):1647-1652(in Chinese).
[2] LAWRENCE D,COBB H S,GUTT G,et al. Test results from a LEO-satellite-based assured time and location[C]∥Proceedings of the 2016 International Technical Meeting of the Institute of Navigation,2016:125-129.
[3] JOERGER M,GRATTON L,PERVAN B,et al. Analysis of IRIDIUM-augmented GPS for floating carrier phase positioning[J]. Journal of the Institute of Navigation,2010,57(2):137-160.
[4] BLOOM J. Eccentric orbits:The Iridium story[M]. Atlanta:Atlantic Monthly Press,2016:18-20.
[5] PRATT S R,RAINES R A,FOSSA C E,et al. An operational and performance overview of the IRIDIUM low earth orbit satellite system[J]. IEEE Communications Surveys and Tutorials,1999,2(2):2-10.
[6] PRATT S R,RAINES R A,GUNSCH G H,et al. An overview of the IRIDIUM(R)low earth orbit(LEO)satellite system[C]∥National Aerospace and Electronics Conference. Piscataway,NJ:IEEE Press,1998:152-159.
[7] ICAO. Manual for ICAO aeronautical mobile satellite(ROUTE)service. Part2-Iridium. Draft v4. 0[Z]. Montreal:ICAO,2007:9-12.
[8]闵士权.卫星通信系统工程设计与应用[M].北京:电子工业出版社,2015:352-361.MIN S Q. Satellite communication system engineering design and application[M]. Beijing:Electronics Industry Press,2015:352-361(in Chinese).
[9] SHAHRIAR C M R. A scheme to mitigate interference from Iridium satellite downlink signal captured by omnidirectional antenna array[C]∥IEEE Antennas and Propagation Society International Symposium. Piscataway,NJ:IEEE Press,2008:1-4.
[10] VAN DIGGELEN F. A-GPS:Assisted GPS,GNSS,and SBAS[M]. Boston:Artech House,2009:261-264.
[11] COBB S,LAWRENCE D,GUTT G,et al. Differential and rubidium disciplined test results from an Iridium-based secure timing solution[C]∥International Technical Meeting of the Institute of Navigation. Manassas:ION,2017,2:1111-1116.
[12] BOYCE III W H. Examination of NOARD TLE accuracy using the Iridium constellation[J]. Advances in the Astronautical Sciences,2005,119(2):2133-2141.
[13] KAY S M. Fundamentals of statistical signal processing:Estimation theory[M]. Upper Saddle River:Prentice-Hall Inc.,1993:193-197.
[14]张守信. GPS卫星测量定位理论与应用[M].长沙:国防科技大学出版社,1996:86-87.ZHANG S X. Theory and application of GPS satellite measurement and positioning[M]. Changsha:National University of Defense Technology Press,1996:86-87(in Chinese).
[15]王萌,马利华,张丽荣,等.区域定位系统中高程辅助三星定位算法[J].上海交通大学学报,2012,46(10):1647-1652.WANG M,MA L H,ZHANG L R,et al. Three-satellite positioning algorithm with altitude aiding for regional navigation satellite system[J]. Journal of Shanghai Jiaotong University,2012,46(10):1647-1652(in Chinese).
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