基于LAS码的星群多目标测控技术研究
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摘要
针对星群多目标同时测控问题,基于星群轨道根数的时延特性和多普勒频移特性分析可得,星群多目标测控的上行链路遥控与测距信号可实现S-CDMA(Synchronous Code Division Multiple Access,同步码分多址),由于星间距离较小,下行链路遥测与测距信号满足QS-CDMA(Quasi-synchronous code division multiple access,准同步码分多址)。上行链路遥控和测距信号形式设计为PCM-BPSK-CDMA(Pulse Code Modulation-Binary Phase Shift Keying-Code Division Multiple Access,脉冲编码调制-二进制相移键控-码分多址),上行链路信号采用Gold序列扩频;下行链路遥测和测距信号形式设计为PCM-BPSK-CDMA,根据总的时延差,提出下行链路采用基于等长脉冲间隔法构造的LAS(Large Area Synchronous,大区域同步)码扩频。结果表明:比特信噪比Eb/N0为10.5dB时,遥控误码率为1×10-6;Eb/N0为9.6dB时,遥测误码率为1×10-5——与达到相同误码性能的Gold序列相比有1dB改善,因此,LAS码相比于Gold码能够获得更好的误码性能。
Ground-based multi-object TT&C(Tracking,Telemetry and Command)technology for clusters of formation flying satellites is analyzed.Propagation delay and Doppler frequency shift of formation flying satellites based on satellite ephemeris orbital parameters show that the uplink tracking and ranging signal is synchronous CDMA(Code Division Multiple Access)and it is designed as the form of PCM-BPSK-CDMA(Pulse Code Modulation-Binary Phase Shift Keying-Code Division Multiple Access),which is spread by Gold sequence.The downlink telemetry and ranging signal is quasi-synchronous CDMA and is also designed as the form of PCM-BPSK-CDMA.Meanwhile,the downlink signal is spread by LAS(Large Area Synchronization)code,which is constructed by a new method of equal pulse interval according to downlink time delay error.When uplink Eb/N0is more than 10.5dB,the BER(Bit Error Rate)of tracking information is less than 1×10-6.When downlink Eb/N0is more than 9.6dB,the BER of telemetry information is less than 1×10-5,which is improved by 1dB compared with Gold sequence.The BER performance applying LAS code is better than that using Gold sequence.
Ground-based multi-object TT&C(Tracking,Telemetry and Command)technology for clusters of formation flying satellites is analyzed.Propagation delay and Doppler frequency shift of formation flying satellites based on satellite ephemeris orbital parameters show that the uplink tracking and ranging signal is synchronous CDMA(Code Division Multiple Access)and it is designed as the form of PCM-BPSK-CDMA(Pulse Code Modulation-Binary Phase Shift Keying-Code Division Multiple Access),which is spread by Gold sequence.The downlink telemetry and ranging signal is quasi-synchronous CDMA and is also designed as the form of PCM-BPSK-CDMA.Meanwhile,the downlink signal is spread by LAS(Large Area Synchronization)code,which is constructed by a new method of equal pulse interval according to downlink time delay error.When uplink Eb/N0is more than 10.5dB,the BER(Bit Error Rate)of tracking information is less than 1×10-6.When downlink Eb/N0is more than 9.6dB,the BER of telemetry information is less than 1×10-5,which is improved by 1dB compared with Gold sequence.The BER performance applying LAS code is better than that using Gold sequence.
引文
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[7]李飞龙,李志强,冯少栋,等.基于劳伦多项式的LAS码构造及性能分析[J].电讯技术,2012,52(11):1752-1757.Li Feilong,Li Zhiqiang,Feng Shaodong,et al.Construction and performance analysis of Large Area Synchronous code based on Laurent polynomial[J].Telecommunication Engineering,2012,52(11):1752-1757(in Chinese).
[8]李飞龙,李志强,朱文明,等.无多址干扰的多目标测控技术[C]∥第26届飞行器测控学术年会论文集.南京,2012:273-278.Li Feilong,Li Zhiqiang,Zhu Wenming,et al.Research of multi-objective TT&C technology without multi-user interference[C]∥Proceedings of the 26th Conference of Spacecraft TT&C Technology in China.Nanjing,2012:273-278(in Chinese).
[9]李飞龙.基于LAS码的空间多目标测控技术研究[D].南京:解放军理工大学,2013.Li Feilong.Research of multi-objective TT&C technology based on large area synchronous code[D].Nanjing:PLA University of Science and Technology,2013(in Chinese).
[10]王忠贵.交会对接任务天基双目标测控通信设计[J].飞行器测控学报,2012,31(3):1-5.Wang Zhonggui.Design of a spaced-based dual-object TT&C system for China’s first rendezvous and docking mission[J].Journal of Spacecraft TT&C Technology,2012,31(3):1-5(in Chinese).
[2]Folta D,Bristow J,Hawkins A,et al.NASA’s autonomous formation flying technology demonstration,Earth Observing-1(EO-1),N20030022777MF[R].Washington D.C.:National Aeronautics and Space Administration,2002.
[3]于志坚.载人航天测控通信系统[J].宇航学报,2004,25(3):247-250.Yu Zhijian.TT&C and communication system of Chinese manned space flight[J].Journal of Astronautics,2004,25(3):247-250(in Chinese).
[4]Stanczak S,Boche H,Haardt M.Are LAS codes a miracle[C]∥IEEE Global Telecommunications Conference.San Antonio,Texas,2001:589-593,vol.1.
[5]Lai Chen-Yan,Chu Hsiao-Chiu,Liao Shry-Sann,et al.On LA code performance analysis for LAS-CDMA communications[C]∥Proceedings of the IEEE 6th Circuits and Systems Symposium on Emerging Technologies:Frontiers of Mobile and Wireless Communication.Shanghai,2004:341-345,vol.1.
[6]林来兴.卫星编队飞行动力学仿真及其应用[J].中国空间科学技术,2005,25(2):26-33.Lin Laixing.Dynamics simulation and application of satellites formation flying[J].Chinese Space Science and Technology,2005,25(2):26-33(in Chinese).
[7]李飞龙,李志强,冯少栋,等.基于劳伦多项式的LAS码构造及性能分析[J].电讯技术,2012,52(11):1752-1757.Li Feilong,Li Zhiqiang,Feng Shaodong,et al.Construction and performance analysis of Large Area Synchronous code based on Laurent polynomial[J].Telecommunication Engineering,2012,52(11):1752-1757(in Chinese).
[8]李飞龙,李志强,朱文明,等.无多址干扰的多目标测控技术[C]∥第26届飞行器测控学术年会论文集.南京,2012:273-278.Li Feilong,Li Zhiqiang,Zhu Wenming,et al.Research of multi-objective TT&C technology without multi-user interference[C]∥Proceedings of the 26th Conference of Spacecraft TT&C Technology in China.Nanjing,2012:273-278(in Chinese).
[9]李飞龙.基于LAS码的空间多目标测控技术研究[D].南京:解放军理工大学,2013.Li Feilong.Research of multi-objective TT&C technology based on large area synchronous code[D].Nanjing:PLA University of Science and Technology,2013(in Chinese).
[10]王忠贵.交会对接任务天基双目标测控通信设计[J].飞行器测控学报,2012,31(3):1-5.Wang Zhonggui.Design of a spaced-based dual-object TT&C system for China’s first rendezvous and docking mission[J].Journal of Spacecraft TT&C Technology,2012,31(3):1-5(in Chinese).