摘要
Cn频段是除L频段外唯一受国际电联保护的导航频段,可以通过在Cn频段开展导航业务解决目前L频段所面临的频谱拥挤和易受干扰等问题。然而,Cn频段的应用也面临着带宽受限以及缺少Cn频段星地链路测距性能验证等问题。为了解决以上问题,本文设计了余弦滚降码片成型的导航信号,以减轻对相邻业务的干扰以及滤波器群时延非理想特性引入的测距偏差。并在此基础上开展了基于星地链路的Cn频段导航信号测距性能试验。试验结果表明,Cn频段导航信号测距性能与仿真结果整体趋势一致,当载噪比从49.30 dB-Hz下降到35.88 dB-Hz,其测距性能也从0.4842 m降低到2.0310 m。
For the navigation services,the Cn band is the only priority frequency band and also protected by the ITU except for L band,thus Cn band can provide navigation services to solve problems of spectrum congestion and vulnerability to interference faced in L band.However,used Cn band for navigation still faces some problems such as limited-bandwidth and lack of satellite-to-ground link ranging performance test.To solve these problems,this paper designed the navigation signal with cosine roll-off chip forming,the purpose is to reduce interference to adjacent services and ranging bias introduced by filter with non-ideal characteristic group delay.Based on the designed signal,the Cn band navigation signal test is carried out with the satellite-to-ground link.The results show that the trend of the ranging performance by the Cn band signals is consistent with the simulation results,and while the carrier-to-noise ratio decreases from 49.30 dB-Hz to 35.88 dB-Hz,the ranging performance also dropped from 0.4842 m to 2.0310 m.
作者
陈校非
卢晓春
王雪
克兢
CHEN Xiao-fei;LU Xiao-chun;WANG Xue;KE Jing(National Time Service Center,Chinese Academy of Sciences,Xi'an 710600,China;University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of Precise Positioning and Timing Technology,Chinese Academy of Sciences,Xi'an 710600,China)
出处
《时间频率学报》
CSCD
2021年第2期132-141,共10页
Journal of Time and Frequency
基金
二代导航重大专项资助项目(ZFS19001D(03))
国家自然科学基金资助项目(E007ZK1701)。
关键词
Cn频段
测距性能
带宽受限
星地链路
Cn band
ranging performance
limited-bandwidth
satellite-to-ground link
