北斗二号B1信号捕获方法研究  

Research of BD-B1 Signal Acquisition

作　　者：袁先举 丁召[1] 卢艳娥[2] 袁美桂 郭之亨 

机构地区：[1]贵州大学大数据与信息工程学院,贵州贵阳550025 [2]中国科学院重庆绿色智能技术研究院北斗导航中心,重庆400714 [3]空军工程大学信息与导航学院,陕西西安710043

出　　处：《电视技术》2015年第21期69-72,81,共5页Video Engineering

基　　金：中国科学院2014年度"西部之光"人才培养计划-西部博士资助项目

摘　　要：为了缩短北斗B1信号的捕获时间,提高多普勒频率和码相位的估计精度,针对北斗NH码对差分相干累积值的影响,改进了广义差分相干累积捕获方法,并采用二次频率-码相位捕获法来提高载波多普勒频率和码相位的估计精度。理论分析与仿真实验表明,改进的广义差分相干累积法能够克服NH码的影响。用4个1 ms的相干累积值,改进的广义差分法可成功捕获信噪比为-27 d B的信号。最后,用实测的北斗数据验证了算法的正确性。In order to shorten the time of BD-B1 signal acquisition and improve the estimation precision of Doppler frequency and code phase under cold start condition. The generalized differential coherent accumulation method for capturing improved for the influence of Beidou NH code of divided into coherent accumulation value, and the second frequency and code phase acquisition method are used to improve the estimation accuracy of the carrier Doppler frequency and code phase. Theoretical analysis and simulation results show that the improved generalized differential coherent accumulation method can overcome the influence of NH codes, with four 1 ms coherent accumulation value, combined with the improved generalized difference method, could successfully acquire signal for SNR of-27 dB. Finally, the compass measured data is used to demonstrate the validity of the algorithm.

关 键 词：北斗信号捕获 NH码调制 广义差分相干累积 二次捕获 

分 类 号：TN927.23[电子电信—通信与信息系统]