北斗二号B1信号捕获方法研究

发布时间：2018-03-26 20:06

本文选题：北斗信号捕获　切入点：NH码调制　出处：《电视技术》2015年21期

【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。
[Abstract]:In order to shorten the acquisition time of Beidou B1 signal and improve the estimation accuracy of Doppler frequency and code phase, the generalized differential coherent cumulative acquisition method is improved for the influence of Beidou NH code on differential coherent accumulation. The estimation accuracy of carrier Doppler frequency and code phase is improved by using the method of quadratic frequency-code phase acquisition. The theoretical analysis and simulation results show that, The improved generalized differential coherent cumulation method can overcome the influence of NH code. With four coherent cumulants of 1 Ms, the improved generalized differential method can successfully capture signals with a signal-to-noise ratio of -27 dB. Finally, The correctness of the algorithm is verified by the measured Beidou data.
【作者单位】：贵州大学大数据与信息工程学院;中国科学院重庆绿色智能技术研究院北斗导航中心;空军工程大学信息与导航学院;
【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
【分类号】：TN967.1

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