基于邻近频点插值混合扩频信号多普勒频偏估计算法  

Doppler frequency offset estimation algorithm of hybrid spread spectrum signals based on adjacent frequency point interpolation

作　　者：王东政 李双喜[2] 郑二矿 崔嵬[1] WANG Dong-zheng;LI Shuang-xi;ZHENG Er-kuang;CUI Wei(School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China;Beijing Aerospace Automatic Control Institute,Beijing 100854,China)

机构地区：[1]北京理工大学信息与电子学院,北京100081 [2]北京航天自动控制研究所,北京100854

出　　处：《沈阳工业大学学报》2020年第6期681-686,共6页Journal of Shenyang University of Technology

基　　金：国家自然科学基金项目(61701030,61672097).

摘　　要：针对直扩/跳扩混合扩频信号捕获算法中,要降低多普勒频率估计误差,但运算资源有限的问题进行了研究.采用一种基于插值预测的频率估计算法,利用不同频点之上的相关值进行多普勒频偏估计,以较低的计算量为代价,减小多普勒频率误差.在不同信噪比环境与不同接收信号多普勒频率下,对多普勒频率检测精度进行仿真.经过测试表明,该算法在信噪比不低于-23 dB时,对于直扩/跳扩混合扩频系统的多普勒频率估计误差的平均值小于20 Hz,且具有更加稳定的均方根误差,可以做到在不需要较多改变硬件的情况下,通过后期计算即可提高多普勒频率估计的精度.Aiming at the problem of reducing Doppler frequency estimation error in the case of limited computation resources,when using the acquisition algorithm of direct sequence/frequency hopped(DS/FH)hybrid spread spectrum signals,a frequency estimation algorithm based on interpolation prediction was adopted.Correlation values at different frequency points were used to estimate Doppler frequency offset to reduce the Doppler frequency error,at the expense of relatively lower computation amount.Under different signal-to-noise ratio(SNR)environments and different Doppler frequencies of received signal,Doppler frequency detection accuracy was simulated.The tests show that when the SNR is no less than-23 dB,the average Doppler frequency estimation error for DS/FH hybrid spread spectrum system is less than 20 Hz and has more stable root-mean-square errors.Doppler frequency estimation accuracy can be improved by post-computation,with no need of considerable hardware alteration.

关 键 词：混合扩频 频率估计 捕获算法 插值算法 信号检测 直接序列扩频 频点 多普勒频率 

分 类 号：TN927[电子电信—通信与信息系统]