期刊文献+

基于搜索范围预测的直扩系统多普勒频偏估计 被引量:2

Searching range prediction based on Doppler frequency shift estimation method in direct spread spectrum systems
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摘要 为了解决极低信噪比和高动态条件下多普勒频偏估计可靠性差的问题,提出了一种基于搜索范围预测的扩频系统多普勒频偏估计方法。该方法利用相邻接收信号之间多普勒频偏变化受限的特点,用已得到的多普勒频偏估计值来缩小后续频偏估计的搜索范围,从而提高多普勒频偏估计的可靠性。仿真结果表明:该方法可以有效地提升多普勒频偏估计的可靠性。 To improve the unreliable Doppler frequency estimation under the condition of extremely low SNR and high dynamic state,a searching range prediction method was proposed based on Doppler frequency shift estimation used in spread spectrum systems.Using Doppler frequency variation limitation over adjacent two received signals,the proposed method narrows the searching range of the later estimations from the previous estimation results,thus,enhancing the estimation reliability.Simulation results show that this proposed method can effectively increase the Doppler detection reliability.
出处 《吉林大学学报(工学版)》 EI CAS CSCD 北大核心 2014年第6期1838-1842,共5页 Journal of Jilin University:Engineering and Technology Edition
基金 高等学校学科创新引智计划项目(B08038) 国家自然科学基金项目(61301169 61201134 61371127) 新世纪优秀人才支持计划项目(NCET-12-0918 72131855) 高等学校博士学科点专项科研基金资助课题(20120203110002) 国家重大科技专项(20132X03003008-004) 综合业务网理论及关键技术国家重点实验室项目(ISN090105) 中央高校基本科研业务费专项基金项目(7214466701)
关键词 信息处理技术 极低信噪比 高动态 多普勒估计 搜索预测 information processing extremely low SNR high dynamic Doppler estimation searching prediction
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参考文献12

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