【作者】 郭黎利；

【导师】 张曙；

【作者基本信息】 哈尔滨工程大学 ， 通信与信息系统， 2005， 博士

【摘要】 本文主要针对需要同时进行扩频通信和对待测物体进行定位这一特殊应用场合,设计一种能够满足系统要求的通信速率、测距量程和测距精度的复合式无线通信系统。在已有定位系统和扩频通信系统相关技术基础上,提出了一种全新结构的复合系统。根据不同的应用需求和信道环境,对复合系统链接序列的内部序列进行了甄选,设计了复合系统的3种工作模式,即基于m_W序列的复合系统、基于完备互补序列的复合系统和基于修正互补序列的复合系统。 在基于m_W序列的复合系统的性能分析中,重点对Walsh序列的序率与m_W序列相关特性,m_W序列、m序列和Walsh序列相关特性这两个方面进行了分析。在m_w复合系统框架的基础上,应用二元互补序列、完备互补序列和修正互补序列作为链接序列的内部序列,并构建了基于完备互补序列的复合系统和基于修正互补序列的复合系统。对这两种基于互补序列的复合系统抑制干扰和噪声的性能进行了分析,论证了基于修正互补序列的复合系统在抑制干扰,尤其是多径干扰方面的技术优势。 本文利用直扩信号的循环相关特性,应用循环互相关(CCC)算法作为链接序列内部序列的捕获算法、系统分析(ROTH)算法作为链接序列外部序列的捕获算法,以提升复合系统TDOA估计的精度和稳健性。 本文利用链接序列特殊的结构,提出了一种具有快速捕获能力的双级序列捕获的概念。针对不同构造的链接序列,提出了“匹配滤波+序列估计”和“匹配滤波+滑动相关”两种模式的双级序列捕获算法,并对序列捕获算法的准确度和稳健性进行了深入的仿真分析。 在复合系统硬件平台实现方案方面,依据复合系统需要庞大计算能力的需求,提出了一种以多DSP为核心的并行处理系统的实现框架。更多还原

【Abstract】 A novel kind of complex system which can realize location and spread spectrum communication simultaneity is proposed in order to meet the location and communication on efficiency and location precision as well as location scope. According to the different applying occasions and communication channels, this paper designs three kinds of complex systems that are m_W sequence complex system、 ccs complex system and mccs complex system which selections of inside sequence are different.The relationship between m_W sequence correlation and Walsh sequence rate and the correlation performance comparison between m_W sequence、 m sequence and Walsh sequence are emphasized in the basis of the performance analysis of m_W sequence complex system. The ccs complex system and mccs complex system which selected ccs and mccs as the inside sequence respectively are proposed. The performance of suppression interference and noise is analyzed mostly, that proved the outstanding performance of mccs complex system to suppress the multi-path interference.The complex system applies CCC algorithms to capture the inside sequence and ROTH algorithms to capture the outside sequence using the DS clc -correlation characteristic in order to improve the precision and robustness of TDO A estimation.A novel acquisition algorithm (two-step acquisition algorithm) is proposed because of the special configuration of the multi-sequence. The match filter plus sequence estimation mode and match filter plus glide correlation mode are applied to capture the different multi-sequence. At the same time, the performance of the algorithm is analyzed.According as the demand of complex system, this paper designs a feasible implement project that is multi-DSP scheme.更多还原