新型卫星导航信号接收模糊减轻技术研究

项目名称： 新型卫星导航信号接收模糊减轻技术研究

项目编号： No.61301144

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 周艳玲

作者单位： 湖北大学

项目金额： 20万元

中文摘要： 新型卫星导航信号BOC及其扩展信号广泛应用于全球导航卫星系统中，减轻BOC信号的捕获和跟踪模糊，是有效发挥其高精度和抗干扰优点的前提条件。目前关于CosBOC和ALTBOC信号的模糊减轻技术研究相对薄弱，是亟待解决关键难题。有鉴于此，本项目按照以下步骤展开:（1）针对CosBOC和ALTBOC信号，以时域码片波形最小矩形单元为基准波形，待定波形向量，构造多电平辅助参考信号，与接收信号进行互相关，避免了过度增加接收机复杂度。（2）根据接收机结构和互相关函数，提出能准确反映模糊减轻能力、捕获概率和跟踪精度的评价指标，并求出其相应的解析表达式。（3）研究多目标智能优化算法，以模糊减轻能力作为目标函数，以捕获概率和跟踪精度作为约束条件，运用多目标优化算法求解出本地多电平辅助参考波形的波形向量。本项目可解决CosBOC和ALTBOC信号的捕获和跟踪模糊，同时可保证系统性能总体最优，具有实际工程意义。

中文关键词： 全球导航卫星系统；二进制偏移载波；模糊减轻；抗多径干扰；参考信号波形

英文摘要： The new satellite navigation signals such as BOC and the extended signals are widely applied to the global navigation satellite system，mitigating or eliminating the ambiguity for BOC signals acquisition and tracking effectively is the prerequisite for exerting the inherent high accuracy and anti-multipath advantages of BOC signals.?Now the researches on mitigating or eliminating the ambiguity for the CosBOC and ALTBOC signals are relatively limited and need to be solved imminently. For this reason,the current project is carried out in accordance with the following steps.(1)For the CosBOC and ALTBOC signals, the multilevel auxiliary reference signal is constructed by choosing the minimum rectangle unit in the time domain as the reference waveform and pending the wave vector, then they are cross-correlated with the receiving signal. This method avoids excessively increasing complexity of receiver.(2)According to the receiver structure and cross-correlation function, the evaluation indexes about the ambiguity mitigating degree, probability of acquisition and tracking precision are proposed, and the corresponding analytical expressions are calculated.(3)The intelligent multi-objective optimization algorithm is investigated. The ambiguity mitigating degree is defined as the objective function and the capture probabil

英文关键词： global navigation satellite system；binary offset carrier；mitigating the ambiguity；multipath mitigation；reference waveform