多通道联合控制数控振荡器的环路设计  

Loop design of numerically controlled oscillator driven by multichannel united data

作　　者：王前[1,2] 胡彩波 

机构地区：[1]北京航空航天大学仪器科学与光电学院,北京100191 [2]北京卫星导航中心,北京100094

出　　处：《中国惯性技术学报》2015年第4期483-488,共6页Journal of Chinese Inertial Technology

基　　金：国家自然科学基金项目(41474027)

摘　　要：信号跟踪是卫星导航接收机的核心处理技术,提升跟踪处理性能可弥补卫星导航易受干扰和遮挡的固有不足,具有重要的应用前景。在分析信号跟踪和测量的基本原理上,利用误差估计关系建立了定位域和信号域的物理联系桥梁。通过抽象的跟踪环路传输模型,归纳出提升环路性能的技术途径,改变了传统环路相互独立的设计思路,利用加权最小二乘算法设计了多数据源联合控制数控振荡器的矢量化环路跟踪算法,并从理论和仿真实验两方面对算法的性能进行了全面的对比分析。结果表明,该方法在与普通接收机处理复杂度相当的情况下,可提高环路在弱信号环境下的处理能力,多通道联合辅助某一弱信号通道时可提高6 d B的增益,多通道联合跟踪相对比各通道独立工作可提高3 d B的增益。Signal tracking is the main processing technology of GNSS（Global Navigation Satellite System） receiver. Improving the receiver＇s tracking ability could make up the inherent weakness of GNSS＇s being liable to the jamming and shield. Based on the principle of signal tracking and measuring, the connection bridge between position and signal field is built by evaluating the measurement errors. The technique solutions of boosting the loop performance are concluded by analyzing the abstract loop transmission model. The classical design idea that the channels are mutual independent are changed, and the vector loop tracking algorithm is proposed based on the NCO（Numerically Controlled Oscillator） controlled by multichannel data in the weighted least square algorithm. The new method is analyzed by theory and simulation tests. The test results show that this method can improve the processing ability of faint signal, the tracking sensitivity is increased by more than 3 d B compared with the common receiver with the same complexity, and the gain is increased by 6 d B when the channel of weak signal is assisted by the other channels of strong signals.

关 键 词：卫星导航 数控振荡器 最小二乘 信号跟踪 

分 类 号：U666.1[交通运输工程—船舶及航道工程]