一种鲁棒GNSS矢量跟踪环

发布时间：2018-04-28 03:52

本文选题：全球导航卫星系统 + 矢量跟踪　；参考：《航空学报》2014年11期

【摘要】：复杂环境下导航接收机的连续可用性一直是卫星导航领域的研究重点。针对矢量跟踪环动态适应性不够和误差在通道间传播的问题,提出一种鲁棒全球导航卫星系统(GNSS)矢量跟踪环。基于各通道的伪距、伪距率和伪距加速度状态量构建扩展卡尔曼滤波器(EKF),通过灵活设置过程噪声方差阵,实现跟踪通道的耦合与解耦;采用基于极大似然估计器(MLE)的鉴别器生成码延迟和载波频率偏差观测量;利用滤波值修正并预测伪距率来控制本地数控振荡器(NCO),实现环路的闭合。仿真结果表明,本文设计的矢量跟踪环在保证环路相互辅助的基础上,避免了衰减通道误差在通道间的传播,可以对被遮挡信号保持稳定跟踪,鲁棒性优于传统矢量延迟频率锁定环。
[Abstract]:The continuous availability of navigation receivers in complex environments has been the focus of research in satellite navigation field. A robust GNSS vector tracking loop is proposed to solve the problem that the dynamic adaptability of the vector tracking loop is insufficient and the error propagates between channels. Based on the pseudo-range, pseudo-range rate and pseudo-range acceleration state of each channel, the extended Kalman filter (EKF) is constructed. The coupling and decoupling of tracking channels are realized by setting process noise variance matrix flexibly. A discriminator based on maximum likelihood estimator (MLE) is used to generate code delay and carrier frequency offset observations, and the filter value is used to modify and predict the pseudo-range rate to control the local numerical controlled oscillator (NCOO) to close the loop. The simulation results show that the vector tracking loop designed in this paper can avoid the propagation of the attenuation channel error between the channels on the basis of ensuring the mutual assistance of the loop, and can keep a stable tracking of the occluded signal. The robustness is better than the traditional vector delay frequency locking loop.
【作者单位】：第二炮兵工程大学控制工程系;中国人民解放军96317部队;驻骊山微电子技术研究所军事代表室;
【基金】：国家自然科学基金(61201120) 国家“863”计划(2010AA7010213)~~
【分类号】：TN96.1

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