Multipath sensitivity and carrier slip tolerance of an integrated Doppler DGPS navigation algorithm

IEEE Symposium on Position Location and Navigation. A Decade of Excellence in the Navigation Sciences Pub Date : 1990-03-20 DOI:10.1109/PLANS.1990.66239

J. Sennott, J. Spalding

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引用次数: 7

Abstract

Integrated Doppler techniques are potentially very useful for such critical real-time DGPS (differential Global Positioning System) applications as river and harbor ship steering, aircraft precision approach, and autonomous land vehicle guidance. Offering high measurement precision and reduced sensitivity to multipath, the integrated Doppler observable can be introduced into the user navigation algorithm in several ways. The approach proposed features: a state variable model for code multipath, code-carrier ambiguity, and code-carrier ionospheric delay offset rate; delta-range, integrated Doppler and code pseudorange combined in an optimal manner during new satellite reception; a state variable and covariance model implemented for DGPS reference station extrapolated corrections; and real-time correction of large cycle-slip events. The interaction of filter modules is discussed. A filter covariance model is utilized to assess the impact of multipath strength and correlation time.<>

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集成多普勒DGPS导航算法的多径灵敏度和载波容差

集成多普勒技术对于关键的实时DGPS(差分全球定位系统)应用非常有用，如河流和港口船舶转向、飞机精确进近和自主陆地车辆制导。集成多普勒观测具有较高的测量精度和较低的多径灵敏度，可通过多种方式引入用户导航算法。该方法提出的特点是:一个码多径、码载波模糊性和码载波电离层延迟偏移率的状态变量模型;在新卫星接收中以最佳方式组合delta距离、综合多普勒和码伪距;DGPS参考站外推修正的状态变量和协方差模型;以及大周期滑动事件的实时校正。讨论了滤波器模块间的相互作用。利用滤波器协方差模型来评估多径强度和相关时间的影响

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IEEE Symposium on Position Location and Navigation. A Decade of Excellence in the Navigation Sciences

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