基于时间相对定位理论的周跳探测方法

提出了一种有效的用于高精度GPS定位或导航的周跳探测方法,该方法基于动态高采样率的假设,则时间单差观测值中的各种误差很小以至可以忽略不计,且模糊度参数值应当为零,如果发生周跳,模糊度参数的估值就是周跳,所以周跳可作为未知参数加到时间相对定位方程中进行估计.因为时间单差观测值是由同一接收机在不同位置不同历元获得的观测值,如果时间单差点位方程如同传统测站单差方程那样线性化,将导致设计矩阵秩亏,为获得稳定的线性化方案,分析了时间相对定位方程,引入了虚观测值的概念.车载试验数据处理结果表明,基于时间相对定位理论的周跳探测方法可以探测到一周量值的周跳.结果还显示:如果2颗卫星过于接近,其对站星几何图形的影响是等价的,从而给周跳探测带来困难甚至可能得出错误结论;不同卫星发生的周跳也通过站星几何图形影响周跳探测.     

Interior-point algorithm based on general kernel function for monotone linear complementarity problem

A polynomial interior-point algorithm is presented for monotone linear complementarity problem (MLCP) based on:a class of kernel functions with the general barrier term, which are called general kernel functions. Under the mild conditions for the barrier term, the complexity bound of algorithm in terms of such kernel function and its derivatives is obtained. The approach is actually an extension of the existing work which only used the specific kernel functions for the MLCP.