摘要
针对多频组合测量时实际可用组合少、组合模糊度难以正确固定等问题,提出了一种基于双频相关约束直接求解动对动北斗单频模糊度的算法,该算法在正确固定一组组合模糊度的基础上,根据B1,B2两种频率双差方程之间的相关性,利用组合模糊度直接求解单频模糊度,然后通过组合测量值的均方误差确定单频模糊度的误差范围,最后采用OVT自适应门限检验方法得到正确的单频模糊度。试验结果表明,当组合测量均方误差小于1/4波长时,该算法仅需一组组合模糊度即可正确解算出B1,B2单频模糊度,能够较好地适用于动对动高精度相对定位。
Since the number of available combinations is limited and the combined integer ambiguities are difficult to fix, an algorithm for direct calculation of BDS single-frequency integer ambiguity based on dual- frequency correlation constrains is proposed. On the premise that a combined integer ambiguity is fixed cor- rectly, the single-frequency integer ambiguity can be calculated by the agency of the fixed combined integer ambiguity according to the correlation between B1 and B2 double differential equation, then margin of error of single-frequency integer ambiguity is determined through mean square error of the fixed combined integer ambiguity. Finally, the correct single-frequency integer ambiguity can be obtained through adaptive threshold OVT test method. The experiment results reveal that, when mean square error is less than 1/4 of wavelength, the algorithm can calculate B1 and B2 single-frequency integer ambiguity correctly with only one combined integer ambiguity, which means that the proposed algorithm is suitable for kinematic to kinematic high- precision relative positioning.
出处
《电光与控制》
北大核心
2016年第11期43-46,56,共5页
Electronics Optics & Control
基金
国家自然科学基金(61273049)
关键词
北斗导航系统
动对动
双频相关
整周模糊度
BDS
kinematic to kinematic
dual-frequency correlation
integer ambiguity
