摘要
针对BDS系统中存在的模型误差对模糊度解算造成估计偏差的问题,该文提出了以最小可探测偏差(MDB)为模型误差计算有偏估计成功率对模糊度解算的正确性进行评价,并分别以码观测和相位观测进行了仿真实验,得出了存在码观测MDB和相位观测MDB等情形时的有偏估计成功率大小的规律,并与不存在模型误差时的成功率进行对比分析。鉴于GNSS定位粗差包括伪距码观测粗差和相位周跳,推导了码观测和相位观测情况下的BDS系统单频定位可靠性指标MDB和最小可探测效应(MDE),并进行了中国大陆内某地点的BDS单频定位性能的仿真模拟,着重分析了载波相位MDB与周跳之间的关系。
Due to the model error in the BDS system,deviations were produced in ambiguity resolution.Success rate was calculated with the MDB as model errors to evaluate the correctness of ambiguity resolution,and respectively taking observations of the code and phase observations simulation experiments were carried out,so the rule of biased estimation of the success rate was found in case of code MDB and phase MDB.In view of the GNSS positioning gross errors including code outliers and cycle clips,so the BDS system code observation and phase observation under single frequency positioning reliability index of MDB and MDE were deduced.Then a simulation about the performance of BDS was carried out in a place in China and it focused on analyzing the relationship between the phase MDB with clips.
出处
《测绘科学》
CSCD
北大核心
2016年第12期254-260,共7页
Science of Surveying and Mapping
基金
国家自然科学基金青年科学基金项目(41504032)
江苏省自然科学基金青年科学基金项目(BK20150175)
