归化投影改正对CPⅢ控制网精度影响分析  

Effect analysis of naturalization projection correction on the accuracy of CPⅢ control network

作　　者：杨雪峰[1] 刘成龙[1] 刘胜[1] 

机构地区：[1]西南交通大学地球科学与环境工程学院,四川成都610031

出　　处：《铁道科学与工程学报》2015年第1期35-39,共5页Journal of Railway Science and Engineering

基　　金：中央高校基本科研业务费专项资金资助项目(SWJTU12BR014/SWJTU12ZT07);国家自然科学基金资助项目(51178404);"2011计划"轨道交通安全协同创新中心经费资助项目

摘　　要：针对CPⅢ控制网是否需要进行归化投影改正,以及归化投影改正数在多少时需进行改正的问题,采用模拟数据计算并统计了以一定梯度变化的归化投影改正数对CPⅢ网约束平差后的精度影响情况;研究结果表明:归化投影改正数对约束平差后的方向平差结果没有影响,对距离平差结果以及相邻点位相对精度影响较为显著,提出了当归化投影改正数在5 mm/km以下时,可不进行归化投影改正,反之则需进行归化投影改正。As to the problem that whether CPⅢ control network needs naturalized projection corrections, and when is the fight time to modify this problem under the number of naturalized projection corrections, simulated data was adopted to calculate and count the effect of naturalization and projection on CPⅢ Network＇ s accuracy after the adjustment. The results show that naturalization projection correction has no effect on the adjustment of direction results after constrained adjustment, while the impact of the adjustment of the distance and adjacent points is more significant. In this case, an conclusion was made that when the naturalization projection correction is below 5mm/kin, the effect can be neglected; otherwise the results need to be refined with naturalized projec- tion correction.

关 键 词：高速铁路 归化投影 CPⅢ控制网 精度 

分 类 号：P224[天文地球—大地测量学与测量工程]