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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第12卷    第1期    总第63期    2015年2月

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文章编号:1672-7029(2015)01-0035-05
归化投影改正对CPIII控制网精度影响分析
杨雪峰,刘成龙,刘胜

(西南交通大学 地球科学与环境工程学院,四川 成都 610031)

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。

 

关键字: 高速铁路;归化投影;CPIII控制网;精度

Effect analysis of naturalization projection correction on the accuracy of CPIII control network
YANG Xuefeng, LIU Chenglong, LIU Sheng

Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China

Abstract:As to the problem that whether CPIII control network needs naturalized projection corrections, and when is the right 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/km, the effect can be neglected; otherwise the results need to be refined with naturalized projection correction.

 

Key words: high-speed railway; naturalization projection; CPIII control network; accuracy

ISSN 1672-7029
CN 43-1423/U

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