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本文根据我国西北地区,塔里木和柴达木两盆地沙漠地区所布设的一等三角锁环资料统计分析,沙漠地区旁折光属于同性折光场影响,它使得沿沙漠地区布设的一等三角锁系全向沙漠中心偏转。沙漠地区旁折光对三角锁系的方位角条件及基线条件常数项的影响表现为系统性误差。而一等三角锁系的图形条件和极条件常数项则不受旁折光影响。按照统计分布检验结果,三角形闭合差仍为随机误差,并服从正态分布,而三角锁系的观测误差却不服从正态分布。本文对沙滇地区的布设的控制网平差处理以及为提高三角锁系的精度均有一定的意义。
Based on the statistical analysis of the first-class triangular locking ring data distributed in the deserts of the two basins in Northwest China, Tarim and Qaidam, the adjacent refraction in the desert region is affected by the same-sex refraction field, which makes the first-class triangular locking system laid along the desert region Deflection to the Desert Center. The influence of the paraxial refraction on the azimuthal conditions and the baseline condition constant in the desert area is systematic error. The first triangle lock system and the conditions of a very constant condition items are not affected by the side effects. According to the results of statistical distribution test, the triangle closure error is still a random error and obeys the normal distribution, while the observation error of the triangle lock system does not obey the normal distribution. This article has some significance to the adjustment of the control network and the improvement of the precision of the triangle lock system in the Sha-Dian region.