【摘要】 介绍了磁偏角的测量原理,提出了磁偏角测量过程中的3个主要误差来源,即用CTM-DI磁力仪测量的磁北方向、标志方向的误差及GPS测量的测点与标志间的方位角误差.运用误差传播定律对各方向观测的精度进行分析,并推导了磁偏角测量的中误差计算公式,在此基础上,通过实例分析了目前所进行的地磁3分量测量中磁偏角的观测精度.结合观测实践,对提高磁偏角观测精度给出了几点建议.更多还原

【Abstract】 The principle of declination surveying is introduced in this paper,the three main sources of error in the process of declination surveying are raised,they are:the Error of north magnetic direction measured by CTM-DI instrument、the Error of sign direction measured by CTM—DI instrument、and the Error of azimuth angle measured by GPS between survey point and sign.The accuracy of each direction is analyzed using law of error propagation,and the calculation formula of mean squared error of declination surveying is inferred,on this basis,the accuracy of declination surveying in the current geomagnetic three-component observations is analyzed by living example.Integrating observation practice,several suggestions are given in improving precision of declination surveying.更多还原