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中文摘要：
针对数字天顶仪原有方法计算过程复杂和计算过程中存在误差的问题,通过改变时间补偿方式和优化迭代核心,提出了一种改进的数字天顶仪定位方法。该方法在切平面中进行均值过程,消除了原方法运算中引入的误差,也避免了切平面变换和反变换的反复计算,从而大幅简化了计算流程。通过实验比较了传统方法与改进方法的计算效率和精度,结果表明：改进方法的计算效率比原方法提高了至少6倍;改进方法赤纬的计算精度比原来的15米左右提高了约1.05 m。因此,改进方法能够在一定程度上提高定位的精度。
英文摘要：
The original positioning method for digital zenith camera has the problems that its calculation process is complicated and during the process some errors are introduced. By changing the way of time compensation and optimizing the iteration core, an improved positioning method was proposed. The mean in tangent plane is calculated by this method, so it can eliminate the errors in original method. Besides,by this method, the positioning process can also be simplified by avoiding the repeated calculation of tangent transformation and inverse tangent transformation. The efficiency and accuracy of these two methods were compared through experiments. The result shows that, the efficiency of improved method is more than 6 times higher than the original one; the declination calculated by improved method is 1.05 m more accurate than the original 15 m. Therefore, compared with the original method, the positioning accuracy is improved with the improved method.
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