为了提高系统的运算精度和速度，采用定点DSP芯片TMS320 VC 5402进行计算和控制，以快速准确测出真北方位角。
In order to improve systematic operation precision and speed, adopt fixed DSP chip TMS320VC5402to calculate and control, and measuring northern direction Angle corner accurately fast.
研究方法：以南梁-太行山隧道洞外精密控制测量复测为例，通过比较分析同名基线的距离和方位角，考察两次结果对隧道贯通误差的影响。
The discussions are made in this paper on implement of repetition survey and the comparison of corresponding baselines with original baseline in the data processing.
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