利用它对大型工程建(构)筑物进行外部变形观测，具有精度高、工效高、所获取的数据准确可靠等优点。
It has the advantages of high precision and high work efficiency in deformation observation for large buildings and structures.
分析表明：天文找北系统结构简单，精度高，对外部误差源不敏感。
It is showed that the north-finder has simple structure, high precision, and is not sensitive to outer error sources.
然而超磁致伸缩材料本身的强非线性，受外部环境影响大，使制成的执行器开环工作精度低。
However, the giant magnetostrictive material itself has strongly nonlinear property, the influence of the external environment also made the actuators work of with low accuracy.
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