Precision is an important parameter of GPS, and error is an important factor of restriction precision.

精度是GPS的一个重要参数，而误差是制约精度的一个重要因素。

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Based on the primary quadric error metric arithmetic, combined with boundary constrained condition and normal restriction, the primary arithmetic is modified and the application scope is extended.

在二次误差度量算法的基础上，考虑边界约束条件和法向量限制，扩展了算法的应用范围。

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For the restriction of sense principle, in some special cases, the HMR3000 digital compass module has a great error in roll and pitch outputs.

HMR30 0 0数字罗经模块由于其测量原理的限制，在某些特殊的应用场合，横摇和纵摇输出将可能出现较大的误差。

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This restriction has been established to avoid the possibility of an accidental pointing error causing too much light to fall upon an instrument.

BBC: Close up on Mercury