Error correct formulae of low signal to noise ratios measurement are derived on a spectrum analyzer, the experiment results are reported to verify the correctness of theory calculation.
导出了频谱仪测量低信噪比时的误差修正公式，并用实验结果验证了理论计算的正确性。
This paper discusses the cause of keyway symmetry error produced and test method and approaches to related calculating formulae.
论述了键槽对称度误差的产生原因以及检测方法，并对有关计算公式进行了探讨。
This paper deduces elevation error estimating formulae of the satellite photogrammetry, which is concerned with elements of exterior orientation that measured by spaceborne sensors.
本文推导了星载测定外方位元素参与下，无地面控制点卫星摄影测量高程误差估算公式。
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