初相位是指正弦量在t=0时的相位，也称初相角或初相，其单位可用弧度(rad)或度(°)表示。初相反映了交流电交变的起点，与时间起点的选择有关。初相可以是正角，也可以是负角。若t=0时正弦量的瞬时值为正值，则其初相为正角；若t=0时正弦量的瞬时值为负值，则其初相为负角。
同态处理方法还可以同时估计单一波模式的衰减、幅度和初相位；
While homomorphic processing can also be used to calculate attenuation, amplitude and phase of one mode simultaneously.
对于计算公式的准确度又作了讨论，指出了采样初相位的计算误差对冲击测量误差的计算基本没有影响。
Thus, the difficult problem concerning theoretical calculation of impulse measurement errors of digitizers is systematic solved. Calculation accuracy is also discussed.
利用恒温控制平台，通过测量干涉光电流和干涉仪两臂光电流的方法，实现了对全光纤干涉仪两臂初相位差的测量。
The initial phase difference of the fiber interferometer is calculated by measuring the interference photocurrent and the photocurrents from the two fiber arms based on a temperature control plat.
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