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。
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.
相位统计矩方法利用MPSK信号符号初相位偶阶统计矩为M的单调递增函数的特性，并进行M进制识别复合假设检验。
In the SPM method the composite hypothesis test is performed by means of the monotonic characteristic of the even order statistical phase moments of MPSK signals.
应用推荐