In phase-coherent communication system, phase-locked loop is always used to yield coherentreference signal.
相位相干通信系统中，通常采用锁相环路来产生相干参考信号。
2
Neither the coherent optical input image nor the Fourier transform hologram of the reference image is required by this system.
这个系统既不需要相干光输入图像，也不需要基准图像的付氏变换金息图。
3
The distribution of interference light intensity generated by multiple coherent laser beams on reference plane is derived in theory and the numerical calculation is carried out.