The principles of phased array are expressed firstly in china and time delay transmission theory of phased array is also present . this theory make it possible to transmit broadband signals and the phased array improved by this theory can be used in acoustic doppler current profiler 阐述了我国首次自行研制的相控阵的原理并提出了相控阵的时延发射原理,使得相控阵可以发射宽带信号,从而能够在多普勒流速剖面仪中使用相控阵。