On Phase-shifting Algorithm to Eliminate Difference between Sampling Channels

The switching among channels in multi sampling channels system will result in phase difference between sampling signals in different channel. Through the computing with all kinds of approach algorithm, the difference between sampling channels will be eliminated to zero. On the base of introducing the correlative theory of approach algorithm, this paper analyzed and compared the principle, computing process and approach precision among of common phase-shifting algorithm, fitting algorithm and Lagrange interpolation algorithm, and given the conclusion finally.