Abstract
Because there is a certain phase difference between the two adjacent samples of an analog-to-digital converter for a heterodyne signal, we propose to eliminate the random phases in the coherent accumulation by shifting the sampling sequences with different steps. A genetic algorithm is used to determine the shifting steps of the sequences. An experiment has been conducted to verify the effectiveness of our approach. The results prove that the approach can greatly increase the strength of the heterodyne signal compared with the accumulation with random phases. Our approach is easier to implement in comparison with existing technologies.