为了有效消除载波延迟对相位生成载波（PGC）算法的影响，提出了一种基于同步载波复原的混频基频、二倍频信号生成方法，直接从干涉信号中提取出载波信息并进行同步载波复原。阐述了该方法的生成原理，并通过理论分析、数值计算与仿真解调等手段对相位延迟的影响进行了详细的分析。仿真与实验结果表明，基于同步载波复原方法获得的混频信号与干涉信号完全对齐，可以保证PGC算法实现稳定、精确的解调。

To effectively eliminate the adverse effects of carrier delay on phase generated carrier (PGC) algorithm, a method based on synchronous carrier restoration is presented to generate the fundamental and second harmonic carrier signals. With this method the carrier information is directly extracted from interferometer signal and then the carrier signal is restored synchronously. The basic theory of synchronous carrier restoration is elaborated, and the influences of carrier phase delay are detailedly analyzed by theoritical analysis, numerical calculation and simulated demodulation. Results of the simulation and experiment show that the mixing signal is perfectly aligned with the interference signal, both of which are obtained with the synchronous carrier restoration method. Therefore, the proposed approach can guarantee PGC algorithm to realize stable and accurate demodulation.