对基频混频相位生成载波解调方法的局限性进行了研究与改进.在该方法的基础上, 通过引入直流滤波器, 滤除了直流成分的影响, 使得改进后的算法克服了基频混频相位生成载波解调方法只适用于小信号的局限性;通过引入抗混叠滤波器, 保留了有用频谱成分, 进一步降低了采样频率.在采样频率一定时, 最大限度地提高了系统可解调的动态范围上限, 给出了实现改进后算法的硬件实现方案, 并用Matlab及数字信号处理器软件开发代码调试器分别进行了仿真验证, 证明了这种改进解调方案的可行性.

An improved fundamental frequency mixing phase generated carrier demodulation algorithm was proposed. By introducing a direct current filter, the improved algorithm could overcome the limitation that the traditional fundamental frequency mixing phase generated carrier demodulation algorithm was only suitable for small-signal. The improved algorithm retained the useful components of the interference signal and reduced the sampling frequency of the system by introducing an anti-aliasing filter. The up-limit amplitude of the demodulated signal was maximized when the sampling frequency was fixed. And the hardware implementation scheme to realize the improved algorithm was presented. Simulations were carried on the Matlab platform and the digital signal processor simulation platform code composer studio prove the feasibility of the improved algorithm.