Multirate digital phase generated carrier demodulation

Based on the signal bandwidth in each phase generated carrier (PGC) demodulation procedure, a multirate demodulation scheme was proposed to solve the real time digital PGC demodulation problem at high sampling rate. The interfered output was analog-to-digital converted at high sampling rate to improve demodulation bandwidth and dynamic range. The procedures after frequency mixing and low pass filtering were down sampled and digital PGC demodulation computation was reduced. A digital PGC demodulation system was designed and implemented. The frequency mixing and low pass filtering procedures were implemented using field programmable gate arrays (FPGA) and the following procedures were implemented using digital signal processor (DSP). Real-time demodulation experiment verified that a test signal with 5kHz and 1rad was successfully demodulated at 1MHz sampling rate.