A software based algorithm for demodulating BPSK telemetry signal

摘要

A software-based algorithm for demodulating BPSK (Binary Phase Shift Keying) telemetry signal is proposed in this article and its feasibility is simulated. Hilbert Transform is used in this algorithm to calculate the instant phase, instant frequency and instant amplitude of signal, which are the basic parameters for signal analysis and signal recognition. The noise robustness is also analyzed. The Hilbert Transform can be realized by calculating FFT twice, which is very fast and make the algorithm a real time method to demodulate telemetry signal. This algorithm can be applied for demodulating the PSK, FSK signal, which make it a versatile method.