Quasi-coherent pulse ultra-wideband receiver and signal demodulation method

The invention provides a quasi-coherent pulse ultra-wideband receiver. The received radio frequency signal is decomposed into two paths of orthogonal signals after being down-converted into low and intermediate frequencies; therefore, even if the quality of the radio frequency local oscillation signal is not high, the influence of the frequency error can be eliminated after the two paths of orthogonal signals are subjected to square addition; the demodulation performance of the quasi-coherent pulse ultra-wideband receiver is not sensitive to a phase error and a frequency error between a radio frequency signal and a radio frequency local oscillation signal. According to the invention, a high-quality radio frequency local oscillation signal is not needed, a high-precision frequency synthesizer and a high-speed analog-digital converter are not needed, and the equipment is suitable for a low-power-consumption application scene. In addition, the capability of resisting non-ideal factors such as narrow-band interference is high. The invention further provides a signal demodulation method which is applied to the quasi-coherent pulse ultra-wideband receiver.