GPS signal processing with 5-level carrier injection demodulation function using dual 3-level single sideband mixers

摘要

An improved GPS receiver including a 5-level carrier injection function for digitally demodulating down-converted GPS signals, which utilizes dual 3-level single sideband mixers where one of the single sideband mixers is delayed by a predetermined interval, thereby allowing for the combination of the two 3-level single sideband mixers to be combined to provide an overall output signal which is representative of an output of a demodulator using a 5-level carrier injection signal.