Radio receiver AM-MSK processing techniques

A radio receiver adapted to receive an AM-MSK modulated carrier signal includes an envelope detector and a transformer which restores the real signal to complex MSK format. A Doppler remover removes any Doppler shift of the MSK due to relative motion of the transmitter and receiver. A sample rate reducer may reduce the sample rate used in the Doppler remover to the transmitted symbol rate used during the modulation process.