Abstract: The double-channel satellite navigation system according to the invention comprises two identical channels whereof each contains a mixer. The inputs of the two mixers receive the high and low frequency components, respectively, of a double-frequency signal sent by a navigation satellite. Each of the mixers has its output connected to the input of a phase detector. Each of the channels further contains an extrapolator and a commutator which are placed in series. The output of the phase detector is electrically connected to the input of the extrapolator and a second input of the commutator whereof the output is connected to the input of a voltage-controlled oscillator. Finally, the system includes a signal level analyzer intended to analyze the level of signals arriving from the navigation satellite. The signal level analyzer has its output connected to a second input of the extrapolator and a third input of the commutator.