Double-channel satellite navigation system

A double-channel satellite navigation system whereof outputs are electrically connected to a computer, each of its two channels comprising:

• a mixer having a first input intended to receive one frequency component of a double-frequency signal transmitted by the navigation satellite, a second input and an output;
• an amplifier having a first input, a second input and an output, said first input of said amplifier being connected to said output of said mixer;
• a phase detector having a first input, a second input and an output, said first input of said phase detector being connected to said output of said amplifier;
• a reference frequency oscillator having an output connected to said second input of said phase detector;
• an extrapolator having a first input, a second input and an output, said first input of said extrapolator being connected to said output of said phase detector;
• a commutator having a first input, a second input, a third input and an output, said first input of said commutator being connected to said output of said phase detector, said second input of said commutator being connected to said output of said extrapolator;
• a voltage-controlled oscillator having an output and an input connected to said output of said commutator;
• a frequency multiplier having an input connected to said output of said voltage-controlled oscillator, and an output connected to said second input of said mixer;
• a Doppler frequency measuring unit having an input connected to said output of said frequency multiplier, and an output which serves as an output of the channel;
• a signal level analyzer having an input connected to said output of said amplifier, and an output connected to said second input of said extrapolator and to said third input of said commutator and serving as an output of the channel;
• an ephemeris information selection unit having an input connected to said output of said amplifier, and an output which serves as an output of the channel.