Phase demodulator and its application to an MLS type landing system

DETAILED DESCRIPTION More precisely, an object of the invention is: A phase demodulator comprising: means (2) for modulating the phase of the first signal (S.
sub.
1) of fixed frequency (w.
sub.
1) neighbouring the frequency (w.
sub.
o) of a second signal (s(t)), to be demodulated; means (5;51) enabling the mixing of the above two signals; means (3) forming a loop filter receiving the signal (S.
sub.
5 ; S.
sub.
51) coming from the mixing means, the output signal of said loop filter means (3) providing for the control of the modulation means (2); processing means (4) providing for filtering operation, and receiving the output signal of the loop filter means and forming the output signal of the device.