Satellite receiving method and system

摘要

Satellite receiving system and method for adjusting a satellite receiving system ( 100 ) including an input ( 113 ); a first oscillator ( 106 ) with theoretical frequency (F_OSC1) and real frequency (F_OSC1'), a first frequency mixer ( 105 ) delivering a signal at a first intermediate frequency (F₂), a second oscillator ( 302 ) with frequency (F_OSC2), a second frequency mixer ( 301 ) delivering a signal at a second intermediate frequency (F_OUT), a microcontroller ( 202 ), which controls a real frequency (F_VCO) of the second oscillator, and an output ( 110 ). An external signal ( 112 ) at a determined frequency (F₁) is supplied to the input ( 113 ). Then a nominal value (F_OSC2) of the frequency of the second oscillator is determined as a function of the input frequency (F₁), the theoretical frequency (F_OSC1) of the first oscillator and the second intermediate frequency (F_OUT). Then, the frequency of the second oscillator is controlled, via the microcontroller, at the determined nominal value. An offset is detected between the theoretical frequency (F_OSC1) and the real frequency (F_OSC1') of the first oscillator, from an offset between the first intermediate frequency (F₂) and the second intermediate frequency (F_OUT) at the output ( 110 ). The offset is corrected by correcting the nominal frequency (F_OSC2) of the second oscillator into a real frequency (F_VCO) so as to cancel out the offset at the output.