Abstract: A receiver for radiofrequency signals designed to be installed on board a satellite comprises: a device for frequency controlling the receiver allowing the reception frequency of the receiver to be adjusted based on a frequency command; and a filtering assembly of the bandpass filter type having a passband, referred to as passband of the filtering assembly, having an adjustable passband width able to take a set of values, the filtering assembly allowing the bandwidth of a first signal representative of the input signal of the receiver to be limited to the passband of the filtering assembly; adjustment means allowing the width of the passband of the filtering assembly to be adjusted using a filtering passband control; power acquisition means allowing a measurement of the power of the first signal to be delivered at the output of the filtering assembly.

Abstract: A device for double frequency transposition includes means for controlling the frequencies FOL1, FOL2 of a first and a second synthesizer, which are adapted to carry out the steps of (a) initializing the frequency FOL2 at a first given value FOL2,A; and (b) for a given pair of frequencies FRF, FFI2, determining the frequency FOL1 with the aid of the following relations: if FRF>FOL1 and FFI1<FOL2, FRF=FOL1+FOL2?FFI2??(5), if FRF>FOL1 and FFI1>FOL2, FRF=FOL1+FOL2+FFI2??(6), if FRF<FOL1 and FFI1>FOL2, FRF=FOL1?FOL2?FFI2??(7), if FRF<FOL1 and FFI1<FOL2, FRF=FOL1?FOL2+FFI2??(8); and (c) if the value obtained for FOL1 lies in a frequency band of lower bound A·FREF?B·X and upper bound A·FREF+B·X, where A is a strictly positive integer and X is a given parameter, modifying the frequency FOL2 to a second value FOL2,B determined so that the difference in absolute value between FOL2,A and FOL2,B satisfies the following two conditions: |FOL2,B?FOL2,A|>AFREF+2B·X |FOL2,B?FOL2,A|<AFREF

Abstract: Device for controlling a frequency F of a TTC satellite link transmitter and/or receiver on the basis of a frequency command whose value is taken in a predetermined frequency plan composed of several frequency notches distributed in a discontinuous manner in a given frequency band, said device including a quartz oscillator delivering a reference frequency FOCXO, a synthesized local oscillator delivering said frequency F on the basis of said reference frequency FOCXO according to a relation F = F OCXO ? N R where N and R are programmable divider coefficients, and a digital integrated circuit which implements a conversion table mapping each frequency notch of said predetermined frequency plan to a set of binary addresses distributed in a contiguous manner addressing the values of said coefficients N and R in the form of binary words allowing the synthesized local oscillator to generate said frequency F whose value is equal to that of said frequency command.

Abstract: The subject of the present invention is a frequency and phase modulation remote control receiver for a geostationary satellite which is lighter and less expensive than the customary receivers, while not degrading the passband of the telecommunication equipment for its payload, and it is characterized in that it comprises a heterodyne amplifier analog input and filtering circuit (28) followed by a digital processing circuit (49) configurable as an FM demodulation device or as a PM demodulation device, the analog input circuit being common to both modes of demodulation.