Thales

David Depraz

Nicolas Martin

Jean-Michel Perre

Vincent Chopard

Patrice Guillard

Frédéric Berthoz

Fréderic Berthoz

Christian Mehlen

A GNSS signal multipath detection device () for a GNSS receiver () on-board a carrier further comprising one or a plurality of antennas () and comprising:

GNSS signal multipath detection device, and associated carrier geolocation system and multipath detection method

The invention relates to a device for receiving satellite radio-navigation signals comprising a plurality of receiving antennas forming an antenna array. The invention consists in using a plurality of antennas disposed around the circumference of a carrier and in demodulating the signals received by each antenna separately. The diversity of the demodulation chains is utilized to compensate the signal loss on one of the chains when the corresponding antenna experiences a signal loss due to the masking of the satellite by the carrier.

Multi-antenna radio-navigation signals reception device

The invention relates to a device for receiving satellite radio-navigation signals comprising a plurality of receiving antennas forming an antenna array. The invention consists in using a plurality of antennas disposed around the circumference of a carrier, in demodulating the signals received by each antenna separately and then in combining the various demodulated signals, thereby amounting to effecting a beam forming in an equivalent antenna pattern. The invention then requires only a single synchronization slaving for the set of demodulation pathways.

Device for receiving radio-navigation signals with multiple antennas and common synchronization slaving

An automatic gain correction circuit for radiofrequency signals applies notably to the regulation of the amplification of signals for satellite radionavigation. The automatic gain correction circuit is able to receive an input radiofrequency signal and to deliver an output radiofrequency signal of which a mean amplitude is slaved to a setpoint. It comprises means for modifying the setpoint as a function of the mean amplitude of the input signal between a minimum setpoint value and a maximum setpoint value, the minimum setpoint value corresponding to a first mean amplitude of the input signal and the maximum setpoint value corresponding to a second mean amplitude of the input signal, the first mean amplitude being lower than the second mean amplitude.

Automatic gain correction circuit with variable setpoint

A system for receiving an analogue signal e includes amplifying and digitizing the signal in order to obtain a digitized signal e, a power inversion module, the module determining an inversion gain g, this gain being applied to the digitized signal e, an automatic gain control AGC loop adapting the power of the signal e before digitization, the input signal of the AGC loop being a function of the inversion gain g.

Reception system including a mechanism countering pulsed interference

An analog-digital conversion system comprising at least one variable gain amplifier amplifying an input signal e, an analog-digital converter CAN digitizing said signal e, an interference-suppressing digital processing module, processing the digitized signal, also comprises a first automatic gain control AGC loop, called the analog AGC loop, that compares an estimate of the output power of the CAN converter with a control setpoint gcalled the control setpoint of the analog AGC loop, a gain ga used to control the variable gain amplifier being deduced from this comparison. The system also comprises a second automatic gain control AGC loop called the digital loop, said digital loop comparing an estimate of the power after the interference-suppressing digital processing with a predetermined control setpoint gn, the analog AGC loop being controlled by a control setpoint deduced from this comparison.

Analog-digital conversion system comprising a double automatic gain control loop

Described is a device for receiving radio-navigation signals by satellite, said received signals being transmitted at a carrier frequency. The device includes at least means for generating a local signal at a local frequency and a tracking device including a feedback loop called carrier loop for phase-locking the local frequency on the carrier frequency. The loop includes a hardware portion and a software portion. The software portion performs the functions of discrimination of the phase of the correlated signal and filtering of said phase. The software portion also includes correlation functions mainly dependent on the linear variation coefficients between the local phases &#x3c6;delivered after each basic computation cycle. The device makes it possible to increase the loop band and the dynamic stability without changing the pre-detection band and the workload of the software.

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Valence, France

David Depraz