Thales

Jean-Michel Perre

Nicolas Martin

David Depraz

Pierre-Yves Dumas

Vincent Chopard

Yves Clauzel

Stéphane Rollet

Nicolas Bastien

Stephane Rollet

Frédéric Berthoz

Fréderic Berthoz

A receiver of signals likely to be disturbed by an interfering signal, the receiver includes an interference rejection filter comprising a multiplying gain applied respectively to an in-phase channel and an in-quadrature channel of a signal received by the receiver, the value of the multiplying gain being determined by a nonlinear function K(&#x3c1;) of the modulus &#x3c1; of the received signal, the function K(&#x3c1;) being determined so as to maximize the signal-to-noise ratio after application of the multiplying gain and demodulation of the received signal.

Receiver of signals, in particular of GNSS signals, comprising an interference rejection filter, and associated method

The invention relates to a method for calibrating an antenna of a receiver of signals (s, . . . , s) originating from a plurality of sources, said receiver comprising a plurality of sensors (c, . . . , c), characterized in that it comprises the following steps:

Method and device for calibrating a receiver

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

The method of determination of the position of a mobile receiver using at least four satellites of which at least one first satellite transmits a first signal on one frequency, the broadcasting of the first signal being single-frequency, and of which at least one second satellite transmits second and third signals respectively on a first and a second frequency, the broadcasting of the signals being two-frequency, the receiver including means for reception of at least two frequencies, makes it possible to determine the position by a calculation of at least four pseudo-distances corresponding to the distances between each satellite and the receiver. The calculation of a pseudo-distance at the first frequency includes a step of estimation of the inter-frequency bias between the first and second frequencies.

Methods of calculating the position of a GNSS receiver from two-frequency and single-frequency pseudo-measurements

In a phase discriminator device for receiving, as input, a complex signal whose argument represents a phase error, and for producing, as output, an estimate of the phase error for each signal sample Zreceived, the device includes a frequency discriminator and a computation part for determining the phase estimate obtained at an instant (N+1)T. The computation part determines the phase estimate according to predetermined relations, and Tis the time interval between two samples Zand Z, received consecutively.

Device for discriminating the phase and the phase variation of a signal

A receiver of a digital signal equipped with an N-state weighted-decision trellis Viterbi decoder, the signal received including a series of symbols, is provided. The receiver comprises a programmable logic circuit that includes a source memory A and a destination memory B each comprising N rows and M+L columns respectively allocated to M fixed fields for describing the trellis, and to L variable fields, and an operator able to calculate the variable fields of a memory as a function of the fixed fields of the said memory, of the symbols received and of the variable fields of the other memory and able to reverse the role of the source memory and destination memory.

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St Peray, France

Jean-Michel Perre