Low probability of intercept coherent radar altimeter

G - Physics – 01 – S

Patent

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Details

G01S 13/26 (2006.01) G01S 7/03 (2006.01) G01S 7/40 (2006.01) G01S 13/02 (2006.01) G01S 13/88 (2006.01)

Patent

CA 2412907

A radar altimeter for determining altitude of an air vehicle with respect to ground comprises a digital sequencer for digitally modulating a first signal. A transmitter coupled to the digital sequencer transmits a radar signal including the modulated first signal toward the ground. A receiver receives a reflected radar signal from the ground. The received radar signal includes the modulated first signal. A digitizer coupled to the receiver generates digital samples of the modulated first signal. A digital signal processor coupled to the digitizer receives digital samples of the modulated first signal from the digitizer, demodulates the received digital samples, processes the demodulated digital samples and outputs altitude data based on the demodulated digital samples.

L'invention concerne un altimètre radar permettant de déterminer l'altitude d'un véhicule aérien par rapport au sol. Cet altimètre comprend un séquenceur numérique permettant de moduler numériquement un premier signal. Un émetteur couplé au séquenceur numérique émet en direction du sol un signal radar comprenant le premier signal modulé. Un récepteur reçoit du sol un signal radar réfléchi. Ce signal radar réfléchi comprend le premier signal modulé. Un numériseur couplé au récepteur génère des échantillons numériques du premier signal modulé. Un processeur de signaux numériques couplé au numériseur reçoit des échantillons numériques du premier signal modulé du numériseur, démodule les échantillons numériques reçus, traite les échantillons numériques démodulés et émet des données d'altitude sur la base des échantillons numériques démodulés.

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