Fm-cw radar

G - Physics – 01 – S

Patent

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Details

G01S 13/34 (2006.01) G01S 13/02 (2006.01)

Patent

CA 2330430

This FM-CW radar apparatus comprises a transmitter section, a receiver section, and a signal processing section. The transmitter section transmits a frequency-modulated continuous wave as a transmitted wave. The receiver section receives a radio wave resulting from reflection of the transmitted wave at a target, as a received wave, by a receiving antenna comprising an array of antenna elements, generates a beat signal which is a difference of the transmitted wave and the received wave in each of channels of the respective antenna elements, and converts this beat signal to a digital beat signal by A/D conversion. The signal processing section executes a digital beamforming operation with the digital beat signals and detects the target from the result of the operation. The receiver section has a switch means for selectively connecting either one of the antenna elements to a circuit for generating the beat signal, and this switch means connects only part of the antenna elements to the beat signal generating circuit in one period of the repetition periods of the frequency modulation.

L'invention concerne un radar FM-CW comprenant une partie émetteur, une partie récepteur et une partie processeur de signaux. La partie émetteur émet des ondes continues modulées en fréquence. La partie récepteur reçoit les ondes réfléchies par des cibles au moyen d'une antenne qui comprend un réseau d'éléments antenne, produit un signal de battement ou la différence entre les signaux émis ou reçus pour chaque élément antenne et transforme le signal de battement en un signal de battement numérique. La partie processeur de signaux traite le signal de battement numérique par conformation de faisceaux numériques et détecte ainsi la cible. La partie récepteur comprend un système de commutation destiné à connecter sélectivement un des éléments antenne à un circuit générateur de signaux de battement. Le système de commutation connecte une partie seulement des éléments antenne au circuit générateur de signaux de battement pendant un seul cycle de modulation en fréquence.

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