Instrument landing system glide path transmitter device

Details Instrument landing system glide path transmitter device Instrument landing system glide path transmitter device

G - Physics

01

S

G01S 1/22 (2006.01) G01S 1/18 (2006.01) G08G 5/02 (2006.01)

Patent

CA 2261668

The invention relates to a glide path transmitter device for an instrument landing system (ILS), comprising several antenna radiators (A1, A2, A3) via which high frequency signals containing various low-frequency modulated carrier and side band components are radiated, said components overlapping each other in the far field, where they form a guide signal which can be evaluated by aircraft. The phases of the carrier oscillations of the radiated high frequency signals forming the guide signal have a set relationship in respect to each other. The inventive device is characterized in that a separate digitally controlled modulator (45, 46, 47) is provided for each high frequency signal fed to an antenna radiator, said modulator modulating the phase and the amplitude of a high frequency oscillation (f1) fed thereto according to a given model and inputs the modulated high frequency signal into the antenna radiator (A1, A3, A2) allocated thereto, thereby reducing supply network expenditure.

L'invention concerne un dispositif émetteur d'alignement de descente pour système d'atterrissage aux instruments (ILS), comprenant plusieurs radiateurs d'antenne (A1, A2, A3), par l'intermédiaire desquels sont diffusés des signaux haute fréquence contenant des composantes porteuse et signal de bande latérale modulées à basse-fréquence, différentes. Ces signaux haute-fréquence se superposent dans la zone de Fraunhofer où ils forment un signal de guidage pouvant être exploité par des aéronefs, les phases des porteuses des signaux haute fréquence à diffuser qui forme le signal de guidage étant en relation fixe l'une avec l'autre. Ce dispositif se caractérise en ce que pour chacun des signaux haute fréquence conduits à un radiateur d'antenne est monté un modulateur (45, 46, 47) séparé, commandé numériquement, qui module la phase et l'amplitude d'une oscillation haute fréquence (F1) conduite jusqu'à lui, selon un modèle pré-determiné, et injecte le signal haute fréquence modulé dans le radiateur d'antenne (A1, A2, A3) qui lui est affecté. Ainsi, les coûts relatifs au réseau d'alimentation sont réduits.

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