Range limiting system for differentiating received signals

Details Range limiting system for differentiating received signals Range limiting system for differentiating received signals

G - Physics

01

S

343/19

G01S 13/04 (2006.01) G01S 7/32 (2006.01) G01S 13/82 (2006.01)

Patent

CA 2006803

Briefly, the range limiting system of the invention is capable of differentiating desired received signals having an amplitude above a predetermined threshold level and at least one other recognizable predetermined characteristic, from other received signals below that predetermined threshold amplitude. The system has a means for combining the received signal, which is of unknown amplitude which may be above or below the predetermined threshold amplitude, with a known signal of the predetermined threshold amplitude having at least one other predetermined characteristic which is distinguishable from the other recognizable characteristic of the received signal. The output of the combining means passes to a signal processing means which produces an output signal whose other recognizable characteristic is determined by the received signal only when the received signal is above the predetermined threshold amplitude, and by the known signal when the received signal is below the predetermined threshold amplitude. The presence or absence of the desired signal is determined on the basis of analysis of the other predetermined characteristic of the output signal of the signal processing means.

L'invention est un système de limitation de portée capable de distinguer les signaux reçus désirés, lesquels sont constitués par les signaux dont l'amplitude dépasse un seuil prédéterminé, des autres signaux reçus dont l'amplitude se trouve au-dessous de ce seuil, ainsi qu'une autre caractéristiques prédéterminée reconnaissable au moins. Le système de l'invention est doté d'un dispositif servant à combiner le signal reçu, dont l'amplitude inconnue a priori peut se trouver au-dessus ou au-dessous du seuil prédéterminé mentionné, avec un signal dont l'amplitude correspond à ce seuil, ce signal ayant au moins une autre caractéristique prédéterminée distincte des autres caractéristiques reconnaissables du signal reçu. Le signal de sortie du dispositif de combinaison en question est transmis à un dispositif de traitement de signaux qui produit un signal de sortie dont l'autre caractéristique reconnaissable est déterminée par le signal reçu seulement quand l'amplitude de ce dernier est au-dessus du seuil prédéterminé, et par le signal connu quand l'amplitude du signal reçu est au-dessous du seuil prédéterminé. La présence ou l'absence du signal désiré est déterminée d'après l'analyse de l'autre caractéristique prédéterminée du signal de sortie du dispositif de traitement de signaux.

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