Canadian Patents Database

Patent Summary

(12) Patent:	(11) CA 2165420
(54) English Title:	SYSTEM AND METHOD FOR MODULATING A CARRIER FREQUENCY
(54) French Title:	SYSTEME ET METHODE DE MODULATION DE FREQUENCE DE PORTEUSE

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Representative Drawing

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Abstracts

English Abstract

A carrier frequency modulating system and method for producing a modulated carrier frequency is disclosed. The system comprises
a carrier frequency signal generator (23) for producing a carrier frequency signal at a carrier frequency at an output (42) thereof. The
system further comprises a sequencer (32) for producing a modulation signal at an output (35) thereof. This modulation signal comprises a
plurality of modulation signal portions (68, 68) separated by at least one null modulation signal portion (69) having a corresponding time
length. The system is provided with a modulator (46) for producing a modulated carrier frequency signal at an output (76) thereof. The
modulator (76) has a first input (44) connected to the output (42) of the carrier frequency signal generator (23) for receiving the carrier
frequency signal, and has a second input (48) for receiving the modulation signal. The system further comprises a power supply unit (55)
for supplying electrical power to the carrier frequency signal generator (23). The sequencer (32) is connected to the carrier frequency signal
generator (23) for controlling the activation thereof and to interrupt the carrier frequency signal generator (23) instead of modulating the
null modulation signal portion during the corresponding time length, whereby power consumption of the system is minimized.

French Abstract

L'invention concerne un système et un procédé qui permettent de produire une fréquence porteuse modulée. Le système comprend un générateur (23) de signal de fréquence porteuse qui produit un tel signal à une fréquence porteuse au niveau d'une sortie (42). Ce système comporte aussi un séquenceur (32) qui produit un signal de modulation au niveau d'une sortie (35). Ce signal de modulation comprend plusieurs parties (68) séparées par au moins une partie (69) de signal à modulation nulle émise pendant une durée correspondante. Ce système comporte un modulateur (46) qui produit au niveau d'une sortie (76) un signal de fréquence porteuse modulée. Ce modulateur (76) présente une première entrée (44), connectée à la sortie (42) du générateur (23) de signal de fréquence porteuse (23), afin de recevoir ce signal, et il présente une deuxième entrée (48) destinée à recevoir le signal de modulation. Le système comprend en outre une unité d'alimentation (55) qui fournit l'énergie électrique au générateur (23) de signal de fréquence porteuse. Le séquenceur (32), connecté à ce générateur (23), en commande l'activation et l'interrompt plutôt que de moduler la partie de signal à modulation nulle, pendant sa durée correspondante, ce qui permet de réduire la consommation d'énergie du système.

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Patent Details

(51) International Patent Classification (IPC):	H03C 5/00 (2006.01) G01S 1/02 (2006.01)
(72) Inventors (Country):	LABRECHE, LOUIS (Canada) LEPAGE, JEAN-PIERRE (Canada)
(73) Owners (Country):	THE CANADIAN SPACE AGENCY, AN AGENCY OF THE GOVERNMENT OF CANADA (Canada)
(71) Applicants (Country):	THE CANADIAN SPACE AGENCY, AN AGENCY OF THE GOVERNMENT OF CANADA (Canada)
(74) Agent:	FRENCH, DAVID J.
(45) Issued:	2003-12-16
(86) PCT Filing Date:	1994-06-17
(87) PCT Publication Date:	1995-01-05
Examination requested:	1998-11-09
(30) Availability of licence:	N/A
(30) Language of filing:	English

Patent Cooperation Treaty (PCT):	Yes
(86) PCT Filing Number:	PCT/CA1994/000348
(87) International Publication Number:	WO1995/000859
(85) National Entry:	1995-12-15

(30) Application Priority Data:
Application No. Country Date 220,215 United States of America 1994-03-30 2,120,077 Canada 1993-06-17

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View Patent Image	Download Patent Image in PDF Format	Size of Image (KB)	Number of Pages
Cover Page	Cover Page	56	1
Abstract	Abstract	65	1
Claims	Claims	1,284	30
Description	Description	1,525	34
Drawings	Drawings	228	10
Representative Drawing	Representative Drawing	11	1

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