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US 5,592,131 AGranted
System and method for modulating a carrier frequency
AssigneeCanadian Space Agency
InventorsLouis Labreche, Jean-Pierre Lepage
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AssigneeCanadian Space Agency
InventorsLouis Labreche, Jean-Pierre Lepage
Estimating the term…
A carrier frequency modulating system and method for producing a modulated carrier frequency is disclosed. The system comprises a carrier frequency signal generator for producing a carrier frequency signal at a carrier frequency at an output thereof. The system further comprises a sequencer for producing a modulation signal at an output thereof. This modulation signal comprises a plurality of modulation signal portions separated by at least one null modulation signal portion having a corresponding time length. The system is provided with a modulator for producing a modulated carrier frequency signal at an output thereof. The modulator has a first input connected to the output of the carrier frequency signal generator for receiving the carrier frequency signal, and has a second input for receiving the modulation signal. The system further comprises a power supply unit for supplying electrical power to the carrier frequency signal generator. The sequencer is connected to the carrier frequency signal generator for controlling the activation thereof and to interrupt the carrier frequency signal generator instead of modulating the null modulation signal portion during the corresponding time length, whereby power consumption of the system is minimized.
A carrier frequency modulating system comprising:
A carrier frequency modulating system as claimed in claim 14, wherein each of said conducting paths comprises first and second portion connected respectively by third and fourth nodes which are spaced from said first node by a distance substantially equal to half a wavelength corresponding to said carrier frequency, the second portion of said first conducting path having a length separating said third node from said second node by a distance substantially equal to three quarter a wavelength corresponding to said carrier frequency, the second portion of said second conducting path having a length separating said fourth node from said second node by a distance substantially equal to half a wavelength corresponding to said carrier frequency, whereby to provide said half a wavelength difference in length of said conducting paths, said switching means being connected to said first and second conducting paths respectively at said third and fourth nodes.
A method of modulating a carrier frequency comprising the steps of:
Dependencies are inferred from the claim text.