Correcting for time delay variation in a satellite for positioning, navigation or timing applications
First Claim
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1. A method for correcting for time delay variations between a plurality of selectable signal paths from a signal source to at least one transmit antenna of a satellite, the method comprising:
- measuring a time delay for each of the plurality of selectable signal paths; and
correcting a signal for a time delay variation based on the time delay for a currently used signal path that is being used by the satellite to transmit the signal to a receiver, the currently used signal path being selected from the plurality of selectable signal paths from the signal source to the at least one transmit antenna by a switch mechanism and the corrected signal being usable for at least one of navigation, determining a geographic location and determining time.
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Abstract
A method for correcting for time delay variations between a plurality of signal paths from a signal source to at least one transmit antenna of a satellite may include measuring a time delay for each of the plurality of signal paths. The method may also include correcting a signal for the time delay variation based on the time delay for the signal path that is currently being used by the satellite, the corrected signal being usable for at least one of navigation, determining a geographic location and determining time.
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Citations
32 Claims
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1. A method for correcting for time delay variations between a plurality of selectable signal paths from a signal source to at least one transmit antenna of a satellite, the method comprising:
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measuring a time delay for each of the plurality of selectable signal paths; and correcting a signal for a time delay variation based on the time delay for a currently used signal path that is being used by the satellite to transmit the signal to a receiver, the currently used signal path being selected from the plurality of selectable signal paths from the signal source to the at least one transmit antenna by a switch mechanism and the corrected signal being usable for at least one of navigation, determining a geographic location and determining time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 32)
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23. A method for correcting for time delay variations between a plurality of selectable signal paths from a signal source to at least one transmit antenna of a satellite, the method comprising:
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transmitting a signal by a currently used signal path of the plurality of selectable signal paths of the satellite, the currently used signal path being selected from the plurality of selectable signal paths from the signal source to the at least one transmit antenna by a switch mechanism; and correcting the signal for a time delay variation of the currently used signal path by applying a calibrated time delay value for the currently used signal path, wherein the calibrated time delay value is determined from a measured time delay for the currently used signal path, the corrected signal being usable for at least one of navigation, determining a geographic location and determining time. - View Dependent Claims (24)
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25. A satellite comprising:
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a signal source for generating a signal; at least one transmit antenna; a plurality of selectable signal paths between the signal source and the at least one transmit antenna, the plurality of selectable signal paths comprising time delay variations between the signal source and the at least one transmit antenna; a processor; and a module operating on the processor to determine a time delay variation based on the time delay for a currently used signal path that is being used by the satellite to transmit signals to a receiver, the currently used signal path being selected from the plurality of selectable signal paths by a switch mechanism and the time delay variation being used to correct the signal and the corrected signal being usable for at least one of navigation, determining a geographic location and determining time. - View Dependent Claims (26, 27, 28, 29)
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30. A receiver comprising:
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an antenna for receiving a signal from a satellite, wherein the satellite comprises a plurality of selectable signal paths from a signal source to at least one transmit antenna, the plurality of selectable signal paths comprising time delay variations between the signal source and the at least one transmit antenna; a processor; and a module operating on the processor to correct the signal for a time delay variation based on a time delay for a currently used signal path that is being used by the satellite to transmit signals to the receiver, the corrected signal being usable for at least one of navigation, determining a geographic location, and determining time, wherein the currently used signal path is selected from the plurality of selectable signal paths; and a look-up table, the receiver receiving a unique identifier corresponding to the currently used signal path and the receiver being adapted to use the unique identifier to reference into the look-up table to determine a calibrated time delay value for the currently used signal path in the satellite to correct the signal from the satellite. - View Dependent Claims (31)
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Specification