Spoofer detection power management for GPS receivers
First Claim
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1. A method for conserving power in a radio comprising a GPS receiver for receiving GPS signals, a C/A-code module for detecting first positional information and a P-code module for detecting second positional information, comprising the steps of:
- providing power to said C/A module whereby said C/A module provides positional information from said GPS signals;
detecting the occurrence of interference signals;
providing power to said P-code module when said interference signals are detected; and
removing power from said P-code module when interference signals are not detected.
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Abstract
In a GPS receiver, power is conserved by powering down P-code circuitry during and utilizing C/A code circuits during times when interfering signals, such as spoofing signals, are not detected. When spoofing is detected, the P-code circuitry is powered up so that the GPS receiver can continue to operate in the presence of spoofing.
59 Citations
14 Claims
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1. A method for conserving power in a radio comprising a GPS receiver for receiving GPS signals, a C/A-code module for detecting first positional information and a P-code module for detecting second positional information, comprising the steps of:
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providing power to said C/A module whereby said C/A module provides positional information from said GPS signals; detecting the occurrence of interference signals; providing power to said P-code module when said interference signals are detected; and removing power from said P-code module when interference signals are not detected. - View Dependent Claims (2, 3, 4)
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5. A GPS radio, comprising:
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a battery; an antenna; first circuitry coupled to said antenna for receiving GPS signals and for determining the positional location of said antenna to a first degree of accuracy; second circuitry coupled to said antenna for receiving said GPS signals and for determining the positional location of said antenna to a second higher degree of accuracy; interference detecting circuitry having an output for indicating the detection of undesired GPS type signals interfering with said GPS signals; and switchable power connections coupled between said battery and said second circuitry and operable in response to said detecting circuitry to establish battery connections to said second circuitry when said interfering signals are detected. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. A GPS radio, comprising:
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a power terminal; an antenna; first circuitry coupled to said power terminal and coupled to said antenna for receiving GPS signals and for determining the positional location of said antenna to a first degree of accuracy; second circuitry coupled to said power terminal and coupled to said antenna for receiving said GPS signals and for determining the positional location of said antenna to a degree of accuracy more precise than said first degree of accuracy; interference detecting circuitry coupled to said power terminal and operable to provide an output indicating the presence of undesired GPS type signals; and controllable switch means coupled between said power terminal and said second circuitry and operable in response to said interference detecting circuiting output to connect said power terminal to said second circuitry when said undesired GPS type signals are present and for disconnecting said power terminal from said circuitry when said undesired GPS type signals are not present. - View Dependent Claims (14)
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Specification