Method for monitoring the operation of a global position system receiver
First Claim
1. A method for monitoring the operation of a receiver, comprising the steps of:
- determining a magnitude of a difference between two occurrences of a first signal;
comparing said magnitude of said difference to a preselected threshold value; and
identifying an operating condition of said receiver as a function of the relative magnitudes of said difference between said two occurrences and said preselected threshold value, wherein said identifying step comprises the step of determining that said receiver is inoperative if the absolute value of said difference is not greater than said preselected threshold value.
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Accused Products
Abstract
A method is provided for determining the validity of a signal received by a GPS receiver. A signal that is unfiltered, either mathematically or electronically, is monitored to determine the variability of different occurrences of the signal. These occurrences, which may be sequential, are compared to each other in order to detect whether or not variation exists between one occurrence of the signal and a subsequent occurrence of the signal. If no variation exists, it is determined that the signal is invalid and that a loss of fix of the satellite signal has occurred. If sufficient variability exists in the signal, between successive occurrences, the signal is deemed to be valid and suitable for use to control a vehicle such as a marine vessel.
53 Citations
13 Claims
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1. A method for monitoring the operation of a receiver, comprising the steps of:
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determining a magnitude of a difference between two occurrences of a first signal; comparing said magnitude of said difference to a preselected threshold value; and identifying an operating condition of said receiver as a function of the relative magnitudes of said difference between said two occurrences and said preselected threshold value, wherein said identifying step comprises the step of determining that said receiver is inoperative if the absolute value of said difference is not greater than said preselected threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for monitoring the operation of a receiver, comprising the steps of:
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receiving a first magnitude of a first occurrence of a first signal; receiving a second magnitude of a second occurrence of said first signal; calculating a change between said first and second magnitudes; and identifying an inoperative condition of said receiver when the degree of change between said first and second magnitudes is less than a preselected threshold value. - View Dependent Claims (10, 11, 12, 13)
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Specification