Navigation system with apparatus for detecting accuracy failures
First Claim
1. A navigation system for a vehicle having a receiver operable to receive a plurality of signals from a plurality of transmitters, the navigation system comprising:
- a processor; and
a memory device having stored thereon machine-readable instructions that, when executed by the processor, enable the processor to;
determine a set of error estimates corresponding to pseudo-range measurements derived from the plurality of signals,determine an error covariance matrix for a main navigation solution based on the determined set of error estimates, the error covariance matrix including off-diagonal elements representing ionospheric-delay spatial correlation, andusing a parity space technique, determine at least one protection level value based on the error covariance matrix.
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Accused Products
Abstract
A navigation system for a vehicle having a receiver operable to receive a plurality of signals from a plurality of transmitters includes a processor and a memory device. The memory device has stored thereon machine-readable instructions that, when executed by the processor, enable the processor to determine a set of error estimates corresponding to pseudo-range measurements derived from the plurality of signals, determine an error covariance matrix for a main navigation solution using ionospheric-delay data, and, using a parity space technique, determine at least one protection level value based on the error covariance matrix.
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Citations
19 Claims
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1. A navigation system for a vehicle having a receiver operable to receive a plurality of signals from a plurality of transmitters, the navigation system comprising:
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a processor; and a memory device having stored thereon machine-readable instructions that, when executed by the processor, enable the processor to; determine a set of error estimates corresponding to pseudo-range measurements derived from the plurality of signals, determine an error covariance matrix for a main navigation solution based on the determined set of error estimates, the error covariance matrix including off-diagonal elements representing ionospheric-delay spatial correlation, and using a parity space technique, determine at least one protection level value based on the error covariance matrix. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A non-transitory computer-readable medium having computer-executable instructions for performing steps comprising:
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determining a set of error estimates corresponding to pseudo-range measurements derived from the plurality of signals; determining an error covariance matrix for a main navigation solution using ionospheric-delay data, wherein the error covariance matrix includes off-diagonal elements representing the spatially correlated ionospheric error for the plurality of signals; using a parity space technique, determining at least one protection level value based on the error covariance matrix; and displaying the at least one protection level value. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification