Navigation system with apparatus for detecting accuracy failures
AssigneeHoneywell International Inc.
InventorKevin Vanderwerf
Life of this patent
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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.
Claims19
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, and
- using a parity space technique, determine at least one protection level value based on the error covariance matrix.
A non-transitory computer-readable medium having computer-executable instructions for performing steps comprising:
- 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.
Dependencies are inferred from the claim text.