Systems and methods for detecting GPS measurement errors
First Claim
1. A system for detecting global positioning system (GPS) measurement errors comprising:
- a navigation device configured to receive GPS signals from signal sources, the navigation device being configured to calculate pseudoranges (PRs) and delta ranges (DRs) based on the received GPS signals, the navigation device including a consistency check algorithm configured to;
calculate delta PRs;
determine whether at least one difference between respective calculated delta PRs and DRs exceeds a first threshold; and
in response to determining that the at least one difference does not exceed the first threshold, accumulate the differences between the respective calculated delta PRs and DRs, determine whether the accumulation of the differences between the respective calculated delta PRs and DRs exceeds a second threshold, and indicate that an error exists in the respective calculated PRs and DRs if the accumulation of the differences exceeds the second threshold.
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Abstract
Systems and methods for detecting global positioning system (GPS) measurement errors are provided. In this regard, a representative system, among others, includes a navigation device that is configured to receive GPS signals from signal sources, the navigation device being configured to calculate pseudoranges (PRs) and delta ranges (DRs) based on the received GPS signals, the navigation device including a consistency check algorithm that is configured to: determine mismatches between the respective calculated PRs and DRs, and indicate that an error exists in the respective calculated PRs and DRs based on their mismatch and mismatch accumulations. This algorithm can be independent of navigation state and is capable of detecting slow-changing errors.
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Citations
13 Claims
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1. A system for detecting global positioning system (GPS) measurement errors comprising:
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a navigation device configured to receive GPS signals from signal sources, the navigation device being configured to calculate pseudoranges (PRs) and delta ranges (DRs) based on the received GPS signals, the navigation device including a consistency check algorithm configured to; calculate delta PRs; determine whether at least one difference between respective calculated delta PRs and DRs exceeds a first threshold; and in response to determining that the at least one difference does not exceed the first threshold, accumulate the differences between the respective calculated delta PRs and DRs, determine whether the accumulation of the differences between the respective calculated delta PRs and DRs exceeds a second threshold, and indicate that an error exists in the respective calculated PRs and DRs if the accumulation of the differences exceeds the second threshold. - View Dependent Claims (2, 3, 11, 12, 13)
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4. A method for measuring global positioning system (GPS) errors comprising:
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receiving GPS signals from signal sources; calculating pseudoranges (PR) and delta ranges (DR) based on the received GPS signals; calculating delta PRs; determining whether mismatches exist between respective calculated delta PRs and DRs based on a first threshold; and in response to determining that one or more mismatches exist, accumulating delta PR and DR mismatches and performing a consistency check involving the accumulated delta PR and DR mismatches based on a second threshold. - View Dependent Claims (5, 6, 7)
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8. A global positioning system (GPS) receiver comprising:
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an antenna that receives GPS signals from signal sources; a digital signal processing (DSP) configured to receive the GPS signals from the antenna, the DSP being configured to calculate pseudoranges (PRs) and delta ranges (DRs) based on the received GPS signals; and a consistency check algorithm configured to; determine whether one or more mismatches exist between respective calculated delta PRs and DRs, and in response to determining that one or more mismatches exist, accumulate delta PR and DR mismatches and perform a consistency check involving the accumulated delta PR and DR mismatches based on a threshold. - View Dependent Claims (9)
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10. A global positioning system (GPS) receiver comprising:
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an antenna that receives GPS signals from signal sources; a digital signal processing (DSP) that receives the GPS signals from the antenna, the DSP being configured to calculate pseudoranges (PRs) and delta ranges (DRs) based on the received GPS signals; and a consistency check algorithm that is configured to; calculate delta PRs; accumulate differences between respective calculated delta PRs and DRs based on whether one or more mismatches exist between the respective calculated delta PRs and DRs, determine whether the accumulation of the differences between respective calculated delta PRs and DRs exceeds a threshold; and responsive to determining that the accumulation of the differences exceeds the threshold, indicate that an error exists in the respective calculated PRs and DRs.
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Specification