US5841399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fault detection and exclusion used in a global positioning system GPS receiver
Assignee: Honeywell International Inc
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Filing: 1997-04-10
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Granted: 1998-11-24
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Expires: 2017-04-10
Abstract
Abstract A fault exclusion (FE) system for a global positioning system (GPS) receiver which upon detection of a faulty satellite, for example, by a fault detection (FD) system, such as a receiver autonomous integrity monitoring (RAIM) system. The FE system computes the test statistics for all satellites and ranks the satellites in descending order of their test statistics. The FE system excludes data from the satellites one at a time starting with the satellites at the top of the list. Should a subsequent satellite anomaly be detected, the FE system excludes satellites based on the test statistics computed for the previous satellite anomaly condition. The FE system proceeds down the list until the fault detection condition is cleared or the list is exhausted without affecting the availability of the FD system.
Inventors
- 👤 Jimmy Y. Yu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:05
CPC Classifications
G; G01; G01S; G01S19/00; G01S19/01; G01S19/13; G01S19/20
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
95 words
A fault detection and exclusion system for detecting satellite anomalies in a global positioning system (GPS) and excluding the data from the satellite with the anomaly from the navigation solution, the system comprising: means for detecting a first and a second satellite anomaly; means for computing the test statistics for a predetermined number of satellites at least when said first satellite anomaly is detected; and means for excluding data from one of the satellites, when said second satellite anomaly is detected, as a function of the test statistics calculated for said first satellite anomaly condition.
Claim 2
Dependent Claim
95 words
A fault detection and exclusion system for detecting satellite anomalies in a global positioning system (GPS) and excluding the data from the satellite with the anomaly from the navigation solution, the system comprising: means for detecting a first and a second satellite anomaly; means for computing the test statistics for a predetermined number of satellites at least when said first satellite anomaly is detected; and means for excluding data from one of the satellites, when said second satellite anomaly is detected, as a function of the test statistics calculated for said first satellite anomaly condition.
Claim 3
Dependent Claim
32 words
The fault detection and exclusion system as recited in claim 1, wherein said excluding means includes means for ranking the satellites in descending order as a function of the computed test statistic.
Claim 4
Dependent Claim
36 words
The fault detection and exclusion system as recited in claim 2, further including means for excluding satellites in order of descending test statistics until the satellite anomaly is no longer detected or the list is exhausted.
Claim 5
Dependent Claim
26 words
The fault detection and exclusion system as recited in claim 2, further including means for checking for satellite anomalies after each of said satellites is excluded.
Claim 6
Dependent Claim
23 words
The fault detection and exclusion system as recited in claim 1, wherein said detecting means includes a receiver autonomous integrity monitoring (RAIM) system.
Claim 7
Dependent Claim
69 words
A fault exclusion system for use with a detection system which detects satellite anomalies for GPS receiver for excluding data from a satellite providing incorrect navigational data, the system comprising: means for computing the test statistics for a predetermined number of satellites; and means for excluding data from satellites during a later satellite anomaly condition as a function of the test statistic computed for a previous satellite anomaly condition.
Claim 8
Dependent Claim
69 words
A fault exclusion system for use with a detection system which detects satellite anomalies for GPS receiver for excluding data from a satellite providing incorrect navigational data, the system comprising: means for computing the test statistics for a predetermined number of satellites; and means for excluding data from satellites during a later satellite anomaly condition as a function of the test statistic computed for a previous satellite anomaly condition.
Claim 9
Dependent Claim
25 words
The fault exclusion system as recited in claim 6, further including means for ranking the satellites in descending order according to the computed test statistics.
Claim 10
Dependent Claim
35 words
The fault exclusion system as recited in claim 7, wherein said excluding means is responsive to said ranking means for excluding satellites in descending order test statistics until said satellite anomaly is no longer detected.
Claim 11
Dependent Claim
36 words
The fault exclusion system as recited in claim 7, further including means for comparing said test statistics with a predetermined threshold and maintaining a list of satellites whose test statistics are less than said predetermined threshold.
Claim 12
Dependent Claim
29 words
The fault exclusion system as recited in claim 6, further including means for enabling said fault exclusion system only when said fault detection system has detected a satellite anomaly.
Claim 13
Dependent Claim
25 words
The fault exclusion system as recited in claim 7, wherein said fault exclusion system is only enabled when a predetermined number of satellites are available.
Claim 14
Dependent Claim
19 words
The fault exclusion system as recited in claim 11, wherein said predetermined number of satellites is at least six.
Claim 15
Dependent Claim
26 words
The fault exclusion system as recited in claim 9, wherein said fault exclusion system is enabled only when five satellites and an altitude input are available.
Claim 16
Independent Claim
71 words
A method for excluding data from a GPS satellite after a satellite anomaly has been detected, the method comprising the steps of: (a) computing the test statistics of each of the satellites; (b) excluding data from a satellite as a function of the test statistics; and (c) excluding data from a satellite upon detection of a subsequent satellite anomaly based on the test statistics computed for a previously detected satellite anomaly.
Claim 17
Independent Claim
71 words
A method for excluding data from a GPS satellite after a satellite anomaly has been detected, the method comprising the steps of: (a) computing the test statistics of each of the satellites; (b) excluding data from a satellite as a function of the test statistics; and (c) excluding data from a satellite upon detection of a subsequent satellite anomaly based on the test statistics computed for a previously detected satellite anomaly.
Claim 18
Dependent Claim
43 words
The method as recited in claim 14, wherein said test statistics are ranked in a list in descending order and said satellites are excluded one at a time starting from the top of the list until a satellite anomaly is no longer detected.
Claim 19
Dependent Claim
29 words
The method as recited in claim 15, further including the step of: comparing the test statistics with a predetermined threshold and identifying those test statistics below said predetermined threshold.
Claim 20
Independent Claim
143 words
A method for excluding data from a GPS satellite, comprising the steps of: (a) receiving a signal from a plurality of GPS satellites; (b) computing a first test statistic for said satellites; (c) detecting a first anomaly condition based on said first test statistic; (d) excluding one of said plurality of GPS satellites from a first navigation solution when said first anomaly condition is detected; (e) computing a second test statistic for said GPS satellites wherein said second test statistic does not include a test statistic for said one GPS satellite excluded from said first navigation solution (f) detecting a second anomaly condition based on said second test statistic; and (g) determining a satellite to be excluded from a second navigation solution by evaluating said second test statistic and said test statistic for said one GPS satellite excluded from said first navigation solution.
Claim 21
Independent Claim
143 words
A method for excluding data from a GPS satellite, comprising the steps of: (a) receiving a signal from a plurality of GPS satellites; (b) computing a first test statistic for said satellites; (c) detecting a first anomaly condition based on said first test statistic; (d) excluding one of said plurality of GPS satellites from a first navigation solution when said first anomaly condition is detected; (e) computing a second test statistic for said GPS satellites wherein said second test statistic does not include a test statistic for said one GPS satellite excluded from said first navigation solution (f) detecting a second anomaly condition based on said second test statistic; and (g) determining a satellite to be excluded from a second navigation solution by evaluating said second test statistic and said test statistic for said one GPS satellite excluded from said first navigation solution.
References Cited (Backward Citations)
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