Method, apparatus, system, and computer software program product for determining position integrity in a system having a global navigation satellite system (GNSS) component
First Claim
1. A method for determining position integrity in a system having a Global Navigation Satellite System (GNSS) component, comprising:
- selectively determining whether valid position integrity information is available for an alarm limit in a plurality of successive alarm limits, with each alarm limit corresponding to a position integrity level;
determining the position integrity level corresponding to the alarm limit at which valid position integrity information is first available; and
designating a default position integrity level if valid position integrity information is unavailable for any of the alarm limits.
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Accused Products
Abstract
A method is provided for determining position integrity in a system having a Global Navigation Satellite System (GNSS) component, such as, for example, a Global Positioning System (GPS) device. For successive alarm limits, with each alarm limit corresponding to a position integrity level, it is determined whether valid position integrity information is available. At the alarm limit at which valid position integrity information is first available, a corresponding position integrity level is determined. If no valid position integrity information is available for any of the alarm limits, a default position integrity level is then designated. An associated apparatus, system, and computer software program product are also provided.
66 Citations
39 Claims
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1. A method for determining position integrity in a system having a Global Navigation Satellite System (GNSS) component, comprising:
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selectively determining whether valid position integrity information is available for an alarm limit in a plurality of successive alarm limits, with each alarm limit corresponding to a position integrity level;
determining the position integrity level corresponding to the alarm limit at which valid position integrity information is first available; and
designating a default position integrity level if valid position integrity information is unavailable for any of the alarm limits. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for determining position integrity information, and transmitting at least one of position accuracy information and position integrity information, in a system having a Global Navigation Satellite System (GNSS) component, comprising:
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a transponder configured to transmit a type code indicative of at least one of position accuracy information and position integrity information;
a navigational device capable of executing a Receiver Autonomous Integrity Monitoring (RAIM) algorithm to determine whether valid position integrity information is available; and
a processing unit in communication with the transponder and the navigational device, the processing unit being configured to selectively provide successive alarm limits to the RAIM algorithm executed by the navigational device, the processing unit being further configured to determine a valid position integrity level corresponding to the alarm limit at which valid position integrity information is first available and to designate a default position integrity level if valid position integrity information is unavailable for any of the alarm limits, the processing unit thereafter being configured to direct to the transponder at least one of the valid position integrity level, the default position integrity level, and a position accuracy level corresponding to at least one of the valid position integrity level and the default position integrity level, from which the transponder thereafter determines the corresponding type code for transmission. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A system capable of determining position integrity information, and transmitting at least one of position accuracy information and position integrity information, in an apparatus having a Global Navigation Satellite System (GNSS) component, comprising:
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a computer device comprising;
a first processing portion for directing the execution of a Receiver Autonomous Integrity Monitoring (RAIM) algorithm to determine whether valid position integrity information is available;
a second processing portion for selectively providing successive alarm limits to the RAIM algorithm so as to determine a valid position integrity level corresponding to the alarm limit at which valid position integrity information is first available;
a third processing portion for designating a default position integrity level if no valid position integrity information is available for any of the alarm limits; and
a fourth processing portion for directing to a transponder at least one of the valid position integrity level, the default position integrity level, and a position accuracy level corresponding to at least one of the valid position integrity level and the default position integrity level, from which the transponder thereafter determines the corresponding type code for transmission. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A computer software program product for determining position integrity information, and transmitting at least one of position accuracy information and position integrity information, in a system having a Global Navigation Satellite System (GNSS) component, comprising:
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a first executable portion configured to direct the execution of a Receiver Autonomous Integrity Monitoring (RAIM) algorithm to determine whether valid position integrity information is available;
a second executable portion configured to selectively provide successive alarm limits to the RAIM algorithm so as to determine a valid position integrity level corresponding to the alarm limit in the sequence at which valid position integrity information is first available;
a third executable portion configured to designate a default position integrity level if no valid position integrity information is available for any of the alarm limits; and
a fourth executable portion configured to direct to a transponder at least one of the valid position integrity level, the default position integrity level, and a position accuracy level corresponding to at least one of the valid position integrity level and the default position integrity level, from which the transponder thereafter determines the corresponding type code for transmission. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39)
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Specification