Inexpensive monitoring technique for achieving high level integrity monitoring for differential GPS
First Claim
1. An integrity monitor global positioning system (GPS) navigation system, comprising:
- a primary GPS receiver adapted to determine a first position, said primary GPS receiver certified to a first certification level, said primary GPS receiver further adapted to provide GPS navigation data; and
a secondary GPS receiver coupled to said primary GPS receiver, said secondary GPS receiver certified to a second certification level having less stringent requirements than said first certification level, said secondary GPS receiver adapted to determine a second position and monitor said primary GPS receiver to detect a fault condition by comparing said first position and said second position, such that said secondary GPS, receiver ensures the integrity of said primary GPS receiver and ensures said GPS navigation data is provided in accordance with said first certification level.
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Accused Products
Abstract
A dual global positioning system (GPS) receiver navigation system. The system of the present invention includes a primary GPS receiver adapted to determine a first position. The primary GPS receiver is certified to a first integrity level and is further adapted to provide GPS navigation data to an external device. The system of the present invention also includes a secondary GPS receiver coupled to the primary GPS receiver. The secondary GPS receiver is certified to a second integrity level having less stringent requirements than the first integrity level. The secondary GPS receiver is adapted to determine a second position and monitor the primary GPS receiver to detect a fault condition by comparing the first position and the second position, such that the GPS navigation data is provided in accordance with the first certification level regardless of the second integrity level of the secondary GPS receiver.
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Citations
22 Claims
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1. An integrity monitor global positioning system (GPS) navigation system, comprising:
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a primary GPS receiver adapted to determine a first position, said primary GPS receiver certified to a first certification level, said primary GPS receiver further adapted to provide GPS navigation data; and a secondary GPS receiver coupled to said primary GPS receiver, said secondary GPS receiver certified to a second certification level having less stringent requirements than said first certification level, said secondary GPS receiver adapted to determine a second position and monitor said primary GPS receiver to detect a fault condition by comparing said first position and said second position, such that said secondary GPS, receiver ensures the integrity of said primary GPS receiver and ensures said GPS navigation data is provided in accordance with said first certification level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An integrity monitor differential global positioning system (GPS) navigation system, comprising:
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a radio receiver adapted to receive a GPS differential correction message from a broadcast; a GPS sensor coupled to receive said differential correction message from said radio receiver, said GPS sensor adapted to determine a first position using said differential correction message, said GPS sensor further adapted to provide navigation data directly to a plurality of primary flight instruments of an aircraft, said GPS sensor certified to a first certification level; and a GPS monitor coupled to said GPS sensor, said GPS monitor coupled to receive said differential correction message from said radio receiver, said GPS monitor certified to a second certification level below said first certification level, said GPS monitor adapted to determine a second position using said differential correction message and monitor said GPS sensor to detect a fault condition by comparing said first position and said second position, such that said GPS monitor ensures the integrity of said GPS sensor and ensures said navigation data is provided in accordance with said first certification level. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. In an integrity monitor differential global positioning system (GPS) navigation system, a method for providing high integrity navigation data for aircraft navigation, the method comprising the steps of:
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a) receiving a GPS (global positioning system) signal; b) receiving a GPS differential correction message from a broadcast by using a radio receiver; c) determining a first position from said differential correction message and said GPS signal using a GPS sensor certified to a first certification level; d) providing navigation data directly to a plurality of primary flight instruments of an aircraft by using said GPS sensor; e) determining a second position from said differential correction message and said GPS signal using a GPS monitor certified to a second certification level having less stringent requirements than said first certification level; f) ensuring said navigation data complies with the requirements of said first certification level by comparing said first position and said second position to detect a fault condition; and g) ensuring the integrity of said GPS sensor by comparing said first position and said second position. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification