Wide augmentation system retrofit receiver
First Claim
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1. A Global Positioning System (GPS) Wide Area Augmentation System (WAAS) retrofit receiver comprising:
- a) an antenna;
b) a receiver coupled to said antenna to receive a WAAS message via said antenna, said receiver further adapted to translate said WAAS message into an RTCM (Radio Technical Commission for Maritime Services) message; and
c) a communications port included in said receiver, said communications port adapted to implement a communications link and couple said RTCM message to a GPS receiver via said communications link such that said GPS receiver can utilize said WAAS message without modification of said GPS receiver.
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Abstract
The present invention comprises a Global Positioning System (GPS) Wide Area Augmentation System (WAAS) retrofit receiver. In one embodiment the present invention includes a receiver adapted to receive WAAS messages via an antenna. The receiver is further adapted to translate the WAAS messages into RTCM SC-104 standard messages and transmit the messages to an external GPS receiver via a communications link. In so doing, the external GPS receiver is able to utilize the WAAS messages without modification of the external GPS receiver.
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Citations
16 Claims
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1. A Global Positioning System (GPS) Wide Area Augmentation System (WAAS) retrofit receiver comprising:
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a) an antenna; b) a receiver coupled to said antenna to receive a WAAS message via said antenna, said receiver further adapted to translate said WAAS message into an RTCM (Radio Technical Commission for Maritime Services) message; and c) a communications port included in said receiver, said communications port adapted to implement a communications link and couple said RTCM message to a GPS receiver via said communications link such that said GPS receiver can utilize said WAAS message without modification of said GPS receiver. - View Dependent Claims (2, 3, 4, 5)
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6. A Global Positioning System (GPS) Wide Area Augmentation System (WAAS) retrofit receiver comprising:
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a receiver adapted to receive a WAAS signal; said receiver adapted to determine a WAAS message conveyed by said WAAS signal, said receiver adapted to interpret said WAAS message and to translate said WAAS message into an RTCM (Radio Technical Commission for Maritime Services) message and couple said RTCM message to an external GPS receiver such that said external GPS receiver can utilize said WAAS message without modification of said external GPS receiver. - View Dependent Claims (7, 8, 9, 10)
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11. With a differential Global Positioning System (DGPS) receiver designed to accept a Radio Technical Commission for Maritime Service (RTCM) format message, a method of retrofitting the DGPS receiver to accept a Wide Area Augmentation System (WAAS) format message, the method comprising the steps of:
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a) receiving a WAAS message with a receiver; b) interpreting said WAAS message; c) translating said WAAS message into an RTCM message; and d) coupling said RTCM message to an external GPS receiver adapted to receive said RTCM message such that said external GPS receiver can utilize said WAAS message without modification of said external GPS receiver. - View Dependent Claims (12, 13, 14, 15)
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16. With a differential Global Positioning System (DGPS) receiver designed to accept a Radio Technical Commission for Maritime Service (RTCM) format message, a method of retrofitting the GPS receiver to accept a Wide Area Augmentation System (WAAS) format message and processing orbital data changes in global positioning system (GPS) messages, the method comprising the steps of:
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a) receiving a GPS message; b) detecting a change in a GPS satellite issue of data; c) determine a differential correction adjusting for said change in said GPS satellite issue of data; d) subtracting said differential correction from a previous differential correction to obtain a delta differential correction; e) translating said differential correction into an RTCM Message Type 1; f) translating said delta differential correction into an RTCM Message Type 2; and g) coupling said RTCM message type 1 and said RTCM Message Type 2 to an external DGPS receiver capable of receiving said RTCM messages such that said external DGPS receiver processes without causing a position discontinuity or error in said external DGPS receiver.
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Specification