Signal conversion device for coupling RTCM correction data to a position determination device
First Claim
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1. A signal conversion device comprising:
- a radio receiver adapted to receive correction signals that are formatted in a RTCM format and that are transmitted over a first frequency;
a format converter coupled to said radio receiver and adapted to convert received correction signals into converted correction data, said converted correction data in a format adapted to be received by a position determination device;
a modulator coupled to said format converter and coupled to said transmitter for modulating said converted correction data to a second frequency;
a transmitter coupled to said format converter, said transmitter for transmitting said converted correction signals at said second frequency so as to generate a local beacon; and
a housing adapted to be carried on a user, said radio receiver, said format converter, said modulator, and said transmitter disposed in said housing.
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Abstract
A signal conversion device that provides RTCM correction data to a position determination device. The signal conversion device receives RTCM signals that are converted into a frequency adapted to be received by a position determination device so as to produce a converted correction signal. In one embodiment, the signal conversion device also converts the received RTCM correction data into a format that is adapted to be received by the position determination device. In one embodiment, the received RTCM signal is converted into is the Wide Area Augmentation System (WAAS) format. Alternatively, the signal is converted into a different format such as a particular manufacturer'"'"'s own format. The converted correction signal is coupled to a position determination device via a wireless link. The position determination device uses the RTCM correction data contained in the converted correction signal for accurately determining position.
11 Citations
15 Claims
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1. A signal conversion device comprising:
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a radio receiver adapted to receive correction signals that are formatted in a RTCM format and that are transmitted over a first frequency;
a format converter coupled to said radio receiver and adapted to convert received correction signals into converted correction data, said converted correction data in a format adapted to be received by a position determination device;
a modulator coupled to said format converter and coupled to said transmitter for modulating said converted correction data to a second frequency;
a transmitter coupled to said format converter, said transmitter for transmitting said converted correction signals at said second frequency so as to generate a local beacon; and
a housing adapted to be carried on a user, said radio receiver, said format converter, said modulator, and said transmitter disposed in said housing. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A position determination system comprising:
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a signal conversion device including an antenna adapted to receive RTCM signals that include RTCM correction data, said signal conversion device including a radio receiver coupled to said antenna for demodulating said RTCM signals so as to obtain RTCM correction data, a modulator coupled to said radio receiver for modulating said RTCM correction data into a frequency adapted to be received by a position determination device so as to produce a converted correction signal, and a transmitter for transmitting said converted correction signal so as to generate a local beacon, said signal conversion device including a housing adapted to be carried on a user, said antenna, said radio receiver, said modulator, said transmitter, and said controller disposed within said housing; and
a hand-held position determination device that is adapted to receive said converted correction signal transmitted by said signal conversion device, said position determination device adapted to use said converted correction signal for accurately determining position. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
a format converter coupled to said radio receiver for converting said RTCM correction data into a WAAS format.
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10. The position determination system of claim 9 wherein said format converter is coupled to said modulator, and wherein said modulator is operable to modulate said correction data as required by said WAAS format.
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11. The position determination system of claim 7 further comprising:
a format converter coupled to said radio receiver for converting said RTCM correction data into a particular manufacturer'"'"'s format, said format converter coupled to said modulator such that received correction data is modulated as required by said particular manufacturer'"'"'s format.
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12. The signal conversion device of claim 7 wherein said modulator converts received RTCM signals into a frequency that is in an unlicensed frequency band.
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13. The signal conversion device of claim 7 wherein said modulator converts received RTCM signals into a frequency in the range of 2.4 Gigahertz.
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14. The signal conversion device of claim 7 further comprising a controller for controlling operations.
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15. A method for providing RTCM correction data to a position determination device comprising:
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receiving RTCM signals containing RTCM correction data at a signal conversion device that is adapted to be carried on a user;
demodulating said RTCM signals at said signal conversion device so as to obtain RTCM correction data;
converting said RTCM correction data, at said signal conversion device, into a WAAS format;
converting said RTCM correction data, at said signal conversion device, into a frequency adapted to be received by a position determination device so as to produce a converted correction signal; and
transmitting, from said signal conversion device, said converted correction signal so as to generate a local beacon.
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Specification
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Current AssigneeTrimble Navigation Limited (Trimble Inc.)
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Original AssigneeTrimble Navigation Limited (Trimble Inc.)
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InventorsGreen, James C.
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Primary Examiner(s)Blum, Theodore M.
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Application NumberUS09/120,961Time in Patent Office1,231 DaysField of Search342/357.09, 342/357.1, 342/357.02US Class Current342/357.44CPC Class CodesG01S 19/074 providing integrity data, e...G01S 5/009 Transmission of differentia...
