Apparatus and method for coupling data to a position determination device
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United States of America Patent
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Oct 23, 2001
Issued Date -
N/A
app pub date -
Feb 24, 1999
filing date -
Jul 22, 1998
priority date (Note) -
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Abstract
A method and apparatus for coupling data from an external data device to a position determination device. An Auxiliary Data Transmission Unit (ADTU) that includes a radio transmitter couples to the external data device. The ADTU receives serial data from the external data device and encodes the received serial data into a format suitable for receipt by the position determination device. The encoded data is then modulated to produce a radio signal that is transmitted to the position determination device in a scheme that permits multiple devices to communicate with the position determination device without interference.
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