Coded data generation or conversion – Code generator or transmitter – With variable pulse spacing or grouping
Patent
1995-09-11
1997-11-25
Hofsass, Jeffery
Coded data generation or conversion
Code generator or transmitter
With variable pulse spacing or grouping
341173, 342 47, 342357, G01S 502
Patent
active
056917236
ABSTRACT:
A method and apparatus for encoding and decoding data on navigation signal pulse pairs utilizes pulse position modulation (PPM). The pulse interval between a first pulse and a second pulse of the pulse pair is varied depending on whether the logic value of the data to be encoded is a logic "0" or a logic "1". A tri-graph encoding process converts the raw input data into encoded input data. Each input data bit is encoded into three bits with each bit having the same logical value as the input data bit. The encoded input data is then encoded on the navigation signal using a pulse position modulation (PPM) technique. A decoder recovers the encoded data and provides an error correction process for high data integrity that corrects certain bit errors that may occur during the transmission and reception of the data on the navigation signal. The error correction process detects and corrects errors such as a missing bit, an extra bit or a bit error.
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Relative GPS Using DME/TACAN Data Link, James D. Waid and Dennis King, presented to Institute of Navigation (ION) GPS-94 on Sep. 20-23, 1994, Salt Lake City, Utah.
Brabender Jeffery W.
King Dennis D.
E-Systems Inc.
Hofsass Jeffery
Meier Harold E.
Wong Albert K.
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