Communications: electrical – Continuously variable indicating – With calculation
Patent
1997-07-30
1999-07-27
Horabik, Michael
Communications: electrical
Continuously variable indicating
With calculation
371 36, 371 691, G06F 1108
Patent
active
059297832
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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Brabender Jeffery W.
King Dennis D.
Horabik Michael
Raytheon Company
Wong Albert K.
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