Time-gated delay lock loop tracking of digital television signals
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United States of America Patent
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N/A
Issued Date -
Sep 26, 2002
app pub date -
Jan 22, 2002
filing date -
Feb 2, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A computer program product, apparatus, and method for use in determining the position of a user terminal includes receiving at the user terminal a digital television (DTV) broadcast signal transmitted by a DTV transmitter; tracking a periodic component of the DTV signal using a delay lock loop (DLL), including selecting an observation interval based on the timing of the periodic component, and turning on a portion of the DLL during the observation interval, and turning the portion off otherwise; and determining a pseudo-range between the user terminal and the DTV transmitter based on the DTV broadcast signal; and wherein the position of the user terminal is determined based on the pseudo-range and a location of the DTV transmitter.
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