Rate locked loop radar timing system
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United States of America Patent
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Jun 23, 2009
Grant Date -
Aug 2, 2007
app pub date -
Jan 30, 2006
filing date -
Jan 30, 2006
priority date (Note) -
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Abstract
A rate locked loop (RLL) regulates phase slip between two clock signals to provide precision timing for radar, TDR and laser ranging systems. Two clocks having a small mutual frequency offset exhibit a slowing changing relative phase, or phase slip, that produces a stroboscopic time expansion effect in a ranging system. A phase detector converts clock phase to voltage and the voltage is differentiated to provide a rate-of-change signal to a loop controller that precisely regulates the rate-of-phase change. The RLL controls a VCO to produce a constant, linear phase slip having phase errors below the time equivalent of 1-picosecond.
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