Object Detection
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United States of America Patent
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Issued Date -
Dec 3, 2009
app pub date -
Oct 23, 2006
filing date -
Oct 24, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An object is detected by generating a binary signal having an irregular sequence of states and in which transitions between states occur at varying time offsets with respect to a nominal regular clock. The binary signal is transmitted, and a reflection of the transmitted signal is processed with a reference version of the binary signal. The reference signal is delayed, and then used to sample the reflected signal. The samples are used to derive a combined value representing the average time derivative of the reflected signal at locations within the reflected signal which substantially correspond to the times of the transitions in the reference signal. The presence of an object at a range corresponding to the delay is determined from the combined value.
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