Spread spectrum frequency hopping reader system
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United States of America Patent
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Oct 27, 1998
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N/A
app pub date -
Mar 21, 1996
filing date -
Mar 21, 1996
priority date (Note) -
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Abstract
An apparatus for sourcing an interrogation signal for use in a object identification system including a frequency hopping source for generation of an interrogation signal which is coupled to a homo dyne radio for transmission by a bi-directional antenna to a tag. Upon receipt, the tag provides a return signal that is backscatter modulated to include tag identification or other data which is processed by the sourcing system. The frequency hopping source includes a voltage controller oscillator which is driven by a pseudo random code generator for selecting one of a plurality of hopping frequencies at which the interrogation signal is to be generated based on the available bandwidth.
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