Communications: directive radio wave systems and devices (e.g. – Radar transponder system
Reexamination Certificate
2007-04-24
2007-04-24
Gregory, Bernarr E. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
C342S043000, C342S051000, C342S118000, C342S125000, C342S175000, C342S192000, C342S193000, C342S195000
Reexamination Certificate
active
10840353
ABSTRACT:
A system and method for performing distance measurement using wireless signals. A time of flight calculation is enabled by an interrogating device that transmits an interrogation signal to a responding device, which returns a synchronized signal back to the interrogating device. The wireless signals between the interrogating device and the receiving device have a harmonic relationship. In one embodiment, a time shift of a received signal relative to a transmitted interrogation signal is determined based on a comparison of a first reference point on a signal representative of the transmitted interrogation signal and a second reference point on a signal representative of the received signal.
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