Communications: directive radio wave systems and devices (e.g. – Base band system
Reexamination Certificate
2006-08-22
2008-11-04
Gregory, Bernarr E (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Base band system
C342S027000, C342S089000, C342S118000, C342S124000, C342S134000, C342S135000, C342S175000, C342S195000, C375S256000, C375S316000, C375S320000, C375S340000, C329S311000, C329S347000, C073S29000R, C073S30400R, C324S629000, C324S637000, C324S642000, C324S644000
Reexamination Certificate
active
07446695
ABSTRACT:
A precision pulse detection system for time-of-flight sensors detects a zero axis crossing of a pulse after it crosses above and then falls below a threshold. Transmit and receive pulses flow through a common expanded-time receiver path to precision transmit and receive pulse detectors in a differential configuration. The detectors trigger on zero axis crossings that occur immediately after pulse lobes exceed and then drop below a threshold. Range errors caused by receiver variations cancel since transmit and receive pulses are affected equally. The system exhibits range measurement accuracies on the order of 1-picosecond without calibration even when used with transmitted pulse widths on the order of 500 picoseconds. The system can provide sub-millimeter accurate TDR, laser and radar sensors for measuring tank fill levels or for precision radiolocation systems including digital handwriting capture.
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