Patent ID: 6137438
Filing Date: 2000-10-24
Classification: B60R,G01F,G01S

Abstract:
A precision pulse-echo ranging apparatus comprising:a transmit antenna;a transmitter connected to the transmit antenna;a transmit reference antenna collocated with the transmit antenna;a transmit reference equivalent time (ET) sampler connected to the transmit reference antenna;a receive antenna;a receive equivalent time (ET) sampler connected to the receive antenna;pulse detectors responsive to the transmit reference ET sampler and the receive ET sampler outputs;a first gate pulse generator connected to a first pulse detector to gate off the first pulse detector after a defined delay interval following pulse detection;a second gate pulse detector connected to a second pulse detector to enable the second pulse detector after a defined delay interval following pulse detection from the first pulse detector;circuitry responsive to the pulse detectors to produce an output indicating target range.