Patent ID: 6531977
Filing Date: 2003-03-11
Classification: G01F,G01S

Abstract:
An apparatus for detecting the centers of baseband transmit and echo pulses of a radar or time domain reflectometer (TDR), comprising:a threshold comparator for producing transmit and echo detection pulses from the baseband transmit and echo pulses; a leading-edge triggered logic element for producing a leading-PWM (pulse width modulation) pulse that starts with the leading edge of the transmit detection pulse and ends with the leading edge of the echo detection pulse; a trailing-edge triggered logic element for producing a trailing-PWM (pulse width modulation) pulse that starts with the trailing edge of the transmit detection pulse and ends with the trailing edge of the echo detection pulse; a first digital counter for producing a count output proportional to the leading-PWM pulse; a second digital counter for producing a count output proportional to the trailing-PWM pulse; a digital adder connected to the first and second counter outputs to produce a center detected output.