Patent ID: 6762712
Filing Date: 2004-07-13
Classification: G01C,G01S,H04B

Abstract:
A first-arriving pulse detector circuitry, comprising:a correlator circuitry configured to correlate a received signal with a template signal to provide an output signal, in which the received signal comprises an ultra-wideband signal, wherein the received signal comprises a plurality of pulses that result from a transmission of a radio-frequency pulse into a multipath propagation medium, and wherein the plurality of pulses of the received signal comprises the first-arriving pulse, in which the correlator circuitry further comprises: a multiplier circuitry configured to provide an output signal that comprises the product of the template signal and the received signal; and an integrator circuitry configured to integrate the output signal of the multiplier circuitry to provide the output signal of the correlator circuitry; and a threshold circuitry configured to, in response to the first-arriving signal in the received signal, provide a first-arriving-pulse signal depending on the relative values of the output signal of the correlator circuitry and a threshold signal derived from a noise floor, in which the threshold circuitry further comprises a comparator circuitry configured to compare the output signal of the correlator circuitry with the threshold signal to provide the first-arriving-pulse signal, in which the first-arriving-pulse signal tends to indicate a time position of the first-arriving pulse in the received signal, in which the threshold signal comprises a first number added to the product of a second number and a third number, in which the first number comprises the average of the noise floor, the second number comprises the standard deviation of the noise floor, and the third number comprises a scaling factor.