Patent ID: 6307622
Filing Date: 2001-10-23
Classification: G01S,G06K

Abstract:
A system for detecting and ranging objects comprising:sequence generating means for providing a binary code having an autocorrelation function with negative sidelobes;transmitting means electrically coupled to said sequence generating means for emitting a transmission signal that is representative of said binary code;reception means operatively associated with said transmitting means for receiving a return signal;first correlating means connected to said reception means and said sequence generating means for comparing said return signal with a first correlation signal to produce a first autocorrelation signal, said first correlation signal being said binary code with a selected time delay;second correlating means connected to said reception means and said sequence generating means for comparing said return signal with a second correlation signal to produce a second autocorrelation signal, said second correlation signal being said first correlation signal with a preselected delay period;calculating means electrically coupled to said first and second correlating means for generating a sum signal and a difference signal, said sum signal being at least partially based on combining said first and second autocorrelation signals, said difference signal being at least partially based on a difference between said first and second autocorrelation signals; andprocessing means for analyzing said sum and difference signals to determine whether said return signal is an echo of said transmission signal from a target.