Method for determining echo distance using autocorrelation

Details Method for determining echo distance using autocorrelation Method for determining echo distance using autocorrelation

G - Physics

01

S

G01S 15/08 (2006.01) G01F 23/296 (2006.01) G01S 7/527 (2006.01) G01S 15/10 (2006.01)

Patent

CA 2405656

A method and system for echo processing a receive signal using autocorrelation. A receive signal is sampled, digitized and high-pass filtered. A correlation signal is created by adding the filtered signal to a copy of the filtered signal shifted by a time unit. A set of correlation signals is created by repeating the process for a range of time units corresponding to a set of sequential sample points. Each correlation signal has a correlation indicator evidencing the strength of the correlation. The correlation signal having the highest correlation strength is identified, and the time shift used to create it is identified as the time of flight of the echo pulse. The echo distance is then calculated based upon the time of flight and the speed of propagation of the echo in the environment. The correlation indicator may the maximum peak value of the correlation signal.

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