Several DSP methods have been synthetically analyzed and compared with respect to the expected errors for an
ultrasonic range measurement arrangement. These included L1, L2 norms and correlation. Conventional threshold-detecting techniques give errors in the range of several millimeters to centimeters using the low-bandwidth transducers currently available for operation in air.In contrast, DSP methods achieve orders of magnitude better accuracies Correlation is the best method with low S/N ratio the sampling rate being the limiting factor. Furthermore
CONCLUSion
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