| CPC G01S 15/58 (2013.01) [G01S 15/931 (2013.01); G01S 2015/932 (2013.01)] | 20 Claims |
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1. An acoustic sensing method that comprises:
driving an acoustic transducer to send acoustic bursts each including an up-chirp in a first frequency band and a down-chirp in a second frequency band;
receiving echo signals responsive to the acoustic bursts from the transducer; and
using the echo signals to determine a distance or time of flight from the transducer.
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