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SB pings as received by RTT/SBR systems show a significant deviation around their actual time-of-flight as a result of reflection/interference/environmental noise (in raw and potable water) and further from fluid inhomogeneity in wastewater. This requires SBA to interpolate a v-shape to determine the precise passage time. I believe using a linearly increasing ultrasonic signal (classically called a chirp) along with a more sophisticated correlation receiver could a) provide a significant improvement to raw/potable water tracking accuracy, and b) potentially make tracking in waster water viable in scenarios where it is currently difficult. Note this would be research to implement on the next-gen SB as the current gen HW cannot efficiently generate a chirp with its tuned resonant driver.
Client asked if there was a way to use Bluetooth technology to help with tracking which would preserve battery for longer live time.