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PGA460: The distance measurement results are not accurate

Cherry Zhou
Mastermind 22235 points
Part Number: PGA460

Hi team,

Using the distance measurement module built by the PGA460, it was found that changing the gain size, number of pulses triggered, or current size without changing the actual distance would result in a centimeter-wide jump in the measurement results which will affect accuracy very much. The customer would like to know is there any way to fix it? Thanks.

Best Regards,

Cherry

  • 0
    TI__Mastermind 23045 points

    Hello Cherry,

    Thanks for posting to the sensing forum! 

    The accuracy and margin of error is primarily dependent on where the threshold level and the echo envelope intersect. The closer the threshold level is to the noise floor, the more accurate the result. So if their threshold configuration is not great and the measurement could be easily be impacted by other settings as they have noticed. Also note that the accuracy tends to decrease if the echo appears in the ring-decay window, which is where very close range objects tends to sit.

    I would recommend the customer to read out app note PGA460 Ultrasonic Module Hardware and Software Optimization to understand how to optimize different aspects of the PGA460 signal for improved accuracy.

    Best,

    Isaac