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PGA460: The Problem of Measuring Distance by PGA460 DEMO

Amy Luo
Expert 6895 points
Part Number: PGA460

Hi Team,

When customers use PGA460 DEMO to measure distance, they encounter some problems, which are described as follows:

An adult, about 1.8 meters, was standing in front of the radar probe. When the adult was more than a meter away from the probe, the results were inaccurate. Most of the time, Gui software directly shows that the test results are about 11 meters away, but the actual distance is 1-2 meters.Do you have any suggestions to solve the problem?

Best Regards,

Amy

  • 0
    TI__Mastermind 27950 points

    Hi Amy,

    When the GUI reports a distance of 11.286m, this is the equivalent of no object being detected. This is because the ultrasonic measurement result command returns a value of 0xFFFF microseconds when no object is detected, which is approximately 11.286m when converted to distance assuming the speed of sound through air is 343m/s.

    Assuming the customer is using the fixed threshold level at the mid-code level of 128 (as shown in the screen capture), I can understand how detection of long range objects can be a challenge. The customer must lower the threshold level to detect objects at 1.8m or further.

    Please refer to the Ultrasonic Sensing with the PGA460-Q1 video training series on how to configure the threshold levels and other device settings to optimize long range performance.