I am currently using 2 ping sonar units deployed in two ice thickness sensors I have built. The pings are attached to a buoy by means of an arm that extends down into the water about 750mm and the sonars are facing up to calculate the distance to ice water interface and are driven by a Raspberry Pi Zero at about 1Hz. Both setups are for all intents and purposes identical, but in different sections of a pond that’s been sectioned with a floating boom and a weighted plastic sheet hanging down to minimize mixing. The two units are about 10m from each other.
One of them is working beautifully, really rock solid. Shown below:
[posted in first reply since new users can only upload one piece of media at a time]
But the other is significantly noisier, and getting worse:
Both plots are over 48hrs. The ice characteristics, as far as I can tell, are very similar between the two units. Could it be cross-talk? but if so why is it only showing up on one unit, and why is it getting worse? I’ve tried rebooting the unit several times, but it hasn’t seemed to have an effect.