US-D1 (uLanding) Incorrect Altitudes

I am trying to use Ainstein’s US-D1 (formerly uLanding) for terrain following applications. Currently using Copter v3.6 and a PX4. The sensor has its own power source (5V @10A) and using serial connection.

The sensor successfully powers on and provides a change in altitude during flight, but the altitude values are not the expected values.

Has anyone had success with the US-D1 microwave sensor with Copter v3.6?

Dear Bowers,
Did you get that Problem solved?
I’m thinking of getting one and wondered if somebody got experience with it.