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At UAVenture we’ve been using the uLanding Lite from Aerotenna for a few months now as part of our crop spraying development work. The uLanding is a lightweight (60g), sealed radar based distance sensor with about 30m range and a fast 500Hz update rate making it ideal for low altitude terrain following and of course accurate autonomous landings.

Using a radar based distance sensor with a sealed case means that you will not be susceptible to bad distance readings caused by airborne mist from the spray system between the laser and the surface or, worse still, on the laser lenses.

The driver, written by Roman Bapst, has just been submitted to master on PX4‘s github repository and should make it into the next release. Please see the Developer Guide for how to use it.

Here’s a short video of one of our early crop following tests with the uLanding mounted on the Iris.