Worthington Sharpe website

Thursday 11 September 2014

The Wing for UAV Control

Things all got a bit more real on Monday when I took a trip down to Norwich to meet Elliot Corke of Hexcam. Hexcam operate UAVs (Uninhabited Aerial Vehicles, often called drones) for aerial photography and video work. I wanted to speak to them about using the Wing to operate the aircraft.



Some of our earlier engineering projects around a decade ago were on UAVs and the industry has moved on massively over the last few years. It is being approached from two sides: the hobby side of things, where there is still a lot of interest in piloting; and the industry side, where there is simply a job to be done and a UAV is the most practical solution for example in aerial mapping or search and rescue.

The level of autonomy has now reached a stage where it is extremely impressive. Take for example these flying robot rockstars. In many situations you can programme an aircraft to take off, complete its mission, then return and land, all by itself.

Our plan was to use the precision pointing of the mouse for the plotting and adjusting of the way points, and the 3D functions for manual aircraft control as required, or for camera gimbal control.

We already had the Wing working with the DJI and Ardupilot ground control software but we had only got as far as getting the sliders to move about in the calibration stage.

I had only really expected to open up discussions about the possibilities with Hexcam and have a look at how they operate but we managed a bit more than that; we plugged the Wing into the Hexcam laptop, calibrated it, and headed to their flight test site to see what would happen.

The Wing with Hexcam UAVs
The Wing with Hexcam UAVs


We had already used the Wing with the Heli X5 simulation software and so had some idea of how it would behave. Nonethless, we were delighted by how well the Wing performed in the field. With the standard twin-stick transmitter as a back-up Elliot took hold of the Wing and started flying. The throttle was mapped to the z-axis, which wasn't ideal but nevertheless, Elliot was soon more than comfortable with the Wing and was manoeuvring the aircraft adeptly. Elliot pilots UAVs for a living so he's certainly a lot more skilled than most for this sort of challenge, but he even let me have a go.

Elliot using the Wing to fly a quad copter
 Throttle control would be better handled via the scroll wheel, rather than the z-axis but we didn't manage to sort this out prior to the test. Thinking ahead to increased autonomy, using the scroll wheel to dial in a height is likely to be an intuitive means of controlling the altitude of the aircraft directly.

UAV control was one of the main drivers right from the start of the Wing project so this was a big milestone. We're now speaking to a few people to try and get a demo rig put together. We want to be able to use the Wing to simply point and click on the map in order to direct the aircraft, while manipulating the 3D capabilities of pitch, roll and yaw to control the camera. Exciting times lie ahead.

The day seemed surprisingly clear of technical problems until the way back. The train driver announced there would be a delay as one of the train doors wouldn't close. A short while later there came another announcement 'Don't be alarmed at the lights going out, we're going to try re-starting the train.'