It shows range as the crow flies, when closer than 1km but the data in the previous video wasn't close enough. When under 1km a bar appears on the left side increasing in size until the distance is 0 (full bar).
I could change it to show horizontal and vertical bars to give a better feeling of where the target is. At the moment a small bar (1km away) could mean it is over head 1km above or the same height but 1km away horizontally. Not great but ok for now.
I don't know yet if all targets are captured or how it will deal with targets where there's no position data, I might need to do some more processing of the messages (it's possibly I'm not capturing all the ones needed at the moment, it is still in pre-beta stage
). I have just programmed it to look at the PFLAA and PFLAU targets and work out the closes from the x,y,z distances. If it looks like it will work in the real word then I will have a closer look at the data being processed.
This was more a hobby/fun project for myself. It could be useful for small aircraft though where the PAW is stuffed in the back somewhere and there isn't much space for a display. You could basically put it on a watchstrap with the size and weight of it
This video show the display and what the icons mean.
This one shows the ESP8266 and screen inside the early case (minus the latest one with lipo, charger and power regulator at this point). Just two items and a power source needed.
Using this method it should be scalable up to a larger screen/radar using the later versions of the modules, the size and weight would be constrained on the screen and battery as the modules are so small.