# How to precisely land a copter in a defined place? [closed]

Say, I have a flat square landing place for a copter, made of e.g. aluminium or plastic, with marks on it making a square, looking like this from the top:

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|                                   |
|   *                           *   |
|                                   |
|                                   |
|                                   |
|                  |                |
|                --+--              |
|                  |                |
|                                   |
|                                   |
|                                   |
|   *                           *   |
|                                   |
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The copter is smaller than the landing field, to land properly. Say, it has some sensors or can be manipulated by the computer that powers logic of the landing square. The square itself can have sensors too.

I want the copter to land as precisely as possible into the place marked by land signs.

What ways are possible to implement this functionality knowing that it's a DIY prototype where I have no access to secret technology, but only to that is available in online electronic components stores?

I think of these:

• Having a camera either on the drone or on the landing plate that finds the marks and calculates if these marks are in the right place or if the drone must move along X or Y axis. Looks as an overkill and will be hard to configure it for difficult conditions like raining, night, snow.
• Using laser transmitters and receivers.
• Some solution I am not aware of but which is still simple and efficient enough.

In what direction should I look to find a solution for this problem?

• What kind of accuracy do you want or need? What about mechanical guides? – FooTheBar Sep 12 '16 at 9:41
• I thought about mechanical guides too, yes, but I still need to put the drone more or less precisely so that the guides could be matched with it. As I see, it would make sense to have +/- 5cm, – Sergei Basharov Sep 12 '16 at 9:52
• What kind of computational ressources do you have on the copter? Do you have a fast uplink to it? – FooTheBar Sep 12 '16 at 10:17
• I think, I can have a powerful system on the ground that can be linked to a copter via a fast wireless channel. – Sergei Basharov Sep 12 '16 at 11:00
• I'd go for the camera. Do you really fly your done if it;s raining or snowing? – FooTheBar Sep 13 '16 at 8:32