Local positioning system

Question

Do it yourself

There was an idea to make 4-8 transmitters, place them in a 2x2km square and try to determine the position inside it. Tell me what is it called? Or what to read before you start spending money on parts?

Answer 1

DGPS would be fine for you , but DGPS stations only have coverage along the coasts of some countries.
Alternatively, you can simply watch the GPS signals for a few minutes, and then calculate the statistics and calculate the most probable coordinates. Surveyors in this way manage to track movements of 2-3 mm per year .
In general, for a scale of 2 × 2 km, nothing more accurate than GPS has yet been invented. If you can achieve greater accuracy with a makeshift system, you will become very rich. But it won't be easy :)

Answer 2

Do you want to develop a complete system from scratch or use ready-made blocks and solutions?
If the second, then a lot of unsubscribed from above.
The first option has many solutions, I would focus on the analysis of the phase shift of the signal.
At the same time, depending on the number of objects to be monitored (I dare to assume that you are probably going to track cats?), You can offer a reverse scheme - with stationary receivers and a mobile transmitter.
Perhaps if you describe the problem in more detail, you will be able to recommend more specific solutions.

Answer 3

5 km radius is needed for a 2x2km square.
What is the nature of the terrain: steppe How
often do you need to determine the location? More than 1 second.
Target movement speed: maximum/average? 2-10km/h

Answer 4

hmm... mine?
2km is too far for ultrasound, optics are not universal, and for radio waves, get tired of paying for frequency allocation.
And something tells me that equipment capable of detecting discrepancies with such accuracy (do you need better GPS / GLONAS?), working with your 'towers', will cost a pretty penny.

Answer 5

I heard about a problem with similar initial conditions, it sounded like "measuring the daily run of a cow." Very similar. I immediately asked - how will you receive the coordinates - there was no answer. How to identify cows is clear, but how to track movements ...
There used to be articles about tracking the movements of players on the football field and collecting statistics. Can you take photos from the tower? Razorishsya truth, every second to take a picture. And the height of the tower to cover such a square should be decent.
They said something else about the pedometer (but this is about the task that I am talking about, and not about yours)

Answer 6

Why don't you want a GPS + transmitter that transmits corrections? With this approach, you can get an accuracy of 1-2 cm and a fairly high update rate (I don’t remember the exact figure, but it seems to be more than 100Hz). Our people determined the position of the trucks during the tests, they got 1-2 cm of accuracy.

Answer 7

IMHO it is worth looking in the search engines for "Sports radio direction finding, orienteering."
I won’t say anything about positioning accuracy, but it fits your description.