LEDzep – Distance measurement model based on RSSI


We did our first team presentation on monday showing our PSSC. We spent our entire sunday preparing it and we devided then our tasks. I’m in charge of positioning system. I presented to you a solution with IR technology. It seems to be now a little bit to difficult and unreliable (video processing especialy).

It seems to be better to use the received ble signal to deduce distances. In fact I’ve read at least four articles showing how to use Received Signal Strength Indication (RSSI) of BLE in order to deduce distances. I’ve found also a system that seems to work (but not very precise). It’s made by Apple but it can be use on Android devices. It’s called Ibeacon and Apple said that they are a real good solution for indoor localisation. But many users on youtube shows that the system is not so many precise if the user keeps its phone on his pocket. But could it be a solution for our Ballon?

We can imagine to use something like Ibeacon (Drops could be helpfull dear Drops&Roses 😉 ) in our test rooms. We will then analyse RSSI signals and find our relative position. The formula that we should use here is: “RSSI[dbm] = −(10.n log10(dist) − A)”.  Where A is a particular constant calculated when we receiver is 1 meter away. If we choose this solution, we could also use smartphones as transmitters. And this seems to be very interesting. For example, we would be able to ask ballons to follow the App user…

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