I need to locate my multicopter in case of crash, and for this I was thinking of creating an emitter low frequency radio (27, 35, 50 MHz) and then capture the strength of the signal to determine the place in which is located the source.
Can i do such a thing? Give me some advice on the hardware to use?
I am directed at low frequencies for distances that can be covered, while the precise value of the frequency I was inspired by a post I found on a modelistic forum:
[...] Common radio frequencies in use by modellers 27MHz, 35MHz, 50MHz, 900MHz, 1.2GHz, 2.4GHz, 5.8GHz [...]
Adding a GPS is your best option.
Low frequency radio is very poor for location finding, as getting accurate direction is difficult.
Above 400 MHZ it gets a little better as the wavelengths get smaller.
mauried:
Adding a GPS is your best option.
Low frequency radio is very poor for location finding, as getting accurate direction is difficult.
Above 400 MHZ it gets a little better as the wavelengths get smaller.
The signal at 400 MHz can be detected at 200-300m or higher (with probable obstacles in between, such as trees or walls)?
TomGeorge:
Hi,
If you already have a GPS on board, then use it.
If you crash it won't be needed to keep the machine in the air.
Tom....
Yes, but how transmit GPS coordinates to any display? I've already think to use xbee, but is a little expensive and there isn't fun in this manner
I have done direction finding in the 144MHz ham radio bands. You can do it a lower frequencies using a coil as an antenna. This was done during world war 2.
The problem is that on the ground the range is way shorter than when it is in the air. The best bet is to use GPS. If you don't know how to do this then describe how your system is wired and see if we can come up with a soloution.
