[ghost91]

The problem are the RTL2832U receivers. The sample rate is too low, 500ns resolution with 2MSample/s is not enough. For this reason I cannot recommend using the dvb-t sticks as ads-b receiver (the symbol rate is too high, compare nynquist theorem).

Multilateration has already be done for ADS-B on large scale, but with different receivers. There are receivers available[1] with nanosecond accuracy (and gps time synchronization).

GPS synchronization isn't needed, by choosing other flight paths to provide basic time synchronization between receivers.

[1]: <http://radarcape.com/>

[bigiain]

There seems to be "a trick"...

http://www.rtl-sdr.com/passive-radar-dual-coherent-channel-r...

(That's on my list of "things to experiment with one day...")

[9600]

Yep, that's been on my list for a while too! :o)

Btw, I just updated the blog post with a link to another post where I ran up a GSM network on a Pi 2 equipped with a UmTRX transceiver.

http://www.rs-online.com/designspark/electronics/eng/blog/ru...

Given that UmTRX is dual channel, has a GPS locked clock and is much higher performance is general, I'm thinking it might make for an excellent platform for experimenting with passive RADAR!

Andrew

[ghost91]

This hack is awesome, thank you for the link. So many new possibilities… And cheaper than other mim̶o̶ setups.