4 ms·
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
by ghost91 11y ago
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/> http://radarcape.com/>
- bigiain 11y agoThere seems to be "a trick"... http://www.rtl-sdr.com/passive-radar-dual-coherent-channel-rtl-sdr/ http://www.rtl-sdr.com/passive-radar-dual-coherent-channel-r... (That's on my list of "things to experiment with one day...")
- ghost91 11y agoThis hack is awesome, thank you for the link. So many new possibilities… And cheaper than other mim̶o̶ setups.
- 9600 11y agoYep, 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/running-a-gsm-network-on-the-raspberry-pi-2 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