Tagged: military

Using ADS-B Exchange to Track Police and Military Aircraft Monitoring the George Floyd Protests

During the recent George Floyd BLM protests police and military aircraft have been playing a large part in the surveillance of protestors. All these aircraft are required to transmit ADS-B which of course can be monitored with an RTL-SDR or other SDR. Many volunteers around the world use RTL-SDRs to upload ADS-B data to an online aggregation service, so flight data from all over the world can be accessed in one place. However, most ADS-B aggregation services like FlightAware and FlightRadar24 censor police and military aircraft from the raw ADS-B data received from the RTL-SDRs. ADS-B Exchange is the only service that has a policy to not censor any aircraft.

Buzzfeed recently ran an interesting article that used ADS-B Exchange to highlight the flight paths of various surveillance aircraft used during the protests, as well as the aircraft types used and who they are registered to. Most interestingly they saw that two military Black Hawk helicopters and a CBP Predator drone was used in Minnesota, and two military Lakota helicopters were using in Washington, DC.

As mentioned in a previous post, ADS-B Exchange recently updated their interface and backend, and they now run tar1090, which is a fully featured ADS-B mapping platform that can display the historical tracks of any tracked aircraft.

We also note that on Twitter John Wiseman @lemonodor also runs several "advisory circular bots" that make use of ADS-B Exchange data to automatically tweet a notification when aircraft are detected as having a circular flight path.

Police helicopter historical tracks over Minneapolis via adsb-exchange.com
Police helicopter historical tracks over Minneapolis via adsbexchange.com

Monitoring Military Aircraft with an RTL-SDR Part 2

Last month we posted about monitoring and logging military ADS-B data on milaircomms.com. It turns out that there is another service at www.live-military-mode-s.eu that also does military ADS-B logging. One user of live-military-mode-s.eu has recently uploaded a tutorial showing how to use a RTL-SDR to contribute to their logs. By contributing to their service you get a username and password to access members only sections of their site.

Contribution involves running an ADS-B decoder like RTL1090, sending the decoded data to Virtual Radar Server (VRS) and then using VRS to rebroadcast the data to their Mode-S Logger software.

Some Military ADS-B Logs
Some Military ADS-B Logs

Monitoring Military Aircraft with an RTL-SDR

The military air communications monitoring enthusiasts over at milaircomms.com have been using a system involving RTL-SDRs to monitor military air traffic through ADS-B. While military aircraft generally do not transmit GPS position information like commercial aircraft do, they are still able to record live information such as the aircraft’s hex code, registration number, aircraft type, the base station location and a graph of recorded altitudes. They also log all this data showing where military aircraft have been spotted over time.

To receive this information they so far have a network of about 30 volunteers running RTL-SDR based ground stations that use their custom MilAirComms1090 software. If you want to contribute, the software is available for Windows and for Linux/Raspberry Pi.

Example of a US Coast Guard C-130 Aircraft doing Touch/Goes and Sighting History
Example Logs of a US Coast Guard C-130 Aircraft doing Touch/Goes and its Sighting History

Listening to Brazilian Fleetsatcom Pirates with an RTL-SDR

Previously we posted about how it was possible to listen in on Mexican (or Brazilian?) military satellite radio pirates’ SSTV communications using an RTL-SDR. Now over on YouTube user legion elmelenas has uploaded a video showing some more Brazilian pirates using these military Fleetsatcom satellites for voice and data communications. To receive these signals he used a turnstile antenna.