[Hackrf-dev] Air relay ADS-B to BTLE via single HACKRF in realtime

[Jason Cooper]

On Sun, Jul 12, 2015 at 01:55:12AM +0800, Jiao Xianjun wrote:
> On Sun, Jul 12, 2015 at 1:40 AM, Jason Cooper <hackrf at lakedaemon.net> wrote:
> > On Sun, Jul 12, 2015 at 01:10:31AM +0800, Jiao Xianjun wrote:
> > > I write a experimental HACKRF firmware (introduction and download:
> > > http://sdr-x.github.io/abar ) to let your Phone/Pad "see" air ADS-B info
> > > via HACKRF:
> >
> > Do you intend to publish the source code?
> 
> I am planning. But not now. code is ugly. And not think clearly about risk
> of potential dangerous usage.

There are many programmers who enjoy assisting by cleaning up code that
does something cool.  ;-)

> > > Because ADS-B and BTLE packet are sparse and rate is low, that's
> > > why I can have them run in the single MCU of HACKRF and share
> > > transceiver&antenna in TDD style.
> > >
> > > (To lower risk, latitude and longitude accuracy has been degraded
> > > intentionally)
> >
> > Risk of what?  Overload MCU?
> >
> MCU is powerful enough to calculate full resolution. Risk of dangerous
> usage. After all plane's accurate location will be exposed.

Ah, I don't think you need to be concerned about that.  At least in the
US and Europe, this information is published already:

  http://www.radarbox24.com/  Is an example of one

The velocity of the plane in combination with the slow update rate of
ADS-B (once per second) makes using this information alone for targeting
very unlikely if not impossible.

Visual targeting is the most likely attack path.  In which case, any
number of websites or receivers can give notice that a particular plane
is approaching.  In other words, I don't think your code is changing the
existing threat model any.

Ultimately, it's up to you.  I hope you change your mind and release it.

Now, for some cool thoughts:  AIS for maritime tracking?  FIS-B for
"It's going to rain in 2 minutes at your location" kind of alerts?
TIS-B for planes without ADS-B, but picked up on ATC radar?

thx,

Jason.