[Hackrf-dev] HackRF support for Kalibrate.

[Sebastian Muniz]

Awesome. Thanks!

On Sunday, April 27, 2014, 王康 <scateu at gmail.com> wrote:


> Hi guys,

>

> I just added hackrf support for kalibrate.

>

> You can find it on :

>

>     https://github.com/scateu/kalibrate-hackrf

>

> Kalibrate is a Linux program that uses GSM mobile cell phone base

> stations to determine the PPM offset, by using the GSM signals own

> frequency correction bursts(FCCH).

>

> I think the code is working now, and any report or fix will be very

> welcomed.

>

> $ ./kal -s GSM900

>     hackrf_set_freq: 939400000

>             chan: 22 (939.4MHz + 325Hz)     power: 474916.50

>     hackrf_set_freq: 939600000

>     hackrf_set_freq: 939800000

>     hackrf_set_freq: 940000000

>     hackrf_set_freq: 940200000

>     hackrf_set_freq: 940400000

>             chan: 27 (940.4MHz + 325Hz)     power: 503685.38

>     hackrf_set_freq: 940600000

>     hackrf_set_freq: 940800000

>     hackrf_set_freq: 941000000

>     hackrf_set_freq: 941200000

>     hackrf_set_freq: 941400000

>             chan: 32 (941.4MHz + 378Hz)     power: 450694.89

>     hackrf_set_freq: 941600000

>             chan: 33 (941.6MHz + 363Hz)     power: 450264.92

>     hackrf_set_freq: 941800000

>     hackrf_set_freq: 942000000

>

> $ ./kal -c 32 -D

>     debug: fcch_detector finished -----------------------------

>     debug: error limit: 0.5

>     debug: 146      272.215363      68025.585938

>     [.......]

>     debug: fcch_detector finished -----------------------------

>     debug: error limit: 0.5

>     debug: 144      290.700104      68040.851562

>     debug: fcch_detector finished -----------------------------

>     average         [min, max]      (range, stddev)

>     + 326Hz         [291, 363]      (72, 19.584045)

>     overruns: 0

>     not found: 3

>     average absolute error: -0.347 ppm

>

>

> For now ,the code is quite dirty, I will make it clean later.

>

> BTW:

> I think we need some API function like:

>

>     hackrf_read_sync(device, buf, sizeof(buf), &n_read)

>

> Now I have to use hackrf_start_rx() with a callback function.

>

>

>

> ------------------------

> Cheers,

> scateu.

> http://hackrf.net :  A Chinese HackRF Community.

> _______________________________________________

> HackRF-dev mailing list

> HackRF-dev at greatscottgadgets.com <javascript:;>

> http://nine.pairlist.net/mailman/listinfo/hackrf-dev

>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://nine.pairlist.net/pipermail/hackrf-dev/attachments/20140427/1fac5448/attachment.html