UHD device support for kalibrate GSM clock offset calculator

Non-UHD version of kalibrate (for use with USRP1):
http://ttsou.github.com/kalibrate-uhd/kal-v0.4.1.tar.bz2

Universal Hardware Driver (UHD):
http://ettus-apps.sourcerepo.com/redmine/ettus/projects/uhd/wiki

OpenBTS Clock Wiki:
http://gnuradio.org/redmine/projects/gnuradio/wiki/OpenBTSClocks

GitHub:
http://github.com/ttsou/kalibrate-uhd

Release Notes

*The USRP2 is clocked at 100MHz and does not output fractional sample rates.

*For USRP1, the original, non-UHD version of kalibrate is recommended.

Download

Clone with Git:
git clone git://github.com/ttsou/kalibrate-uhd.git
git clone http://github.com/ttsou/kalibrate-uhd.git

Tarball:
http://github.com/ttsou/kalibrate-uhd/tarball/master

GitHub:
http://github.com/ttsou/kalibrate-uhd

Build

./bootstrap
./configure
make

Examples

USRP2 with internal reference:

(uhd) [ttsou@fischer src]$ ./kal -f 1941.6e6
linux; GNU C++ version 4.4.4 20100630 (Red Hat 4.4.4-10); Boost_104100; UHD_20101116.195923.c5043c6

Current recv sock buff size: 50000000 bytes

Warning:
    The hardware does not support the requested RX sample rate:
    Target sample rate: 0.270833 MSps
    Actual sample rate: 0.271739 MSps

kal: Calculating clock frequency offset.
Using PCS-1900 channel 569 (1941.6MHz)
average         [min, max]      (range, stddev)
+ 22.221kHz     [21574, 22791]  (1217, 352.328674)
overruns: 0
not found: 0



USRP2 with external 10MHz reference - Agilent E4438C (OCXO):

(uhd) [ttsou@fischer src]$ ./kal -f 1941.6e6 -x
linux; GNU C++ version 4.4.4 20100630 (Red Hat 4.4.4-10); Boost_104100; UHD_20101116.195923.c5043c6

Current recv sock buff size: 50000000 bytes

Warning:
    The hardware does not support the requested RX sample rate:
    Target sample rate: 0.270833 MSps
    Actual sample rate: 0.271739 MSps

kal: Calculating clock frequency offset.
Using PCS-1900 channel 569 (1941.6MHz)
average         [min, max]      (range, stddev)
+  13Hz         [-32, 86]       (118, 34.811478)
overruns: 0
not found: 0