diff options
Diffstat (limited to 'host/docs/calibration.rst')
| -rw-r--r-- | host/docs/calibration.rst | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/host/docs/calibration.rst b/host/docs/calibration.rst new file mode 100644 index 000000000..26a1064c9 --- /dev/null +++ b/host/docs/calibration.rst @@ -0,0 +1,55 @@ +======================================================================== +UHD - Calibration Application Notes +======================================================================== + +.. contents:: Table of Contents + +------------------------------------------------------------------------ +Self-calibration +------------------------------------------------------------------------ +The UHD comes with several self-calibration utilities for minimizing IQ imbalance and DC offset. +These utilities perform calibration sweeps using transmit leakage into the receive path +(special equipment is not required). +The results from a calibration are written to a csv file in the user's home directory. +UHD will automatically apply corrections at runtime when the user changes settings. +Calibration results are specific to an individual RF board. + +UHD comes with the following calibration utilities: + + * **uhd_cal_rx_iq_balance:** - mimimizes RX IQ imbalance vs LO frequency + * **uhd_cal_tx_dc_offset:** - mimimizes TX DC offset vs LO frequency + * **uhd_cal_tx_iq_balance:** - mimimizes TX IQ imbalance vs LO frequency + + +The following RF frontends are supported by the self-calibration utilities: + + * WBX transceiver board + * SBX transceiver board + * more to come... + +******************************************** +Basic tool usage +******************************************** + +UHD installs the calibration utilities into <install-path>/bin. +Run the following from the command line: +:: + + uhd_cal_rx_iq_balance --verbose --args=<optional device args> + uhd_cal_tx_iq_balance --verbose --args=<optional device args> + uhd_cal_tx_dc_offset --verbose --args=<optional device args> + +See the output given by --help for more advanced options, such as: +manually choosing the frequency range and step size for the sweeps. + +******************************************** +Calibration files +******************************************** +Calibration files are stored in the user's home/application directory. +They can easily be moved from machine to another by copying the "cal" directory. +Re-running a calibration utility will replace the existing calibration file. +The old calibration file will be renamed so it may be recovered by the user. + + * **Unix:** ${HOME}/.uhd/cal + * **Windows:** %APPDATA%\.uhd\cal + |