.. _telemetry:

AO Telemetry
============

Telemetry is taken during the real-time loop, within rtc2.c. Data is
stored in succesively numbered Data_xxxx.fits files. The data is
mapped as follows.

The telemetry array within Data_xxxx.fits is 4097 columns each
of which is a vector with 1382 elements.The 1382-vector contains
the values of internal measurement and state variables at the
sample time associated with the column.

*Note*, the first data vector is
bogus (there for technical reasons having to do with the
data collector), and should be ignored. 

.. image:: telemetry_table_1.png


.. code-block::

    >>> file = os.path.join(home,'Dropbox/seeing','Data_0000.fits')
    >>> u = fits.readfits(file)
    >>> u.shape
    (4097, 1382)
    >>> sx = u[1:,0:144]
    >>> sy = u[1:,144:288]
    >>> tts = u[1:,288:(288+2)]
    >>> tweeter = u[1:,(288+2):(288+2+1024)]
    >>> woofer = u[1:,(288+2+1024):(288+2+1024+52)]
    >>> filter = u[1:,(288+2+1024+52):(288+2+1024+52+14)]
    >>> utt = u[1:,(288+2+1024+52+14):(288+2+1024+52+14+2)]