Output Rate

by Gustaaf Van Moorsel last modified Jun 05, 2013

Correlation parameters should result in an output rate less than 10 MBytes per second (of observing time) for routine DiFX processing; higher rates may be considered if required and adequately justified. Observers should ensure that their data-analysis facilities can handle the dataset volumes that will result from the correlation parameters they specify.

An approximate parametrization of the output rate is given by

[display]R = 4 \cdot \frac{N_{\rm stn} \cdot (N_{\rm stn}+1) \cdot N_{\rm sbb} \cdot N_{\rm spc}}{T_{\rm int}}\cdot N_{\rm phc} \cdot p[/display]

where the rate [inline]R[/inline] is in Byte/s;

[inline] N_{\rm stn} , \; N_{\rm sbb} , \; N_{\rm spc} [/inline] are the numbers of observing stations, data channels, and spectral points per data channel, respectively;

[inline]T_{\rm int}[/inline] is the correlator integration period;   and

[inline]N_{\rm phc}[/inline] is the number of phase centers.

The polarization factor [inline]p=1[/inline] for single-polar, or dual-polar parallel-hand output;  or [inline]p=2[/inline] for cross-polar, four-Stokes processing.

Output data rates are also estimated by SCHED.