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Output Capacity
The second equation relates to output rate,
, capacity:

(2) 
The first term in the lefthand side is the number of boards, ,
required for the correlation (the full correlator comprises 32 boards).
Our current peak
1500kB/s.
An alternative way to think about the outputrate
limit is to remember that the minimum
for a configuration
using the whole correlator is now 1s; configurations that use no more than
onehalf or onequarter of the correlator can achieve minimum
of s and s respectively.
In the future, the PostCorrelator Integrator (PCI) will provide
as high as 96MB/s, providing minimum
for the whole correlator of s. However, if recirculation is being used,
the minimum integration time would be
s.
The low integration times, together with
the fine spectral resolution afforded by large ,
will provide the possibility to map considerably
wider fields of view through reduced bandwidth
and timesmearing effects in the uv plane.
Furthermore, besides increasing the
absolute output data rate, the PCI will also provide additional computational
capability prior to sending the correlated data to the receiving workstation,
which could be used, among other things, to FFT the data into frequencyspace
or to apply phasecorrections to obtain multiple fieldcenters in a single
correlation pass. This latter capability would appeal to people interested in
specific targets within the primary beams of the participating stations, but
who wouldn't necessarily want the volume of data (
) associated with being able to map the entire area on the sky
subtended by them.
Next: Recent Improvements
Up: Capabilities
Previous: Correlator Capacity
Bob Campbell
20030922