[evla-sw-discuss] EVLA WIDAR: Delay Model - format and content

[Sonja Vrcic]

At the WIDAR correlator software meeting today we came to conclusion 
that, in order to save some CMIB CPU time,
time&day in the delay models (and other real-time requests) should be 
specified in the format used by the correlator.
If that is the case, the conversion into the format used by the 
correlator would be performed by the originator and not by the CMIBs.

The correlator receives time from external source, the format of the 
message is defined in the Programmer's Guide to the EVLA Correlator 
System Timing, Synchronization, Data Products and Operation (DRAO 
document A25290), Section 4.3.4. 
http://www.drao-ofr.hia-iha.nrc-cnrc.gc.ca/science/widar/private/Software.html

Sonja

>
>> 3.  Timestamps.  We work internaly in a double precision MJD and 
>> fraction
>> system (LSB is about one microsecond).  Converting that to ISO 8601 
>> form is easy of course, but I rather suspect that you also will be 
>> working in some similar system internally, and it might save a few a 
>> little bother at both ends just to send that.
>>   
>
>
> Internally our time is in seconds since the "epoch" with a time 
> resolution of 10ms. These are internally carried in
> two unsigned integers (32 bits) as that works very nicely with the OS.
>
>>
>>