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

[Sonja Vrcic]

Attached to this e-mail are the XML Schema for delay models and an XML 
document that contains example of delay models for the WIDAR correlator. 
A shorter version of the XML document is shown below.

An example was created by hand to illustrate the format, content and 
size of the message.
Each model in the example specifies two derivatives (coefficients);  
user may choose to specify more (or less).

In the WIDAR correlator, one Station Board can have up to two basebands, 
each baseband can have up to 18 subbands. When subband delay tracking is 
required, user may specify up to 38 (2 + 36) delay models per board.   
All delay models for the same Station Board that have the same epoch may 
be grouped in one XML element (and transmitted in a single message).

<!--
     An example of the proposed  Delay Model for the  WIDAR correlator.
     Delay models for the Station Board 2-0-4 which has two basebands; 
one subband for each baseband.
-->
<vciDelayModel xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"     
xsi:noNamespaceSchemaLocation="vciDelayModel.xsd" 
timeStamp="2008-12-17T09:30:46" >
    <vciStbDelayModel epoch="2008-12-17T09:30:47.000" >
        <boardId rack="2" crate="0" slot="4" />
        <bbDelayModel numDeriv="2" 
bbId="0">0123456789abcdef0123456789abcdef</bbDelayModel>
        <bbDelayModel numDeriv="2" 
bbId="1">0123456789abcdef0123456789abcdef</bbDelayModel>
        <sbDelayModel numDeriv="2" bbId="0" 
sbId="0">0123456789abcdef0123456789abcdef</sbDelayModel>
        <sbDelayModel numDeriv="2" bbId="1" 
sbId="0">0123456789abcdef0123456789abcdef</sbDelayModel>
    </vciStbDelayModel>
</vciDelayModel>

Question: In order to make the message shorter, it would be nice to avoid repetition and specify the number od derivatives (numDeriv) per board (in the same way as epoch). May I assume that, most of the time, the number of derivatives (coefficients of the polynomial) will be the same for all the basebands and subbands on a Station Board. When that is not the case, user would have to generate more than one element vciStbDelayModel per board.

All comments and suggestions will be appreciated,
Sonja 


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