Haystack Observatory Postprocessing System (HOPS)
The Haystack Observatory Postprocessing System is a software package designed
to manipulate data generated by a MkIII or MkIV VLBI correlator. It is written
in C for Unix computers, and emphasises quality-control aspects of data
processing. It sits between the correlator and an image-processing package,
and performs basic fringe-fitting, data editing, problem diagnosis, and
correlator support functions. Below are links to some documents which
contain details of the various HOPS programs.
- General Information
- Aedit, the main edit/display program of HOPS.
| Link: |
General Information |
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Picture: |
Psplot Command Example (39 kB) This is an array of time versus baseline, and represents an entire experiment. Each colored rectangle is a baseline/scan. The entire view surface is active, and the user can select, delete, filter and display data at will using the mouse.
Plot Command Example (18 kB) The color coding indicates the quality of the points. All aedit plots are active, in the sense that data can be interactively selected and deleted using the
cursor, and an arbitrary level of detailed information can be retrieved about any selected point using the cursor. This plot shows multiband delay versus
time, six plots per page. There are many possible axes and modes of plotting. |
- Fourfit, the fringe fitting program.
Link:
| General Information
Control File Example |
| Picture: |
Fringe Plot Example (31 kB) This is very similar to the output of the MkIII FRNGE program, but differs in some details. This level of information is considered essential for effective
quality control at a MkIII or MkIV correlator. These fringe plots are screen entities, but can also be printed out on a single sheet of paper. |
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Vhelp output
| Link: |
Sample Vhelp Output This shows the output of a HOPS utility called vhelp, an online help system for the package. This sample provides a snapshot of the capabilities of the package as of
February 1995. These capabilities are undergoing fairly rapid enhancement. |
- Future Plans for the HOPS system
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781.981.5407 
