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rechner-gruppe:dbbcspec:dbbcspec
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rechner-gruppe:dbbcspec:dbbcspec [2013/11/27 10:53] ubach |
rechner-gruppe:dbbcspec:dbbcspec [2013/12/05 09:57] (current) ubach [The general features of the VLBI equipment] |
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| * Modular realization for cascaded stack processing | * Modular realization for cascaded stack processing | ||
| - | More detail can be found at [[http://www.hat-lab.com/hatlab/products/dbbc|Hat-Lab]] | + | More details can be found at [[http://www.hat-lab.com/hatlab/products/dbbc|Hat-Lab]] |
| The data from the DBBC is send out in VSI format. A VSI cable connects the DBBC with a Mark5B recorder, which records the data on disk modules (diskpacks of 8 PATA or SATA hard disks) in Mark5B format. The Mark5B formatted data consists of two parts a header and the payload. The header is composed of 4 32 bit words and the body of the frame is composed of 2500 32 bit words. More details can be found in the Mark5B manual on page 15 and 16 [[http://www.haystack.edu/tech/vlbi/mark5/docs/Mark%205B%20users%20manual.pdf|Mark5B Manual]] | The data from the DBBC is send out in VSI format. A VSI cable connects the DBBC with a Mark5B recorder, which records the data on disk modules (diskpacks of 8 PATA or SATA hard disks) in Mark5B format. The Mark5B formatted data consists of two parts a header and the payload. The header is composed of 4 32 bit words and the body of the frame is composed of 2500 32 bit words. More details can be found in the Mark5B manual on page 15 and 16 [[http://www.haystack.edu/tech/vlbi/mark5/docs/Mark%205B%20users%20manual.pdf|Mark5B Manual]] | ||
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| ==== Software to access Mark5B data ==== | ==== Software to access Mark5B data ==== | ||
| + | Jan Wagner has written some tools to access Mark5B data from python. They all use the pylibMk5B.py module. {{:rechner-gruppe:dbbcspec:mark5b_tools.tar|}} | ||
| + | There is also a collection of different script that use the pylibMk5B.py, e.g. | ||
| + | * **time_check.py** read a m5b file and print the start and stop time | ||
| + | * **xcorr5b.py** Reads data from two files and cross correlates them | ||
| + | * **plot5b.py** plots cross correlation | ||
| + | * **extract_second5Bbytes.py** Extract some bytes from the beginning of a given second | ||
| + | * **extract_second5B.py** Extract some seconds from the beginning of a given second | ||
| + | |||
| + | Another, maybe the proper, way to access the data are the tools from the mark5access library {{:rechner-gruppe:dbbcspec:mark5access-1.4.5.tar.gz|}}. They are part of the DifX software correlator package, see [[http://cira.ivec.org/dokuwiki/doku.php/difx/documentation|DifX docu]] | ||
rechner-gruppe/dbbcspec/dbbcspec.1385546001.txt.gz ยท Last modified: 2013/11/27 10:53 by ubach
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