Re: [Psrdada-developers] reading .dada file

[Andrew J. <aja...@sw...>]

Hi Vigneswaran,

The PSRDADA .dada format is essentially just a 4096 byte ascii header,
which you have shown below, followed by packed binary format that
your instrument produced. So if you were to skip past the first 4KB, you
should then have access to the raw data. PSRDADA does not make any
assumptions about the format of this binary data.

dspsr includes an unpacker that knows how to unpack many instrument
data formats (including PuMa2). If you know how the binary data is
packed then you should be able to write the code for your simulator that
can correctly unpack the data into the format that is convenient for you.

f you do not, then you might need to look at  the dspsr source code for the
 PuMa2 unpacker to determine how to interpret the binary data.

Cheers,

Andrew

On 19/10/2012, at 4:16 AM, Vigneswaran Karunanithi wrote:

Hi,

i have a .dada file and following is the contents of the header file
HEADER
DADA HDR_VERSION1.0
HDR_SIZE  4096
DADA_VERSION 1.0
PIC_VERSION1.0
OBS_ID 11206003
PRIMARY  unset
SECONDARY unset
FILE_NAME /data2/data/06Oct2012_LEAP
FILE_SIZE 800000000
FILE_NUMBER 0
UTC_START 2012-10-06-16:53:40
MJD_START  56206.7039351851851851852161050249
OBS_OFFSET 0
OBS_OVERLAP  0
SOURCE  B1855+09RA
18:57:36.39161
DEC+09:43:17.2322
TELESCOPE WSRT
INSTRUMENT  PuMa2
FREQ 1406
BW   20
TSAMP  0.025
NBIT 8
NDIM 1
NPOL 2
IN_USE 1
BYTES_PER_SECOND 80000000

I want to read the raw data without using dspsr as i would like to read the raw data into my simulator.
can someone help with the format of the .dada file.

Regards

--
____________________
Vigneswaran Karunanithi,
EEMCS TU Delft,
Zuid-Holland,
Netherlands,
Ph: +310623584766
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Andrew Jameson
Systems & Software Engineer
Centre for Astrophysics & Supercomputing
Swinburne University of Technology
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