Table 1: CONFIG_DESCRIPTION table: configuration description
CONFIG_DESCRIPTION table: configuration description

Name

Format

Units

Measure

Comments

Columns

Key

PROCESSOR_ID

Int

Processor id.

Data description

ANTENNA_NUM

Int

Number of antenna in the collection

CORRBIN_NUM

Int(BASEBAND_NUM)

Number of correlator data bins Nbi for each baseband

BASEBAND_NUM

Int

Number of basebands Nbb in the collection

SUBBAND_NUM

Int(BASEBAND_NUM)

Number of SUBBAND Nsb for each baseband

Data

ANTENNA_ARRAY

Int(ANTENNA_NUM)

ANTENNA collection

DATA_DESCRIPTION_ARRAY

Int(*)

DATA_DESCRIPTION collection

CORRELATION_MODE

Int

Correlation mode

Flags

FLAG_ANTENNA

Bool(ANTENNA_NUM)

Antenna flag collection

Notes: This table defines the shape of the associated DATA cell in the DRAFT_MAIN  table and is indexed directly by CONFIG_DESCRIPTION_ID. The number of identifiers in the DATA_DESCRITION_ARRAY collection is sum 1Nbb(Nbi × Nsb). All the collections in this table are arrays of identifiers. The collections must be ordered to provide the order in which the data are organized in the data cell; and any identifier must appear only once in a collection).
PROCESSOR_ID
Processor identifier (> 0) providing a direct index into the PROCESSOR  sub-table row number. This identifier would allow to discrimate data which come from e.g. ACA or dedicated single-dish antenna in case these antennas are connected to a correlator of different design.
ANTENNA_NUM
Number of antenna in a collection. This collection may correspond to an entire array or to a sub-array.
CORRBIN_NUM
Number of correlator data bins Nbi for each baseband
BASEBAND_NUM
Number of basebands Nbb in the collection
SUBBAND_NUM
Number of SUBBAND Nsb for each baseband
ANTENNA_ARRAY
ANTENNA collection. It is an ordered collection of ANTENNA_ID  identifiers which defines the antenna (sub-)array and contribute to determine the form of the data-cell object. Let assume a sub-array of ANTENNA_NUM = 4 antennas with the identifiers ANTENNA_ID  3 7 70 and 30. The data-cell will contain successively the data for the pairs 3-7, 3-70, 3-30, 7-70, 7-30, 70-30, 3-3, 7-7, 70-70 and 30-30. As illustrated with this example the data-cell will contain first the cross-correlated data and then the auto-correlated data.
DATA_DESCRIPTION_ARRAY
DATA_DESCRIPTION collection of sorted DATA_DESCRIPTION_ID  identifiers which defines the ensemble of DATA_DESCRIPTION descriptions used by the correlator for the antenna (sub-)array. The order sets the sequence of data_descriptions to contribute to determine the form of the data-cell object. This collection defines a domain of integrity defined in a tri-dimensional space, the axes being the correlator bin axis, the sub-band axis and the baseband axis. The bin axis size may be greater than one, e.g. in case of observations using the frequency-switch mode. The order of these axes is fixed, the data exploring the first axis first.
CORRELATION_MODE
Correlation mode. 0 means no auto-correlation i.e. only cross-correlations, 1 means no cross-correlation i.e. only auto-correlations and 2 means both cross-correlations and auto-correlations. For ALMA valid values are 1 or 2.
FLAG_ANTENNA
Flag antenna collection with the same number of elements as for ANTENNA_ARRAY collection.
One element in this collection is True if the data cell in the DRAFT_MAIN  table has valid data for the corresponding antenna; does not imply flagging in DRAFT_MAIN  .