ALMA_CORRELATOR_MODE Processor mode information.

Name

Format

Units

Measure

Comments

Columns

Data description

NUM_AXES

Int Number Naxesof axes in the data object

Data

BASEBAND_INDEX

Int Baseband index

ACCUM_MODE

Int ms Accumulation mode

BASEBAND_CONFIG

Int Baseband configuration mode

BIN_MODE

Int Bin mode

QUANTIZATION

Bool Quantization correction

WINDOW_FUNCTION

String Window function

AXES_ORDER_ARRAY

Int( Naxes) Order of the axes in the data object

Notes: This sub-table contains information on the processor mode applicable to the current data record.
NUM_AXES
Number of axes Naxes in the binary data blocks
BASEBAND_INDEX
The baseband index (1-4) configured.
ACCUM_MODE
Processor accumulation mode. For the ALMA correlator it can be 1 or 16 ms which defines the correlator chip level accumulation duration.
BASEBAND_CONFIG
Baseband configuration mode (1-66) which defines the bandwidth, polarizations and oversampling.
BIN_MODE
Single Bin = 0. Multiple bins, subarray-based (e.g., nutating subreflector or frequency switch) = 1. Multiple bins, baseline based
QUANTIZATION
Boolean selection to perform quantization correction on the lag data
WINDOW_FUNCTION
An enumerated value representing the windowing function to use: Uniform, Hanning, Hamming, Bartlett, Blackman, Blackman-Harris, Welch.
AXES_ORDER_ARRAY
Axes order in the binary data blocks. The first element corresponds to the axis index varying the most rapidly. Each axis type is coded by an integer value: 1:Polarization, 2:Frequency channel, 3:Atmospheric pathlength correction, 4:Bin number, 5:Spectral window, 6:Baseband number, 7:Baseline cross-products first, 8:Baseline auto-products first. For ALMA AXES_ORDER_ARRAY is 1,2,3,4,5,6,7 and when there is only single-dish 1,2,3,4,5,6,8. For modes using neither the frequency switching mode, nor nutator switching mode, 4 may be droped from that list.