CALHOLOGRAPHY Holography results

Name

Format

Units

Measure

Comments

Columns

Key

CAL_DATA_ID

Int Calibration data identifier

CAL_REDUCTION_ID

Int Calibration reduction identifier

ANTENNA_ID

Int Antenna identifier

FEED_ID

Int Feed identifier

FREQUENCY_RANGE

Double(2) Hz FREQUENCY Frequency range used to determine the result

Data description

NUM_X

Int Number of X pixels Nx

NUM_Y

Int Number of Y pixels Ny

NUM_SCREW

Int Number of screws

Data

START_VALID_TIME

Double s EPOCH Start time of result validity period

END_VALID_TIME

Double s EPOCH End time of result validity period

REF_X

Double Reference pixel for X

VAL_X

Double rad X value at Reference pixel

INC_X

Double rad Step size in X

REF_Y

Double Reference pixel for Y

VAL_Y

Double rad Y value at Reference pixel

INC_Y

Double rad Step size in Y

FOCUS

Double(3) m POSITION fitted focus coordinates

AMPLITUDE

Float( Nx, Ny) amplitude distribution

PHASE

Float( Nx, Ny) phase distribution

CORR_PHASE

Float( Nx, Ny) phase distribution (corrected for focus/pointing offsets)

PATH_ERR

Float( Nx, Ny) half path error (along Z)

RAW_RMS

Float m rms path error (along Z)

WEIGHT_RMS

Float m weighted rms path error (along Z) (12 dB taper)

SCREW_NAME

( Nscrew) Identification of screws

SCREW_MOTION

Float( Nscrew) Prescribed screw motions

SCREW_MOTION_ERR

Float( Nscrew) Uncertainty of prescribed screw motions

PANEL_MODES

Int number panel modes fitted

FREQUENCY

Double Hz FREQUENCY frequency for which the measurement is valid

Notes: This table contains the result of measuring the antenna surface by holography
CAL_DATA_ID
Calibration data identifier
CAL_REDUCTION_ID
Calibration reduction identifier
ANTENNA_ID
Antenna identifier
FEED_ID
Reference to a line in the FEED table that, in conjunction with FREQUENCY_RANGE defines the relevant receiver band.
FREQUENCY_RANGE
Frequency range used to determine the result. Note that the list of spectral windows corresponding to this frequency range must correspond to a single receiver band, this band being known via RECEIVER_ID which is (are) in the data section of the FEED table.
START_VALID_TIME
Start time of result validity period
END_VALID_TIME
End time of result validity period
--NUMX
Number of X coordinate pixels across the beam map
NUM_Y
Number of Y coordinate pixels across the beam map
NUM_SCREW
Number of prescribed screws settings
REF_X
Reference pixel for X coordinate
VAL_X
X value at Reference pixel
INC_X
Step size between pixels in X coordinate
REF_Y
Reference pixel for Y coordinate
VAL_Y
Y value at Reference pixel
INC_Y
Step size between pixels in Y coordinate
FOCUS
fitted focus coordinates from phase distribution across the aperture
AMPLITUDE
amplitude distribution across the aperture
PHASE
phase distribution across the aperture
CORR_PHASE
phase distribution across the aperture, corrected for best fit focus an pointing offsets
PATH_ERR
half pathlength error distribution (along Z coordinate)
RAW_RMS
rms half pathlength error distribution (along Z coordinate), unweighted.
WEIGHT_RMS
rms half pathlength error distribution (along Z coordinate), weighted with standard 12dB-edge taper power pattern (parabolic distribution).
SCREW_NAME
Identification of screws
SCREW_MOTION
Prescribed screw motions
SCREW_MOTION_ERR
Uncertainty of prescribed screw motions
PANEL_MODES
The number of panel modes fitted: 3 = no panel deformation, 5 full deformation (in the case of five tuning screws).