Table 1: ANTENNA: Antenna characteristics
ANTENNA: Antenna characteristics

Name

Format

Units

Measure

Comments

Columns

Data

NAME

String

Antenna name

STATION

String

Station name

TYPE

String

Antenna type

MOUNT

String

Mount type: alt-az, equatorial, X-Y, orbiting, bizarre

POSITION

Double(3)

m

POSITION

Antenna X,Y,Z phase reference positions

OFFSET

Double(3)

m

POSITION

Axes offset of mount to FEED REFERENCE point

DISH_DIAMETER

Double

m

Diameter of dish

(ORBIT_ID) 

Int

Orbit id

(MEAN_ORBIT) 

Double96)

Mean Keplerian elements

( PHASE_ARRAY_ID) 

Int

Phased array id

ASSOC_ANTENNA_ID

Int

Associated antenna identifier

TIME

Double

s

EPOCH

Time of POSITION

Flag information

FLAG_ROW

Bool

The row flag

Notes: This sub-table contains the global antenna properties for each antenna in the MS. It is indexed directly from the ANTENNA_ARRAY collection in the CONFIG_DESCRIPTION  sub-table.n.
NAME
Antenna name  
STATION
Station name  
TYPE
Antenna type. The reserved keywords include GROUND-BASED1  for conventional antennas would be used in the case of ALMA, SPACE-BASED2 , TRACKING-STN3 .
MOUNT
Mount type of th antenna. Reserved keywords include EQUATORIAL4 hich would be used for ALMA, ALT-AZ5 , X-Y6 , SPACE-HALCA7 .
POSITION
In right handed frame. X towards the intersection of the equator and the Greenwich meridian, Z towards the pole. The exact frame should be specified in the MEASURE_REFERENCE keyword (IRTF or WGSS4). The reference point is the point on the az or ha axis closest to the el or dec axis.  
OFFSET
Axes offset of mount to feed reference point.  
DISH_DIAMETER
Nominal diameter of dish, as opposed to the effective diameter.
ORBIT_ID
Orbit identifier
MEAN-ORBIT
Mean Keplerian orbit elements, using the standard convention (Flatters 1998)
PHASE_ARRAY_ID
Phased array identifier. Points to a PHASED_ARRAY sub-table which points back to multiple entries in the ANTENNA sub-table and contains information on how they are combined.
FLAG_ROW
Boolean to indicate the validity of this entity. Set to True for an invalid row. This does not imply any flagging of the data in the MAIN  or PWVM , but is necessary as the ANTENNA index in CONFIG_DESCRIPTION  points directly into the ANTENNA sub-table. Thus FLAG_ROW can be used to delete an antenna entry without re-ordering the ANTENNA indices throughout the MS.
ASSOC_ANTENNA_ID
Associated antenna identifier. A value of -1 means no associated identifier. When an antenna position has been updated post-observations while it remained on the same station the antenna tuple corresponding to the ANTENNA_ID used during these observations must be updated to link to an associated ANTENNA_ID as soon as the new tuple with this updated position has been added in this sub-table. The ASSOC_ANTENNA_ID is the identifier of that new appended tuple.
TIME
Time when the position of the antenna has been determined.