DISPERSIVE_DELAY Dispersive delay information.

Name

Format

Units

Measure

Comments

Columns

Key

ANTENNA_ID

Int Antenna identifier

FEED_ID

Int Feed identifier

SPECTRAL_WINDOW_ID

Int Spectral window identifier

TIME

Double s EPOCH Time interval mid-point

INTERVAL

Double s Time interval

Data

TIME_ORIGIN

Double EPOCH Origin for the polynomial

NUM_POLY

Int Series order Npoly

PHASE_DELAY

Double(( Npoly+1)) rad Phase delay polynomial

GROUP_DELAY

Double(( Npoly+1)) s Group delay polynomial

DISP_DELAY

Double(( Npoly+1)) s Dispersive delay at 1m wavelength

Notes: This table contains time-variable delays applied for each feed on each antenna, for each spectral window.
ANTENNA_ID
Antenna identifier, as indexed from an element in the ANTENNA_ARRAY collection
FEED_ID
Feed identifier
SPECTRAL_WINDOW_ID
Spectral window identifier
TIME
Mid-point of time interval for which these delay parameters in the row are valid. The same reference used fir the TIME column in the MAIN must be used.
INTERVAL
Time interval.
TIME_ORIGIN
Time origin
NUM_POLY
Series order for the phase and group delays
PHASE_DELAY
Phase delay polynomial
GROUP_DELAY
Group delay polynomial
DISP_DELAY
Dispersive delay at 1m wavelength. Total term including the geometric delay, delays caused the troposphere (wet and dry components) and the ionosphere, the instrumental delays