MONITOR section

The MONITOR section describes all parameters associated with the data. MONITOR data are recorded independently from the backend data (DATA section). The interpolation of data associated parameters at the backend timestamps is written into the data substructure of the DATA section (see above).


Each frontend-backend combination has its own MONITOR section, i.e. MON1%HEADER and MON1%DATA for frontend-backend combination 1, MON2%HEADER and MON2%DATA for frontend-backend combination 2, etc.


Weather data and load temperatures are expected to be monitored several times per scan. For the time being, there is only one entry per imbFits file (except for HERA cold load temperatures).

MON1	S
MON1%HEADER	S
MON1%HEADER%DATE_OBS	C*23		observing date in TIMESYS
			system
MON1%HEADER%FOCOBS_X_Y_Z	3 D	mm	X,Y,Z focus correction
MON%HEADER%IAOBS_CAOBS_IEOBS	3 D	arcsec	Pointing corrections, to be added
			to IA (P1), CA (P2) and IE (P7).
			In old 30m control system terms:
			IAOBS = NULA,
			CAOBS = COL*,
			IEOBS = NULE
MON1%HEADER%OBSNUM	I		observation number
MON1%HEADER%SCANNUM	I		scan number

MON1%DATA	S
MON1%DATA%REFRACTIO	D	arcsec	refraction correction
MON1%DATA%THOTCOLD	$1 \times 2$ D	K	hot & cold load temperature
MON1%DATA%TAMB_P_HUMID	$1 \times 3$ D	C, hPa, %	ambient temperature,
			pressure and rel. humidity
MON1%DATA%ANTENNA_AZ_EL	2 D	deg	SAZM & SELV from old
			control system
MON1%DATA%LONGOFF	$n_{\rm slow}$ D	deg	long. offset from source in
			user native frame
MON1%DATA%LATOFF	$n_{\rm slow}$ D	deg	lat. offset from source in
			user native frame
MON1%DATA%BASLONG	$n_{\rm slow}$ D	deg	actual long. in astronomical
			basis frame, inc. wobbler
			offsets
MON1%DATA%BASLAT	$n_{\rm slow}$ D	deg	actual lat. in astronomical
			basis frame, inc. wobbler
			offsets
MON1%DATA%PARANGLE	$n_{\rm slow}$ D	deg	parallactic angle
MON%DATA%PHI_X_Y_Z	$n_{\rm subr} \times 3$ D	deg	Phi (subrefl. rotation) X, Y, Z
			(see MBFITS manual)
MON1%DATA%FOCUS_X_Y_Z	$n_{\rm subr} \times 4$ D		focus offsets and timestamp:
		mm	X subreflector position
		mm	Y subreflector position
		mm	Z subreflector position
		day	MJD timestamp in IMBF-
			subreflector binary table
MON1%DATA%DFOCUS_X_Y_Z	$n_{\rm subr} \times 3$ D	mm	focus (subreflector position)
			offsets X, Y, Z
MON1%DATA%TRACKING_AZ_EL	$n_{\rm fast} \times 2$ D	deg	antenna tracking errors in
			azimuth and elevation
MON1%DATA%ENCODER_AZ_EL	$n_{\rm fast} \times 3$ D		encoder azimuth & elevation
			and timestamp
		deg	encoder azimuth
		deg	encoder elevation
		day	MJD time of IMBF-antenna
			binary table (fast track)
MON1%DATA%MJD	$n_{\rm slow}$D	day	MJD time of IMBF-antenna
			binary table (slow track)

The MON structure only contains data that are used for interpolation. Daten taken e.g. between subsequent subscans, before scan start or after scan end do not have a SIC copy, except for the encoder values and tracking errors, written into structure ANTENNA. This structure is activated together with the MON structure (i.e. upon MIRA\VARIABLE mon), and contains (with $n_{\rm allFast} \ge n_{\rm fast}$):

ANTENNA%TRACKING_AZ_EL	$n_{\rm allFast} \times 2$ D	deg	antenna tracking errors in
			azimuth and elevation
ANTENNA%ENCODER_AZ_EL	$n_{\rm allFast} \times 3$ D		encoder azimuth & elevation
			and timestamp
		deg	encoder azimuth
		deg	encoder elevation
		day	MJD timestamp