Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/~emuller/header_parms.txt Дата изменения: Wed Sep 15 00:31:35 2004 Дата индексирования: Mon Oct 1 22:49:01 2012 Кодировка:

Here is some WAPP FITS header parameter documentation.

DATA - this is the data in a variable length array. In non-polarization
mode it is the FFT of the auto correlation using FFTW_REDFT00 of the
fftw3 package. A vanvleck correction is done on the data. A windowing
function is not. In the case of polarization data, auto and cross
correlation functions are save as data.

OBJECT - source name string that is chosen by the user.

CRVAL1 - Hz, this is the sky frequency used for this polarization.
CDELT1 - Hz, Frequency interval, this is the bandwidth / number of lags
CRPIX1 - center pixel, always number of lags /2
CRVAL2 - deg requested source position. This can be either AZ or RA
depending on equinox. In scanning modes this is the commanded
center of the map.

CRVAL3 - deg either ZA or DEC depending on epoch.
EQUINOX - years, usually 2000 or 1950. If 0 then CRVAL2 and CRVAL3 are
azimuth and zenith angle.

CRVAL4 - indicates the polarization of this scan. In polarization
mode (stokes) this number is the
1 - AA
2 - BB
3 - AB
4 - BA
For auto correlations, depending on the receiver its:
Linear A -6
Linear B -5
Circular A -1
Circular B -2

CRVAL5 - hours since midnight from obsdate

DATE-OBS - date in the 2004-07-25 or yyyy-mm-dd format.

TSYS - K last computed Tsys this beam. If you never do a standard cal
this is 0.0. This is intended as a receiver health check.

BANDWID - Hz Overall Bandwidth of spectrum.

RESTFRQV - Hz Rest frequency at band center. This is the number you type
in the IFLO configuration screen.

CRVAL1V - m/s_orZ Requested Velocity this is the number chosen by the user
for either Z or velocity. The value here depends
upon CTYPE1V.

CDELT1V - m/s_orZ CRVAL1V / number of lags
CRPIX1V - pixel of center velocity channel always number of lags/2
CUNIT1V - string either "Z" or "m/s"
CTYPE1V - string velocity type chosen by user
SPECSYS - velocity frame chosen by user
MJD-OBS - day modified julian day at exposure start
LST - hours Local Mean Siderial Time at exposure start
EXPOSURE - seconds of integration.

ENC_AZIMUTH - deg Encoder Azimuth on sky (not feed) This is uninterpolated
engineering information.
ENC_ELEVATIO - deg .5 Encoder Elevation, engineering info.
ENC_ALTEL - deg Encoder Elevation of other Carriage House, engineering info

CROFF2 - hr RA J2000 offset to commanded center. These
offsets include encoder errors and reflect actual telescope
position of this beam as well as can be known at the starting
time of this scan.
CROFF3 - deg Dec J2000 offset to commanded center as above.

The following are for held enginnering/debug purposes:
OFFC1 rad offset c1, engineering info
OFFC2 rad offset c2, enginnering info
OFF_CS integer that defines coordinates offc1 and offc2
OFF_TIME s seconds from midnight ast that offc1 etc. are valid

RATE_C1 - rad/sec D13.5 rate of change of offset for engineering purposes
RATE_C2 - rad/sec D13.5 rate of change of offset for engineering.
RATE_CS - Coordinate system of rates
RATE_DUR - s How long has rate been applied
These rates are valid at the time specified by OFF_TIME and not
necessarily the time of the scan.

CUR_TOL seconds. computed great circle tolerance not interpolated.
Not interpolated. The needs to be fixed.

REQ_TOL - seconds requested tolerance selected by user.

All the following positions are interpolated and calculated from
the actual telescope position including encoder pointing corrections.


MODEL_OFFAZ - deg pointing model offset az uninterpolated
enginnering info. Includes beam offset user offset and pointing
model offset.
MODEL_OFFZA - deg pointing model offset za as above.

BEAM_OFFAZ - deg ALFA unrotated offset az. This is directly read from
the table /share/wappsrc/alfa_pointing.tcl
BEAM_OFFZA - deg ALFA unrotated offset za as above.

USER_OFFAZ - deg commanded pointing offset az selected by user.
These are low-level pointing corrections not included in position
calculations.
USER_OFFZA - deg user commanded pointing offset za as above.

RFEED_OFFAZ - deg rotated offset this beam az
RFEED_OFFZA - deg rotated offset this beam za
The above are offsets following the ellipse given the alfa
rotation angle. This changes with each beam.

PRFEED_OFFAZ - deg offset to center prfeed beam az
PRFEED_OFFZA - deg offset to center prfeed beam za
The above are offsets of this beam to the center when
this beam is centered. For the center beam, these are the
negative of RFEED_OFFXX. These are the same for all beams of
a scan.

BEAM_OFFRAJ deg total ra offset to this beam
BEAM_OFFDECJ deg total dec offset to this beam za
These are of offsets in raj/decj to the center beam.

CRVAL2A - hr true ra pointing this beam on sky
CRVAL3A - deg true dec pointing this beam on sky
Actual J2000 position on the sky.

CRVAL2B - deg true az pointing this beam on sky
CRVAL3B - deg true za pointing this beam on sky
Actual AZZA position on the sky.

CRVAL2C - hr Ra J2000 antenna pointing without receiver beam offset
CRVAL3C - deg Dec J2000 antenna pointing without receiver beam offset

CROFF2B - deg true az offset to commanded map center
CROFF3B - deg true za offset to commanded map center
Actual offsets in azza to commanded center.

CRVAL2G - deg true galactic l pointing this beam on sky
CRVAL3G - deg true galactic b pointing this beam on sky
Actual L/B IAU 1958 Gallactic coordinates converted from CRVAL[23]A.

ALFA_ANG - deg ALFA rotation angle

PARA_ANG - deg parallactic angle computed from CRVAL[23]A.

OBSMODE - name of pattern ONOFF CAL OFFON DRIFT ON OFF. This is a string
which is intended to name the overall type of observation collecting
groups of scans into one observation.

OBS_NAME - Name of lowest obs ON OFF CALON CALOFF DRIFT This is a string
which is intended to name the a group of scans in a set of integrations.
Generally these scans have the same thing going on, like the cal is on
or you are pointing at one thing or scanning in one direction.

BACKENDMODE - Backend Mode String chosen by user.

CALTYPE - type of cal chosen by user.
FRONTEND - this is the abbreviated receiver name.

PLAT_POWER - Last measured power from platform meter
CNTRL_POWER - Last measured power from control room meter
TOT_POWER - Scaled Power in zero-lag
TCAL[64] K Tcal MHz/K 0:freq0 1:tcal0, 2:freq1 3:tcal1 ...
The above is a list of 32 frequency/Cal pairs read from
the tcal information available at this time.

SYN1 - Hz platform synthesizer
SYNFRQ[4] - Hz control room synthesizers
PATTERN_SCAN - unique number for pattern YDDDnnnnn
SCAN_NUMBER - unique num for low-level observation YDDDnnnnn
PATTERN_NUMBER - sequential observation number of obs_scans
TOTAL_PATTERN - total number of pattern_numbers

ENC_TIME - msec I8 Time when enc_AZ and enc_ZA measured

LAGS_IN - number of Lags - same as bytes of data/4
WAPPMASK - which other wapps or alfas enabled. See web page description.
NTCAL - number of valid tcal pairs

PRFEED - ALFA feed centered on this scan
NIFS - number of ifs in this observation
IFVAL - which polarization, 0-1 or 0-3 for stokes
ATTN_COR - Correlator attenuator 0-15
UPPERSB - True if spectrum flipped
INPUT_ID - WAPP number 0-3 or 0-7 for ALFA
MASTER - 0 greg 1 carriage house

The rest of this stuff is all engineering/debug information:

ONSOURCE - if onsource at enc_time
BLANKING - Blanking turned on
LBWHYB - LBandWide Hybrid is in (for circular pol)
SHCL - true if receiver shutter closed
SBSHCL - true if Sband receiver shutter closed

RFNUM - platform position of the receiver selectror
CALRCVMUx - platform cal selector
ZMNORMAL - platform transfer switch to reverse channels, true normal
RFATTN[2] - platform attenuator position
IFNUM - platform if selector, 1/300 2/750, 3/1500, 4/10GHz1500, 5-thru
IFATTN[2] - platform IF attenuator positions
FIBER - true if platform fiber is chosen (most always the case)
AC2SW - platform ac power to various instruments and other stuff

PHBSIG - platform converter combiner signal ph adjust
HYBRID - platform converter combiner hybrid
PHBLO - platform convert combiner lo phase adjust

XFNORMAL - control room transfer switch true = deflt
NOISE - control room noise on
GAIN[2] - gain of control room amps
INPFRQ - control room input distributor position
MIXER[4] - control room mixer source switches
VLBAINP - control room vlba input switch position
AMPINP[4] - control room amplifier input source switches
EXTINP[4] - control room external input selector switches
SYNDEST[4] - control room synthesizer destinations
CALSRC - control room cal source bit
CAL - is cal bit turned on

VIS30MHZ - control room greg 1 ch 0
PWRMET - control room power meter input switch
BLANK430 - control room 430 blanking on