name
(TTYPE) |
Dtype/val
(Tform) |
src |
stat |
description |
|
|
|
|
START EXTN HEADER. following keywords order is
required |
XTENSION |
'BINTABLE' |
bt |
|
|
BITPIX |
8 |
bt |
|
8 bit bytes |
NAXIS |
2 |
bt |
|
table is 2-D |
NAXIS1 |
360 |
bt |
|
row Len in bytes |
NAXIS2 |
int |
bt |
|
number of rows in table |
PCOUNT |
int |
bt |
|
number of bytes end of table to end of heap. |
GCOUNT |
1 |
bt |
|
data records contain a single table |
TFIELDS |
66 |
bt |
|
number of fields (columns) in the table |
|
|
|
|
end required keyword order.
start non-table keywords |
EXTNAME
|
'CIMAFITS'
|
|
|
CIMAFITS is the standard
Arecibo FITS-format
|
VERSION
|
1.10
|
|
|
CIMAFITS version number
|
VER_DATE
|
'2008-04-01'
|
|
|
Date when this CIMAFITS version
was installed
|
THEAP |
int |
btr |
|
offset in bytes from start of
main data table to start of
heap. |
OBSERVER
|
'observers name'
|
|
|
Observer's name
|
PROJID
|
'a2327 '
|
|
|
Project ID string
|
OBSID
|
'a2327 '
|
|
|
|
BACKEND
|
'WAPP '
|
|
|
Name of backend
|
STIME
|
20
|
|
|
[ns] Correlator sampling interval
|
TELESCOP
|
'ARECIBO 305m'
|
|
|
Telescope name
|
OBSGEO-X
|
2390486.9000
|
|
|
Lat=atan2(Z,sqrt(X*X+Y*Y))
|
OBSGEO-Y
|
-5564731.4400
|
|
|
Long=atan2(Y,X)
|
OBSGEO-Z
|
1994720.4500
|
|
|
From VLBI, courtesy T. Ghosh
|
STARTON
|
0
|
|
|
Start on 0, 1, or 10 sec tick
|
RADESYS
|
'FK5 '
|
|
|
Main coordinate system is always
FK5
|
EQUINOX
|
2000.0000
|
|
|
Main coordinate system is always
J2000
|
|
|
|
|
end non table keywords
start of table column definitions |
1 DATA |
PE(16384) |
sdf |
|
array descriptor pointing to floating point data (E) with a
maximum
number of elements of 16384. The field contains two 32 bit entries.
(nelements,byteoffsetStartofHelp) |
2 TDIM1
|
16A
|
|
|
Dimensions of data pointed to in
the heap
|
3 OBJECT |
16A |
sdf |
|
object name |
axis notes |
|
|
|
axis 1 frequency
axis 2 longitude(ra)
axis 3 latitude (dec)
axis 4 polarization
axis 5 time |
4 CRVAL1 |
double hz |
sdf |
|
data axis 1. frequency at reference pixel. |
5 CDELT1 |
double hz |
sdf |
|
frequency step at reference pixel. |
6 CRPIX1 |
double |
sdf |
|
reference pixel (count from 1) |
7 CRVAL2 |
double deg |
sdf |
|
longitude axis for data.
'RA','GLON','ELON' + wcs projection code |
8 CRVAL3 |
double deg |
sdf |
|
latitude axis for data:
'DEC','GLAT,'ELAT' + wcs projection code |
9 CRVAL4 |
double |
sdf |
?? |
polarization (stokes) value for data.
1,2,3,4 : I,Q,U,V stokes parameters
-1,-2,-3,-4:RR,LL,RL,LR correlation of circulars
-5,-6,-7,-8,: XX,YY,XY,YX correlation of linears.
is rr,xx spectra or correlation functions. Where do we specify that
the data is in the time rather than the freq domain for line work?? |
10 CRVAL5 |
double (hours) |
ao |
?? |
hours from OBSDATE.
Is this at start, end, or middle of integration?? or is it start of
scan? |
11 DATE-OBS
|
16A
|
sh
|
?? |
yyyy-mm-dd start of this obs (UT).
Is this start of scan or start of current integration?? |
12 TSYS |
double (K) |
sdf |
|
system temperature |
13 BANDWD |
double (Hz) |
sdf |
|
total bandwidth of back end. |
14 RESTFRQ |
double (Hz) |
sdfsh |
?? |
Rest frequency for CRVAL2 and CRVAL3
Is this at the reference freq pixel or the center of the rf band.
Needs to be at the reference pixel.. |
15 RESTFRQG
|
double (Hz)
|
|
|
Rest frequency for CRVAL2G and
CRVAL3G
|
16 SPECSYS
|
8A |
|
|
Velocity frame for CRVAL2 and CRVAL3
|
17 SPECSYSG |
8A
|
|
|
Velocity frame for CRVAL2G and
CRVAL3G
|
18 REQ_VEL
|
double |
|
|
Requested velocity or z in frame
SPECSYS
|
19 REQ_VEL_UNIT
|
8A
|
|
|
Specifies units of REQ_VEL:
either m/s or Z
|
20 REQ_VEL_TYPE
|
8A
|
|
|
Velocity type for REQ_VEL
|
21 MJD-OBS |
double |
ao |
?? |
julian date at exposure start.
Start of scan or rec.
Does it have the full time resolution (fraction of day)? |
22 LST |
double (hours) |
sdfsh |
|
local sidereal time at start of scan. |
23 EXPOSURE |
double (secs) |
sdf |
?? |
effective integration time.
Is this for the current integration or the entire scan ?? |
24 REQ_RA
|
double (deg)
|
|
|
Requested long (usually RA) in
REQ_RADESYS
|
25 REQ_DEC
|
double (deg) |
|
|
Requested lat (usually DEC) in
REQ_RADESYS
|
26 REQ_RADESYS
|
8A
|
|
|
Coordinate system used for
REQ_RA and REQ_DEC
|
27 REQ_EQUINOX
|
8A
|
|
|
Epoch of requested position
REQ_RA and REQ_DEC
|
28 REQ_RAJ
|
double (deg) |
|
|
Requested RA J2000 antenna
pointing
|
29 REQ_DECJ
|
double (deg) |
|
|
Requested Dec J2000 antenna
pointing
|
30 ENC_TIME
|
|
|
|
Time when encoders were read out
(UTC)
|
31 ENC_AZIMUTH |
double (deg) |
ao |
?? |
actual encoder az on sky (not feed)
Contains the model correction. |
32 ENC_ELEVATIO |
double (deg) |
ao |
|
actual encoder elevation.
Contains the model correction. |
33 ENC_ALTEL |
double (deg) |
ao |
|
elevation for alternate encoder (the one not being used for
observing). |
34 OFFC1
|
double (deg) |
ao |
?? |
Offset applied to crval2. If the rate is non zero and it is
the same
coordinate sys as the rate, then croff2 includes the rate times it's
duration. |
35 OFFC2
|
double (deg) |
ao |
?? |
Offset applied to crval3. see rate comment for croff2. |
36 OFF_TIME |
double secs |
ao |
|
This is the AST time stamp of the requested pointing
data(raJ,decj).
comes from st.x.pl.tm.secMid |
37 RATE_C1 |
double deg/sec |
ao |
?? |
rate for first coordinate. degrees/solarSecond.
Not necessarily an ra rate.. |
38 RATE_C2 |
double deg/sec |
ao |
?? |
rate for 2nd coordiante. degrees/solarSecond |
39 OFF_CS |
8A |
|
|
coord sys for offsets.J-j2000, B-1950,C |
40 RATE_CS |
8A |
ao |
|
rate coordinate system. Coding same as off_cs
above |
41 RATE_DUR |
double Solarsec |
ao |
|
how long rate has been applied (solar seconds). |
42 CUR_ERR
|
|
|
|
Actual great circle tracking
error
|
43 ALLOWED_ERR
|
double asecs |
ao |
|
The encoder pointing error that determines when
we are on
source and tracking. When the cur_tol is less than this value the
onsource
keyword becomes true. |
44 AZ_ERR
|
double asecs |
|
|
Azimuth tracking error
(actual-requested)
|
45 EL_ERR
|
double asecs |
|
|
Elevation tracking error
(actual-requested)
|
46 MODEL_OFFAZ
|
double degs |
ao |
|
pointing model offset az. this is the model + encoder
offsets+prf offsets |
47 MODEL_OFFZA
|
double degs |
ao |
|
pointing model offset za |
48 BEAM_OFFAZ |
double degs |
|
|
unrotated alfa beam offset az (great circle) |
49 BEAM_OFFZA |
double degs |
|
|
unrotated alfa beam offset za |
50 USER_OFFAZ
|
double degs |
|
|
user commanded pointing offset az (gc?) |
51 USER_OFFZA |
double degs |
|
|
user commanded pointing offset za |
52 RFEED_OFFAZ |
double degs |
|
|
rotated offset this beam az |
|
|
|
|
|
53 RFEED_OFFZA
|
double degs |
|
|
rotated offset this beam za |
54 PRFEED_OFFAZ
|
double degs |
|
|
offset to center prfeed beam az |
55 PRFEED_OFFZA
|
double degs |
|
|
offset to center prfeed beam za |
56 BEAM_OFFRAJ
|
double degs |
|
|
tot ra offset to this beam |
57 BEAM_OFFDECJ
|
double deg |
|
|
tot dec offset to this beam |
58 AZIMUTH
|
double deg |
|
|
True AZ pointing this beam on sky
|
59 ELEVATIO
|
double deg |
|
|
True EL pointing this beam on sky
|
60 CRVAL2G
|
double deg |
|
|
True galactic l pointing this beam on sky
|
61 CRVAL3G
|
double deg |
|
|
True galactic b pointing this beam on sky
|
62 OFF_RA
|
double deg |
|
|
True RA J2000 offset to commanded map center
|
63 OFF_DEC
|
double deg |
|
|
True DEC J2000 offset to commanded map center
|
64 OFF_AZ
|
double deg |
|
|
True AZ offset to commanded map center
|
65 OFF_ZA
|
double deg |
|
|
True ZA offset to commanded map center
|
66 ALFA_ANG
|
double deg |
|
|
ALFA rotation angle
|
67 PARA_ANG
|
double deg |
|
|
Parallactic angle
|
68 VEL_BARY
|
double "m/sec"
|
|
|
Projected barycentric velocity (incl. VEL_GEO)
|
69 VEL_GEO
|
double "m/sec"
|
|
|
Projected geocentric velocity
|
70 FRONTEND |
8A
|
|
|
ascii name for receiver used .
|
71 BACKENDMODE
|
24A
|
|
|
Backend mode description
|
72 CALTYPE
|
8A
|
|
|
Calibration type
|
73 OBSMODE |
8A
|
ao |
|
name of pattern:
ONOFF,CAL,OFFON,DRIFT,ON,OFF |
74 SCANTYPE
|
8A
|
|
|
Type of scan (as part of pattern - e.g. ON OFF)
|
75 PATERN_ID
|
INT*4
|
|
|
sequential observation number of obs_scan. Increments each
integration.
Count from 1 at start of scan. All records (rows) from the same
integration
will have the same obs_num.
In terminology above, this is the group number. |
76 SCAN_ID
|
INT*4
|
|
|
Unique number for scan YDDDnnnnn
|
77 SUBSCAN
|
INT*4
|
|
|
Sequential number of current subscan (dump)
|
78 TOT_SUBSCANS
|
INT*4
|
|
|
Total number of subscans (dumps)
in scan
|
79 LAGS_IN
|
INT*4
|
|
|
Number of lags - same as bytes
of data/4
|
80 BAD_DATA
|
INT*4
|
|
|
0->good data
<>0->problem (see COMMENT)
|
81 PLAT_POWER |
double (db) |
ao |
|
power read from upstairs IF power meter. Value includes 20db
pad before
meter. |
82 CNTRL_POWER |
double (db) |
ao |
|
power read from downstairs IF power meter. Value includes 10
db pad
before meter. |
83 SYN1 |
double Hz |
ao |
|
Frequency of first lo in Hz. |
84 SYNFRQ |
double[4] Hz |
ao |
|
Frequency of the 4 synthesizers that normally
mix the first
IF down to the 2nd IF. The order [0..3] maps to wapp1,2,3,4. |
85 TOT_POWER |
double
|
|
|
This is the value of the 0 lag
(which is the total power). It
is linear
in power. It is the ratio of the measured/optimum power. A value
of 1. has the input power level set for optimum statistics.
The value read does not match the mean of the spectra (in the 4th
digit). |
86 WAPPMASK
|
INT*4
|
|
|
tells which wapps are being used and the number of
acfs/spectra. |
87 NTCAL
|
INT*4
|
ao |
|
number of valid tcal pairs |
88 TCAL_FRQ
|
32*DOUBLE
|
|
|
Frequencies for Tcal-values in TCAL_VAL
|
89 TCAL_VAL
|
32*DOUBLE
|
|
|
cal-values for frequencies in
TCAL_FRQ
|
90 PRFEED
|
uchar
|
|
|
ALFA feed centered on this scan
|
91 NIFS |
uchar |
ao |
?? |
number of IFS in this observation. Is this for 1 wapp or for
all wapps
that are being used simultaneously? |
92 IFVAL |
uchar |
ao |
?? |
polarization in use: 0,1, stokes:0-3.
This is similar to crval4. It is important to have
if ifval 0 will always be the left rack (polA) and ifval 1 will
always be the right rack (polB)? this would aid in debugging problems
in
the iflo. |
93 INPUT_ID
|
uchar
|
|
|
WAPP number 0-3 or 0-7 for ALFA (7=copy of 6)
|
94 UPPERSB |
uchar |
ao |
?? |
true if spectrum flipped.
I think this is duplicating CDELTA1 |
95 ATTN_COR
|
uchar
|
|
|
Correlator attenuator: 0-15 dB
|
96 MASTER
|
uchar
|
|
|
0=Gregorian dome 1=Carriage house
|
97 ONSOURCE
|
uchar
|
|
|
True if on-source at ENC_TIME
|
98 BLANKING
|
uchar
|
|
|
Blanking turned on
|
99 LBWHYB
|
uchar
|
|
|
LBandWide Hybrid is in (for
circular pol)
|
100 SHCL
|
uchar |
|
|
True if receiver shutter closed
|
101 SBSHCL
|
uchar |
|
|
True if S-band receiver shutter
closed
|
102 RFNUM
|
uchar |
|
|
Platform position of the
receiver selector
|
103 CALRCVMUX
|
uchar |
|
|
Platform cal selector
|
104 ZMNORMAL
|
uchar |
|
|
Platform transfer switch to
reverse channels
|
105 RFATTN
|
2*uchar |
|
|
Platform attenuator positions
|
106 IFNUM
|
uchar |
|
|
Platform IF selector, 1/300
2/750, 3/1500, 4/10
|
107 IFATTN
|
2*uchar
|
|
|
Platform IF attenuator positions
|
108 FIBER
|
uchar |
|
|
True if platform fiber chosen
(usually true)
|
109 AC2SW
|
uchar |
|
|
Platform AC power to various
instruments etc
|
110 PHBSIG
|
uchar |
|
|
Platform converter combiner
signal ph adjust
|
111 HYBRID
|
uchar |
|
|
Platform converter
combiner hybrid
|
112 PHBLO
|
uchar |
|
|
Platform converter combiner LO
phase adjust
|
113 XFNORMAL
|
uchar |
|
|
Control room transfer switch
true = default
|
114 NOISE
|
uchar |
|
|
Control room noise on
|
115 AMPGAIN
|
2*uchar |
|
|
Gain of control room amplifiers
|
116 INPFRQ
|
uchar |
|
|
Control room input distributor
position
|
117 MIXER
|
4*uchar |
|
|
Control room mixer source
switches
|
118 VLBAINP
|
uchar |
|
|
Control room VLBA input switch
position
|
119 AMPINP
|
4*uchar |
|
|
Control room amplifier input
source switches
|
120 EXTINP
|
4*uchar |
|
|
Control room external input
selector switches
|
121 SYNDEST
|
4*uchar |
|
|
Control room synthesizer
destinations
|
122 CALSRC
|
uchar |
|
|
Control room cal source bit
|
123 CAL
|
uchar |
|
|
Is cal bit turned on
|
124 VIS30MHZ
|
uchar |
|
|
Control room greg 1 ch 0
|
125 PWRMET
|
uchar |
|
|
Control room power meter input
switch
|
126 BLANK430
|
uchar |
|
|
Control room 430 blanking on
|