Session Notes for RD0804
Prepared by D. Behrend, NVI, Inc./GSFC
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PURPOSE AND GENERAL NOTES
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The purpose of rd0804 is to test 512 Mbps recording mode
for possible usage in CONT08. NOTE: this schedule uses
the 512 Mbps frequency setting with 32 tracks (and not
64 tracks that was used in the 512 tests before rd0803).
This frequency setup uses 2-bit sampling with no fanout.
The schedule was generated using SNRs of 20 at X-band and
15 at S-band for all stations. Ny-Alesund will observe
with warm receiver; the SEFD values are tripled for X
(2700) and doubled for S (2400) with respect to Ny
having a cold receiver. All stations have been fully
scheduled.
Westford was tagged along in case they become available
for observing.
The schedule uses a selection of 98 sources. 25 of them
were taken from the catalog of good geodetic sources;
73 are "new" sources to be tested for adding to the
geodetic source catalog.
Wettzell will observe INT I08142 and join rd0804 at about
1950 UT.
An extra 3 seconds is added at the start of each scan for
correlator synchronization. These extra seconds are not
included in the calculation of the scan SNR.
This session must be recorded on Mk5 disks. Multiple disk
modules may be required. Stations must plan for disk changes
by referring to the drudg listings that display the number of
Gb recorded during the experiment.
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Parameter values for experiment RD0804
Experiment description: R&D-04 2008
Scheduler: dbb Correlator: HAYSTACK
Nominal start: 2008-142-18:00:00 Nominal end: 2008-143-18:00:00
Current yyyyddd: 2008142 (2008.39) ( 14608 MJD, WED. 21MAY.)
Greenwich sidereal time: 9:58:58.00 (18: 0: 0 UT)
Sun's RA and DEC: 3h 55.6m 20d 21.9
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First observations
Observation listing from file ./rd0804.skd for experiment RD0804
Source Start DURATIONS
name yyddd-hhmmss Ny Sv Ts Wf Wz
1144+402 08142-180000| 20 20 20 |
1606+106 08142-180239| 20 20 20 |
......
0059+581 08142-181651| 20 20 20 20 |
......
1156+295 08142-195054| 24 20 24|
OJ287 08142-195306| 20 20 20 20|
End of listing.
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Last observations
Observation listing from file ./rd0804.skd for experiment RD0804
Source Start DURATIONS
name yyddd-hhmmss Ny Sv Ts Wf Wz
......
0528+134 08143-174933| 20 20 20|
......
1617+229 08143-175544| 94 45 31 94|
1754+155 08143-175807| 70 70 43 |
End of listing.
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SKED Summary from file ./rd0804.skd for experiment RD0804
(all scans with at least one subnet station)
Average number of obs. per baseline per source(normalized by up-time) = 7.3
Min = .0 Max = 68.6 (Baseline Ny-Ts on 0458-020) RMS = 7.2
Total time: 1439 minutes ( 24.0 hours).
Key: Ny=NYALES20 Sv=SVETLOE Ts=TSUKUB32 Wf=WESTFORD Wz=WETTZELL
Ny Sv Ts Wf Wz Avg
% obs. time: 36 22 14 10 32 23
% cal. time: 7 7 5 2 6 5
% slew time: 20 65 14 8 10 24
% idle time: 37 6 66 80 51 48
total # scans: 573 594 394 169 504 446
# scans/hour : 24 25 16 7 21 19
Avg scan (sec): 54 31 31 51 55 43
# data tracks: 32 32 32 32 32
# Mk5 tracks: 32 32 32 32 32
Total GBytes: 2216 1345 881 620 1994 1411
Total GB(M5): 1970 1196 783 551 1773 1254
# of tapes : .1 .1 .1 .1 .1
tape change times (hhmm):
Total number of tapes: .7 Total GBytes (M5) recorded: 6272.2
# OF OBSERVATIONS BY BASELINE
| Ny Sv Ts Wf Wz StnTotal
-----------------------------------
Ny| 556 370 166 464 1556
Sv| 374 162 487 1579
Ts| 75 284 1103
Wf| 159 562
Wz| 1394
Number of 2-station scans: 26
Number of 3-station scans: 233
Number of 4-station scans: 297
Number of 5-station scans: 59
Total # of scans, observations: 615 3097
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Recording mode
Name Code
GEOSX8N 8F
Recording mode setup for:
NYALES20 SVETLOE TSUKUB32 WESTFORD WETTZELL
Mode Tot.Rate Tot.BandW #chan #bits Barrel
Mk341:1 506.368 Mbits 253.184 MHz 14 2 NONE
Chan.BW #Subpasses Tracks(*fan) Tot.tracks Speed
8.00 MHz 1 32(*1) 32 .02
X-band spanned bw= 720.0 MHz rms spanned bw= 280.4 MHz
S-band spanned bw= 140.0 MHz rms spanned bw= 50.9 MHz
Effective number of channels recorded per sub-pass
X S Total
19.780 11.868 31.648
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Tape types
ID Station Tape length Density Passes
Ny NYALES20 Mark5A
Sv SVETLOE Mark5A
Ts TSUKUB32 Mark5A
Wf WESTFORD Mark5A
Wz WETTZELL Mark5A
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SNR Targets
Minimum SNR by baseline for multi-baseline scans
X-band (margin 5) S-band (margin 3)
Ny Sv Ts Wf Ny Sv Ts Wf
Sv 20 Sv 15
Ts 20 20 Ts 15 15
Wf 20 20 20 Wf 15 15 15
Wz 20 20 20 20 Wz 15 15 15 15
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DISK MODULE CHANGES
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This session will require 1 or 2 disk modules, depending on the sizes
that you have available at your station. DRUDG does not know the
sizes, so it shows an ever-increasing GByte count. Please be aware
that you may have to change modules during this session, and plan
accordingly.
There are a few of things to consider:
1) It is desriable to precondition all modules ahead of time that you
will use for the session. Recording often works better if the modules
have been preconditioned since their last shipment. If you don't have
time to precondition all the modules that are needed, plus one or two
spares, please precondition as many as you can.
2) Mark module change times. Select the modules you will use for this
session, note their sizes, and then mark by hand the places in the
schedule where a module change will be necessary, and which bank
will need to be changed. You can use the drudg Option 5 listing
for this purpose. Unfortunately it is not possible to predict the
module change times exactly. For various reasons, a module can be
finished at a different time, usually earlier than expected. As long
as a module does not end a great deal earlier than expected, this
should not cause a problem.
3) Change modules promptly. When a module is full, the FS will
automatically switch to the next one and put up a notice that you
should change the old one. It is good practice to change the module
as soon as possible after it is called for, because then a new one
is available in case the module in use should end prematurely for
some reason.
If you have any questions, please contact Ed Himwich
(Ed.Himwich@nasa.gov).