[IGSMAIL-3514]: SVN 19 anomaly test details (fwd)
Jim Ray (USNO 202-762-1444)
jimr at maia.usno.navy.mil
Fri Sep 7 13:41:01 PDT 2001
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IGS Electronic Mail 07 Sep 13:41:04 PDT 2001 Message Number 3514
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Author: Frank Lorge (forwarded by Jim Ray via NOAA/NGS)
Subject: SVN 19 Anomaly Tests
Date: Thu, 06 Sep 2001 10:43:25 -0400
From: "Frank Lorge"<Frank.Lorge at faa.gov>
To: many addresses
All,
The final test plan for the SVN 19 waveform anomaly test was released
yesterday. The test will be conducted next week, September 10-12.
The goal of the test is to collect data on the failed hardware chain
that caused the anomalous ('evil') waveform in 1993. During the test
the satellite will be set unhealthy and should not create a problem
for users.
The failure was originally detected by differential GPS users using
disparate receivers, and resulted in a relative position error of 3 to
8 meters. Errors of this magnitude would not normally be detected by
most users. As noted above, since the satellite will be set unhealthy
for this test, a normal receiver will not use the satellite in a
solution. Specialized receivers will be used during the test to track
the signal.
Users who do experience problems during the test should report them
through the Coast Guard 24-hour information watch. The phone number
for the watch is (703) 313-5900 and email: nisws at navcen.uscg.mil.
Pilots who experience problems should contact their nearest flight
service station to report the details. Testing will be halted if a
large number of users detect problems.
The detailed schedule follows:
Monday J253/1300 - J254/0306 Configuration 1
Tuesday J254/2003 - J255/0302 Configuration 1
Wednesday J255/2000 - J256/0258 Configuration 2
Notes:
These dates are julian dates. Day 253 is September 10.
All times are in GPS time, which is basically equivalent to UTC. Time
1300 therefore corresponds to 0900 on the east coast.
In Configuration 1, the NDU Baseband and Processor will re-configured
to the A-side, and the L1 MOD-IPA will also be configured on the
A-side.
In Configuration 2, the NDU Baseband and Processor will remain on the
A-side, while the L1 MOD-IPA will be re-configured to the B-side.
Note that transmission of P(Y) on L1 and L2 is at the discretion of
the test operator (2 SOPS/DOUAN.)
Any other comments or requests or requests for additional detail may
be addressed through me.
Frank Lorge
GPS Civil Test Director
frank.lorge at faa.gov
609-485-4588
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