Drift determination 2013-11-17
With the instruction file urtap-bigtidesww.ins
ins4env urtap-bigtidesww.ins
a drift model has been estimated. There is compelling evidence that
the drift underwent a radical change as a consequence of the repair
work in February 2011.
First solution: An exponential with fixed decay time plus a
box-car&slope
27 R urtap.tse
#21,'BIN',-99999.0,'L:BARO|VAL',0,0,-9 = BARO
BEGIN_HS 01
% ( From 2011 02 24 00 To 2013 05 17 23 ) = SLP2
t #27 EDECAY = EDEC
END
urtap.tse:
TSF EDIT EDECAY
EXP 1.d0 -2.2663D-03 Tref 2011 02 24 00 00
00 00 From 2011 02 24 00 00 00 00
RMSD
END
tsd -n 34000,1,c -E expstart.tse,E
o/g090701-130515-1h-lapww.rh01.ts
There is a decrease of the drift rate.
A tail of the initial exponential decay from mid June 2009
(installation) can be seen. Its amplitude was -186.47 nm/s2.
The exponential decay after February 24, 2010, has an estimated
amplitude of 95.53 +-0.73 nm/s2 (note the opposite
sign!)
The result is still preliminary - expfitbm should be used to also
solve for the decay time.