plot1_gpscomp_clr.ps (Color) 

A color postscript plot which shows the effect of the GPS correction
on the INS east component of the groundspeed vector.  For comparison
purposes, the GPS correction performed at NOAA/NSSL is also included.
The data presented is from N42RF flying a level and straight leg on 13
November, 1992.  On the lower plot, the UCI and NOAA/NSSL corrections
to the raw INE east component groundspeed are plotted as well as the
difference between raw GPS and raw INE.  In the UCI GPS-correction the
periodic "jumps" (with a period of approx. 30 sec.) in the GPS
groundspeed data are filtered out.  It is believed that these "jumps"
are characteristic of the Trimble 2100 GPS system and are not
representative of the real motion of the aircraft.  For this reason,
as shown in the lower plot, the UCI GPS-corrected groundspeed retains
the high-frequency information of the INE output and uses the low
frequency portion of the GPS data to produce a GPS-corrected INE
groundspeed.


plot1_gpscomp_bw.ps (B & W)

The same plot as plot1_gpscomp_clr.ps, but in black and white.