-80t
North(km) -relative to the base receiver
o
o
= +
mm e
o
0 50 100 150
East(km) -relative to the base receiver
o
Figure 2 2D trajectory of the aeroplane, relative to the
base receiver
(a)
2 T
Bal
= 0
5-4
Zn 2000 4000 6000 8000 10000
5 (b)
NE NE des A0 Jo poi
70 tra iii nié pi einig
0 2000 4000 6000 8000 10000
GPS Time (second)
Figure 3. Real-valued estimates of the cycle slips,
assuming data gaps of one second.
(a)
A
DN 1,-1(cy)
oN
1
N
(b)
A
N
DN -7,9 (cy)
M» o
à
i i i i
0 2000 4000 6000 8000 10000
GPS Time (second)
Figure 4. Real-valued estimates of the cycle slips,
assuming data gaps of 60 seconds
Latitude error (m)
i i
0 2000 4000 6000 8000 10000
1
Le
o
Longitude error (m)
o
=
o
o
i i i
0 2000 4000 6000 8000 10000
Cumulative Tracking Time in Seconds j
Figure 5. Deviations of code DGPS position solutions:
(a) for the latitude component: o=9.384m; and (b) for
the longitude component: o= 7.348m
Filtering (-) and Smoothing (—) Solutions
Latitude error(m)
N & Qo
E ————— iX à — — fea 2— —— €
Q 20 40 60 80 100
Cumulative Tracking Time in Seconds(1- 1 00)
-
o
Latitude error(m)
o
Oo u =
1
o
o
TO 2000 4000 6000 8000 10000
Cumulative Tracking Time in Seconds(1 00-9300)
Figure 6. Convergence of the latitude filtering solutions
with tracking time. Its standard deviation o= 0.255m
and the bias of smoothing solution: 6 = +0.161m .
Filtering(-) and Smoothing (--) Solutions
— 10 T T
E :
A second
= :
> -5 Le à 4 A
-10 1 i i i
0 20 40 60 80 100
Cumulative Tracking Time in Seconds(1-1 00)
p 0 T T T
E
E -0.5
«
=
= 1)
=
5
-1.5
i i i
0 2000 4000 6000 8000 10000
Cumulative Tracking Time in Seconds(1 00-9300)
Figure 7. Convergence of the latitude filtering solutions
with tracking time. Its standard deviation o— 0.223m.
and the bias of smoothing solution: ó ^ -0.138m .
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B1. Vienna 1996
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