Bernese GPS Software Version 5.0 - Bernese GNSS Software

Latitude in degrees
Number of wide-lane ambiguities
56
54
52
50
48
46
44
42+
0
20
15
10
+ 2.5
Total Electron Content in TECU
+ 5
+ 10
+ 7.5
+ 15
+ 12.5
+ 17.5
+
0 5 10 15 20
2.5
+ 17.5
5
+ 20
+ 22.5
+ 15
Local solar time in hours
+ 10
+ 12.5
+ 7.5
(a) Before ambiguity resolution
+ 5
+ 0
+ 0
12.5 Stochastic Ionosphere Modeling Technique
Latitude in degrees
56
54
52
50
48
46
44
42
+ 2.5
+ 2.5
+ 5
Total Electron Content in TECU
+ 7.5
+ 5
+ 10 +10
+ 12.5
+ 15
+ 17.5
+ 12.5
+ 7.5
0 5 10 15 20
+ 20
Local solar time in hours
(b) After ambiguity resolution
Figure 12.22: Regional (or baseline-specific) ionosphere model.
0
-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1
Fractional part of wide-lane ambiguities in cycles
(a) Without ionosphere model
Number of wide-lane ambiguities
20
15
10
5
0
-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1
Fractional part of wide-lane ambiguities in cycles
(b) With ionosphere model
Figure 12.23: Fractional parts of wide-lane ambiguities indicating the (remaining) deterministic
part of the ionosphere.
Figure 12.22 shows a regional ionosphere model as derived from double-difference phase
data of one baseline (a) before and (b) after the QIF ambiguity resolution. Large values
and rms errors for regional TEC parameters often occur due to the limited latitude range
covered. They may be ignored – as in this example – provided that the rms errors for the
actual TEC representation E(β,s), evaluated within the probed area, are reasonable. The
resulting “fractional parts” of the wide-lane ambiguities are shown in Figure 12.23, if (a) no
deterministic TEC parameters are set up and if (b) GIM parameters are estimated.
Bernese GPS Software Version 5.0 Page 277
+ 5
+ 2.5
+ 0
+ 2.5