R&S SMW-K44 User Manual page 154

Satellite Navigation
The fast corrections contain the fast correction parameters of MT 2, 3, 4 and 5.
The four messages MT 2, 3, 4 and 5 carry information on the following:
●
●
●
●
Table 13-6: UDRE,
UDREI
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
*) If "Error Correction Mode = Replay Historical Data and Sync Atmosphere & SV
Errors" is enabled, the GPS URA values are automatically set.
**) for UDREI = 14 (not monitored), the GPS URA value is set to average accuracy, i.e.
URA = 5.
Settings:
Display........................................................................................................................ 154
Fast Correction Data
Display
Sets the parameter whose variation over the 24-hour time period is indicated on the
plot.
User Manual 1178.6379.02 ─ 01
The issue of data fast correction (IODF)
User Differential Range Error Indicator (UDREI) and the UDRE
The coarse integrity "use/don't use" alarm ("Alert" flag)
The Pseudo Range Correction (PRC) per PRN for a set of up to 13 PRNs
σ
2
and GPS URA as a function of UDREI
UDRE
UDRE, m
0.75
1.0
1.25
1.75
2.25
3.0
3.75
4.5
5.25
6.0
7.5
15.0
50.0
150
not monitored ("NM")
Do not use ("DNU")
Parameters............................................................................... 155
σ
2 2
, m
UDRE
0.0520
0.0924
0.1444
0.2830
0.4678
0.8315
1.2992
1.8709
2.5465
3.3260
5.1968
20.7870
230.9661
2078.695
not monitored ("NM")
Do not use ("DNU")
SBAS Corrections
SBAS Settings
GPS URA*
2
2
2
2
2
3
3
4
5
5
5
15
10
11
5**
(average accuracy)
15
Do not use ("DNU")
154