Ionospheric influence on LatPos performance
PhD student Didzis Dobelis Latvial Geospatial Information Agency GNSS PERMANENT BASE STATION DIVISION
Dr.sc.ing. Jānis Zvirgzds Latvial Geospatial Information Agency GNSS PERMANENT BASE STATION DIVISION
3rd EUPOS® Council and Technical Meeting 14 – 15 November 2016 Content:
• Ionosphere, The Sun, Effect on GNSS;
• Yearly LatPos test procedure;
• Performance of LatPos during high ionospheric activity;
• Discussion;
2 Slide by Knut Stanley Jacobsen (Kartverket) 3 Slide by Knut Stanley Jacobsen (Kartverket) 4 Yearly LatPos test procedure
1. Initialization time – Time to FIX 2. Initialization repeating – number of measurements - in same point with different FIX - different TYPE of FIX (MAX,iMAX,SINGLE-SITE,VIRTUAL-RS) - In time span up to HOUR 3. RTK stability in time span – Hour 4. Post processing.
5 Yearly LatPos test procedure
UGAL TOR2
IKLA VOR2 RUHN Valka Mazsalaca Valmiera Irbene Alūksne Limbaži Palsmane Talsi Riga Sigulda Balvi Lode Kuldīga Tukums Liepāja Ojārs Madona Lielvārde Saldus Dobele Rēzekne Vaiņode Jēkabpils Bauska Mazeikiai Birzai Joniski Preiļi Dagda Kretinga Rokiskis LatPos base stations Daugavpils Dukstas Neighboring stations
Area for test measurements - 6 points (2nd order Geodetic network) Measurements done in October 11-13, (2 points per day) What happened?
A filament in Sun's northeast quadrant erupted between 15:00 and 17:00 UTC on Saturday, October 8, 2016, producing an asymmetric, partial-halo CME. The CME, although faint, was first observed in LASCO C2 imagery beginning 00:48 UTC on October 9.
Source: NOAA/SWPC Boulder, CO USA 7 What happened?
Source: Royal Observatory of Belgium GNSS Research Group http://gnss.be/Atmospheric_Maps/ionospheric_event.php?date=2016-10-13 8 LatPos stations used for VTEC calculations
UGAL TOR2
IKLA VOR2 RUHN Valka Mazsalaca Valmiera Irbene Alūksne Limbaži Palsmane Talsi Riga Sigulda Balvi Lode Kuldīga Tukums Liepāja Ojārs Madona Lielvārde Saldus Dobele Rēzekne Vaiņode Jēkabpils Bauska Mazeikiai Birzai Joniski Preiļi Dagda Kretinga Rokiskis LatPos base stations Daugavpils Dukstas Neighboring stations
Ojars, Irbene, Vainode, Aluksne, Daugavpils Calculated VTEC October 12, 2016
40,00
35,00
30,00
25,00
20,00 VTEC VTEC in TECU
15,00
10,00
5,00
0,00 a b c d e f g h i j k l m n o p q r s t u v w x Hours
10 Calculated VTEC October 12 and 13, 2016
40,00
35,00
30,00
25,00
20,00 VTEC VTEC in TECU
15,00
10,00
5,00
0,00 a b c d e f g h i j k l m n o p q r s t u v w x Hours
11 LatPos Network server Fixed ambiguities October 12, 2016
12 LatPos Network server Fixed ambiguities October 13-14, 2016
13 LatPos Network server Tracked satellites and Fixed satellites
Station IRBE (13.10)
14 LatPos Network server Tracked satellites and Fixed satellites
Station IKLA (14.10.)
15 FIX results on point ’’Gricgale’’ average time-to-FIX: 18 sec (12 sessions)
1 6 FIX results on point ’’Slāte’’ average time-to-FIX: 42 sec (7 sessions)
Time to FIX 00:01:56
Time to FIX 00:02:05
1 7 RTK Stability ’’Vižuļi’’ (MAX)
1 8 RTK Stability ’’Vižuļi’’ (MAX)
1 9 RTK Stability ’’Vižuļi’’ (MAX)
2 0 Thank You for attention!
QUESTIONS?
E-mail: [email protected] WEB: www.latpos.lgia.gov.lv