Introduction, Overview, Current Status, Bias ProductsFederal Office of Topography swisstopo...
Transcript of Introduction, Overview, Current Status, Bias ProductsFederal Office of Topography swisstopo...
Federal Office of Topography swisstopo
Introduction, Overview, Current Status, Bias Products
Stefan Schaer Swiss Federal Office of Topography (swisstopo) / CODE@AIUB
2 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
3 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
Presentations available at: www.biasws2012.unibe.ch
4 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
List of GNSS biases
• GNSS differential code biases (DCB) ionosphere • GNSS ionosphere-free LC code biases clock analysis • GLONASS interfrequency code biases (relevant to GNSS
clock analysis, or PPP) • “DCPB” crucial for GLONASS ambiguity resolution • Intersystem phase biases (or drifts) • Line bias variations (or inconsitencies) • Uncalibrated phase delays (UPD) relevant to undifferened
integer fixing for PPP • GLONASS-GPS station-specific intersystem translations as
considered in CODE’s GNSS analysis • (GPS) quarter-cycle issue • Further CODE specialties (e.g., DCB multiplier estimation)
5 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
SINEX_BIAS V1.00: Sign Convention
6 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
SINEX_BIAS V1.00: Total Bias and DCB
7 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
GPS C1, P1 and P2 Codes and Receiver Types According to: http://www.navipedia.net/index.php/GPS_C1,_P1_and_P2_Codes_and_Receiver_Types
8 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
CODE’s GPS/GLONASS P1-C1 DCB monthly solution, computed for September 2015 (directly from RINEX)
9 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
CODE’s GPS/GLONASS P2-C2 DCB monthly solution, computed for September 2015 (directly from RINEX)
10 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
CODE’s GPS/GLONASS P1-P2 DCB monthly solution, computed for September 2015
11 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
CODE’s GPS P1-P2 DCB monthly solution, computed for September 2015
12 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
CODE’s GLONASS P1-P2 DCB monthly solution, computed for September 2015
13 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
AC GLONASS bias files collected for comparison (GPS weeks 1666-1667) • COD Center for Orbit Determination in Europe, AIUB, Switzerland
- Bernese DCB • EMR Natural Resources Canada, Canada
- no GLONASS bias information (GLONASS biases ignored in GNSS clock analysis)
• ESA European Space Operations Center, ESA, Germany - bias-SINEX (first two days of GPS week 1666 missing)
• GFZ GeoForschungsZentrum, Germany - bias-SINEX
• GRG GRGS-CNES/CLS, Toulouse, France - modified Bernese DCB
• IAC Information-Analytical Centre, Russia - PBS format
• JPL Jet Propulsion Laboratory, USA - GIPSY time dependent parameter format (wrong weeks)
14 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
Station 1 Station 2 Station 3
Satellite 1 Satellite 2 Satellite 3 Satellite 4
GLO
NAS
S cl
ock
offs
et
Datum definition for GLONASS biases (1)
15 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
Station 1 Station 2 Station 3
Satellite 1 Satellite 2 Satellite 3 Satellite 4
GLO
NAS
S cl
ock
offs
et
Datum definition for GLONASS biases (2)
16 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
Station 1 Station 2 Station 3
Satellite 1 Satellite 2 Satellite 3 Satellite 4
GLO
NAS
S cl
ock
offs
et
Datum definition for GLONASS biases (3)
17 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
Station 1 Station 2 Station 3
Satellite 1 Satellite 2 Satellite 3 Satellite 4
GLO
NAS
S cl
ock
offs
et
Datum definition for GLONASS biases (4)
18 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
AC GLONASS bias comparison: COD-ESA (1)
19 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
AC GLONASS bias comparison: COD-ESA (2) sign changed
20 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
AC GLONASS bias comparison: COD-ESA (2) sign changed
21 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
AC GLONASS bias comparison: COD-ESA (3) P1-C1 DCB corrected
22 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
Summary of AC GLONASS bias comparison
AC Median (ns) Mean (ns) Std (ns)
COD-ESA 0.01 0 0.79
COD-GFZ 0.02 0 1.33
COD-GRG 5.63 1.87 23.12
ESA-GFZ 0.01 0 1.34
ESA-GRG 4.14 1.29 20.63
GFZ-GRG 6.00 1.72 25.23
23 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
Summary and conclusion
• Best agreement (smallest std) could be achieved for the comparison between COD and ESA - with an overall std of 0.79 ns - resulting in a single-AC std of 0.56 ns
• Only 24 constants were necessary to compensate for the GLONASS bias datum definition specific to each AC
24 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
25 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
26 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
27 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
28 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
LS combination of CODE’s accumulated IGSFINAL and EPNFINAL SDByyssss.LST results (WL)
ASHTECH Z18 : 22.120 2.268
JAVAD TRE_G3TH DELTA: 218.901 0.675
JPS EGGDT : 58.271 0.606
JPS E_GGD : 128.505 0.565
JPS LEGACY : 111.921 0.609
LEICA GRX1200+GNSS : -269.900 0.753
LEICA GRX1200GGPRO : -242.546 0.484
NOV OEMV3 : -247.286 0.516
SEPT POLARX3ETR : -501.984 0.533
TPS EGGDT : 70.275 0.726
TPS EUROCARD : 155.776 0.652
TPS E_GGD : 121.529 0.868
TPS LEGACY : 92.682 0.517
TPS NETG3 : 52.682 0.507
TPS ODYSSEY_E : 57.586 0.611
TRIMBLE NETR5 : 96.551 0.515
TRIMBLE NETR8 : 74.919 0.908
Receiver type SD bias RMS error (ns)
29 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
30 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
31 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
32 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
33 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
34 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
35 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
36 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
37 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
38 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
Mean GLONASS-GPS troposphere ZPD biases: CODE IGS (global) weekly results
GLONASS-GPS troposphere ZPD biases
(for up to 143 IGS GNSS stations)
-0.5
0
0.5
1
1.5
2
1615 1620 1625 1630 1635 1640
Time (GPS week)
Trop
osph
ere
ZPD
bias
(mm
)
MeanMedian
Model switch from IGS05 to IGS08
39 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
Station 1 Station 2
Satellite 1 Satellite 2
Mixture of different code observables (and biases!) is crucial for code-based widelane ambiguity resolution (1/2)
(C1P,C2W)
(C1C,C2W) (C1P,C2W)
(C1C,C2W)
Satellite-specific biases are relevant
40 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
Station 1 Station 2
Satellite 1 Satellite 2
Mixture of different code observables (and biases!) is crucial for code-based widelane ambiguity resolution (2/2)
(C1P,C2W)
(C1C,C2W) (C1C,C2W)
(C1C,C2C)
Satellite-specific biases are relevant
Station-specific biases are relevant (!!)
41 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
CODE’s GPS P1-C1 DCB monthly solution, computed for September 2015 (directly from RINEX)
42 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
CODE’s GLONASS P1-C1 DCB monthly solution, computed for September 2015 (directly from RINEX)
43 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
CODE’s GPS P2-C2 DCB monthly solution, computed for September 2015 (directly from RINEX)
44 Swiss Federal Office of Topography (swisstopo) IGS Workshop on GNSS Biases, November 5-6, 2015, Bern, Switzerland
CODE’s GLONASS P2-C2 DCB monthly solution, computed for September 2015 (directly from RINEX)