HG contribution to the GRC and more Dzana Horozovic Retreat 2019 Hohe Wand, 15-17 May 2019

Current activity Galileo Reference Center H2020 Call managed by the GSA (GRC – MS Consortium) WP 3.4: NeQuick G performance Aim of the WP: To study and analyze the performance of the NeQuick G ionospheric model in different latitudinal regions Comparison to the GPS Klobuchar model Evaluation based on data from stations in three latitude regions WP Technical coordination: Norvegian Mapping Authority NMA NO WP Participants: TU Wien (Tech University of Vienna) TUV AT University of Porto FCUP PT Space Research Centre, Polish Academy of Sciences SRC/CBK PL Hohe Wand, 15-17 May 2019

Galileo Reference Center High latitudes (above 55° north) Central European latitudes Azores and equatorial region Hohe Wand, 15-17 May 2019

NeQuick G at TUW – Analysis chain   Calculate TEC values for each pair station-satellite Load input data: Extract Galileo ionospheric corrections from header of navigation files (a0, a1, a2) Get station positions w.r.t. ITRF2014 Get satellite positions w.r.t. ITRF2014 Get month, time of day (UTC) Interpolate TEC over grid for mid-lat region Write IONEX file Plot VTEC map Plot VTEC difference map (w.r.t. CODE) TEC comparison Site specific range differences (m) Site specific residual iono slant error (TECU) Compute TEC values from observations 2 1 3 4 Hohe Wand, 15-17 May 2019

TUW regional (TUWR) - overview Network: 35 permanent ground stations Start DoY: 274 (2018) Grid size: 0.5°x 0.5° Coverage: +30° to +65° lat, -15° to +45° lon Temporal resolution: 1h (25 maps in file) Observation type: geometry-free zero- difference code and carrier phase Sat.system: GPS+Galileo Integrated electron density: Described by spherical harmonics (up to degree 6) Post-processing mode Hohe Wand, 15-17 May 2019

TUW regional (TUWR) – Mapping function MSLM (Modified Single-Layer Model) All free electrons are concentrated in a shell of infinitesimal thickness at an effective height H (height of maximum electron density at the F2 peak and ranges from 350 km to 450 km. 𝑭 𝑰 𝒛 = 𝑬 𝑬 𝑽 = 𝟏 𝒄𝒐𝒔 𝒛′ 𝒔𝒊𝒏 𝒛′ = 𝑹 𝑹+𝑯 𝒔𝒊𝒏 𝜶𝒛 𝑤ℎ𝑒𝑟𝑒 𝑧, 𝑧 ′ …𝑧𝑒𝑛𝑖𝑡ℎ 𝑑𝑖𝑠𝑡𝑎𝑛𝑐𝑒𝑠 𝑎𝑡 𝑡ℎ𝑒 ℎ𝑒𝑖𝑔ℎ𝑡𝑠 𝑜𝑓 𝑡ℎ𝑒 𝑠𝑡𝑎𝑡𝑖𝑜𝑛 𝑎𝑛𝑑 𝑜𝑓 𝑡ℎ𝑒 𝑠𝑖𝑛𝑔𝑙𝑒 𝑙𝑎𝑦𝑒𝑟 𝑅……𝑚𝑒𝑎𝑛 𝑅𝑎𝑑𝑖𝑢𝑠 𝑜𝑓 𝑡ℎ𝑒 𝐸𝑎𝑟𝑡ℎ 𝐻……ℎ𝑒𝑖𝑔ℎ𝑡 𝑜𝑓 𝑡ℎ𝑒 𝑠𝑖𝑛𝑔𝑙𝑒 𝑙𝑎𝑦𝑒𝑟 𝑎𝑏𝑜𝑣𝑒 𝑡ℎ𝑒 𝐸𝑎𝑟𝑡 ℎ ′ 𝑠 𝑠𝑢𝑟𝑓𝑎𝑐𝑒 (450 km) 𝛼……𝑐𝑜𝑟𝑟𝑒𝑐𝑡𝑖𝑜𝑛 𝑓𝑎𝑐𝑡𝑜𝑟 Single-layer model Hohe Wand, 15-17 May 2019

TUW regional (TUWR) - LC Geometry-free linear combination (L4) 𝑳 𝟒 =−𝒂 𝟏 𝒇 𝟏 𝟐 − 𝟏 𝒇 𝟐 𝟐 𝑭 𝑰 𝒛 𝑬 𝜷,𝒔 + 𝑩 𝟒 𝑷 𝟒 =+𝒂 𝟏 𝒇 𝟏 𝟐 − 𝟏 𝒇 𝟐 𝟐 𝑭 𝑰 𝒛 𝑬 𝜷,𝒔 + 𝒃 𝟒 𝑤ℎ𝑒𝑟𝑒 𝐿 4 , 𝑃 4 ……………….𝑔𝑒𝑜𝑚𝑒𝑡𝑟𝑦−𝑓𝑟𝑒𝑒 𝑝ℎ𝑎𝑠𝑒 𝑎𝑛𝑑 𝑐𝑜𝑑𝑒 𝑜𝑏𝑠𝑒𝑟𝑣𝑎𝑏𝑙𝑒𝑠 (𝑖𝑛 𝑚𝑒𝑡𝑒𝑟𝑠) 𝑓 1 , 𝑓 2 ……………….𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑖𝑒𝑠 𝑎𝑠𝑠𝑜𝑐𝑖𝑎𝑡𝑒𝑑 𝑤𝑖𝑡ℎ 𝑡ℎ𝑒 𝑐𝑎𝑟𝑟𝑖𝑒𝑟𝑠 𝐿 1 𝑎𝑛𝑑 𝐿 2 𝑎……………………𝑐𝑜𝑛𝑠𝑡𝑎𝑛𝑡 (=4.03∗ 10 17 𝑚𝑠 −2 𝑇𝐸𝐶𝑈 −1 ) 𝐹 𝐼 𝑧 ……………….𝑚𝑎𝑝𝑝𝑖𝑛𝑔 𝑓𝑢𝑛𝑐𝑡𝑖𝑜𝑛 𝑓𝑜𝑟 𝑧𝑒𝑛𝑖𝑡ℎ 𝑑𝑖𝑠𝑡𝑎𝑛𝑐𝑒 𝑧′ 𝐸 𝛽,𝑠 …………….𝑣𝑒𝑟𝑡𝑖𝑐𝑎𝑙 𝑇𝐸𝐶 𝑖𝑛 𝑇𝐸𝐶𝑈 𝑎𝑠 𝑎 𝑓𝑢𝑛𝑐𝑡𝑖𝑜𝑛 𝑜𝑓 𝑔𝑒𝑜𝑔𝑟𝑎𝑝ℎ𝑖𝑐 𝑜𝑟 𝑔𝑒𝑜𝑚𝑎𝑔𝑛𝑒𝑡𝑖𝑐 𝑙𝑎𝑡𝑖𝑡𝑢𝑑𝑒 𝛽 𝑎𝑛𝑑 𝑠𝑢𝑛−𝑓𝑖𝑥𝑒𝑑 𝑙𝑜𝑛𝑔𝑖𝑡𝑢𝑑𝑒 𝑠 𝐵 4 = 𝜆 1 𝐵 1 − 𝜆 2 𝐵 2 ..𝑐𝑜𝑛𝑠𝑡𝑎𝑛𝑡 𝑏𝑖𝑎𝑠 𝑖𝑛 𝑚𝑒𝑡𝑒𝑟𝑠 𝑑𝑢𝑒 𝑡𝑜 𝑡ℎ𝑒 𝑖𝑛𝑖𝑡𝑖𝑎𝑙 𝑝ℎ𝑎𝑠𝑒 𝑎𝑚𝑏𝑖𝑔𝑢𝑖𝑡𝑖𝑒𝑠 𝐵 1 𝑎𝑛𝑑 𝐵 2 𝑤𝑖𝑡ℎ 𝑡ℎ𝑒 𝑐𝑜𝑟𝑟𝑒𝑠𝑝𝑜𝑛𝑑𝑖𝑛𝑔 𝑤𝑎𝑣𝑒𝑙𝑒𝑛𝑔𝑡ℎ𝑠 𝜆 1 𝑎𝑛𝑑 𝜆 2 Hohe Wand, 15-17 May 2019

Results delivered to GRC Daily VTEC maps for Central Europe Daily VTEC difference maps for Central Europe w.r.t CODE Daily site specific range difference plots Daily site specific residual IONO Slant Error plots Quarterly reports Deliverables being uploaded to BKG database Hohe Wand, 15-17 May 2019

Results delivered to GRC (1) - Maps DoY 318/2018 (TUWR) DoY 318/2018 (NEQG) Hohe Wand, 15-17 May 2019

Results delivered to GRC (2) – Diff.maps DoY 318/2018 (TUWR) DoY 318/2018 (Klobuchar) Differences w.r.t. CODE: TUWR up to 2 TECU NeQuick G up to 5 TECU Klobuchar up to 10 TECU DoY 318/2018 (NEQG) Hohe Wand, 15-17 May 2019

Results delivered to GRC (3,4) Sites for validation: NICO 30°-40° lat AJAC GRAS 40°-50° lat LEOP JOZ2 50°-55° lat Hohe Wand, 15-17 May 2019

Results delivered to GRC (3) – Range difference (L1+model w. r Results delivered to GRC (3) – Range difference (L1+model w.r.t ionosphere-free LC, DoY 318/2018) Hohe Wand, 15-17 May 2019

Results delivered to GRC (3) – Statistics Daily mean range difference residuals for all validation sites and all elevation angles Hohe Wand, 15-17 May 2019

Results delivered to GRC (4) – IONO slant error Specification defined by the project Hohe Wand, 15-17 May 2019

Results delivered to GRC (4) – IONO slant error Hohe Wand, 15-17 May 2019

Results delivered to GRC (4) – Statistics Daily mean percentage of epochs outside the NEQG specification (Jan-Mar 2019) Hohe Wand, 15-17 May 2019

Other activities GEOWEB (March 2016 – October 2018) Final Meeting, Tirana, Albania, 02-04 October 2018 GNSS (GPS+Galileo) based ERP estimation + Tidal coefficients estimation EGU 2018 (April) – dataset Feb-Jul 2017 (6 months) INTERGEO 2018 (October) – dataset Jul-Dec 2017 (6 months) Hohe Wand, 15-17 May 2019

Other activities Determination of High Frequency Earth Rotation Parameters utilizing GPS + Galileo observation data (presented at Intergeo 2018) Polar motion time series (July 2017-Dec. 2017) w.r.t. IERS2010 GPS/GAL Differences up to 0.5mas (Std: +/-0.2 mas) GPS Differences up to 1mas (Std: +/-0.28 mas) Some remaining signals in series Hohe Wand, 15-17 May 2019

Other activities Determination of High Frequency Earth Rotation Parameters utilizing GPS + Galileo observation data (presented at Intergeo 2018) LOD time series (July 2017-Dec. 2017) – raw LOD Hohe Wand, 15-17 May 2019

Other activities Determination of High Frequency Earth Rotation Parameters utilizing GPS + Galileo observation data (presented at Intergeo 2018) Corrections to the IERS2010 Model for the 10 main tides up to: 16 μas derived from GPS+Galileo series 23 μas derived from GPS series X-pole residual amplitudes GPS/Galileo – IERS2010 and GPS - IERS Hohe Wand, 15-17 May 2019

Ionospheric modelling Future plans Continue the work on ERP estimation  improve solution 2 parameter types to incorporate in PhD work: ERPs Ionospheric modelling Based on Global network 2 solutions: GPS+Galileo GPS only Based on Regional network Hohe Wand, 15-17 May 2019

Future plans Compare two different solutions in order to study the improvement provided by Galileo (if existing) - so far, ERP comparisons showed a visible improvement when using the combined solution, but longer timeseries are definitely needed Encourage multi-GNSS users to include more GPS+Galileo combined solutions Write PhD related article in a journal paper in the near future Hohe Wand, 15-17 May 2019

Thank you for your attention! Hohe Wand, 15-17 May 2019