Poster sessions will take place physically over two days in the Dabney Lounge, and will be available for digital viewing and download throughout the workshop in our “virtual poster session.” Be sure to view submission specifications
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This poster session invites all global analysis centers of the IGS to give a status report on their activities of the last two years. Of particular interest are the latest achievements and/or developments and the effect they have (or will have) on the IGS products. Of most interest for the IGS community would be to explain which processing and or modelling changes were made and to what extend they have improved your products. Of course this poster session is "the place" to present your (A)AC, the products you are generating, and other contributions you are making to the IGS as a whole. This invitation focuses on the analysis centers, the associated analysis centers and analogue components of the IGS.
In recent years, the absolute IGS antenna phase center model igs08.atx was complemented with GLONASS-specific receiver antenna calibrations as well as with an extension for the GPS satellite antenna phase center variations (PCVs) up to a maximum nadir angle of 17 degrees derived from low Earth orbiter (LEO) data. Open issues concerning the satellite antennas are, amongst others, phase center corrections for the new GNSS (Galileo, BeiDou, QZSS, etc.), azimuth-dependent PCVs, group delay variations and the combined processing of terrestrial and LEO data. As the latter strategy would allow the estimation of phase center corrections for the satellite antennas without fixing the terrestrial scale derived from other space geodetic techniques, the IGS would be able to provide an independent scale.
As regards the receiver antennas, more and more calibration facilities are installed. Therefore, a careful comparison of the independent results is important to avoid systematic errors. In the case of significant PCV differences, the comparison of coordinate results with “ground truth” measurements could help to decide which PCVs provide the better results in the position domain. In accordance with the satellite antennas, also group delay variations of the receiver antennas as well as phase center corrections for new GNSS and new signals are of particular interest. The latter can only be derived from anechoic chamber measurements. Further challenges with respect to the receiver antennas are the mitigation of near- and far-field multipath, the impact of uncalibrated radomes within the IGS network or the possible benefit of individual antenna calibrations.
|I. Rodriguez Perez|
In the face of a steadily growing multi-signal, multi-constellation global navigation satellite system (GNSS), careful treatment of involved biases becomes a more and more challenging task. For data processing techniques developed to cope with all available GNSS signal and satellites, adequate modeling, determination, or calibration of all disruptive biases is indispensable to exploit the full potential of multi-GNSS.
Poster submissions focusing on any bias-related issue are encouraged, specifically contributions on: various linear combinations of GNSS differential code biases (DCB), differential code-phase receiver biases (DCPB) relevant to GLONASS receiver interoperability, (handling of) biases relevant to quasi-undifferenced ambiguity resolution, intersystem bias issues, line bias variations, (absolute) bias calibrations, etc. Finally, we believe that for highest-precision GNSS applications, station coordinate realizations (thus ITRF) specific to each considered system might become tangible (strongly connected to antenna WG core task).
The archives of the IGS data centers are an essential component of the service. The data centers not only support the operational infrastructure of the service but also the many working groups and pilot projects established within the IGS. The IGS Data Center Working Group (DCWG) addresses the problems facing the IGS data centers as well as develops new ideas to aid users both internal and external to the IGS. The DCWG poster session will focus on recent data center developments, data center support of the IGS Real-Time Service (RTS) and the M-GEX campaign, Infrastructure Committee-related topics, utilities developed for data discovery, and other general data center topics.
In order to obtain centimeter position accuracy from GNSS measurements, it is necessary to estimate the excess path delay encountered by GNSS signals as they pass through the neutral atmosphere (troposphere). One can treat the so-called troposphere delay as a nuisance parameter (estimate and discard), or use the GNSS measurements as a means to obtain troposphere delay estimates, which in turn can be used to estimate meteorological parameters such as precipitable water (PW). In short, GNSS measurements can be applied to meteorology or climate-change studies. The former requires a high spatial density of stations and real-time or near-real-time troposphere estimate production. The latter requires long-term homogeneity of models, so that trends can be safely attributed to climate change as opposed to processing artifacts.
In this session, we welcome submissions related to GNSS-based troposphere delay: computation/distribution of estimates, research into mapping functions and models, applications of troposphere estimates to meteorology/climate change/atmospheric studies, comparison of GNSS-based estimates with those obtained from other methods (e.g., radiometry, VLBI, numerical weather models), impact of troposphere delay estimates on timing or positioning, and other topics.
Precision timing is a critical element of navigation and geolocation services. Precise clock products, especially those pertaining to the clocks on-board the various GNSS satellites, are essential supplements to satellite ephemeris information in supporting precise point positioning applications. These products are also increasingly important in the timing community in supporting applications like time and frequency transfer or the remote comparison of precision clocks. Within the IGS, the Clock Products Working Group (CPWG) maintains and explores a collection of services and clock products supporting positioning, navigation, timing, time scale formation, and time and frequency dissemination. Accordingly, the GNSS Clocks session hosted by the CPWG is open to submissions related to a wide range of clock-related and timing oriented topics including but not limited to:
- Improvements or developments related to GNSS clocks or clock products
- GNSS methods developments or improvements related to time and/or frequency transfer or remote clock synchronization
- Ground or GNSS space clock technology research or developments
- GNSS or ground clock data analysis
- Methods and/or algorithms for timescale computation especially as pertains for use in GNSS systems
|G. Carlos Alexandre|
Total Electron Content (TEC) is important because of the dispersive effect it has on any trans-ionospheric radio signals which leads to a frequency dependent delay and refraction of the signals. Space geodetic techniques such as GNSS (ground- and satellite-based), DORIS, VLBI, satellite altimetry or the GPS radio occultation missions (e.g Formosat-3/COSMIC, TerraSAR-X) can provide valuable information on the electron density. The potential for ionospheric sensing using these techniques has improved considerably over the last few years
This session will be a forum for discussing
- Algorithms and models for processing, calibrating and improving the precision of TEC measurements,
- Applications of TEC measurements for augmentation and improvement of the accuracy of GNSS based navigation, surveying and aircraft landing systems and for prediction of TEC,
- Possible improvements of the IGS ionospheric products,
- Methods to correct for higher-order ionospheric delays in GNSS,
- Occultation measurements,
- Inter-frequency bias calibrations, etc.
The session also includes a summary of the activities of the IGS Ionosphere Working Group.
The IGS Infrastructure is the backbone of all the IGS services, encompassing stations, data formats, data storage, antenna calibrations, etc. In this session we will cover the current state of the IGS infrastructure elements to provide an overview of the state of the IGS station network, the data formats (RINEX and real-time), data centers, and antenna calibration issues. We welcome contributions to this session covering these topics and highlighting significant events and developments.
Speaking slots are limited due to time constraints but all contributions will be considered for oral/poster presentation, please indicate your preference. They will be considered by the invitations for the related plenary sessions.
|M. van Kints|
As the breadth of IGS products have grown and accuracy has improved over the past two decades, so has their impact on science and geodetic infrastructure. This session solicits general contributions, not covered elsewhere in the workshop program, that highlight applications of IGS products for geodesy and geophysics research. Examples are millimeter-level global geodesy; geodynamics; glacial isostatic adjustment; regional networks for deformation, weather, and surveying; precise timing; Earth orientation; hydrologic and atmospheric loading; sea level change; low Earth orbiting satellites; and other topics of general interest. The session will not only address how these applications are benefiting from the IGS, but also how a better understanding and modeling of geophysical processes can lead to future improvement in geodetic infrastructure and accuracy.
This poster session invites all contributions related to the activities of the Working Group on Space Vehicle Orbit Dynamics, including studies on orbit prediction and orbit determination, force modelling, attitude modeling (particularly focusing on the recent studies of various satellites in eclipse season) and the impact of refined orbit/attitude models on estimated station positions, time series and the terrestrial reference frame.
The International GNSS Service (IGS) has, over many years, set the gold standard for high-precision GPS and GLONASS measurement modeling and analysis. To pave the way for a future provision of high-quality data and products for all constellations, the IGS has initiated the Multi-GNSS Experiment (MGEX). It serves as a framework for increasing the overall awareness of multi-GNSS within the scientific and engineering communities, as well as to familiarize IGS participants and users with the new navigation systems. Data from a global multi-GNSS network covering BeiDou, Galileo, QZSS and SBAS have now been collected for almost two years and provide the basis for early data products.
This session invites poster contributions demonstrating new results and experience in the collection and processing of multi-GNSS observations. Fields of interest include, for example, the characterization of multi-GNSS equipment and observations, the development and validation of new multi-GNSS processing strategies, the proper modeling of new GNSS satellites, as well as new multi-GNSS products (orbits, clocks, biases, ionosphere, etc.). Contributions building on data and products from the IGS MGEX project are specifically encouraged
The IGS launched its Real-Time Service (RTS) in April 2013 after more than a decade of effort and the completion of a successful Real-Time Pilot Project involving more than thirty IGS agencies. The RTS is now delivering low latency GNSS data and satellite orbit and clock corrections to a broad spectrum of users for a wide array of applications. Since launch, more than three hundred users have registered for access to RTS products. User applications are varied and come from many distinct communities ranging from academic research and instruction, to surveying, mapping and GIS, to time synchronization.
This session invites posters from a broad range of RTS topics. We are seeking contributions from our user communities and from agencies that play a role in the day-to-day delivery of the service. In all cases we hope to learn from your experiences and your vision for the future of the RTS.
GNSS play a fundamental role in the elaboration and dissemination of the International Terrestrial Reference Frame (ITRF), in the monitoring of the Earth's rotation and in the study of geophysical ground deformations. However, GNSS station positions and Earth Orientation Parameters (EOPs), derived, e.g., by the IGS Analysis Centers, have been demonstrated to be affected by systematic errors of different types and various origins. This session therefore invites poster contributions related to the characterization, understanding and mitigation of systematic errors in GNSS-derived station positions, EOPs and geocenter motion estimates.
Contributions addressing the following topics are in particular welcome:
- Terrestrial frames and EOPs from the 2nd IGS reprocessing campaign: result analysis, improvements over the 1st IGS reprocessing and expected benefits for ITRF2013;
- From weekly to daily IGS terrestrial frames: what can we learn from the henceforth daily resolution of IGS station positions?
This session is additionally intended to discuss the definition of the IGS Reference Frames (RF) and their realization by the various IGS products. The IGS RF have so far been based on the successive ITRF realizations and updated every few years. Due to position discontinuities at RF stations and growing velocity propagation errors, they have thus been subject to progressive degradation, with impacts on the referencing of the IGS products. Contributions on the following topics are therefore encouraged:
- Quantification, analysis and mitigation of RF instability effects in the IGS products;
- New strategies for the definition of “evaluative” IGS Reference Frames.
Since the beginning of the GPS era numerous studies have revealed and addressed the uncertainty in the GNSS height component. Especially when studying sea level changes, where the results from GNSS processing are used to height-correct tide gauge time series and to define a stable and consistent global datum, reliable vertical positions and velocities are essential.
Addressing the height component in routine computation and establishing and maintaining new and existing geodetic ties to tide gauge benchmarks are an important contribution for example for climate change studies, for establishing a unified height datum, or for coastal subsidence monitoring. This session solicits contributions that address the objectives of the IGS Tide Gauge Benchmark Monitoring (TIGA) Working Group. Of interest are contributions that describe the status and development of geocentric coordinates and time series of the TIGA station network on a regular basis, the status and plans for future TIGA network extensions, and applications which make use of results from the TIGA processing.