document title / titre du document TRP W ORK PLAN ... - emits - ESA

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TRP Work Plan 2005-2007 Description of Activities TEC-SB/7935/dc 12/Feb/09 5.4 - Mobile Communications TRP Reference: Title: T502-06EE Simulation of the satellite to indoor propagation channel at L and S bands The main objective of this activity is the characterisation through simulation of the propagation effects in the satellite to indoor channel at L and S frequency bands. This activity involves several tasks: Task 1: develop a precise 3-D characterisation of different types of buildings such as warehouses, office buildings, shops and shopping malls, factories, apartment blocks and single family dwellings taking into account the electrical properties of the different construction materials and elements. Task 2: carry out simulations with a validated deterministic electromagnetic propagation model in all the previously generated buildings for different geometrical configurations (satellite elevation and azimuth and receiver position inside the building). Task 3: analyse the results of the simulations and develop a statistical propagation model for the satellite to indoor channel. Deliverables: The expected deliverable is a statistical propagation model for the satellite to indoor propagation channel at L and S bands. (SW IPR to ESA for operational activities (TBC)) Current TRL: TRL1 Target TRL: TRL2 Application Need/Date: SW operational by 2009 Mobile Satellite Telecommunication Application/Mission: Contract Duration: 18 months systems SW Clause : - Dossier0 Ref.: T-46 Consistency with Harmonisation Roadmap and Conclusions: Page 109 of 227
TRP Work Plan 2005-2007 Description of Activities TEC-SB/7935/dc 12/Feb/09 5.5 - Navigation & Positioning TRP Reference: Title: T504-02EM Energetic Electron Environment Models for MEO New models will be constructed to take into account the temporal, spatial and spectral variations in electron fluxes at altitudes and inclinations relevant for Galileo. The NASA AE-8 model that is traditionally used for the electron flux predictions in the radiation belt environment is static, based on data collected in the 1960s and 70s, and hence badly outdated. New models taking into account the dynamic nature of the outer electron belt are therefore needed. The aim of this activity is to produce such models utilising data from the ESA Standard Radiation Environment Monitor (SREM) instruments flying on Integral, PROBA-1 and the GSTB-V2. Electron measurements from other radiation monitors, including DoubleStar shall also be included, where applicable, utilising past ESA-sponsored data base developments, together with other observations and theoretical considerations. The models shall be WWW-based, and readily available for implementation in the SPENVIS system. Interfacing to Geant4-based software for radiation and charging effects analyses shall also be considered. Deliverables: WWW-based electron environment models for MEO orbits. These shall take into account the temporal, spatial and spectral variations in electron fluxes at altitudes and inclinations relevant for Galileo. Current TRL: TRL1 Target TRL: TRL3 Application Need/Date: SW operational by 2008 Application/Mission: Navigation/Telecom Contract Duration: 24 months SW Clause : Operational SW Dossier0 Ref.: T-8033 Consistency with Harmonisation Roadmap and Conclusions: TRP Reference: T504-05GN Satellite and station clock modelling for GNSS, link between physical models and Title: estimation / prediction processes The data transmitted by navigation satellites (GPS, Glonass, Galileo) include so-called pseudo-range measurements, which arise from a multiplication of the signal travel time and the velocity of light. The travel time is computed as the difference between time stamps at signal transmission by the spacecraft and signal reception by the (ground or low-earth orbiting) receiver. These time stamps are generated by two independently running clocks. For all applications of the data, whether real-time navigation or post-processed geodetic use, the relative offsets between these clocks, or both offsets to a common reference time, need to be known with a high precision. The clock offset estimation process is based on an epoch-by-epoch estimation of all clock offsets, not taking into account the physical behaviour of clocks. The clear advantage of this approach is that the process is insensitive to the erratic behaviour of some clocks, and indeed this method can be used successfully in the presence of the deliberate degradation of GPS signals known as Selective Availability. The disadvantage is that some valuable information is not used in the estimation process, namely that there are some highly stable clocks in the system, with known statistical properties. The proposed study should investigate which models of clock behaviour are available and how they can be implemented in the orbit and clock estimation systems currently used and under development at TOS-GN. The algorithms to be implemented should allow the user to select clock modelling as an option, and also allow a combination of the traditional epoch-by-epoch estimation process with the use of clock models. Deliverables: Model and documentation. Current TRL: TRL2 Target TRL: TRL3 Application Need/Date: TRL5 by 2008 Application/Mission: GNSS Contract Duration: 18 months SW Clause : - Dossier0 Ref.: T-7943 Consistency with Harmonisation Roadmap and Conclusions: Page 110 of 227
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