Publication Date: 04-MAR-19

Program ref.: Technology Developme
Tender Type: C
Tender Status: INTENDED
Price Range: 200-500 KEURO
Budget Ref.: E/0901-01 - Technology Developme
Proc. Prop.: NO
Establishment: ESTEC
Directorate: Directorate of Tech, Eng. & Quality
Department: Electrical Department
Division: RF Payloads & Technology Division
Responsible: Floury, Nicolas
Products: Ground Segment / Development and Construction of Space Segment / General Support / Other
Techology Domains: Electromagnetic Technologies and Techniques / Wave Interaction and Propagation / Wave Propagation
Flight Dynamics and GNSS / GNSS High-Precision Data Processing / GNSS and Geodetic Data Processing
Industrial Policy Measure: N/A - Not apply

GNSS users seek better position estimates; this means high precision and shorter times to achieve low error positions. In addition,the number of GNSS receivers, both single or multi-frequency and/or multi-constellation are growing and an increasing number of applications and services rely on these estimates. In this framework, the development of the Fast Precise Point Position and similar algorithms seem to cover the need for faster (low convergence time) and more precise position estimates in Real-Time (RT). The key feature of this technology is the distribution of precise information to the user. Among this information are the ionospheric corrections, which need to be precise and well bounded, to be able to add information on the positioning calculation. However, at the presentthere is not a clear model and message to be sent to the user ESA real time Inospheric Continental Caster (e-RTICC) enables high accuracy navigation especially in regions where there are high ionospheric gradients, for single and multi-frequency -mostly Dual-Frequency- users. It could lead to reduction of ground segment cost. This activity focuses on the implementation of a 3D High Precision Ionospheric correction RT caster tool; that allows assessing different RT computation strategies for various geographic locations, network sizes and different ionospheric messages to achieve high accuracy ionospheric estimates. This activity encompasses the following tasks: - Study of RT high precision 3D ionosphere models. Including trade-off of temporal sampling and geographical information regarding the message structure vs. Precision, computation load, need for interpolation. Selection of the most suitable candidate tobeimplemented in RT. - Selection and development of suitable algorithms to perform RT Ambiguity fixing for ionospheric computationwith at least GPS and Galileo. - Selection and development of RT ionospheric messages for High Accuracy estimation, accounting for terrestrial broadcast (i.e. 5G) or GEO/MEO satellites. - Design of a modular e-RTICC, in order to allow the maintenance and expandability of the tool. In general terms should be: data stream input, pre-processing of data, ambiguity fixing, ionosphere correction calculation, interpolation (if needed), message generation, message broadcasting. - Implementation of the e-RTICC. - RT campaigns. Study of the e-RTICC accuracy in the position domain with respect to network size and user location. Study for Mid-Latitudes (Europe) and Low-Latitudes (South America). Recommendations over those regions.

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