The aim of the MEOLUT Project is to find a possible solutions for an antenna sub-system and front-end for the Local User Terminal (MEOLUT) on GALILEO satellites.

Basic module properties of MEOLUT project, developed by TTI for SAR applications

The MEOLUT antenna and front-end sub-systems have to be able to receive SAR signals simultaneously from at least four MEO GALILEO satellites and to transfer those signals to the MEOLUT processor. Also, the system has to be design flexibly by means that in the future can be expanded to reception of larger number of satellites. Nowadays, the existing solution is based on parabolic reflectors which are not able to perform the wide-angle coverage and efficient hand-over. In this case of multiple satellite-tracking, minimum required numbers of these antennas is greater than number of tracked satellites.

The alternative approach to the MEOLUT terminal antenna in this project is related with employment of non-planar antenna arrays. According to the required coverage for the MEOLUT terminal can be concluded that natural form for synthesis of antenna array, for this particular application, is spherical array. A solution of adequate spherical distribution of radiating elements can be found in geodesic domes. Dome will be composed by several basic triangles, keeping the antenna architecture locally planar. This basic triangle will be designed, developed, and validated among the MEOLUT project.


Spherical antenna arrays used by TTI for developing of a basic Active Array module for Meolut Application

TTI role:
TTI is responsible of designing and developing the Basic triangle, the radiating elements, the RF-front and the DBF (Digital Beam Forming), as well as integrating the different parts of the module. TTI will validate the final prototype and will coordinate the project.