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This paper will introduce and describe the goals, concept and overall approach of the European 7th Framework Programme's project named CLOSE-SEARCH, which stands for 'Accurate and safe EGNOS-SoL Navigation for UAV-based low-cost SAR operations'.  The goal of CLOSE-SEARCH is to integrate in a helicopter-type unmanned aerial vehicle, a thermal imaging sensor and a multi-sensornavigation system (based on the use of a Barometric Altimeter (BA), a Magnetometer (MAGN), a Redundant Inertial NavigationSystem (RINS) and an EGNOS-enabled GNSS receiver) with an Autonomous Integrity Monitoring (AIM) capability, to support thesearch component of Search-And-Rescue operations in remote, difficult-to-access areas and/or in time critical situations. The proposedintegration will result in a hardware and software prototype that will demonstrate an end-to-end functionality, that is to fly in patternsover a region of interest (possibly inaccessible) during day or night and also under adverse weather conditions and locate there disastersurvivors or lost people through the detection of the body heat.  This paper will identify the technical challenges of the proposed approach, from navigating with a BA/MAGN/RINS/GNSS-EGNOSbasedintegrated system to the interpretation of thermal images for person identification. Moreover, the AIM approach will be describedtogether with the proposed integrity requirements. Finally, this paper will show some results obtained in the project during the first testcampaign performed on November 2010. On that day, a prototype was flown in three different missions to assess its high-level performanceand to observe some fundamental mission parameters as the optimal flying height and flying speed to enable body recognition.The second test campaign is scheduled for the end of 2011

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

EGNOS-BASED MULTI-SENSOR ACCURATE AND RELIABLE NAVIGATION IN SEARCH-AND-RESCUE MISSIONS WITH UAVS