This report presents the two main goals for this project. One is to develop methods, tools, models and algorithms for high quality simulation of multi sensor systems (radar, IR and 3D-laser radar) in synthetic environments. The resulting HLA-based simulation system handles multiple sensors, multi sensor tracking and sensor control in a scenario with realistic physical models of targets and backgrounds in current wavebands. The other main goal for this project is to specify sensors for a stealth UCAV-concept for combating moving ground targets, and assessment of its performance in the simulation system. As the UCAV shall have allweather capability and fast search capability of large areas, we have chosen an LPI-radar (noise radar) with SAR capability. It is designed to have such a low signature as to be impossible to detect with present operative radar warning systems. It is used for target detection and aiming the EO-sensors at the targets for classification and recognition. We have also developed algorithms and methods for assessment of the theoretical performance limits of estimating target parameters for the IR-sensor. The stealth capability of the UCAV-concept makes it possible for the UCAV to approach the targets without being detected by any radar warning system, which should improve the strike probability.