This report summarizes FOI´s research during 2002 on Reconnaissance and Surveillance incl Low Observables. The research comprise sensor systems (radar, IR, laser, acoustics), signal processing, data fusion, low observables and materials for signature reduction. Activities in the radar domain includes an experimental system (<1 GHz) and algorithms for GMTI. Components and signal processing methods have been studied for digital beamforming antennas. Target recognition based on combination of passive and active EO-sensors and 3 D imaging by laser have been demonstrated. An architecture based on intelligent agents have been used in modeling and simulation of a ground sensor network. An information system and a query language to support target recognition has been developed. Research on low observables has resulted in new models that are taking into account interaction between target and background. A model for the influence of aerosols on EM-propagation has been developed. Research on signature materials include: radar absorbants based frequency selective components, surface coatings for reduction of IR emissivity.