This report provides a comprehensive summary of the horizon scanning performed by FOI in 2017. The aim of this activity was to identify research advances that may be particularly relevant for the Swedish armed forces, and to increase FOI's overall knowledge of the six topics studied. For each topic a literature survey was conducted to evaluate its status and relevance. A brief description of the studies carried out in 2017 is given below. The study on System-of-systems engineering made a survey of theoretical and methodological frameworks for development of systems-of-systems. The study showed that the "system-of-system" concept is not well-defined, but there are some theoretical frameworks and attempts to systematically study the topic have been made. Track before detect enables early target detection and tracking based on weak signals/ signatures. This technology analyses raw sensor data rather than preprocessed data which is the traditional way to analyse radar and sonar data. The study identified three possible applications. There is a need for high-precision positioning for underwater systems, where positioning with precision similar to that obtainable using GPS but without being close to the water surface is needed. The study on Underwater navigation identified a set of possible techniques that are independent of GPS and similar systems. Discussions of security for satellite systems have usually concerned physical threats, but more recent discussions have also included cyber-based threats against satellites and ground stations. The study on Cyber security in the space domain has summarised the literature and identified weaknesses in technical security and deficiencies in the international legal system. Rapid field identification of harmful microorganisms is important from a military and societal security perspective. There is a need for generic assays that cover a large part of the biological risk spectrum and a need for rapid on-site detection. The study describes a set of techniques that are under development and concludes that combinations of techniques are needed to achieve fast and broad-spectrum bio-detection. The study on Energetic materials with new structures investigated how nano technology can be used to decrease the impact sensitivity of energetic materials. Recent studies indicate that impact sensitivity decreases with decreasing particle size. Our conclusion is that this hypothesis needs to be statistically validated.