Home FocusCloseAp Collision Risk Assessment Tool. Print Download brochure General Information Flight dynamics for LEO/MEO satellites FocusCloseAp automatically downloads NORAD two-line element information from the internet, and, in combination with the FocusSuite family of products, generates orbit and maneuver data for a selected set of satellites and calculates several levels of close approach warnings. More detailed data and plots are produced as the approach becomes more of a concern. The advanced scheduling features of FocusCloseAp enable all processing to be performed both automatically and regularly with minimal user interaction and users are notified of the program result. Contact Us Highlights Unlimited automation of lights-out operations. Adapted to each client's needs. Features Risk Assessment Key Functions Using orbital information, FocusCloseAp detects approaches between the satellite and external objects. If a close conjunction is detected, collision avoidance maneuvers can be calculated. Support for large fleets of satellites is available with integrated input forms and reports, as well as optimized calculations. Orbital Information Orbital information from: Target satellite: operational orbit. External objects: two-line elements (TLEs) downloaded from the internet, propagated with SGP and a proprietary algorithm to increase precision. Catalog Filtering Catalog filtering is a CPU-intensive task (thousands of objects are considered and propagated). First, focusCloseAp applies the classic apogee-perigee filter, which is the most efficient. Then, it applies a smart filter to exclude all remaining objects that cannot produce a close conjunction at the time of the analysis. A precise root finder is used to calculate the exact moment of the closest approach.