Formation Flying Testbed at DLR's German Space Operations Center (GSOC)

摘要: This paper describes the Formation Flying Testbed (FFTB) developed by German Space Operations Center (DLR/GSOC) and presents key results from its usage in frame of formation flying missions currently operated at GSOC. The FFTB constitutes a mission-independent framework for design, implementation, rapid prototyping, testing validation advanced guidance navigation control (GNC) systems multi-satellite missions. It is intended to support all phases during lifetime GNC system, preliminary design system functional performance verification post-facto analysis mission operations. realization takes advantage achievements experience gained development activities some pioneers autonomous like PRISMA TanDEM-X. In particular DLR’s contributions these have been validated making use described this paper. complete project implemented Matlab/Simulink environment, which offers model-based capabilities, user-friendly interface, high modularity, well-known among aerospace community. applications interest can be executed on different platforms fully consistent manner. As illustrated allows seamless transition between offline simulations using flight data real-time hardware-in-the-loop tests comprising real GPS receivers 2x12 channels Spirent GSS7700 signal simulator. Furthermore application ported Real Time Executive Multiprocessor Systems (RTEMS) environment LEON-3 FPGA board, representative spaceborne onboard processors. demonstration versatility, has recently integrated with European Proximity simulator (EPOS 2.0) enable algorithms rendezvous docking. shown TanDEM-X missions, used reliably verify behavior on-board software in-orbit. case orbit attitude propagation functionalities as well sensors actuators emulators are simply substituted Simulink functions able read telemetry stream. Since fed same inputs received orbit, tuning algorithms. Finally retrieved ongoing give possibility cross-validate emulator FFTB. To end observations compared simulated produced models employed