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• W115439133 abstract "The great potential benefits associated with SFF (satellite formation flying) have led toconsiderable research in this concept around the world. As it is a new field of research and theimplementation of formation flying in practice brings some inherent challenges and risks It istherefore particularly useful to develop a real time platform, where formation flying theories,technologies, algorithms and their coordination in open and close loop can be tested inscenarios close to those actually expected.In this research a low cost, real time hardware in the loop (RTHIL) test bed for lowearth orbit autonomous SFF consisting of nano satellites has been developed which canintegrate original hardware in the close or open loop. The proposed real time close loop testbed consists of a real time SFF model, a real time relative navigation system, guidance andcontrol algorithm, and GPS simulator.Different SFF models already developed by researchers have been studied for theirpotential use in a real time test bed. Due to the limitations associated with them a novel realtime SFF model and algorithm has been developed for real time hardware in the loop test bed.This real time SFF model was downloaded to a setup of two single board real time computersconnected to each other through a serial port.The hardware of the relative navigation system has been designed and developed in thisresearch. Single frequency GPS has been used as the relative navigation sensor. A model hasbeen developed to estimate the dynamic characteristics of the GPS receiver for LEO orbits.This model simulates the relative dynamics of the GPS constellation and the LEO satellite.S3C2410 has been selected as the navigation processor. Radio transceivers are used toexchange data between the satellites. A uC/OS-II real time operating system is used in thenavigation software code. The Hardware and software structure has been developed tosimulate both centralized and decentralized approaches. A novel relative navigation algorithmis discussed.A Graphical Interface Software (GIS) has also been developed to initialize hardware andsoftware prior any simulation and test run. It synchronizes the start of simulation on all realtime computers, relative navigation systems and other components/simulator. It captures realtime data from the deputy satellite. It also provides different debug and test options.Offline simulations were run for three models Hill’s, COEPOKE and RTSFF models byconsidering gravitational and atmospheric perturbation. The comparison of the results showedthat the RTSFF model is able to simulate formations both in circular and elliptical orbitssatisfactorily. The analysis of these models on the basis of their mathematical derivationsshowed that the RTSFF model gives better results than other models. The worth of this modelfor the real time test bed has been shown by running real time simulations onto a network oftwo synchronized single board real time computers and when the results were compared withoffline simulation results they were found to be quite satisfactory.The hardware of the relative navigation system has been checked and tested. A basicinfrastructure for navigation software has been developed. Different open loop tests have beenrun to verify the working of the hardware and software and these have verified the correctfunctioning of the system. The navigation algorithm could not be implemented in theembedded environment, Due to the unavailability of GPS simulator, no close loop simulationor test has been performed. The functionality of all the software, models, hardware and theiroperational control under GIS software has been checked in real time environment and foundto be working correctly and are ready to be run in any open loop or closed loop simulationtest." @default.
• W115439133 created "2016-06-24" @default.
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• W115439133 date "2008-06-01" @default.
• W115439133 modified "2023-09-24" @default.
• W115439133 title "Real time hardware in the loop simulation testbed of spacecraft formation flying" @default.
• W115439133 hasPublicationYear "2008" @default.
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