An algorithm is developed for estimating the motion (relative attitude and relative position) of large pieces of space debris, such as failed satellite. The algorithm is designed to be used by a debris removal space robot which would perform six degreeof-freedom motion control (control its position and attitude simultaneously). The information required as feedback signals for such a controller ...

This paper aims to investigate the iterative process of the satellite terminal application development, while adapting the user centered development and prototyping approach. This master thesis was carried out with the express purpose of developing an intuitive and user friendly hardware simulator of a satellite terminal while investigating its efficiency as such. The simulator is to be used as...

Many planned Earth observation satellite missions use distributed satellite systems in constellation or cluster orbits instead of one, large satellite with many instruments. This network of satellites and ground stations allows data to be efficiently downlinked. However, to create a networking protocol for constellations of small Earth observing satellites, several limitations need to be addres...

A versatile GNSS signal simulation tool for time-domain simulations at sample-level with a focus on wave propagation effects, such as multipath or atmospheric disturbances, is introduced. The Satellite Navigation Radio Channel Signal Simulator (SNACS) uses a modular, object-oriented approach implemented in C++. The application is thoroughly designed in a multi-threaded way to provide highly acc...

in our country, student transportations’ security and driving accidents statistics for students is one of the major concerns for relevant organizations such as educational organization. in current year, a system, was named sepand, was formed in city taxi driver :::::::union::::::: by educational organization, naja traffic and city taxi driver :::::::union:::::::. in this systems’ plan, basis on...

This paper discusses the balancing of a groundbased satellite simulator. The simulator uses an air bearing as the primary method for the emulation of the frictionless environment of space. Of particular concern for accurate simulation is system balancing. 'Balancing' refers to the process of moving the center ofmass(CM) of the simulator near to the center of rotation(CR) of the air-bearing to r...

In the present work a new concept of satellite-based navigation system, which does not require on-board atomic references, is presented. This novel concept consists of a constellation of compact low-earth orbit positioning satellites that are equipped with on-board steerable clocks, i.e. voltage controlled crystal oscillator (VCXO). An appropriate ground-satellite synchronization network is res...

This paper proposes the use of congestion pricing for achieving relative service differentiation in satellite IP networks. The idea is to use congestion pricing as an effective approach to control traffic rate for Transmission Control Protocol (TCP) flows, with Explicit Congestion Notification as a congestion feedback mechanism, by taking into account network users’ willingness-to-pay. With mul...