Egemen Imre's research while affiliated with Tübitak Uzay and other places

Publications (7)

Conference Paper
The purpose of a power subsystem is to ensure reliable delivery of electrical power compatible with all loads under all foreseeable operational states and environments, during all mission phases, and over the intended design life of the loads and of the space vehicle and the power subsystem is unarguably the most critical subsystem on a satellite....
Article
Full-text available
This paper presents a numerical method to propagate relative orbits. It can handle an arbitrary number of zonal and tesseral terms in the geopotential. This method relies on defining a relative Hamiltonian, which describes both the absolute and the relative motion of two satellites. The solution is separated into an analytical Keplerian part and a...
Article
Full-text available
In this paper, we explore the relative motion between two satellites on Keplerian orbits. We assume that the orbital elements defining the Keplerian ellipses for the two satellites are similar, so that we may neglect differences in these elements to second order. Analytic solutions for the relative motion are presented that conserve relevant quanti...
Article
An interplanetary small satellite mission is presented in this paper. The mission is to capture a series of images of a near earth object (NEO) and transmit them back to Earth. In this work, a full design and system description of the satellite is presented along with a simple outline of the mission and the expected imagery received. The aim of the...
Article
This paper presents a numerical method to propagate relative orbits which can handle up to an arbitrary number of zonal and tesseral geopotential terms and can be extended to accommodate the effects of atmospheric drag. This method relies on defining a 'relative Hamiltonian,' which describes both the absolute and the relative motion of two satellit...
Article
An increasing number of small satellites are proposed for miscellaneous applications, many of which assume the use of Global Positioning System (GPS) for positioning, timing and orbit determination. Some of these satellites are only a few kilograms in mass, which is the same mass as a typical space GPS receiver. Equally demanding are the requiremen...
Article
The Disaster Monitoring Constellation CDMC) is an international consortium, currently consisting of four remote-sensing satellites in a ‘string of pearls’ configuration in a sun-synchronous low Earth orbit. This paper examines the orbit acquisition problem for the DMC. A low-cost, accurate and practical solution utilising the natural dynamics for 3...

Citations

... For nano-and picosatellite navigation, a specialized miniature GPS and GNSS receivers have been developed, compatible with these satellite standards. The first small satellite GPS receivers were based on Plessey chipset [17]. The other possibility is to use a commercial RF front end and to program the signal processor to the FPGA. ...
... Because the NK/CPS method is numerical, the full Newtonian relative dynamics for all types of reference orbits can be used to obtain high-precision solutions. Recently, Hamiltonian mechanics have been applied to spacecraft formation flight to solve the TPBVPs [9,10], to derive analytic solutions [12], to compute the state transition matrix [23], and to perform the numerical relative orbit propagation [24]. The Hamiltonian modeling method provided by Guibout and Scheeres [9,10] adapts to all types of reference orbits, and it can incorporate all conservative perturbations. ...
... The analytical solution of equation 4 is derived by introducing the relative energy (HR) and relative angular momentum (LR) into the equation. (More explanation about the concept of relative energy and relative angular momentum can be found in the paper by Imre and Palmer [16]). As a result, fully analytical solutions to the in plane primer vector component are obtained in the forms: ...
... Yoshida [112] applied symplectic methods to study the motion of minor bodies in the solar system and the long-term evolution of outer planets. These methods came to the attention of the celestial mechanics [113] and dynamical astronomy [114] community in the early 1990s and have now become the benchmark in the study of orbit propagation [115], close encounters [116], asteroid [117,118] dynamics, cometary orbits [119,120], long-term formation flight dynamics [121] and N-body dynamics [109,122]. ...
... Microsatellites are now widely used for Earth observation [1,2] and scientific missions [3]. They are also considered promising for interplanetary flights [4,5]. Use of attitude control systems is crucial for most of the microsatellite missions. ...