scholarly journals Long-distance Formation Flying of Spacecraft in Elliptic Orbits

2016 ◽  
Vol 14 (ists30) ◽  
pp. Pd_143-Pd_149
Author(s):  
Makoto SUMINAKA ◽  
Masaya KIMURA ◽  
Katsuhiko YAMADA
Keyword(s):  
Formation Flying ◽  
Long Distance ◽  
Elliptic Orbits

scholarly journals СОВРЕМЕННЫЕ ЗАДАЧИ СОЗДАНИЯ И УВОДА С ОРБИТЫ ГРУППИРОВОК КОСМИЧЕСКИХ АППАРАТОВ КЛАССА НАНО И ПИКО

2018 ◽  
pp. 20-35
Author(s):  
Эрик Александрович Лапханов ◽  
Александр Сергеевич Палий
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Formation Flying ◽  
Long Distance ◽  
Rocket Fuel ◽  
Effective Work ◽  
Satellite Systems ◽  
Magnetic Devices ◽  
Distributed Satellite ◽  
Carrier Rocket

The purpose of the present paper is the analysis of current tasks concerning with creation and deorbiting of the formation flying groups consist of nano- and picosatellites and the consideration of the possibility of using permanent magnet devices for the deorbiting of these groups. During research was determined that it is most expedient to use small standardized spacecraft and use them during the development of distributed satellite systems. It can be both formations, and groups of satellites spaced a long distance. The analysis of the current possibilities for the removal of nano- and pico- spacecraft into orbit is carried out. According to the characteristics and properties of super-small spacecraft because of their super-small size and saving of the rocket fuel, it was determined that these spacecrafts proposed to be launch as a passing payload when large, expensive spacecraft is launched into orbit.  To facilitate the integration of spacecrafts such as CubeSats with a carrier rocket, special multi-purpose dispensers were developed. The problems of controlling the configuration of the nano- and pico- satellites formations are shown. The analysis of deorbiting technologies of spacecrafts of the nano- and pico- satellites is carried out. The overview of modern well-known propulsion technologies of nano- and pico- satellites is carried out. The new method of creation and deorbiting of the formation flying groups from nano- and pico- satellites with using new constructive scheme “spherical dispensers” was proposed. The main axes of P-PODs are located along the radiuses of “spherical dispenser”. The technology of deploying and “clotting “of the formation flying groups from nano- and pico- satellites with using tether connection and hoist devices was proposed. The analysis of the possibility of implementation of devices with permanent magnets for nano- and pico- satellites is carried out. The low boundaries of effective work of the magnetic devices were determined. An alternative method for deorbiting nano- and pico- spacecrafts with the help of devices with permanent magnets using “clotting “technology is proposed

Formation flying in elliptic orbits with theJ2perturbation

2012 ◽  
Vol 12 (11) ◽  
pp. 1563-1575
Author(s):  
Xi-Yun Hou ◽  
Yu-Hui Zhao ◽  
Lin Liu
Keyword(s):  
Formation Flying ◽  
Elliptic Orbits

Backstepping sliding mode control for formation flying spacecraft

2018 ◽  
Vol 90 (1) ◽  
pp. 56-64
Author(s):  
Yong Guo ◽  
Shen-Min Song ◽  
Xue-Hui Li
Keyword(s):  
Fuel Consumption ◽  
Finite Time ◽  
Formation Flying ◽  
Sliding Mode ◽  
Long Distance ◽  
External Disturbances ◽  
Content Type ◽  
Control Signals ◽  
Attitude Equilibrium ◽  
Formation Flying Spacecraft

Purpose This paper aims to investigate the problem of finite-time consensus tracking control without unwinding for formation flying spacecraft in the presence of external disturbances. Design/methodology/approach Two distributed finite-time controllers are developed using the backstepping sliding mode. The first robust controller can compensate for external disturbances with known bounds, and the second one can compensate for external disturbances with unknown bounds. Findings Because the controllers are designed on the basis of rotation matrix, which represents the set of attitudes both globally and uniquely, the system can overcome the drawback of unwinding, which results in extra fuel consumption. Through introducing a novel virtual angular velocity, exchange of control signals between neighboring spacecraft becomes unnecessary, and it is able to reduce the communication burden. Practical implications The two robust controllers can deal with unwinding that may result in fuel consumption by traveling a long distance before returning to a desired attitude when the closed-loop system is close to the desired attitude equilibrium. Originality/value Two finite-time controllers without unwinding are proposed for formation flying spacecraft by using backstepping sliding mode. Furthermore, exchange of control signals between neighboring spacecraft is unnecessary.

New State Transition Matrix for Formation Flying in J2-Perturbed Elliptic Orbits

2012 ◽  
Vol 35 (2) ◽  
pp. 536-547 ◽  
Author(s):  
Katsuhiko Yamada ◽  
Masaya Kimura ◽  
Takeya Shima ◽  
Shoji Yoshikawa
Keyword(s):  
Transition Matrix ◽  
Formation Flying ◽  
State Transition ◽  
State Transition Matrix ◽  
Elliptic Orbits

The Fine Structure of Phloem Cells

1985 ◽  
Vol 43 ◽  
pp. 632-635
Author(s):  
James Cronshaw
Keyword(s):  
Structural Studies ◽  
High Concentration ◽  
Long Distance ◽  
Phloem Tissue ◽  
Sieve Elements ◽  
Long Distance Transport ◽  
P Protein ◽  
Companion Cells ◽  
Electron Microscopical ◽  
Distance Transport

Long distance transport in plants takes place in phloem tissue which has characteristic cells, the sieve elements. At maturity these cells have sieve areas in their end walls with specialized perforations. They are associated with companion cells, parenchyma cells, and in some species, with transfer cells. The protoplast of the functioning sieve element contains a high concentration of sugar, and consequently a high hydrostatic pressure, which makes it extremely difficult to fix mature sieve elements for electron microscopical observation without the formation of surge artifacts. Despite many structural studies which have attempted to prevent surge artifacts, several features of mature sieve elements, such as the distribution of P-protein and the nature of the contents of the sieve area pores, remain controversial.

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