Optimal Coupled Spacecraft Rendezvous and Docking Using Gauss Pseudospectral Method and Step by Step Linearization

S. H. Pourtakdoust; R. Moradi; R. Kamyar

Volume 2, Issue 2 , July 2009, Pages 1-16

Abstract
  In this work the coupled nonlinear problem of optimal spacecraft rendezvous and docking (RVD) is addressed. In most of the previous studies on the subject of optimal RVD, decoupling is presumed to exist between the trajectory translational and the attitude motions and hence the optimal coupled analysis ...  Read More

Design of an Attitude Estimation Algorithm for a LEO Satellite Based on Multiple Models Adaptive Method and Comparison with EKF

H. Bolandi; F. Fani-Saberi

Volume 2, Issue 2 , July 2009, Pages 17-26

Abstract
  In this paper, a novel and highly accurate attitude estimation method for a LEO satellite is designed. The method is based on multiple model adaptive estimation (MMAE) structure. In this method, the satellite dynamic equation is linearized in a few points in order to increase the computational rate compared ...  Read More

An Adaptive Method for Star Extraction from Digital Astronomical Images

M. A. Sharifi; F. Samadzadegan; Saeed Saeed Farzaneh

Volume 2, Issue 2 , July 2009, Pages 27-38

Abstract
  Celestial positioning has been used for navigation purposes for many years. Stars as the extra-terrestrial benchmarks provide unique opportunity in absolute point positioning. However, astronomical field data acquisition and data processing of the collected data is very time-consuming. The advent of ...  Read More

Evaluation of the Impacts of Orbit Parameters Change on Specifications and Performance of Power Sources of LEO Satellites

O. Shekoofa; M. Taherbane

Volume 2, Issue 2 , July 2009, Pages 39-49

Abstract
  This paper intends to study the impacts of orbit parameters change and evaluate their importance in Electrical Power Subsystem (EPS) design. Two main objectives have been followed in this research: 1) understanding the impacts of the orbital parameters change and the mechanisms of their interactions ...  Read More

Constrained Optimization of Launch Vehicle Trajectory Using Spline and Bezier Curves

A. Tavakoli; M. Nikusokhan; J. Roshanian; M. Mirshams

Volume 2, Issue 2 , July 2009, Pages 51-60

Abstract
  Design of launch vehicle (LV) trajectory is among the problems in which the use of optimization is of high significance. Implementing optimization using optimal control problem leads to a two point boundary value problem (TPBVS) that can be solved only numerically. On the other hand, development of optimal ...  Read More

Design and Manufacturing Steps of a Satellite Reaction Wheel

S.H. Miri Roknabadi; M. Mirshams; A. A. Nikkhah

Volume 2, Issue 2 , July 2009, Pages 61-68

Abstract
  This paper presents a technical note of mathematic model, design and manufacturing steps of a Reaction Wheel, one of the most important active actuators of satellite. After that Reaction Wheels are tested for the satellite simulator of K.N.Toosi University of Technology, Iran. There were some requirements ...  Read More

Modeling and Evaluation of Reliability in Rocket Engine by Fault Tree Analysis

M. Karbasian; A. Bagheri

Volume 2, Issue 2 , July 2009, Pages 69-73

Abstract
  Recognition of any type of failures in systems and prediction of its reliability have important role in improvement of design of systems. Fault Tree Analysis (FTA) is one of the best techniques in analysis and improvement of complex systems. In this paper first, we show reliability block diagram (RBD) ...  Read More

Flight Path Angle Steering with Lambert Guidance Reference

R Zardashti; M Bagherian

Volume 2, Issue 2 , July 2009, Pages 75-79

Abstract
  In this paper a new guidance technique for ballistic missiles and launch vehicles is proposed. Generally the Lambert guidance is used to generate missile nominal (correlated) parameters through powered flight to put it in a ballistic flight path. Because of uncertainties and undesired factors, the nominal ...  Read More