A Method for Performance Enhancement for Aeronautical Telemetry Radio Link Using Alamouti Code

Sh. Marzban; K. Mohamed-Pour

Volume 3, Issue 2 , January 2011, Pages 1-9

Abstract
  In the most aeronautical telemetry systems, at least two antennas are used to transmit radio signals towards receiver antenna. It is due to effect of large metallic fuselage of air vehicles in cutoff radio link between transmitter and receiver antenna during flight manoeuvres. Installation of two antennas ...  Read More

Multidisciplinary Conceptual Design Optimization of Monopropellant Propulsion System of Nanosatellite

M. Nosratollahi; A. h. Adami-Dehkordi

Volume 3, Issue 2 , January 2011, Pages 11-22

Abstract
  This paper presents the multidisciplinary design optimization of monopropellant propulsion system of the nanosatellite for planner maneuver. Mass, configuration and internal ballistic equations are derived for any part of propulsion system (thruster, tank, pressurized gas, ...). Minimizing total mass ...  Read More

Design and Manufacturing a Laboratory Example of Pulsed Plasma Thruster

A. Rezaiha; M. Anbarloi; M. Farshchi

Volume 3, Issue 2 , January 2011, Pages 23-30

Abstract
  Although Pulsed Plasma Thruster (PPT) has first been utilized in a space mission in 1964 but after more than four decades, it is still a space rated technology which has performed various propulsion tasks from stationkeeping tasks to three-axis attitude control for a variety of former missions. With ...  Read More

Dynamic Simulation of Propellant Utilization System in Propellant Tanks of a Liquid Propellant Engine

M. Naderi Tabrizi; S. A. R. Jalali Chimeh; H. Karimi

Volume 3, Issue 2 , January 2011, Pages 31-43

Abstract
  In this article the Propellant Utilization system (PU) has been simulated. The objective of this system is to adjust the consumption ratio of the propellants in order to ensure the minimum propellant residuals at engine’s shutdown phase. Using the PU system, the orbital or range and also the payload ...  Read More

Modeling and Simulating the Earth’s Magnetic Field Utilizing the 10th Generation of IGRF and Comparison the Linear and Nonlinear Transformation in order to Use in Satellite Attitude Control

M. Navabi; N. Nasiri

Volume 3, Issue 2 , January 2011, Pages 45-52

Abstract
  Since last decades utilizing satellites in low earth orbits have had increasing tendency. These satellites experience the earth magnetic field due to their low altitude to the earth. The Earth magnetic intensity can be used in order to control the attitude of spacecraft utilizing the interaction between ...  Read More

Studying of Effect of Regularization and Change of Independent Variable on the Solution of Perturbed 2BP

M. Jafari Nadoushan; M. Tivay

Volume 3, Issue 2 , January 2011, Pages 53-58

Abstract
  Effect of regularization on the solution of perturbed two body problem is investigated in this paper. Purposes of using this method are computational burden reduction and achieving desirable accuracy in the minimum time. In this regard the equations of motion are linearized and independent variable is ...  Read More

کاربرد مدل پاندول ساده به منظور اعمال دینامیک تلاطم سیال در شبیه‌سازی شش درجه آزادی پرواز ماهواره‌بر

E. Amani; M. Ebrahimi; J. Roshanian

Volume 3, Issue 2 , January 2011, Pages 59-67

Abstract
  در این مقاله، معادلات کوپل‌شده جسم صلب- تلاطم سیال- الاستیسیته برای پرواز شش درجه آزادی ماهواره‌برها توسعه داده شده است. معادلات حرکت به کمک معادلات لاگرانژ در دستگاه ...  Read More

هدایت بهینه بر خط بازگشت به زمین از طریق بسط مجانبی هماهنگ

M. Mortazavi; D. Abbasi-Moghadam

Volume 3, Issue 2 , January 2011, Pages 69-76

Abstract
  هدف اصلی مقاله حاضر، هدایت بهینه و برخط اجسام بازگشتی به زمین است. روند دستیابی به این مهم مبتنی بر روش بسط مجانبی هماهنگ است که یکی از روش‌های خانوادة اغتشاشات تکین است ...  Read More