SEU Rate and Reliability Analysis in LEO Satellites

Reza Omidi Gosheblagh; Karim Mohammadi

Volume 5, Issue 3 , October 2012, Pages 1-9

Abstract
  Due to high design and launch cost of satellites, their failure probability should be minimized. Single Event Effects (SEUs) are one of the most common error sources in satellite microelectronic. To cope with these unwanted errors, various techniques are used. The reliability analysis of these methods ...  Read More

Integrated Inertial Navigation with Positioning System for Increasing Orbital Module Navigation Accuracy

Mahdi Jafari; Arash Sangary; Jafar Roshanyan

Volume 5, Issue 3 , October 2012, Pages 11-19

Abstract
  The Inertial navigation system is an ideal solution for motion detection with high accuracy with fast dynamics, but the precise location and status of the system output can be significantly reduced over time. On the other hand, global positioning system is able to determine its position with an average ...  Read More

Improvement of Bit Error Rate (BER) in Telemetry Radio Link of Satellite LEO Using MIMO Technique

Shahrokh Marzban; Kamal Mohamedpour; Somye Pirzadi

Volume 5, Issue 3 , October 2012, Pages 21-31

Abstract
  After setteling the LEO satellite in the given circuit, the ground station needs to communicate with it for the received of information and control of its subsystems. Due to the fact that satellite communication channels are influenced by shadowing conditions, if a line of sight (LOS) signal exists between ...  Read More

GPS Signal Simulation in Intermediate Frequency (IF)

Shervin Amiri; Mohammad Ali Dalir; Hossein Talaiee

Volume 5, Issue 3 , October 2012, Pages 33-40

Abstract
  The NAVSTAR Global Positioning System (GPS) is a satellite-based navigation and positioning system which includes a constellation of 32 satellites, remote control stations and its receivers and can be used for determination the geographical positions of its users. GPS signal simulator needs for test ...  Read More

Design a Model of Four Color Separation Prism in Satellite Camera

Atefe Ajami; Siyamak Naseri; Davood Hashemi; Mahboube Arabsorkhi

Volume 5, Issue 3 , October 2012, Pages 41-48

Abstract
  In this paper, in order to separate images in four spectral bands (from blue to near infrared) in multispectral cameras, four-color separation prism advantagesarereviewed. Then, while description of ray tracing of four-color separation prism, main design parameters and principlesarementioned.After that, ...  Read More

GPS-RTK Integrated with Micro-Electro Mechanical INS for Precise Application

Jamal Asgari; Ali Reza Amiri -Simkooei; Farzane Zanganeh-nejad

Volume 5, Issue 3 , October 2012, Pages 49-57

Abstract
  Inertial Navigation System (INS) and Global Positioning System (GPS), are used in various navigation and positioning applications. Because each of the INS and GPS technologies has some limitations and advantages, during last two decades, the systems integration has been widely used for accurate and reliable ...  Read More

Space Application of a Linear Array of Plasma Antenna

Fateme Sadeghikia; Farokh HojatKashani; Jalil RashedMohasal; S. Javad Giyome- Bozorgi

Volume 5, Issue 3 , October 2012, Pages 59-66

Abstract
  Numerical investigation has been made on a linear array of surface wave driven plasma monopole antenna using finite difference time domain simulation. Variations of the excitation power can be used for construction of a dynamically reconfigurable antenna. Plasma elements in the nominal pressure of 0.4 ...  Read More

Specific Grain Analysis and Rapid Internal Ballistic Simulation for Solid Motor

MohammadReza Heidari; AmirHoseyn Adami

Volume 5, Issue 3 , October 2012, Pages 67-80

Abstract
  In this paper, specific grains burn back is presented by new geometrical method. The software is developed for Wagon wheel grains and 3D grains. Rapid solid motor ballistic simulation code produces required charts with considered nozzle geometry. Presented method used geometrical introducer point (GIP) ...  Read More