Space subsystems design: (navigation, control, structure and…)
Kinematic Modelling Without Singularity and Nonlinear Control of Satellite Attitude Using Direct Adaptive and Fuzzy PD Control Methods

M. Navabi; Nazanin Safaei Hashekvaei

Volume 14, Issue 2 , June 2021, , Pages 77-88

Abstract
  Adaptive control technique is taken into consideration because of overcoming the problem of existence of uncertainties in the space missions. In this paper, a novel optimal direct adaptive control technique which is based on Markov parameters is presented. In this technique, the system's performance ...  Read More

Static Analysis of Pulse-Width Pulse-Frequency Modulator Based on Analytical and Numerical Solutions

S.Hamid Jalali-Naini

Volume 11, Issue 1 , June 2018, , Pages 13-29

Abstract
  In this study, the preferred regions of Pulse-Width Pulse-Frequency Modulator (PWPFM) are obtained analytically for the static analysis. For this purpose, a comprehensive parametric study is carried out based on the two performance indices of fuel consumption and the number of thruster firings. The preferred ...  Read More