Line of Sight Rate Estimation Using Discrete-Time Sliding Mode Extended State Observer

Document Type : Dynamics, Vibrations, and Control

Authors

1 MSc Student, Faculty of Control, Malek Ashtar University of Technology, Tehran, Iran

2 Associate Professor, Faculty of Control, Malek Ashtar University of Technology, Tehran, Iran

3 Corresponding author: Assistant Professor, Faculty of Control, Malek Ashtar University of Technology, Tehran, Iran

4 Assistant Professor, Faculty of Control, Malek Ashtar University of Technology, Tehran, Iran

Abstract

Proportional Navigation is commonly used in the terminal phase of homing missiles. To implement this guidance law, it is necessary to measure or calculate Line of Sight (LOS) rate. It is usually necessary to use gimballed seekers to measure the LOS rate. However, if the system is equipped with a strapdown seeker, the LOS rate must be calculated from derivation or estimation methods. Because the signal measured by seekers usually contains noise, so deriving this signal requires a low pass filter that will cause the behavior changes in the measured variable. The issue in this paper is the design of a discrete time sliding mode extended state observer to estimate the LOS rate and evaluate it in the guidance loop. This is done by performing computer simulations. Implementing continuous time observers in processors has challenges such as sampling time selection and it is better to design the observer in discrete time form from the beginning so that its implementation issues can be considered from the design level and in computer simulations.

Keywords

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References

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Aerospace Mechanics
Volume 18, Issue 2 - Serial Number 68
Serial No. 68, Summer Quarterly
August 2022
Pages 51-66

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History

  • Receive Date: 03 June 2021
  • Revise Date: 22 November 2021
  • Accept Date: 22 January 2022
  • Publish Date: 23 July 2022

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