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State Estimation for Landing Maneuver on High Performance Aircraft

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Abstract

State estimation methods are popular means for validating aerodynamic database on aircraft flight maneuver performance characteristics. In this work, the state estimation method during landing maneuver is explored for the first of its kind, using upper diagonal adaptive extended Kalman filter (UD-AEKF) with fuzzy based adaptive tunning of process noise matrix. The mathematical model for symmetrical landing maneuver consists of non-linear flight mechanics equation representing Aircraft longitudinal dynamics. The UD-AEKF algorithm is implemented in MATLAB environment and the states with bias is considered to be the initial conditions just prior to the flare. The measurement data is obtained from a non-linear 6 DOF pilot in loop simulation using FORTRAN. These simulated measurement data is additively mixed with process and measurement noises, which are used as an input for UD-AEKF. Then, the governing states that dictate the landing loads at the instant of touch down are compared. The method is verified using flight data wherein, the vertical acceleration at the aircraft center of gravity (CG) is compared. Two possible outcome of purely relying on the aircraft measured data is highlighted. It is observed that, with the implementation of adaptive fuzzy logic based extended Kalman filter tuned to adapt for aircraft landing dynamics, the methodology improves the data quality of the states that are sourced from noisy measurements.

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Authors and Affiliations

  1. Aeronautical Development Agency (Ministry of Defence), P. B. No. 1718, Vimanapura Post, Bengaluru 560017, India

    P. S. Suresh & Niranjan K. Sura

  2. Machine Design Section, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600036, India

    K. Shankar

Authors
  1. P. S. Suresh
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  2. Niranjan K. Sura
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  3. K. Shankar
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Correspondence to P. S. Suresh.

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Suresh, P.S., Sura, N.K. & Shankar, K. State Estimation for Landing Maneuver on High Performance Aircraft. J. Inst. Eng. India Ser. C 100, 187–202 (2019). https://doi.org/10.1007/s40032-017-0428-0

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  • DOI: https://doi.org/10.1007/s40032-017-0428-0

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