Journal of the Korean Society for Aeronautical & Space Sciences (한국항공우주학회지)

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
권호 표지
DOI QR코드

DOI QR Code

RF Seeker LOS Rate Estimation Method using Covariance and Signal Management

공분산 및 신호관리를 이용한 RF탐색기 시선각 변화율 추정기법

  • Received : 2011.04.28
  • Accepted : 2012.02.22
  • Published : 2012.04.01
Download PDF
⟨ Previous Next ⟩

Abstract

The line-of-sight(LOS) rate is estimated using Kalman filter in Radio-Frequency(RF) seeker. For the two axis gimbaled seeker, proper system modeling is considered and the basic filter structure is set up. The main issue for Kalman filter is choosing the proper process and measurement noise. For the measurement process, the signal to noise ratio(SNR) and other components are introduced. To cope with the eclipse problem or other abnormal seeker status, the pseudo input signal concept is proposed. By conditioning abnormal signals, the LOS rate estimation performance is increased. The process noise is also an important factor in the propagation phase. The analytical approach on a process noise component is performed and a reliable region for the filter is calculated based on the eigenvalue analysis. Some numerical simulations are performed to check the validity of suggested algorithm.

칼만 필터를 이용하여 RF 탐색기의 시선각 변화율 추정을 수행하였다. 김발형 탐색기의 모델링을 기반으로 칼만필터를 설계하였다. 필터 설계 시 주요한 인자인 공정 잡음 및 측정 잡음의 특성에 대해 살펴보았으며, RF 탐색기의 신호 특성에 맞는 측정 잡음치를 선정하여 필터링을 수행하였다. 측정 잡음관리를 위해 SNR 및 관련 신호를 이용하였으며, 공정 잡음에 따른 필터의 민감도 확인을 위해 대수적 방식을 사용하였다. 일식 등으로 탐색기 신호가 없는 경우 선형 해석을 통해 필터의 안정도를 분석하였다. 수치 시뮬레이션을 통해 제안된 시선각 변화율 추정기법의 타당성을 검토하였다.

Keywords

References

  1. Uhrmeister, B. "Kalman Filters for a Missile with Radar and/or Imaging Sensor," Journal of Guidance, Control, and Dynamics, Vol. 17, No. 6, 1994, pp.1339-1344. https://doi.org/10.2514/3.21353
  2. Waldmann, J. "Line-of-Sight Rate Estimation and Linearizing Control of an Imaging Seeker in a Tactical Missile Guided by Proportional Navigation," IEEE Transactions on Control Systems Technology, Vol.10, No.4, 2002, pp.556-567. https://doi.org/10.1109/TCST.2002.1014675
  3. 정상근, 김을곤, "Bank-to-Turn 유도탄의 호밍 유도를 위한 2축 김발형 탐색기 동체운동 상관 보상," 한국항공우주학회지, Vol. 30, No. 6, 2002, pp.101-106.
  4. 오승민, "스트랩다운 탐색기를 장착한 전술 유도탄의 UKF 기반 종말호밍 유도," 한국항공우주학회지, Vol. 38, No. 3, 2010, pp.221-227
  5. Bhattacharyya, A.K., Bhattacharya, S., and Mukhopadhyay, S, "Modeling of RF Seeker Dynamics and Noise Characteristics for Estimator Design in Homing Guidance Application," IEEE Region 10 and the Third international Conference on Industrial and Information Systems, 2008., Kharagpur, Dec. 2008, pp.1-7.
  6. Ekstrand B., "Tracking Filters and Models for Seeker Application," IEEE Transactions on Aerospace and Electronic Systems, Vol. 37, No. 3, 2001, pp.965-977. https://doi.org/10.1109/7.953250
  7. 문관영, 전병을, 이재웅, "RF 탐색기 호밍필터 공분산 및 신호 관리기법," 한국항공우주학회 추계 학술발표회, 제주, 2011, pp.623-626.
  8. Zarchan P., Tactical and Startegic Missile Guidance, 4th edition, AIAA, Inc., Reston, Virginia, USA, 2007.
  9. Brown R.G and Hwang P. Y.C., Introduction to Random Signals and Applied Kalman Filtering, 3rd edition, John Wiley & Sons Inc., New York, USA, 1997.
  10. Gelb A., Applied Optimal Estimation, The MIT press, Cambridge, Massachusetts, USA, 1974.
  11. Hugehes, E., Guided Weapon Seekers, Cranfield Univ., UK, 2007.