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배열 안테나 기반 GPS 수신기에서의 교정 방안

A Calibration Technique for Array antenna based GPS Receivers

  • Kil, Haeng-bok (Department of Information and Communication Engineering, Hanbat National University) ;
  • Joo, Hyun (Research Center of Communication and Electronic Warfare, LIG Nex1) ;
  • Lee, Chulho (Research Center of Communication and Electronic Warfare, LIG Nex1) ;
  • Jeong, Eui-Rim (Department of Information and Communication Engineering, Hanbat National University)
  • 투고 : 2018.01.28
  • 심사 : 2018.04.03
  • 발행 : 2018.04.30

초록

본 논문에서는 배열 안테나 기반의 MVDR (minimum variance distortionless response) 항 재밍 GPS (global positioning system) 수신기에서 안테나 경로 사이에 존재하는 이득, 위상, 지연 편차를 교정하기 위한 안테나 교정 기법을 제안한다. 제안하는 기법은 다중 안테나 시스템에서 안테나 경로들 사이의 이득, 위상, 지연 편차를 추정하고 이를 보상한다. 경로 간 이득, 위상, 지연 편차를 정확히 추정하기 위해 좋은 상관 특성을 갖는 파일럿 신호가 사용된다. 교차 상관에 기반하여 지연 편차가 먼저 추정되며 이후에 이득과 위상 편차가 추정된다. 정밀한 지연 편차 추정 및 보상을 위해 보간기법을 사용하는데 이산 푸리에 변환 (DFT) 기반의 보간기법으로 계산 복잡도를 감소시킨다. 제안된 기법은 MATLAB을 이용한 컴퓨터 모의실험을 통해 검증한다. 모의실험 결과에 따르면 제안하는 기법을 적용하면 이득, 위상 시간 지연 편차를 각각 0.01 dB, 0.05 도, 0.5 ns 이내로 줄일 수 있다.

In this paper, a new signal processing technique is proposed for calibrating gain, phase, delay offsets in array antenna based anti-jamming minimum variance distortionless response (MVDR) global-positioning-system (GPS) receivers. The proposed technique estimates gain, phase and delay offsets across the antennas, and compensates for the offsets based on the estimates. A pilot signal with good correlation characteristics is used for accurate estimation of the gain, phase and delay offsets. Based on the cross-correlation, the delay offset is first estimated and then gain/phase offsets are estimated. For fine delay offset estimation and compensation, an interpolation technique is used, and specifically, the discrete Fourier transform (DFT) is employed for the interpolation technique to reduce the computational complexity. The proposed technique is verified through computer simulation using MATLAB. According to the simulation results, the proposed technique can reduce the gain, phaes and delay offset to 0.01 dB, 0.05 degree, and 0.5 ns, respectively.

키워드

참고문헌

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피인용 문헌

  1. UWB 시스템에서 합성곱 신경망을 이용한 거리 추정 vol.23, pp.10, 2018, https://doi.org/10.6109/jkiice.2019.23.10.1290
  2. UWB 시스템에서 실내 측위를 위한 순환 신경망 기반 거리 추정 vol.24, pp.4, 2020, https://doi.org/10.6109/jkiice.2020.24.4.494