실내 환경에서 멀티패스 효과 완화를 통한 고해상도 맵 생성 기법 연구 (Study on a High-Resolution Map Generation Method by Mitigating Multipath Effects in Indoor Environments)

서지정보

· 발행기관 : 한국전자파학회
· 수록지 정보 : 한국전자파학회 논문지 / 35권 / 10호 / 842 ~ 856페이지
· 저자명 : 이정민, 김경태

초록

본논문에서는실내환경에서멀티패스효과를완화해표적정보를정확히파악하기위한새로운기법을제안한다.
우선, 수신데이터에2차원고속푸리에변환을적용해거리-속도맵을생성한다음, 지수이동평균을통해정적멀티패스효과를완화한다. 이후, 여러거리-속도맵을그룹화해거리축분산값과상관계수를기반으로임계값을설정하고, 이를이용해신호처리할거리-속도맵을그룹내에서선택한다. 이후, 선택된거리-속도맵들에고유값분해를적용해투영행렬을생성한다음이에투영시켜동적멀티패스효과도완화한다. 다음으로, 동적멀티패스효과가완화된거리속도맵을이용, Capon 기법으로 속도-각도 맵을생성한다음, 그룹내에서비동기적합성을하였다. 실측실험을통해제안된기법의성능을검증한결과, 기존기법에비해신호대잡음비가최대18.7 dB 향상됐고, 거리-속도맵에서탐지성능이 향상됐고, 부엽이 최대 2.4 dB 감소했으며, 전체 프레임 처리 시간이 최대 12.47 % 줄어들었음을 확인했다.

영어초록

This study proposes a novel method for accurately identifying target information by mitigating multipath effects in indoor environments. First, range–velocity maps were generated by applying a 2D fast Fourier transform to received data. Then, the influence of stationary clutter was decreased using the exponential moving average. Next, multiple range–velocity maps were grouped, and thresh olds were set based on the variance along the range axis of the range–velocity maps and correlation coefficients to select the range–ve locity maps for signal processing. Then, eigenvalue decomposition was applied to the selected range–velocity maps to create projection matrices, and dynamic multipath effects were mitigated by projecting the previously selected range–velocity maps. Subsequently, veloc ity–angle maps were produced using the Capon method based on range–velocity maps with reduced dynamic multipath effects. Finally, noncoherent integration was applied within the group. The performance of the proposed method was verified through experimental measurements. The proposed method improved the signal-to-noise ratio by up to 18.7 dB, enhanced detection performance, reduced the sidelobe level by up to 2.4 dB, and decreased the total frame processing time by up to 12.47 %.

참고자료

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