저고도 표적추적을 위한 다중주파수 다중빔을 이용한 각도추정 방법 = Angle Estimation Technique Using Multi-Frequency Multi-Beam for Low-Altitude Target Tracking

국문 초록 (Abstract)

레이다를이용한저고도표적추적시, 해수면·지상과가까워다중경로간섭이크게발생하고, 이로인해모노펄스각도추정에 큰 오차가 생긴다. 본 논문에서는 이러한 문제를 해결하기 위하여 다중주파수(multi-frequency)와 다중빔(multi-beam)을 결합한 MFMB(multi-frequency multi-beam) 방법을 제안한다. 먼저, 주파수별 간섭 패턴이 서로 상쇄될 수있도록회기신호기반최적의주파수조합을도출한다. 이후, 각주파수에서생성된수신신호를합성하고다중빔을적용함으로써각도추정정확도를높일수있다. 시뮬레이션결과, 제안된MFMB 방법은모노펄스대비각도추정오차를크게 줄임을확인하였다.

다국어 초록 (Multilingual Abstract)

When tracking low-altitude targets using radar, significant multi-path interference occurs because of their proximity to the sea surface or ground, leading to substantial errors in the monopulse angle estimation. To address this issue, this study proposes the multi-frequency multi-beam (MFMB) technique that combines the multi-frequency and multi-beam approaches. First, an optimal frequency combination is derived using linear regression to ensure that the interference patterns at different frequencies cancel one another out. Subsequently, the received signals at each frequency are synthesized, and multi-beam processing is applied to enhance the angle estimation accuracy.
The simulation results confirm that the proposed MFMB method significantly reduces angle estimation errors compared with monopulse techniques, thereby contributing to improved detection and tracking of low-altitude targets in maritime and complex terrain environments.