Journal of the Korea Institute of Information and Communication Engineering (한국정보통신학회논문지)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Analysis of Sea Clutter Removal Capability in a Weather Radar Based on a Vertical Phased Array Antenna

수직 위상 배열 안테나 기반 기상 레이다에서의 해수면 클러터 제거 성능 분석

  • Lee, Jonggil (Department of Information and Telecommunication Engineering, Incheon National University)
  • Received : 2017.08.19
  • Accepted : 2017.08.30
  • Published : 2018.01.31
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Abstract

Many short range weather radars with the low elevation search capability are needed for analysis and prediction of unusual weather changes or rainfall phenomena which occurs regionally. However, due to the characteristics of low elevation electromagnetic wave beam, it is highly probable that the received weather signals of these radars are contaminated by the ground and sea clutter. Since most of ground clutter appears around the very narrow low Doppler frequency region, it is somewhat easy to separate. However, the sea clutter removal is very difficult since it can occupy the broad Doppler frequency region according to weather conditions. Therefore, in this paper, the sea clutter removal capability is analyzed for a phased array weather radar which use vertical array elements for electronic elevation beam steering. Also, it is shown that the sea clutter removal can be achieved appropriately using the receiver beam forming technology in a phased array antenna.

국지적인 기상 이변이나 강우 현상 등을 분석하고 예보하기 위해서는 지역별로 저고도 탐색이 가능한 다수의 단거리 기상 레이다들이 필요하다. 그러나 이러한 레이다들의 특성인 낮은 고각의 전자파 빔 때문에 지표면 및 해수면 클러터가 기상 반사 신호를 오염시킬 가능성이 매우 높다. 대부분의 지표면 클러터는 매우 낮은 도플러 주파수 부근에 집중되어 나타나므로 주파수 대역에서의 구분이 비교적 용이한 편이다. 그러나 해수면 클러터의 경우 도플러 주파수 점유대역이 기상조건에 따라 매우 넓게 나타날 수 있기 때문에 클러터의 제거가 매우 어려운 실정이다. 따라서 본 논문에서는 전자적인 고각 빔 조향을 위하여 수직 위상 배열 안테나 구조를 갖는 기상 레이다에서의 해수면 클러터 제거 성능 정도를 분석하였다. 또한 위상배열 안테나의 수신 빔 형성을 통하여 해수면 클러터의 제거가 적절하게 이루어질 수 있음을 보였다.

Keywords

References

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