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

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Design of Sub-array Receiver for Active Phase Array Radar

능동위상배열 레이더 부배열 수신기 설계

  • Received : 2019.02.22
  • Accepted : 2019.04.22
  • Published : 2019.05.31
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Abstract

Modern Radars are evolving into MFRs which can search multiple targets simultaneously and then track them. Additionally they should be able to avoid some external jamming signals. Applying to these MFRs, Antennas should be able to perform DBF including to not only real-time beam steering but also multi-beam forming simultaneously. And they can cancel the beam at the specific direction. In this paper, we describe the implementation of sub-array type antenna hardware which can be applying DBF. Also we propose the modified amplitude aperture distribution for suppressing the side lobe level and explain the sub-array receiver design with amplitude tapering. It consists in making the amplitude weighting in 2 steps. In order to compare two weighting cases, we investigate the G/T performance for the array antenna. At the conclusion, we make a comparative study for the dynamic range of every sub-array receiver and present the hardware implementation that is more advantageous for sub-array alignment and calibration in DBF.

최신의 레이더는 동시에 다양한 다수의 표적을 탐색하고, 추적하며, 외부 재밍신호를 회피할 수 있는 다기능레이더 형태로 발전하고 있다. 이러한 다기능레이더 요구사항을 만족시키기 위해서 레이더 안테나는 실시간 빔조향 뿐만 아니라 동시에 다중 빔을 형성하고, 특정 방향에 대해 수신빔 제거 등 디지털 빔 형성이 가능한 능동위상배열 안테나 형태로 구현된다. 본 논문에서는 디지털 빔 형성이 가능한 부배열 타입 배열안테나의 하드웨어 구현방안에 대해 기술하였다. 또한 배열수신빔 형성시 부엽 준위를 낮추기 위한 안테나 개구면 진폭 가중치 적용방법에 따른 부배열 수신기 설계 방법을 제시하고, 진폭 가중치 적용방법에 따른 G/T 성능을 비교하였다. 또한 설계된 부배열 마다 부배열 수신기 동적 영역에 대해 분석하고, 디지털 빔형성기의 정렬 및 보정에 더 유리한 하드웨어 구현 방안을 제시하였다.

Keywords

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Fig. 1 Block Diagram for Active Phase Array Radar Rx Signal Path

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Fig. 2 Amplitude Weighting for Array antenna

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Fig. 3 Rx Antenna amplitude distribution with Taylor weighting

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Fig. 4 Sub-array structure of a quarter of the antenna

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Fig. 5 Amplitude weighting Applied in Rx array antenna

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Fig. 6 Modified Rx Antenna amplitude distribution with Taylor weighting

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Fig. 7 Complementary weighting Factor in Digital Beam Former

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Fig. 8 G/T Comparison between Fig. 4(a) and (b)

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Fig. 9 ADC Dynamic Range & Loss vs. α (sigmain/h)

Table. 1 Rx Antenna Requirements for MFR

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Table. 2 Characteristics of AD9461 ADC

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Table. 3 Comparison between SA9 and SA4 in the case of Fig 5(a)

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Table. 4 Comparison between SA9 and SA4 in the case of Fig 5(b)

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