광대역 방향 탐지를 위한 균일빔 기반 다중시스템 방향탐지 성능 분석 연구 (Performance Analysis of Frequency-Invariant Multi-System for Broadband Direction Finding)

서지정보

· 발행기관 : 한국전자파학회
· 수록지 정보 : 한국전자파학회 논문지 / 35권 / 11호 / 902 ~ 910페이지
· 저자명 : 유태호, 김태정, 문병귀, 최창호, 변강일

초록

본논문에서는광대역방향탐지를위한균일빔다중시스템을활용하여고속이동체가방사하는전파신호의방향을추정하고탐지성능을분석하였다. 균일빔알고리즘이란주파수에따라동일한패턴을생성하는기술로, 본논문에서는목표패턴의복잡도에관계없이빠르게균일빔가중치도출이가능한DFT(discrete Fourier transform) 기반 균일빔 알고리즘을 활용하였다. 균일빔을 모노펄스에 적용할 경우, 광대역에서 넓은 비모호 영역을 확보할수 있다. 이러한 기술은보조시스템을활용한모노펄스방탐시스템에활용할수있다. 모노펄스의비모호영역이보조시스템의탐지오차보다좁을경우, 방탐오차가증가하나, 균일빔을활용할경우넓은비모호영역확보로인해광대역에서방탐정확도를높일수있다. 본논문에서예제로제시한모노펄스수신기는16개로구성되고, 6∼20 GHz에서전파의방향을탐지하였으며, 단일시스템의경우±30° 범위내에서, SNR이20 dB에서1.04°의 오차를가진다. 다중시스템을적용할경우, ±45° 이내에서, SNR 5 dB일 때 3.82°으로 낮은 오차를 나타낸다.

영어초록

This study estimates the direction of radio signals radiated by high-speed mobile platforms and analyzes detection performance using a frequency-invariant multisystem for broadband direction finding (DF). The discrete Fourier transform (DFT)-based frequency-invariant beamforming (FIB) algorithm was used to generate a constant beam pattern regardless of the frequency utilized. DFT-based FIB enables the rapid derivation of FIB weights. When applying FIB to a monopulse, a wide unambiguous range can be achieved. This can be used for monopulse DF that utilizes auxiliary systems. When the unambiguous region of the monopulse is narrower than the error of the auxiliary system, the DF errors increase. However, by employing FIB, a broader unambiguous region can be achieved, enhancing DF accuracy. The monopulse receiver example in this study was composed of 16 elements and detected arbitrary signals in the range of 6∼20 GHz. Assuming a single-system setup with an incoming signal within ±30°, the system showed a DF error of 1.04° at an SNR of 20°dB. With a multi-system setup and a ±45° incoming signal range, the error was reduced to 3.82° at an SNR of 5 dB.

참고자료

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