바이스태틱 SAR 영상 구조에 적용 가능한 병렬 압축센싱 기반 Back-Projection 알고리즘 실험적 검증 (Experimental Verification of a Parallel Compressive Sensing Based Back-Projection Algorithm for Bistatic SAR Imaging)

서지정보

· 발행기관 : 한국전자파학회
· 수록지 정보 : 한국전자파학회 논문지 / 36권 / 3호 / 304 ~ 312페이지
· 저자명 : 정지환, 이희우, 김평주, 유용선, 신경한, 이우경

초록

바이스태틱SAR는송신기와수신기가분리된구성을가지며, 동기화정밀도, 수신신호전력감소, 거리해상도저하와같은다양한기술적문제해결을요구한다. 특히, 송․수신기간기하정합의복잡성으로인해고품질영상획득을위해서는 Back-Projection 알고리즘(BPA)의 정합이 유리하다. 본 논문에서는 FMCW 레이다를 기반으로 국부 발진(LO) 신호를 무선으로공유하여바이스태틱데이터를획득하고, 모노스태틱및바이스태틱SAR 영상을비교및분석한다.
또한, 데이터손실상황에서도압축센싱기법을활용하여적은샘플만으로도일정수준이상의해상도를확보할수있으나연산시간이기하급수적으로증가하는문제가발생한다. 본논문에서는병렬구조의BPA-CS 알고리즘을제안하여블록크기를조절함으로써연산속도를크게향상시키는동시에PSNR 등영상성능을유지할수있음을보인다. 이를통해고해상도및데이터효율성이요구되는레이다영상화기술의실용적적용가능성을제시하며, 바이스태틱SAR의효용성을 강화하는 새로운 접근법을 제시한다.

영어초록

Bistatic SAR, characterized by the separation of the transmitter and receiver, requires solutions to various technical challenges such as synchronization precision, reduced received signal power, and degraded range resolution. Owing to the complexity of the geometric alignment between the transmitter and receiver, the Back-Projection Algorithm (BPA) is advantageous for obtaining high-quality images.
In this study, bistatic data were acquired using an FMCW radar with wirelessly shared local oscillator (LO) signals, and the monostatic and bistatic SAR images were compared and analyzed. Additionally, although compressive sensing enables high-resolution imaging with fewer samples, even under data loss conditions, it introduces the challenge of exponentially increasing the computation time. To address this, we propose a parallel BPA-CS algorithm that significantly improves computational speed by adjusting block sizes while maintaining image performance indicators, such as PSNR. This approach highlights the practical applicability of radar-imaging technologies that require high resolution and data efficiency, thereby providing a novel method for enhancing the utility of bistatic SAR.

참고자료

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