The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
Copyrights notice
The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
최근 우주 합성개구레이더(SAR)의 개발로 초고공간 분해능이 화두가 되고 있다. 공간 분해능이 높은 시스템은 넓은 범위의 대역폭과 긴 방위각 통합 시간을 요구합니다. 그러나 방위각 적분 시간이 길기 때문에 초고해상도 스포트라이트 모드 운용에서는 무시할 수 없는 많은 문제가 발생한다. 본 논문에서는 초고해상도 우주 비행 SAR 스포트라이트 데이터의 전체 조리개 처리에 대해 주목해야 할 두 가지 중요한 문제를 조사합니다. 첫 번째는 시스템이 데시미터 범위 분해능에 접근할 때 기존 쌍곡선 범위 모델(HRM)의 부정확성입니다. 두 번째는 방위각 스펙트럼 폴딩 현상이다. 위에서 언급한 문제로 인해 포커싱 효과가 크게 저하됩니다. 따라서 이러한 문제를 해결하기 위해 본 논문에서는 일반적으로 사용되는 두 가지 처리 알고리즘인 MOCO(One-Step Motion Compensation) 알고리즘의 정밀도와 수정된 XNUMX단계 처리의 효율성의 장점을 결합한 전체 조리개 처리 방식을 제안합니다. 접근 방식(TSA). 첫째, 초고해상도 항공 SAR 시스템에 적용된 최첨단 MOCO 알고리즘인 원스텝 MOCO 알고리즘은 우주 곡선 궤도로 인해 발생하는 오차를 정밀하게 보정할 수 있습니다. 둘째, 수정된 TSA는 방위각 스펙트럼 접힘 현상을 효과적으로 피할 수 있습니다. 수정된 TSA의 핵심은 컨볼루션 연산을 통해 수행되는 디램핑 접근 방식입니다. 순시 범위 주파수에 따라 달라지는 기준 함수는 방위각 방향의 전개 스펙트럼을 얻기 위한 컨볼루션 연산에 의해 채택됩니다. 이러한 작업 후에는 우주의 곡선 궤도로 인한 오류와 방위각 방향의 스펙트럼 접힘의 영향이 완전히 해결되었으므로 전통적인 파수 영역 알고리즘을 사용할 수 있습니다. 이러한 처리 방식을 기반으로 초고해상도 우주 SAR 스포트라이트 데이터의 초점을 잘 맞출 수 있습니다. 전체 조리개 처리 방식의 성능은 포인트 타겟 시뮬레이션을 통해 입증됩니다.
Tianshun XIANG
The Nanjing University of Aeronautics and Astronautics
Daiyin ZHU
The Nanjing University of Aeronautics and Astronautics
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부
Tianshun XIANG, Daiyin ZHU, "Full-Aperture Processing of Ultra-High Resolution Spaceborne SAR Spotlight Data Based on One-Step Motion Compensation Algorithm" in IEICE TRANSACTIONS on Communications,
vol. E102-B, no. 2, pp. 247-256, February 2019, doi: 10.1587/transcom.2018ISP0018.
Abstract: With the development of spaceborne synthetic aperture radar (SAR), ultra-high spatial resolution has become a hot topic in recent years. The system with high spatial resolution requests large range bandwidths and long azimuth integration time. However, due to the long azimuth integration time, many problems arise, which cannot be ignored in the operational ultra-high resolution spotlight mode. This paper investigates two critical issues that need to be noticed for the full-aperture processing of ultra-high resolution spaceborne SAR spotlight data. The first one is the inaccuracy of the traditional hyperbolic range model (HRM) when the system approaches decimeter range resolution. The second one is the azimuth spectral folding phenomenon. The problems mentioned above result in significant degradation of the focusing effect. Thus, to solve these problems, a full-aperture processing scheme is proposed in this paper which combines the superiorities of two generally utilized processing algorithms: the precision of one-step motion compensation (MOCO) algorithm and the efficiency of modified two-step processing approach (TSA). Firstly, one-step MOCO algorithm, a state-of-the-art MOCO algorithm which has been applied in ultra-high resolution airborne SAR systems, can precisely correct for the error caused by spaceborne curved orbit. Secondly, the modified TSA can avoid the phenomenon of azimuth spectrum folding effectively. The key point of the modified TSA is the deramping approach which is carried out via the convolution operation. The reference function, varying with the instantaneous range frequency, is adopted by the convolution operation for obtaining the unfolding spectrum in azimuth direction. After these operations, the traditional wavenumber domain algorithm is available because the error caused by spaceborne curved orbit and the influence of the spectrum folding in azimuth direction have been totally resolved. Based on this processing scheme, the ultra-high resolution spaceborne SAR spotlight data can be well focused. The performance of the full-aperture processing scheme is demonstrated by point targets simulation.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.2018ISP0018/_p
부
@ARTICLE{e102-b_2_247,
author={Tianshun XIANG, Daiyin ZHU, },
journal={IEICE TRANSACTIONS on Communications},
title={Full-Aperture Processing of Ultra-High Resolution Spaceborne SAR Spotlight Data Based on One-Step Motion Compensation Algorithm},
year={2019},
volume={E102-B},
number={2},
pages={247-256},
abstract={With the development of spaceborne synthetic aperture radar (SAR), ultra-high spatial resolution has become a hot topic in recent years. The system with high spatial resolution requests large range bandwidths and long azimuth integration time. However, due to the long azimuth integration time, many problems arise, which cannot be ignored in the operational ultra-high resolution spotlight mode. This paper investigates two critical issues that need to be noticed for the full-aperture processing of ultra-high resolution spaceborne SAR spotlight data. The first one is the inaccuracy of the traditional hyperbolic range model (HRM) when the system approaches decimeter range resolution. The second one is the azimuth spectral folding phenomenon. The problems mentioned above result in significant degradation of the focusing effect. Thus, to solve these problems, a full-aperture processing scheme is proposed in this paper which combines the superiorities of two generally utilized processing algorithms: the precision of one-step motion compensation (MOCO) algorithm and the efficiency of modified two-step processing approach (TSA). Firstly, one-step MOCO algorithm, a state-of-the-art MOCO algorithm which has been applied in ultra-high resolution airborne SAR systems, can precisely correct for the error caused by spaceborne curved orbit. Secondly, the modified TSA can avoid the phenomenon of azimuth spectrum folding effectively. The key point of the modified TSA is the deramping approach which is carried out via the convolution operation. The reference function, varying with the instantaneous range frequency, is adopted by the convolution operation for obtaining the unfolding spectrum in azimuth direction. After these operations, the traditional wavenumber domain algorithm is available because the error caused by spaceborne curved orbit and the influence of the spectrum folding in azimuth direction have been totally resolved. Based on this processing scheme, the ultra-high resolution spaceborne SAR spotlight data can be well focused. The performance of the full-aperture processing scheme is demonstrated by point targets simulation.},
keywords={},
doi={10.1587/transcom.2018ISP0018},
ISSN={1745-1345},
month={February},}
부
TY - JOUR
TI - Full-Aperture Processing of Ultra-High Resolution Spaceborne SAR Spotlight Data Based on One-Step Motion Compensation Algorithm
T2 - IEICE TRANSACTIONS on Communications
SP - 247
EP - 256
AU - Tianshun XIANG
AU - Daiyin ZHU
PY - 2019
DO - 10.1587/transcom.2018ISP0018
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E102-B
IS - 2
JA - IEICE TRANSACTIONS on Communications
Y1 - February 2019
AB - With the development of spaceborne synthetic aperture radar (SAR), ultra-high spatial resolution has become a hot topic in recent years. The system with high spatial resolution requests large range bandwidths and long azimuth integration time. However, due to the long azimuth integration time, many problems arise, which cannot be ignored in the operational ultra-high resolution spotlight mode. This paper investigates two critical issues that need to be noticed for the full-aperture processing of ultra-high resolution spaceborne SAR spotlight data. The first one is the inaccuracy of the traditional hyperbolic range model (HRM) when the system approaches decimeter range resolution. The second one is the azimuth spectral folding phenomenon. The problems mentioned above result in significant degradation of the focusing effect. Thus, to solve these problems, a full-aperture processing scheme is proposed in this paper which combines the superiorities of two generally utilized processing algorithms: the precision of one-step motion compensation (MOCO) algorithm and the efficiency of modified two-step processing approach (TSA). Firstly, one-step MOCO algorithm, a state-of-the-art MOCO algorithm which has been applied in ultra-high resolution airborne SAR systems, can precisely correct for the error caused by spaceborne curved orbit. Secondly, the modified TSA can avoid the phenomenon of azimuth spectrum folding effectively. The key point of the modified TSA is the deramping approach which is carried out via the convolution operation. The reference function, varying with the instantaneous range frequency, is adopted by the convolution operation for obtaining the unfolding spectrum in azimuth direction. After these operations, the traditional wavenumber domain algorithm is available because the error caused by spaceborne curved orbit and the influence of the spectrum folding in azimuth direction have been totally resolved. Based on this processing scheme, the ultra-high resolution spaceborne SAR spotlight data can be well focused. The performance of the full-aperture processing scheme is demonstrated by point targets simulation.
ER -