{"title":"基于方位角相位编码的四极交错空载合成孔径雷达测距模糊抑制的新型 PRI 变化策略","authors":"Ruizhen Song;Wei Wang;Yongwei Zhang;Yuwei Wu;Weidong Yu","doi":"10.1109/JSTARS.2024.3466135","DOIUrl":null,"url":null,"abstract":"Staggered synthetic aperture radar (SAR) is compatible with quadrature-polarimetric (quad-pol) SAR, enabling ultrawide continuous swath quad-pol SAR imaging with fine azimuth resolution. However, the quad-pol staggered spaceborne SAR is constrained by severe range ambiguity in the cross-pol channel. Moreover, azimuth phase coding (APC), as an excellent technique for range ambiguity suppression, is no longer exactly effective in the staggered imaging mode because the range ambiguities for different azimuth samples are located at different slant ranges. Given the above challenges presented in quad-pol staggered SAR, in this article, a novel pulse repetition interval (PRI) variation strategy based on APC is proposed to suppress range ambiguity in quad-pol staggered spaceborne SAR. First, the range ambiguity signal for quad-pol staggered SAR is modeled and analyzed. Then, the dedicated PRI variation strategy for quad-pol staggered SAR is developed, by which the near or far first-order range ambiguity is coherent in azimuth and can be subsequently suppressed using APC technique. Especially, a scale factor is developed in the novel PRI variation strategy, which can be flexibly designed to optimize the time interval of alternately transmitted polarized pulses. By this, most of the incoherent far or near first-order range ambiguity energy can be significantly reduced. Finally, simulations are conducted to verify the advancement of the proposed approach for range ambiguity suppression in quad-pol staggered SAR. The work in this article can be viewed as an important candidate for range ambiguity suppression in future quad-pol staggered spaceborne SAR.","PeriodicalId":13116,"journal":{"name":"IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing","volume":null,"pages":null},"PeriodicalIF":4.7000,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10689276","citationCount":"0","resultStr":"{\"title\":\"A Novel PRI Variation Strategy for Range Ambiguity Suppression in Quad-Pol Staggered Spaceborne SAR Based on Azimuth Phase Coding\",\"authors\":\"Ruizhen Song;Wei Wang;Yongwei Zhang;Yuwei Wu;Weidong Yu\",\"doi\":\"10.1109/JSTARS.2024.3466135\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Staggered synthetic aperture radar (SAR) is compatible with quadrature-polarimetric (quad-pol) SAR, enabling ultrawide continuous swath quad-pol SAR imaging with fine azimuth resolution. 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引用次数: 0
摘要
交错合成孔径雷达(SAR)与正交偏振合成孔径雷达(quadrature-polarimetric,quad-pol)兼容,可实现具有精细方位角分辨率的超宽连续扫描带 quad-pol SAR 成像。然而,四极交错星载合成孔径雷达受到交叉极通道严重测距模糊的限制。此外,方位角相位编码(APC)作为一种抑制测距模糊的优秀技术,在交错成像模式下不再完全有效,因为不同方位角样本的测距模糊位于不同的斜距范围。鉴于四极交错合成孔径雷达所面临的上述挑战,本文提出了一种基于 APC 的新型脉冲重复间隔(PRI)变化策略,以抑制四极交错星载合成孔径雷达中的测距模糊。首先,对四极交错合成孔径雷达的测距模糊信号进行建模和分析。然后,为四极交错合成孔径雷达开发了专用的 PRI 变化策略,通过该策略,近或远一阶测距模糊信号在方位角上是相干的,随后可使用 APC 技术加以抑制。特别是,在新颖的 PRI 变化策略中开发了一个比例因子,可灵活设计以优化交替传输极化脉冲的时间间隔。这样,大部分非相干的远或近一阶范围模糊能量就能显著降低。最后,通过仿真验证了所提出的四极交错合成孔径雷达测距模糊抑制方法的先进性。本文中的工作可被视为未来四极交错星载合成孔径雷达范围模糊抑制的重要候选方案。
A Novel PRI Variation Strategy for Range Ambiguity Suppression in Quad-Pol Staggered Spaceborne SAR Based on Azimuth Phase Coding
Staggered synthetic aperture radar (SAR) is compatible with quadrature-polarimetric (quad-pol) SAR, enabling ultrawide continuous swath quad-pol SAR imaging with fine azimuth resolution. However, the quad-pol staggered spaceborne SAR is constrained by severe range ambiguity in the cross-pol channel. Moreover, azimuth phase coding (APC), as an excellent technique for range ambiguity suppression, is no longer exactly effective in the staggered imaging mode because the range ambiguities for different azimuth samples are located at different slant ranges. Given the above challenges presented in quad-pol staggered SAR, in this article, a novel pulse repetition interval (PRI) variation strategy based on APC is proposed to suppress range ambiguity in quad-pol staggered spaceborne SAR. First, the range ambiguity signal for quad-pol staggered SAR is modeled and analyzed. Then, the dedicated PRI variation strategy for quad-pol staggered SAR is developed, by which the near or far first-order range ambiguity is coherent in azimuth and can be subsequently suppressed using APC technique. Especially, a scale factor is developed in the novel PRI variation strategy, which can be flexibly designed to optimize the time interval of alternately transmitted polarized pulses. By this, most of the incoherent far or near first-order range ambiguity energy can be significantly reduced. Finally, simulations are conducted to verify the advancement of the proposed approach for range ambiguity suppression in quad-pol staggered SAR. The work in this article can be viewed as an important candidate for range ambiguity suppression in future quad-pol staggered spaceborne SAR.
期刊介绍:
The IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing addresses the growing field of applications in Earth observations and remote sensing, and also provides a venue for the rapidly expanding special issues that are being sponsored by the IEEE Geosciences and Remote Sensing Society. The journal draws upon the experience of the highly successful “IEEE Transactions on Geoscience and Remote Sensing” and provide a complementary medium for the wide range of topics in applied earth observations. The ‘Applications’ areas encompasses the societal benefit areas of the Global Earth Observations Systems of Systems (GEOSS) program. Through deliberations over two years, ministers from 50 countries agreed to identify nine areas where Earth observation could positively impact the quality of life and health of their respective countries. Some of these are areas not traditionally addressed in the IEEE context. These include biodiversity, health and climate. Yet it is the skill sets of IEEE members, in areas such as observations, communications, computers, signal processing, standards and ocean engineering, that form the technical underpinnings of GEOSS. Thus, the Journal attracts a broad range of interests that serves both present members in new ways and expands the IEEE visibility into new areas.