天镜韵湖 | 微型SAR:L波段SAR监测海洋涌浪

Browse: 52 Time: 2026-01-15

一、L波段SAR应用在海洋监测上

  在广袤的海洋之上,涌浪作为长距离传播的海浪现象,不仅影响着海上航行安全、港口设施建设,更与全球海洋能量循环息息相关。如何精准捕捉这些藏在海面之下的运动轨迹?L波段合成孔径雷达(SAR)正凭借其独特优势,成为监测海洋涌浪的“太空慧眼”。 

合成孔径雷达(SAR)是一种不受天气、昼夜影响的主动遥感技术,通过发射微波信号并接收海面反射波,能够清晰捕捉海洋表面的细微变化。与 C 波段、X 波段 SAR 相比,L 波段 SAR 波长更长,穿透性强、大气干扰小,尤其适合近岸长周期涌浪探测。星载的相控阵列 L 波段 SAR(PALSAR)观测刈幅达 40-70 公里,方位与斜距分辨率分别为 17.8 米和 4.68 米,能提供大范围高清晰度观测数据。

而微型 L 波段 SAR 的出现,进一步拓展了技术应用边界。微型 SAR 最大的优势在于轻量化与低成本,其体积通常仅为传统 SAR 的几十分之一,重量可控制在数公斤以内,无需大型载体即可部署。这使得它能够灵活搭载于小型无人机、轻型飞机等平台,实现 “随用随部署” 的快速响应观测。同时,微型 SAR 的研发与运营成本显著降低,打破了传统 SAR 技术高门槛的限制,让更多科研机构、沿海管理部门能够开展针对性观测。此外,微型 SAR 的功耗更低,续航能力更强,可实现长时间、近距离的持续监测,尤其适合对特定近岸区域、港口航道等小范围关键区域进行精细化观测,弥补了星载 SAR 重访周期长、细节观测不足的短板。

机载 L 波段 SAR 则兼具了星载 SAR 的大范围观测能力与微型 SAR 的灵活特性,形成了独特的技术优势。首先,机载平台的飞行高度可灵活调整,既能在数百米高度对近岸浅水区进行厘米级分辨率的精细观测,捕捉涌浪与海底地形的相互作用细节,也能在数千米高度实现百公里级的大范围覆盖,快速掌握区域波场分布。其次,机载 SAR 的观测时效性极强,可根据海洋灾害预警、应急救援等需求,随时起飞开展观测,不受卫星轨道约束,能在短时间内获取目标区域的涌浪参数,为决策提供实时数据支持。再者,机载 L 波段 SAR 的观测环境更稳定,受大气干扰进一步减小,且可通过调整飞行路径,避开云层、降雨等局部干扰区域,确保图像数据质量。同时,机载平台便于携带更多辅助设备,可与现场观测仪器同步作业,实现遥感数据与实测数据的实时匹配验证,提升反演结果的准确性

回归L波段SAR监测涌浪的核心原理,是基于“线性成像机制”的假设。涌浪作为长周期波浪,传播时能量损失小,其表面形态相对稳定,能够通过调制海面小尺度的布拉格波,在SAR图像上形成清晰的波浪条纹。科研人员通过对SAR图像进行辐射校正、高斯高通滤波等一系列处理后,运用二维快速傅里叶变换(2-D FFT)提取出SAR图像谱,再从谱峰位置计算出涌浪的波长和传播方向。

 为验证反演结果的准确性,科研人员将L波段SAR的观测数据与日本“全国港湾海洋波浪情报网”的现场观测数据进行了比对。通过海底部署的超声波浪计、多普勒式波向计等设备,长期记录海洋波浪参数,为遥感数据提供了可靠的地面验证依据。比对结果显示,L波段SAR反演的涌浪波长偏差仅为-10.5米,均方差18.3米,相关系数高达0.94;波向偏差为-1.3°,均方差15.5°,相关系数同样达到0.94,充分证明了该技术的可靠性。

 目前,L波段SAR在已在近岸海域监测、海上交通安全保障、海岸工程规划等领域发挥重要作用。但海洋观测中的应用仍在拓展,随着技术的不断进步,未来通过积累更多匹配数据、完善成像机制模型,L波段SAR将能提供更全面的涌浪参数,为海洋灾害预警、海洋资源开发等提供更有力的技术支撑,让这颗“太空慧眼”持续为人类探索海洋奥秘保驾护航。

二、机载微型sar系统

苏州天镜韵湖智能科技有限公司(简称:天镜韵湖)致力于成为全球领先的合成孔径雷达方案解决商为用户提供定制化雷达设备、SAR数据采集服务、雷达数据产品天镜韵湖凭借多年的研发经验和专业技术积累,推出多个波段、具备多种能力的调频连续波及脉冲体制的SAR产品。目前,天镜韵湖已具备X、Ku、K、Ka、C、W、L等多个波段的覆盖,且产品系统具备单极化、全极化、条带、聚束、干涉、单脉冲搜索等模式,产品具有实时成像、GMTI、形变监测等功能。天镜韵湖SAR产品可搭载多旋翼/固定翼无人机、有人机、卫星及车载等平台。

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