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多模式小卫星SAR（synthetic aperture radar,合成孔径雷达）是一种搭载于小卫星平台的新体制雷达系统,它集SAR、散射计、高度计、波谱仪4种遥感器的优势于一身。它可以根据需求分时实现几种工作模式的切换,可兼顾对海洋目标和海洋动力环境的高精度测量。由于卫星发射存在诸多不确定因素,为了在卫星发射前对多模式小卫星SAR进行检验,本文对拟开展的机载挂飞试验进行了介绍。首先,介绍了拟开展的机载挂飞试验的等效性原则。接下来,介绍了各种工作模式试验、SAR/散射计联合反演试验、多视向SAR试验的飞行路线规划。之后,介绍了机载挂飞试验的雷达参数设计方法。最后,给出了各种工作模式的雷达参数设计结果。所设计的飞行路线和雷达参数可以为机载挂飞试验服务,并且实现了星载技术指标的准等效验证。通过小卫星SAR卫星组网可弥补目前SAR卫星时间分辨率低的缺点。 相似文献
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黄家沟泥石流的基本特征及成因分析 总被引：3，自引：0，他引：3
黄家沟是一条具有较强活动性的泥石流沟,对富泉集镇新址构成了较大的安全隐患,文章针对其基本特征及成因进行了分析。 相似文献
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The typical organic pollutant polycyclic aromatic hydrocarbon (PAH) anthracene was selected as a contaminant to investigate its effects on the activities of superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GSH-Px) in the clam Ruditapes philippinarum. The results show that SOD, CAT and GSH-Px had diff erent induction and inhibition reactions to anthracene stress, and that three diff erent organs in R. philippinarum (visceral mass, muscle tissue and mantle) had diff erent sensitivities to anthracene stress. This study suggest that SOD activities of the visceral mass, CAT activitities of the mantle and the visceral mass, and GSH-Px activity of the muscle tissue could be used as sensitive indicators of anthracene stress in R. philippinarum. 相似文献
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