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首页> 外文会议>30th International Conference on Radar Meteorology, Jul 19-24, 2001, Munich, Germany >DOPPLER RADAR SIGNATURES OF MIGRATING BIRDS
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DOPPLER RADAR SIGNATURES OF MIGRATING BIRDS

机译：鸟的多普勒雷达签名

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摘要

We presented here the results of Doppler weather radar measurements of migrating birds, performed in the "fixed-beam" mode of operation. The observation time window of each resolution cell (～4s), much longer than in the case of operative weather radars, allowed to provide accurate estimates of reflectivity and Doppler moments: reflectivity values were mainly comprised between 0 and 15 dBZ (tail-view according to prevalent migratory direction observed on PPIs). Velocities were basically within the interval 8.3-16.7 m/s (30-60 km/h), while measured spectral widths were usually below 1 m/s. Time histories of associated echoes showed the typical amplitude modulation associated to wingbeating. 90% of wingbeat frequencies were in the interval 5-25 Hz: two distinct groups with a different combination wingbeat frequency-velocity were visible, suggesting the idea that faster birds flap their wings at a lower rate. In order to gather more information about reflectivity values associated to birds, further measurements are needed considering different view angles; in view of species identification, correlation of velocity and wingbeat with additional variables like the presence or absence of gliding flight intervals, the extent of signal amplitude modulation, the time and height of flight could prove useful.
机译：我们在这里介绍了以“固定波束”操作模式执行的多普勒天气雷达对迁徙鸟类的测量结果。每个分辨单元的观察时间窗口（〜4s）比可操作的气象雷达要长得多，可以提供反射率和多普勒矩的准确估计：反射率值主要在0到15 dBZ之间（视到在PPI上观察到的普遍迁徙方向）。速度基本上在8.3-16.7 m / s（30-60 km / h）的区间内，而测得的光谱宽度通常在1 m / s以下。相关回声的时间历史记录显示了与拍打相关的典型幅度调制。 90％的翅膀频率在5-25 Hz之间：可以看到两组不同的翅膀频率-速度组合，这表明较快的鸟类以较低的速度拍打翅膀的想法。为了收集有关与鸟类相关的反射率值的更多信息，需要考虑不同的视角进行进一步的测量。考虑到物种识别，将速度和机翼节拍与其他变量（例如是否存在滑行飞行间隔），信号幅度调制程度，飞行时间和高度相关联。

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