Abstract
There are arguments about the scattering mechanism of the 10-dB periodic signal fluctuations posed by the repetitive flapping motion in radar ornithology. We design a dynamic measurement system composed of a network analyzer and a high-speed camera to track dynamic modulation on radar signals of flapping gaits of birds within the S-band, X-band, and Ku-band. The results indicate that the respiration motion contributes little to the bird’s signals, but the flapping wings contribute at least 10 dB to the signal fluctuation related to the flapping gaits to the radar echoes from flying birds, regarding different radar bands, observing angles and bird species. Furthermore, the contributions observed in the tests indicate that our theory of the time-varying wingbeat corner reflector (WCR) effect is correct in explaining the modulation mechanism of the 10-dB signal fluctuations in radar ornithology.
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