Oblique reflection

In this geometry the radar transmitter and receiver have a ground separation large compared to the meteor target height so that the specular condition results in a large scattering angle (the angle between the normal to the meteor train and the incident wave propagation direction, cf>, where 4> = 0 for transverse, backscattering case). In effect the Fresnel zone length for such a forward scatter configuration is increased by a factor (cos <f))~2 and the radar wavelength is effectively increased by a factor (cos<?!>)-1. Two valuable consequences compared to the strict transverse reflection result: the scattering cross-section is larger and the echo decay due to ambipolar diffusion is less rapid with consequential benefits for detecting high altitude rapidly diffusing meteors.

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