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Earth and Space Sciences · 术语表

什么是 Synthetic-aperture radar; radar backscatter？

又称： synthetic-aperture radar · radar backscatter

Definition 25.9 University Earth and Space Sciences — Year 3 · 第 25 章 — Remote Sensing and GIS

A synthetic-aperture radar (SAR) is a radar carried along a track that looks sideways, and that combines the echoes it records from the same point of the ground along a length of its track, keeping their phases, as if they had been received by one antenna as long as that length. The radar backscatter of a surface is the fraction of the power it receives that it sends back towards the antenna.

The geometry of a side-looking radar, in the plane perpendicular to its track. The beam lights a swath to one side of the nadir; a point of the ground is seen at the slant range R under the incidence angle , along the line of sight (LOS). Echoes are sorted by their delay across the track, in range, and by the phase history of the synthetic aperture along it, in azimuth. — The geometry of a side-looking radar, in the plane perpendicular to its track. The beam lights a swath to one side of the nadir; a point of the ground is seen at the slant range $R$ under the incidence angle $\theta$ , along the line of sight (LOS). Echoes are sorted by their delay across the track, in range, and by the phase history of the synthetic aperture along it, in azimuth.

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