Radar for space-borne use
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United States of America Patent
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Mar 19, 2002
Grant Date -
N/A
app pub date -
Sep 22, 2000
filing date -
Sep 23, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Faraday Rotation causes rotation of the plane of polarization of plane polarised radiation emitted by a radar e.g. a synthetic aperture radar and, if returns polarized in orthogonal planes are measured at the synthetic aperture radar in order to determine polarimetric characteristics of the ground, which could show up features of the ground such as crop patterns, the measurements made at the SAR are contaminated by the Faraday Rotation. In the invention, the transmitted plane polarized beam is pre-rotated in transmitter 9, the radar returns in receiver 13 are mathematically adjusted in signal formatting 14, 15 to compensate for just the pre-rotated angle, to produce data streams on downlink 16 uncontaminated by the Faraday Rotation. The Faraday Rotation may be estimated by external means 11, 12, or by performing correlation 10 of the orthogonally polarized radar returns to establish a minimum, while the pre-rotation angle and mathematical correction of the returns are being iteratively adjusted, at which Faraday Rotation is assumed to be compensated.
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