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AssigneesDeutsches Zentrum für Luft- und Raumfahrt e.V., Friedrich-Alexander-Universität Erlangen-Nürnberg
InventorsAndreas BENEDIKTER, Marc RODRIGUEZ-CASSOLA, Gerhard KRIEGER, Alberto MOREIRA, Martin VOSSIEK
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The invention relates to a method for computer-implemented processing of SAR raw data (RD) which originate from a radar equipment flying over the earth's surface (GR) in an azimuth direction (x), wherein the SAR raw data (RD) represent radar echoes of radar pulses (RP) during a single overflight of an area of the earth's surface (GR), where the radar pulses (RP) are or were transmitted by the radar equipment and the radar echoes are or were received by the radar equipment as radar pulses reflected at the earth's surface (GR), wherein a) a first frequency range (FB1) of the Doppler spectrum (DS) with a first Doppler center frequency (fDC1) and a second frequency range (FB2) of the Doppler spectrum (DS) with a second Doppler center frequency (fDC2) are extracted from the SAR raw data (RD); b) a first SAR image (IM1) is determined from the first frequency range (FB1) and a second SAR image (IM2) is determined from the second frequency range (FB2); c) for a respective image area (IA) of a number of image areas (IA) in the first SAR image (IM1), a displacement value (Δx) is determined which indicates by how much the image content in the respective image area (IA) from the first SAR image (IM1) is displaced in azimuth direction (x) relative to the same image content in a corresponding image area (IA) from the second SAR image (IM2), wherein the respective image area (IA) and the corresponding image area (IA) represent the same surface area with respect to the azimuth direction (x) and the range direction (R); d) a snow depth (Zs) in the respective image area (IA) is determined from the displacement value (Δx).
A method for computer-implemented processing of SAR raw data (RD) originating from a radar equipment flying over the earth's surface (GR) in an azimuth direction (x), wherein the SAR raw data (RD) represent radar echoes from radar pulses (RP) during a single overflight over an area of the earth's surface (GR), wherein the radar pulses (RP) are or were transmitted by the radar equipment and the radar echoes are or were received by the radar equipment as radar pulses reflected at the earth's surface (GR), wherein the SAR raw data (RD) comprise a plurality of data samples containing a Doppler spectrum (DS), wherein a respective data sample is associated with an azimuth position along the azimuth direction (x) and a range position along a range direction (R), the range direction (R) being perpendicular to the azimuth direction, characterized in that the SAR raw data (RD) comprises a plurality of data samples containing a Doppler spectrum (DS), the respective data samples being associated with an azimuth position along the azimuth direction (x) and a range position along a range direction (R), wherein the range direction (R) being perpendicular to the azimuth direction (x), wherein
An apparatus for computer-implemented processing of SAR raw data (RD) originating from a radar equipment flying over the earth's surface (GR) in an azimuth direction (x), wherein the SAR raw data (RD) represent radar echoes from radar pulses (RP) during a single overflight over an area of the earth's surface (GR), wherein the radar pulses (RP) are or were transmitted by the radar equipment and the radar echoes are or were received by the radar equipment as radar pulses reflected at the earth's surface (GR), wherein the SAR raw data (RD) comprise a plurality of data samples containing a Doppler spectrum (DS), wherein a respective data sample is associated with an azimuth position along the azimuth direction (x) and a range position along a range direction (R), the range direction (R) being perpendicular to the azimuth direction, wherein the apparatus is configured to perform a method in which:
(canceled)
Dependencies are inferred from the claim text.