DocumentCode :
2905379
Title :
A rotating, range-gated, fanbeam spaceborne scatterometer concept
Author :
Lin, C.-C. ; Wilson, J. ; Impagnatiello, F. ; Park, P.S.
Author_Institution :
APP/JPE, Eur. Space Res. & Technol. Centre, Noordwijk, Netherlands
Volume :
1
fYear :
1999
fDate :
1999
Firstpage :
431
Abstract :
A new, simple scatterometer concept combines the advantages of both the fixed, multiple beam, side-looking radar such as AMI-Wind (ERS-1/2) and NSCAT (ADEOS), and the conically scanning pencil-beam radar such as SeaWinds. A wide, fanbeam antenna is rotated around a vertical axis with a slow rotation rate. For a satellite at an altitude of 725 km, the antenna footprint sweeps a circular donut of 1500 km diameter. Such a slow conical scan combined with the motion of the satellite at ~7 km/s ground-speed results in highly overlapping successive sweeps such that an image pixel is revisited up to 10 times during an overpass. The pixels in the radial direction are resolved by range-gating the radar echo. Depending on the across-track position of the imaged pixel, the measurement acquisitions during an overpass consist of a set of σ0 at different combinations of the azimuth and incidence angles. A preliminary optimisation of the system resulted in a C-band radar concept with a 15 km multiple-look spatial resolution and global coverage in two days. A sketch of the developed concept, preliminary system design and predicted performance are described
Keywords :
spaceborne radar; C-band radar; across track position; antenna footprint; global coverage; measurement acquisition; multiple-look spatial resolution; overlapping successive sweeps; radar echo range gating; rotating range-gated fanbeam spaceborne scatterometer; rotation rate; satellite ground speed; satellite motion; slow conical scan; system design; wide fanbeam antenna; Azimuth; Pixel; Position measurement; Radar antennas; Radar imaging; Radar measurements; Radar scattering; Satellite antennas; Spaceborne radar; Spatial resolution;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Geoscience and Remote Sensing Symposium, 1999. IGARSS '99 Proceedings. IEEE 1999 International
Conference_Location :
Hamburg
Print_ISBN :
0-7803-5207-6
Type :
conf
DOI :
10.1109/IGARSS.1999.773523
Filename :
773523
Link To Document :
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