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Please use this identifier to cite or link to this item:
http://hdl.handle.net/2014/42697
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| Title: | SweepSAR : beam-forming on receive using a reflector-phased array feed combination for spaceborne SAR |
| Authors: | Freeman, A.
Krieger, G.
Rosen, P.
Younis, M.
Johnson, W. T. K.
Huber, S.
Jordan, R.
Moreira, A. |
| Keywords: | synthetic aperture radars (SARs)
phased array
return echo |
| Issue Date: | 4-May-2012 |
| Publisher: | Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2012. |
| Citation: | RadarCon, Pasadena, California, May 4, 2012. |
| Abstract: | In this paper, an alternative approach is described that is suited for longer wavelength SARs in particular, employing a large, deployable reflector antenna and a much simpler phased array feed. To illuminate a wide swath, a substantial frac- tion of the phased array feed is excited on transmit to sub-illuminate the reflector. Shorter transmit pulses are required than for conventional SAR. On receive, a much smaller portion of the phased array feed is used to collect the return echo, so that a greater portion of the reflector antenna area is used. The locus of the portion of the phased array used on receive is adjusted using an analog beam steering network, to ‘sweep’ the receive beam(s) across the illuminated swath, tracking the return echo. This is similar in some respects to the whiskbroom approach to optical sensors, hence the name: SweepSAR.
SweepSAR has advantages over conventional SAR in that it requires less transmit power, and if the receive beam is nar- row enough, it is relatively immune to range ambiguities. Compared to direct radiating arrays with digital beam- forming, it is much simpler to implement, uses currently available technologies, is better suited for longer wavelength systems, and does not require extremely high data rates or onboard processing |
| URI: | http://hdl.handle.net/2014/42697 |
| Appears in Collections: | JPL TRS 1992+
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