This paper points out that radars may be added easily to radiometers to provide a synergistic capability, while providing (in many cases) improved resolution within the radiometer footprint with little additional power. Moreover, modest-resolution radars without radiometers are so much simpler than focussed SARs that they can provide useful alternatives where image resolution need not be fine, such as some geologic exploration, soil-moisture measurement and mapping ocean features other than wave spectra. Modest-resolution radar systems will often require transmitter power of only milliwatts; indeed under some conditions the power required is less than that of the local oscillator of the accompanying radiometer receiver? Here we demonstrate the power requirements for different types of modest-resolution radars vs resolution, beamwidth, and antenna size. We also point out that the use of Doppler filtering permits resolution improvement in one dimension at a cost only of complexity, not of power. These systems can be used either with sidelooking or with pushbroom or forward-scanning radiometers, or in the same configurations by themselves.
Some trade-offs in modest-resolution radars for space
Einige Aspekte der Ansprueche an das Aufloesungsvermoegen von Radaranlagen fuer den Weltraum
1986
6 Seiten, 4 Bilder, 10 Quellen
Conference paper
English
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