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Reference.org
Radio occultation
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<p>Radio occultation (RO) is a <a href="/facts/Remote_sensing/pj2crmGs">remote sensing</a> technique used for measuring the physical properties of a planetary <a href="/facts/Atmosphere/oUpLaGRF">atmosphere</a> or <a href="/facts/Ring_system_(astronomy)/KNCgIIX7">ring system</a>. Satellites carrying onboard GNSS-Radio occultation instruments include <a href="/facts/CHAMP_(satellite)/u7GofmYl">CHAMP</a>, <a href="/facts/GRACE_and_GRACE-FO/FaqC42jK">GRACE and GRACE-FO</a>, <a href="/facts/MetOp/XnNqvSSu">MetOp</a> and the recently launched <a href="/facts/COSMIC-2/0MCdtm2R">COSMIC-2</a>. </p>