Title of Paper: Next-Generation Spaceborne Precipitation Radar
(PR-2) Instrument and Technology
Principal Author: Dr. Eastwood Im
Abstract: Global rainfall is the primary distributor of
latent heat through atmospheric circulation. The recently launched Tropical
Rainfall Measuring Mission satellite is dedicated to advance our understanding
of tropical precipitation patterns and their implications on global climate and
its change. The Precipitation Radar (PR) aboard the satellite is the first
radar ever flown in space and has provided exciting, new data on the 3-D rain
structures for a variety of scientific uses. However, due to the limited
mission lifetime and the dynamical nature of precipitation, the TRMM PR data
acquired cannot address all the issues associated with precipitation, its related
processes, and the long-term climate variability. It is desirable for future
rainfall measuring missions, such as NASA's planned Global Precipitation
Mission (GPM) to both enhance the performance of the TRMM PR and reduce its
mass. To these ends, a system concept using a dual-frequency radar with a
deployable 5-meter electronically-scanned membrane antenna and real-time
digital signal processing has been developed. This new system, the Second
Generation Precipitation Radar (PR-2), will offer greatly enhanced capability
with a fraction of the mass of the current TRMM PR. The key PR-2 advanced
features include:
In this paper, the PR-2 instrument design and the associated technologies
will be presented.