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spacer.gifsub_directry_end.gifTRMM
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spacer.gifsub_directry.gifTRMM-PR
spacer.gifsub_directry.gifTRMM-VIRS
spacer.gifsub_directry.gifTRMM-TMI
spacer.gifsub_directry.gifTRMM-CERES
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PR Product

Concept
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PR Image

Overview

The Precipitation Radar (PR) onboard TRMM is the first spaceborne rain radar in the world, and was developed by JAXA(Old:NASDA) in cooperation with NICT(Old:CRL).
Major objectives of PR are;(1) to provide 3-dimensional rainfall structure, (2) to achieve quantitative rainfall measurement over land as well as the oceans, and (3) to improve the accuracy of TRMM Microwave Imager (TMI) measurement by providing the rain structure information.


Characteristic

System Parameters
Radar Type Active Phased-array Radar
Frequency 13.796 GHz and 13.802 GHz
(Two-channel frequency agility)
Swath Width About 215km
Observable Range Over 20km
Range Resolution 250km
Horizontal Resolution 4.3 km (nadir)
Sensitivity S/N per pulse >= 0 dB for 0.5 mm/h rain at rain top
Independent Samples 64
Data Rate 93.5kbps
Weight 465kg
Power 213W

Antenna
Antenna Type 128-element slotted wave guide array antenna
Beam Width 10.71deg. * 0.71deg.
Aperture 2.1m * 2.1m
Scan Angle +-17deg.
Gain About 47.4dB

Transmitter/Receiver Subsystem
Transmitter Type Solid-State Power Amplifiers (SSPAs)(* 128)
Peak Power Over 700W
Pule Width 1.6ms * 2ch.
Pulse Repetition Frequency 2776Hz
Dynamic Range About 81.5dB

Sample Images

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  • Typhoon no.28(1997.12.25)



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