TRMM_1B21_7
TRMM Precipitation Radar Power and Reflectivity L1B 1.5 hours V7 (TRMM_1B21) at GES DISC
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Abstract
The TRMM Precipitation Radar (PR), the first of its kind in space, is an electronically scanning radar, operating at 13.8 GHz that measures the 3-D rainfall distribution over both land and ocean, and defines the layer depth of the precipitation. The 1B21 calculates the received power at the PR receiver input point from the Level-0 count value which is linearly proportional to the logarithm of the PR receiver output power. To convert the count value to the input power, extensive internal calibrations are applied, which are mainly based upon the system model, temperature dependence of model parameters and many temperature sensors attached at various locations of the PR. Periodically the input-output characteristics are measured using an internal calibration loop for the IF unit and later receiver stages. To make an absolute calibration, an Active Radar Calibrator (ARC) is placed at Kansai Branch of CRL and overall system gain of the PR is being measured every 2 months. Using the transfer function based on the above internal and external calibrations, the PR received power is obtained. Note that the value assumes that the signal follows the Rayleigh fading, so if the fading characteristics of a scatter is different, a small bias error may occur (within 1 or 2 dB). Changes in horizontal resolution resulting from the TRMM boost that occurred on 24 August 2001: Pre-Boost (before 7 August 2001): Temporal Resolution: 91.5 min/orbit ~ 16 orbits/day; Swath Width: 215 km; Horizontal Resolution: 4.3 km Post-Boost (after 24 August 2001): Temporal Resolution: 92.5 min/orbit ~ 16 orbits/day; Swath Width: 247 km; Horizontal Resolution: 5.0 km - Search for granules from this collection
Data Identification Fields:
Data Dates
Creation | |
Last Revision |
Processing Level
1B
Quality
A Table structure (called Scan Status) is included in the HDF file, containing entries on a scan-by-scan basis.These entries include a geolocation flag and a data quality flag, indicating the percentage of pixels along each scan with values within a pre-defined range.Collection Progress
Complete
Access Constraints
None
Related URLs
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- EARTH SCIENCE
- SPECTRAL/ENGINEERING
- RADAR
- RADAR BACKSCATTER
- EARTH SCIENCE
- SPECTRAL/ENGINEERING
- RADAR
- RADAR REFLECTIVITY
Science Keywords
Other Descriptive Keywords
Ancillary Keywords
- EOSDIS
ISO Topic Categories
- GEOSCIENTIFIC INFORMATION
Acquisition Information Fields:
Platforms
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Earth Observation Satellites
TRMMInstruments
- PR
Projects
Project Short Name | Campaigns | Project Dates |
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TRMM | No campaigns listed. | No dates provided. |
Temporal Information Fields:
Spatial Information Fields:
Location Keywords
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- GEOGRAPHIC REGION
- TROPICS
Data Centers
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NASA/GSFC/SED/ESD/GCDC/GESDISC
ARCHIVERGoddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA
This data center does not have any addresses listed.
This data center does not have any contact mechanisms listed.
Data Contacts
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ANDREY SAVTCHENKO
Metadata AuthorANDREY SAVTCHENKO
Distributed Active Archive Center Global Change Data Center
Code 610.2
NASA Goddard Space Flight Center
Greenbelt, MD 20771- 301-614-5705
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GES DISC HELP DESK SUPPORT GROUP
Data Center ContactGES DISC HELP DESK SUPPORT GROUP
NASA/GSFC/SED/ESD/GCDC/GESDISC
Goddard Earth Sciences Data and Information Services Center
Code 610.2
NASA Goddard Space Flight Center
Greenbelt, MD 20771- 301-614-5224
- 301-614-5268
Collection Citations Fields:
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TRMM Precipitation Radar Power and Reflectivity L1B 1.5 hours V7
Created by: Tropical Rainfall Measuring Mission (TRMM)
Published by: Goddard Earth Sciences Data and Information Services Center (GES DISC)
Released: 2011-07-01