TRMM_1B21_7

TRMM Precipitation Radar Power and Reflectivity L1B 1.5 hours V7 (TRMM_1B21) at GES DISC

Version 7 eng
  • 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

Data Identification Fields:

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    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
    Science Keywords
    • EARTH SCIENCE
    • SPECTRAL/ENGINEERING
    • RADAR
    • RADAR BACKSCATTER
    • EARTH SCIENCE
    • SPECTRAL/ENGINEERING
    • RADAR
    • RADAR REFLECTIVITY
Other Descriptive Keywords
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Ancillary Keywords
  • EOSDIS
ISO Topic Categories
  • GEOSCIENTIFIC INFORMATION

Acquisition Information Fields:

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Platforms
  • Earth Observation Satellites
    TRMM
    Instruments
    • PR
Projects
Project Short Name Campaigns Project Dates
TRMM No campaigns listed. No dates provided.

Temporal Information Fields:

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Spatial Information Fields:

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Location Keywords
    • GEOGRAPHIC REGION
    • TROPICS

Data Centers

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  • NASA/GSFC/SED/ESD/GCDC/GESDISC
    ARCHIVER
    Goddard 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.

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    https://disc.gsfc.nasa.gov/
    • Home Page

Data Contacts

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  • ANDREY SAVTCHENKO
    Metadata Author
    ANDREY SAVTCHENKO

    Distributed Active Archive Center Global Change Data Center
    Code 610.2
    NASA Goddard Space Flight Center
    Greenbelt, MD 20771

  • GES DISC HELP DESK SUPPORT GROUP
    Data Center Contact
    GES 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

    • Email
    • 301-614-5224
    • 301-614-5268

Collection Citations Fields:

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    Collection Citations
Metadata Dates
Creation
Last Revision