GPM PR on TRMM Echo Power L1B 1.5 hours 5 km V07 (GPM_1BPR) at GES DISC

Description

This is the new (GPM-formated) TRMM product. It replaces the old TRMM_1B21,1C21 Version 07 is the current version of the data set. Previous versions have been superseded by Version 07. 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

Resources

Name Format Description Link
21 Use the Earthdata Search to find and retrieve data sets across multiple data centers. https://search.earthdata.nasa.gov/search?q=GPM_1BPR
21 Access the data via HTTPS https://disc2.gesdisc.eosdis.nasa.gov/data/TRMM_L1/GPM_1BPR.07
21 Search results for publications that cite this dataset by its DOI. https://scholar.google.com/scholar?q=10.5067%2FGPM%2FPR%2FTRMM%2F1B%2F07
33 TRMM Precipitation Radar Instruction Manual (provided by JAXA) https://www.eorc.jaxa.jp/TRMM/documents/PR_algorithm_product_information/pr_manual/PR_Instruction_Manual_V7_L1.pdf
21 Access the dataset landing page from the GES DISC website. https://disc.gsfc.nasa.gov/datacollection/GPM_1BPR_07.html
34 GPM_1BPR.png https://docserver.gesdisc.eosdis.nasa.gov/public/project/GPM/browse/GPM_1BPR.png
21 TRMM Project Home Page https://gpm.nasa.gov
33 FILE SPECIFICATION DOCUMENT https://gpmweb2https.pps.eosdis.nasa.gov/pub/GPMfilespec/filespec.GPM.pdf
33 Comparison between TRMM versions 6 and 7. https://pps.gsfc.nasa.gov/Documents/formatChangesV7.pdf
33 README Document https://docserver.gesdisc.eosdis.nasa.gov/public/project/GPM/README.TRMM.pdf
21 TRMM Data Gaps https://gpmweb2https.pps.eosdis.nasa.gov/tsdis/AB/docs/anomalous.html
21 Access the data via the OPeNDAP protocol. https://disc2.gesdisc.eosdis.nasa.gov/opendap/TRMM_L1/GPM_1BPR.07/

Tags

  • spectral-engineering
  • radar
  • earth-science

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