Metadata Updated: August 1, 2018

This Level 1 (L1) dataset contains the Version 2.0 geo-located Delay Doppler Maps (DDMs) calibrated into Power Received (Watts) and Bistatic Radar Cross Section (BRCS) expressed in units of m^2 from the Delay Doppler Mapping Instrument aboard the CYGNSS satellite constellation. This version supersedes Version 1.1. The L1 dataset contains a number of other engineering and science measurement parameters, including sets of quality flags/indicators, error estimates, and bias estimates as well as a variety of orbital, spacecraft/sensor health, timekeeping, and geolocation parameters. At most, 8 netCDF data files (each file corresponding to a unique spacecraft in the CYGNSS constellation) are provided each day; under nominal conditions, there are typically 6-8 spacecraft retrieving data each day, but this can be maximized to 8 spacecraft under special circumstances in which higher than normal retrieval frequency is needed (i.e., during tropical storms and or hurricanes). Latency is approximately 6 days (or better) from the last recorded measurement time. The Version 2.0 release represents the first science-quality release that has moved beyond the previous "Provisional" releases (i.e., Version 1.0 and 1.1). Here is a summary of improvements that reflect the quality of the Version 2.0 data release: 1) more accurate estimates of the transmitter power of each GPS satellite; 2) more accurate estimates of the transmitter antenna radiation patterns of each GPS satellite; 3) more accurate determination of the delay and Doppler coordinates of the specular point in each DDM; 4) Correction for variations in the GPS antenna gain pattern across the DDM (v1.1 assumed the gain at the specular point for all parts of the DDM); 5) Correction for variations in the GPS signal propagation range with altitude of the CYGNSS satellites (v1.1 assumed a constant range consistent with the average orbit altitude); 6) more accurate determination of the receiver antenna radiation patterns on the port and starboard side of each CYGNSS satellite; 7) better quality control flagging for increased uncertainty in CYGNSS satellite attitude knowledge during start tracker sun outages.

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Created Date August 1, 2018
Metadata Updated Date August 1, 2018

Metadata Source

Harvested from NASA Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date August 1, 2018
Metadata Updated Date August 1, 2018
Publisher PO.DAAC
Unique Identifier C1444741700-PODAAC
Tim Butler
Maintainer Email
Public Access Level public
Bureau Code 026:00
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Harvest Object Id cb2b85f1-5a63-440c-8f44-e8af4ab6dc08
Harvest Source Id 39e4ad2a-47ca-4507-8258-852babd0fd99
Harvest Source Title NASA Data.json
Data First Published 2017-10-27T03:20:35.972Z
Language en-US
Metadata Type geospatial
Data Last Modified 2017-10-27T03:20:35.972Z
Program Code 026:001
Publisher Hierarchy U.S. Government > National Aeronautics and Space Administration > PO.DAAC
Related Documents ftp://podaac-ftp.jpl.nasa.gov/allData/cygnss/L1/v2.0, https://podaac-opendap.jpl.nasa.gov/opendap/allData/cygnss/L1/v2.0/, ftp://podaac.jpl.nasa.gov/common/sw/generic_nc_readers/matlab/, ftp://podaac.jpl.nasa.gov/common/sw/generic_nc_readers/R/, ftp://podaac.jpl.nasa.gov/common/sw/generic_nc_readers/python/, http://clasp-research.engin.umich.edu/missions/cygnss/, http://clasp-research.engin.umich.edu/missions/cygnss/reference/ATBD%20L1A%20DDM%20Calibration%20R1.pdf, http://clasp-research.engin.umich.edu/missions/cygnss/reference/cygnss-mission/CYGNSS_Handbook_April2016.pdf, http://clasp-research.engin.umich.edu/missions/cygnss/reference/ATBD%20L1B%20DDM%20Calibration%20R1.pdf, ftp://podaac.jpl.nasa.gov/common/sw/generic_nc_readers/idl
Source Datajson Identifier True
Source Hash a117fdb9f45da3f5a7ac6473760498d9647f6bbc
Source Schema Version 1.1
Spatial -180.0 40.0 180.0 40.0
Temporal 2017-03-18T00:00:00Z/2018-04-04T00:00:00Z
Category geospatial

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