CYGNSS Level 1 Full Delay Doppler Map Data Record

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DOI	10.5067/CYGNS-L1FDD
Short Name	CYGNSS_L1_FULL_DDM
Description	This Level 1 (L1) dataset contains the Full Delay Doppler Map (DDM) sensor data from the Delay Doppler Mapping Instrument aboard the CYGNSS satellite constellation. The primary CYGNSS instrument, also known as the Delay-Doppler Mapping Instrument (DDMI), measures the incoming radio frequency (RF) streams from three input antenna channels (2 nadir oriented science antennas and one zenith oriented navigation antenna) and processes them in real time into DDMs, which are two-dimensional maps of the signal scattered from the Earth surface as a function of propagation time delay and Doppler frequency shift. DDMs are normally sampled over a restricted range of delay and Doppler values centered on the values at the specular point of reflection. The bit resolution of scattered signal strength is also truncated by a lossy data compression algorithm. Full DDMs are sampled over a wider range of delay and Doppler values and retain their full (lossless) bit resolution. Full DDM data records are typically 10-15 min in duration and are initiated by ground commands to coincide with an overpass by one of the spacecraft of a target area of interest.
Version	1.0
Dataset Type	ACTIVE
Measurement	SPECTRAL/ENGINEERING > RADAR > SENSOR COUNTS
Processing Level	1
Coverage	Region: GLOBAL North Bounding Coordinate: 40 degrees South Bounding Coordinate: -40 degrees West Bounding Coordinate: -180 degrees East Bounding Coordinate: 180 degrees Time Span: 2017-Aug-19 to Present Granule Time Span: 2017-Aug-19 to 2020-Nov-17
Resolution	Spatial Resolution: 25 km (Along) x 25 km (Across)
Projection	Projection Type: Satellite native along-track Projection Detail: Geolocation information included for each pixel Ellipsoid: WGS 84
Swath Width	1 km
Platform/Sensor	CYGNSS Platform Name: Cyclone Global Navigation Satellite System (CYGNSS) Orbit Period: 94.0 minutes Inclination Angle: 35.0 degrees / DDMI SENSOR Name: Delay Doppler Mapping Instrument (DDMI) Swath Width: 25.0 kilometers Description: Spacecraft angular distance from orbital plane relative to the Equator.
Project	Cyclone Global Navigation Satellite System (CYGNSS)
Data Provider	Publisher: PO.DAAC Creator: CYGNSS Release Place: PO.DAAC Release Date: 2020-Aug-21 Resource: http://clasp-research.engin.umich.edu/missions/cygnss/
Keyword(s)	cygnss, full, ddm, full ddm, doppler, delay doppler, delay, specular point, bistatic, bi-static, radar

Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov

Direct Access
PO.DAAC DRIVE	https://podaac-tools.jpl.nasa.gov/drive/files/allData/cygnss/L1/full_ddm PO.DAAC Drive
OPENDAP DATA	https://podaac-opendap.jpl.nasa.gov/opendap/allData/cygnss/L1/full_ddm/ The OPeNDAP base directory location for the collection.
Format (Compression)	NETCDF
Tools and Services
https://podaac.jpl.nasa.gov/ws/search/granule?datasetId=PODAAC-CYGNS-L1FDD&itemsPerPage=100&sortBy=ascending&format=html&pretty=true Web Services: Granule Search
Read Software
https://podaac-tools.jpl.nasa.gov/drive/files/common/sw/generic_nc_readers/matlab/ MATLAB read software
https://podaac-tools.jpl.nasa.gov/drive/files/common/sw/generic_nc_readers/idl Interactive Data Language read software
https://podaac-tools.jpl.nasa.gov/drive/files/common/sw/generic_nc_readers/R/ R read software
https://podaac-tools.jpl.nasa.gov/drive/files/allData/cygnss/L1/sw/makefile_build_c C Source code for Makefile build to process Full DDMs
https://podaac-tools.jpl.nasa.gov/drive/files/common/sw/generic_nc_readers/python/ Python read software

ANOMALIES
https://podaac.jpl.nasa.gov/forum/viewtopic.php?f=16&t=1261 Forum Post Capturing Changes to CYGNSS Sampling Rate
https://podaac-tools.jpl.nasa.gov/drive/files/allData/cygnss/L1/docs/att_tables/ Updated Monthly
USER'S GUIDE
https://podaac-tools.jpl.nasa.gov/drive/files/allData/cygnss/L1/docs/148-0373_Full_DDM_netCDF_Data_Dictionary.xlsx Level 1 Full DDM netCDF Data Dictionary
https://podaac-tools.jpl.nasa.gov/drive/files/allData/cygnss/L1/docs/148-0397-1_ATBD_L1_RawIF_FullDDM.pdf Algorithm Theoretical Basis Document (ATBD) for the CYGNSS Level 1 Full DDM and Raw IF Datasets, S. Gleason, S. Musko, CYGNSS Project Document 148-0397-01, Rev 1, 22 June 2020
https://docs.google.com/spreadsheets/d/1OZ5OlQU5mnIL0_cmZhdub8dz6x4JTOTGAWqndkBptO4/edit?usp=sharing CYGNSS Targeting Information for Full DDM Data
https://podaac-tools.jpl.nasa.gov/drive/files/allData/cygnss/L1/sw/CYGNSS_DDM_Processor_MakefileBuild.pdf Describes the software workflow in processing the Full DDMs
GENERAL DOCUMENTATION
http://clasp-research.engin.umich.edu/missions/cygnss/ CYGNSS Mission Page at University of Michigan
https://clasp-research.engin.umich.edu/missions/cygnss/reference/148-0136_ATBD_L1A_DDMCalibration_Rev2_Aug2018_release.pdf Level 1A DDM Calibration Algorithm Theoretical Basis Document, S. Gleason, CYGNSS Project Document 148-0136, Rev 2, 20 Aug. 2018.
https://clasp-research.engin.umich.edu/missions/cygnss/reference/cygnss-mission/CYGNSS_Handbook_April2016.pdf Deriving Surface Winds from Tropical Cyclones
https://clasp-research.engin.umich.edu/missions/cygnss/reference/148-0137_ATBD_L1B_DDMCalibration_Rev2_Aug2018_release.pdf Level 1B DDM Calibration Algorithm Theoretical Basis Document, S. Gleason, CYGNSS Project Document 148-0137, Rev 2, 20 Aug. 2018.
PUBLICATIONS
https://journals.ametsoc.org/doi/10.1175/BAMS-D-14-00218.1 Ruf, C., R. Atlas, P. Chang, M. Clarizia, J. Garrison, S. Gleason, S. Katzberg, Z. Jelenak, J. Johnson, S. Majumdar, A. O'Brien, D. Posselt, A. Ridley, R. Rose, V. Zavorotny (2015). New Ocean Winds Satellite Mission to Probe Hurricanes and Tropical Convection. Bull. Amer. Meteor. Soc., doi:10.1175/BAMS-D-14-00218.1.
https://doi.org/10.1109/TGRS.2015.2502245 Gleason, S., C. Ruf, M. P. Clarizia, A. O'Brien, 'Calibration and Unwrapping of the Normalized Scattering Cross Section for the Cyclone Global Navigation Satellite System (CYGNSS)', IEEE Trans. Geosci. Remote Sens., doi:10.1109/TGRS.2015.2502245, 2016.
DATA CITATION POLICY
https://podaac.jpl.nasa.gov/CitingPODAAC Data Use and Citation Policy

Citation

CYGNSS. 2020. CYGNSS Level 1 Full Delay Doppler Map Data Record. Ver. 1.0. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/CYGNS-L1FDD

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For more information see Data Citations and Acknowledgments.

Journal Reference

Gleason, S., C. S. Ruf, A. O'Brien, D. S. McKague, "The CYGNSS Level 1 Calibration Algorithm and Error Analysis Based On On-Orbit Measurements", IEEE J. Sel. Topics Appl. Earth Obs. Remote Sens., doi: 10.1109/JSTARS.2018.2832981, 2018.

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Version	Dataset	Version Date	Status
3.0	CYGNSS Level 1 Full Delay Doppler Map Data Record Version 3.0	2020-11-13	ACTIVE	1605305505282
1.0	CYGNSS Level 1 Full Delay Doppler Map Data Record	2020-07-24	ACTIVE	1595628933586

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CYGNSS Level 1 Full Delay Doppler Map Data Record

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