CYGNSS Level 1 Full Delay Doppler Map Data Record
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DOI10.5067/CYGNS-L1FDD
Short NameCYGNSS_L1_FULL_DDM
DescriptionThis 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.
Version1.0
Dataset TypeOPEN
MeasurementSPECTRAL/ENGINEERING > RADAR > SENSOR COUNTS
Processing Level1
CoverageRegion: Global
Northernmost Latitude: 40 degrees
Southernmost Latitude: 40 degrees
Westernmost Longitude: 0 degrees
Easternmost Longitude: 360 degrees
Time Span: 2017-Aug-19 to Present
Granule Time Span: 2017-Aug-19 to 2020-Sep-17
ResolutionSpatial Resolution: 25 km (Along) x 25 km (Across)
ProjectionType:
Detail:
Ellipsoid: WGS 84
Latency720 hours
Swath Width1000 m
Sample Frequency4
Temporal Repeat (Nominal)7.2 Hour
Temporal Repeat (Min)2.8 Hour
Temporal Repeat (Max)24 Hour
Platform/Sensor
CYGNSS
Platform
Name: Cyclone Global Navigation Satellite System (CYGNSS)
Orbit Period: 94 minutes
Inclination Angle: 35 degrees
Ascending Node: 1970-Jan-01 00:00:00
/
DDMI
SENSOR
Name: Delay Doppler Mapping Instrument (DDMI)
Swath Width: 25 km
Description: Delay Doppler Mapping Instrument (DDMI)

ProjectCyclone Global Navigation Satellite System (CYGNSS)
Data ProviderCreator: CYGNSS
Release Place: PO.DAAC
Release Date: 2020-Aug-21
Resource: http://clasp-research.engin.umich.edu/missions/cygnss/
Keyword(s)cygnss, raw, raw if, if, intermediate frequency, doppler, delay doppler, delay, specular point, bistatic, bi-static, radar
Persistent IDPODAAC-CYGNS-L1FDD
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
User's Guide
CYGNSS DDM Processor Basics, V2https://podaac-tools.jpl.nasa.gov/drive/files/allData/cygnss/L1/sw/CYGNSS_DDM_Processor_Basics_V2.pdf
Describes the software workflow in processing the Full DDMs
Full DDM netCDF Data Dictionaryhttps://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
CYGNSS Command Log for Full DDM Datahttps://docs.google.com/spreadsheets/d/1OZ5OlQU5mnIL0_cmZhdub8dz6x4JTOTGAWqndkBptO4/edit?usp=sharing
CYGNSS Targeting Information for Full DDM Data
CYGNSS Level 1 High Resolution and Extended DDM ATBDhttps://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
Project Materials
CYGNSS Mission Pagehttp://clasp-research.engin.umich.edu/missions/cygnss/
CYGNSS Mission Page at University of Michigan
CYGNSS Algorithm Theoretical Basis Document Level 1A DDM Calibrationhttps://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.
CYGNSS Mission Pagehttps://podaac.jpl.nasa.gov/CYGNSS
CYGNSS Mission Page at University of Michigan
CYGNSS Algorithm Theoretical Basis Document Level 1B DDM Calibrationhttps://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.
NASA CYGNSS Handbookhttps://clasp-research.engin.umich.edu/missions/cygnss/reference/cygnss-mission/CYGNSS_Handbook_April2016.pdf
Deriving Surface Winds from Tropical Cyclones
Journal References
Gleason et al. 2016 (TGRS)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.
Ruf et al. 2015 (BAMS)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.
Known Issues
Spacecraft Attitude Tableshttps://podaac-tools.jpl.nasa.gov/drive/files/allData/cygnss/L1/docs/att_tables/
Updated Monthly
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.