CYGNSS Level 1 Full Delay Doppler Map Data Record
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.
| Science Keywords: |
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| Spatial Extent: | Bounding Rectangle: N: 40 S: -40 E: 180 W: -180 |
Data Format(s): | Distribution: NETCDF |
| Temporal Extent: | Platform(s): | CYGNSS | |
| Data Center(s): | NASA/JPL/PODAAC | Instrument(s): | DDMI |
| Version: | 1.0 | ||
- Title: CYGNSS Level 1 Full Delay Doppler Map Data Record
- Version: 1.0
- Creator: CYGNSS
- Publisher: PO.DAAC
- Release Date: 2020-08-21T00:00:00.000Z
- Other Citation Details: CYGNSS, PO.DAAC, 2020-08-21, CYGNSS Level 1 Full Delay Doppler Map Data Record, https://cygnss.engin.umich.edu/
- Linkage: https://cygnss.engin.umich.edu/
- DATA CITATION POLICY: https://podaac.jpl.nasa.gov/CitingPODAAC, Data Use and Citation Policy
10.5067/CYGNS-L1FDD
https://dx.doi.org/
- ANOMALIES: https://podaac.jpl.nasa.gov/forum/viewtopic.php?f=16&t=1261, Forum Post Capturing Changes to CYGNSS Sampling Rate
- 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
- GENERAL DOCUMENTATION: https://cygnss.engin.umich.edu/, CYGNSS Mission Page at University of Michigan
- GENERAL DOCUMENTATION: https://cygnss.engin.umich.edu/wp-content/uploads/sites/534/2021/06/CYGNSS_Handbook_April2016.pdf, Deriving Surface Winds from Tropical Cyclones
- USER'S GUIDE: 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
- GENERAL DOCUMENTATION: https://podaac-tools.jpl.nasa.gov/drive/files/allData/cygnss/L1/docs/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.
- USER'S GUIDE: https://docs.google.com/spreadsheets/d/1OZ5OlQU5mnIL0_cmZhdub8dz6x4JTOTGAWqndkBptO4/edit?usp=sharing, CYGNSS Targeting Information for Full DDM Data
- USER'S GUIDE: 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: https://podaac-tools.jpl.nasa.gov/drive/files/allData/cygnss/L1/docs/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.
- ANOMALIES: https://podaac-tools.jpl.nasa.gov/drive/files/allData/cygnss/L1/docs/att_tables/, Updated Monthly
Collection Information
Data Identification
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Processing Level
1
- Quality
-
Collection Progress
Active
-
Title: Publication reference title not provided
Data Dates
| Creation | |
| Last Revision |
Publication References
Related URLs
Other Descriptive Keywords
Ancillary Keywords
- cygnss
- full
- ddm
- full ddm
- doppler
- delay doppler
- delay
- specular point
- bistatic
- bi-static
- radar
Additional Attributes
- Name: earliest_granule_start_time DATETIME Description: Earliest Granule Start Time for dataset.
- Name: latest_granule_end_time DATETIME Description: Latest Granule Stop/End Time for dataset.
- Name: data_latency INT Description: Dataset Latency
- Name: Series Name STRING Description: Dataset citation series name
- Name: Persistent ID STRING Description: Dataset Persistent ID
Acquisition Information
Projects
| Project Short Name | Campaigns | Project Dates |
|---|---|---|
| CYGNSS | No campaigns listed. | No dates provided. |
Temporal Information
Temporal Keywords
- 7.2 Hour
Spatial Information
Generic Resolutions
Generic Resolution 1
X Dimension25000 Meters
Y Dimension25000 Meters
| Coverage Type | Zone Identifier | Geometry | Granule Representation |
|---|---|---|---|
| HORIZONTAL | CARTESIAN | CARTESIAN |
Resolution and Coordinate System
Projection Type: Satellite native along-track, Projection Detail: Geolocation information included for each pixel
Geodetic Model:
| Datum Name | Ellipsoid Name | Semi Major Axis | Flattening Ratio Denominator |
|---|---|---|---|
| World Geodetic System 1984 | WGS 84 | 6378137 | 298.2572236 |
Horizontal Data Resolution
| Coverage Type | Swath Width | Period | Inclination Angle | Number of Orbits | Start Circular Latitude | Granule Representation |
|---|---|---|---|---|---|---|
| ORBITAL | 1.0 km | 94.0 minutes | 35.0 degrees | 1 | CARTESIAN |
Spatial Information
Location Keywords
- GEOGRAPHIC REGION
- GLOBAL
- Tropics
Data Centers
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NASA/ESSP/UMICH/CYGNSS
PROCESSORThis data center does not have any addresses listed.
This data center does not have any contact mechanisms listed.
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NASA/JPL/PODAAC
ARCHIVER, DISTRIBUTORPhysical Oceanography Distributed Active Archive Center, Jet Propulsion Laboratory, NASA
This data center does not have any addresses listed.
This data center does not have any contact mechanisms listed.
Data Contacts
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Help Desk
User ServicesHelp Desk
NASA/JPL/PODAACThis contact does not have any addresses listed.
8 AM to 5 PM PT
Physical Oceanography Distributed Active Archive Center Help Page
https://podaac.jpl.nasa.gov/HELP
- Home Page
Archive And Distribution Information
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Format: NETCDF
Format Type: Native
File Distribution Information
There is no direct distribution information for this collection.