CYGNSS Level 1 Full Delay Doppler Map Data Record Version 3.0
(CYGNSS_L1_FULL_DDM_V3.0)Version | 3.0 |
Processing Level | 1 |
Start/Stop Date | 2018-Aug-06 to Present |
Short Name | CYGNSS_L1_FULL_DDM_V3.0 |
Description | This Level 1 (L1) dataset contains the Version 3.0 (v3.0) 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. This version supersedes the Full DDM Version 1.0 (https://doi.org/10.5067/CYGNS-L1FDD) for data retrieved during or after August 2018. For data retrieved prior to August 2018, users will need to continue using the Full DDM Version 1.0. This version links the Full DDMs to the CYGNSS v3.0 L1 files (https://doi.org/10.5067/CYGNS-L1X30) whereas the version 1.0 Full DDM linked the Full DDMs to the CYGNSS v2.1 L1 files (https://doi.org/10.5067/CYGNS-L1X21). The calibration of the Full DDMs has not been modified for this release. |
DOI | 10.5067/CYGNS-L1F30 |
Measurement | SPECTRAL/ENGINEERING > RADAR > SENSOR COUNTS |
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-Nov-30 Resource: https://cygnss.engin.umich.edu/ |
Format | netCDF-4 |
Keyword(s) | cygnss, full, ddm, full ddm, doppler, delay doppler, delay, specular point, bistatic, bi-static, radar, v3.0, v3, 3.0, version 3, version 3.0 |
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Resolution Spatial Resolution: 25000 Meters x 25000 Meters Temporal Resolution: Hourly - < Daily 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: 2018-Aug-06 to Present Granule Time Span: 2018-Aug-06 to 2023-Oct-26Swath Width: 1 km Projection Projection Type: Satellite native along-track Projection Detail: Geolocation information included for each pixel Ellipsoid: WGS 84 |
DIRECT ACCESS | |
Browse Granule Listing | |
Search Granules | |
DIRECT S3-ACCESS | |
Available for access in-region with AWS Cloud | |
Region | |
us-west-2 | |
podaac-ops-cumulus-protected/CYGNSS_L1_FULL_DDM_V3.0/ | |
podaac-ops-cumulus-public/CYGNSS_L1_FULL_DDM_V3.0/ | |
AWS S3 Credentials | |
Get AWS S3 Credentials | Documentation | |
READ SOFTWARE | |
C Source code for Makefile build to process Full DDMs |
USER'S GUIDE | |
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GENERAL DOCUMENTATION | |
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ANOMALIES | |
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DATA RECIPE | |
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PUBLICATIONS | |
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DATA CITATION POLICY | |
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Citation is critically important for dataset documentation and discovery. Please cite the data as follows, and cite the reference papers when it is appropriate.
Citation | CYGNSS. 2020. CYGNSS Level 1 Full Delay Doppler Map Data Record Version 3.0. Ver. 3.0. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/CYGNS-L1F30
For more information see Data Citations and Acknowledgments.
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Journal Reference | Gleason, S., C. S. Ruf, A. O'Brien, D. S. McKague. 2018. The CYGNSS Level 1 Calibration Algorithm and Error Analysis Based On On-Orbit Measurements, IEEE J. Sel. Topics Appl. Earth Obs. Remote Sens, 12, 1. 10.1109/JSTARS.2018.2832981 |
Version | Dataset | Version Date | Status | |
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3.0 | CYGNSS Level 1 Full Delay Doppler Map Data Record Version 3.0 | 2022-04-11 | ACTIVE | 2022-04-11T17:14:00.000Z |
1.0 | CYGNSS Level 1 Full Delay Doppler Map Data Record | 2021-06-23 | ACTIVE | 2021-06-23T18:03:00.000Z |