| 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 | 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 | |
| Read Software | |
| |
| |
| ANOMALIES | |
| |
| USER'S GUIDE | |
| |
| |
| |
| |
| GENERAL DOCUMENTATION | |
| |
| |
| |
| |
| PUBLICATIONS | |
| |
| |
| DATA 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
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. | |||||||
| 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 |