CYGNSS_L1_V2.1_1
PODAAC-CYGNS-L1X21
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Abstract
This Level 1 (L1) dataset contains the Version 2.1 geo-located Delay Doppler Maps (DDMs) calibrated into Power Received (Watts) and Bistatic Radar Cross Section (BRCS) expressed in units of m^2 from the Delay Doppler Mapping Instrument aboard the CYGNSS satellite constellation. This version supersedes Version 2.0. The L1 dataset contains a number of other engineering and science measurement parameters, including sets of quality flags/indicators, error estimates, and bias estimates as well as a variety of orbital, spacecraft/sensor health, timekeeping, and geolocation parameters. At most, 8 netCDF data files (each file corresponding to a unique spacecraft in the CYGNSS constellation) are provided each day; under nominal conditions, there are typically 6-8 spacecraft retrieving data each day, but this can be maximized to 8 spacecraft under special circumstances in which higher than normal retrieval frequency is needed (i.e., during tropical storms and or hurricanes). Latency is approximately 6 days (or better) from the last recorded measurement time. The Version 2.1 release represents the second science-quality release. Here is a summary of improvements that reflect the quality of the Version 2.1 data release: 1) data is now available when the CYGNSS satellites are rolled away from nadir during orbital high beta-angle periods, resulting in a significant amount of additional data; 2) correction to coordinate frames result in more accurate estimates of receiver antenna gain at the specular point; 3) improved calibration for analog-to-digital conversion results in better consistency between CYGNSS satellites measurements at nearly the same location and time; 4) improved GPS EIRP and transmit antenna pattern calibration results in significantly reduced PRN-dependence in the observables; 5) improved estimation of the location of the specular point within the DDM; 6) an altitude-dependent scattering area is used to normalize the scattering cross section (v2.0 used a simpler scattering area model that varied with incidence and azimuth angles but not altitude); 7) corrections added for noise floor-dependent biases in scattering cross section and leading edge slope of delay waveform observed in the v2.0 data. Users should also note that the receiver antenna pattern calibration is not applied per-DDM-bin in this v2.1 release. - Search for granules from this collection
Data Identification Fields:
Data Dates
Creation | |
Last Revision |
Processing Level
1
Quality
Collection Progress
Not Provided
Related URLs
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- Earth Science
- Spectral/Engineering
- Radar
- Radar Cross-section
- Bistatic Radar Cross-Section
- Earth Science
- Spectral/Engineering
- Radar
- Radar Reflectivity
- Zenith Signal Power
Science Keywords
Acquisition Information Fields:
Platforms
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SATELLITE CONSTELLATION
CYGNSSInstruments
- DDMI
Temporal Information Fields:
Spatial Information Fields:
Coverage Type | Zone Identifier | Geometry | Granule Representation |
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HORIZONTAL | CARTESIAN | CARTESIAN |
Location Keywords
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- GEOGRAPHIC REGION
- GLOBAL
Data Centers
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CYGNSS
PROCESSORThis data center does not have any addresses listed.
This data center does not have any contact mechanisms listed.
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PO.DAAC
ARCHIVERThis data center does not have any addresses listed.
This data center does not have any contact mechanisms listed.
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Cyclone Global Navigation Satellite System
ARCHIVERThis data center does not have any addresses listed.
- 734-936-3105
Data Contacts
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Tim Butler
Technical ContactTim Butler
Cyclone Global Navigation Satellite System
This contact does not have any addresses listed.
This contact does not have any contact mechanisms listed.