CYGNSS Level 1 Calibrated Raw IF Version 1.0
(CYGNSS_L1_CAL_RAW_IF_V1.0)| Version | 1.0 |
| Processing Level | 1 |
| Start/Stop Date | 2018-Aug-01 to Present |
| Short Name | CYGNSS_L1_CAL_RAW_IF_V1.0 |
| Description | The CYGNSS Level 1 Calibrated Raw IF Version 1.0 dataset is produced by the CYGNSS Science Team of the University of Michigan, and it contains the first release, Version 1.0, of the CYGNSS Calibrated Raw Intermediate Frequency (IF) based L1 Product. CYGNSS was launched on 15 December 2016, it is a NASA Earth System Science Pathfinder Mission that was launched with the purpose of collecting the first frequent space‐based measurements of surface wind speeds in the inner core of tropical cyclones. Originally made up of a constellation of eight micro-satellites, the observatories provide nearly gap-free Earth coverage using an orbital inclination of approximately 35° from the equator, with a mean (i.e., average) revisit time of seven hours and a median revisit time of three hours.
This product includes several established signal coherence detectors, including the power-ratio Pratio, complex zero-Doppler delay waveform and full entropy Efull, and a novel fast entropy detector Efast. Both entropy detectors are provided with two temporal resolutions: 2 ms and 50 ms. Several scattered signal strength products are included: Signal-to-Noise Ratio SNR, reflected power Pg, reflectivity Γ, and Normalized Bistatic Radar Cross-Section NBRCS. Each of these products is derived using a coherent integration time of Tc = 1 ms and incoherent integration times of Ninc = 1000, 500, 250, 100, 50, and 2 ms. Signal strength time series at the shorter (2 and 50 ms) times provides excellent detection of land-water transitions in heterogeneous scenes. Delay Doppler Maps (DDMs) are also generated with high delay (∆τ = 1/16 chip) and Doppler (∆f= 50 Hz) resolution. This suite of coherence detection methods can be used to detect the presence of small inland water bodies. |
| DOI | 10.5067/CYGNS-L1R10 |
| Measurement | SPECTRAL/ENGINEERING > RADAR > SENSOR COUNTS |
| Swath Width | 25 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: 2024-Jun-28 Resource: https://cygnss.engin.umich.edu/ |
| Format | netCDF |
| Keyword(s) | cygnss, raw, raw if, if, raw intermediate frequency, doppler, delay doppler, delay, specular point, bistatic, bi-static, radar, high spatial resolution, calibrated high delay and Doppler resolution ddms, coherent detectors, full entropy, fast entropy, power ratio, in-phase and quadrature components, signal phase, reflectivity, nbrcs, inland waters, wetlands |
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Resolution Spatial Resolution: 1000 Meters x 1000 Meters Temporal Resolution: Hourly - < Daily Coverage Region: GLOBAL Region: TROPICS North Bounding Coordinate: 38.15 degrees South Bounding Coordinate: -38.15 degrees West Bounding Coordinate: -180 degrees East Bounding Coordinate: 180 degrees Time Span: 2018-Aug-01 to Present Granule Time Span: 2017-Feb-19 to 2025-Jan-25Swath Width: 25 km Projection Projection Type: Satellite native along-track Projection Detail: Geolocation information included for each pixel Ellipsoid: WGS 84 |
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| This dataset can be downloaded using the podaac-data-subscriber (the recommended tool for bulk downloading PO.DAAC data). It is a Python package for downloading one or many files using the command line interface. The URL redirects to the data-subscriber home page with instructions for utilizing the tool | |
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| us-west-2 | |
| podaac-ops-cumulus-protected/CYGNSS_L1_CAL_RAW_IF_V1.0/ | |
| podaac-ops-cumulus-public/CYGNSS_L1_CAL_RAW_IF_V1.0/ | |
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| Name | Long Name | Unit |
|---|---|---|
| add_range_to_sp | Additional range to specular point at DDM sample time | 1 |
| add_range_to_sp_pvt | Additional range to specular point at PVT time | 1 |
| att_timestamp_gps_sec | Attitude timestamp - GPS Seconds | second |
| att_timestamp_gps_week | Attitude timestamp - GPS Week | week |
| att_timestamp_utc | Attitude timestamp - UTC | seconds since 2024-01-03 19:09:46.699996840 |
| bb_nearest | Time to most recent black body reading | second |
| bb_power_temperature_density | Black Body Power Temperature Density | Counts/Kelvin |
| bit_null_offset_port | Port bit count null offset | 1 |
| bit_null_offset_starboard | Starboard bit count null offset | 1 |
| bit_null_offset_zenith | Zenith bit count null offset | 1 |
| bit_ratio_lo_hi_port | Port low/high bit counter ratio | 1 |
| bit_ratio_lo_hi_starboard | Starboard low/high bit counter ratio | 1 |
| bit_ratio_lo_hi_zenith | Zenith low/high bit counter ratio | 1 |
| brcs | DDM bin bistatic radar cross section | meter2 |
| brcs_ddm_peak_bin_delay_row | BRCS DDM peak bin delay row | 1 |
| brcs_ddm_peak_bin_dopp_col | BRCS DDM peak bin Doppler column | 1 |
| brcs_ddm_sp_bin_delay_row | BRCS DDM specular point bin delay row | 1 |
| brcs_ddm_sp_bin_dopp_col | BRCS DDM specular point bin Doppler column | 1 |
| code_phase_comp_ddm_center_row | Code Phase Comp DDM Center Row | |
| coherency_ratio | Coherency Ratio | 1 |
| commanded_sc_roll | Commanded spacecraft attitude roll angle | radian |
| comp_ddm_sp_delay_row | Compressed DDM specular point bin delay row | 1 |
| comp_ddm_sp_doppler_col | Compressed DDM specular point bin Doppler column | 1 |
| ddm | DDM reflectometry channel | 1 |
| ddm_ant | DDM Antenna | |
| ddm_brcs_uncert | DDM BRCS uncertainty | 1 |
| ddm_end_time_offset | DDM end time offset | 1e-9 s |
| ddm_kurtosis | DDM kurtosis | 1 |
| ddm_les | Leading edge slope | 1 |
| ddm_nbrcs_center | DDM NBRCS calculated from the central bin | 1 |
| ddm_noise_floor | DDM noise floor | 1 |
| ddm_noise_floor_corrected | DDM noise floor corrected | 1 |
| ddm_snr | DDM signal to noise ratio | dB |
| ddm_source | Level 0 data source | |
| ddm_time_type_selector | DDM sample time type selector | |
| ddm_timestamp_gps_sec | DDM sample timestamp - GPS Seconds | second |
| ddm_timestamp_gps_sec_one_ms | DDM sample timestamp - GPS Seconds | second |
| ddm_timestamp_gps_week | DDM sample timestamp - GPS Week | week |
| ddm_timestamp_gps_week_one_ms | DDM sample timestamp - GPS Week | week |
| ddm_timestamp_utc | DDM sample timestamp - UTC | seconds since 2024-01-03 19:09:46.699996840 |
| ddmi_tracker_delay_center | DDMI Tracker Delay Center | |
| delay_resolution | DDM delay bin resolution | 1 |
| dopp_resolution | DDM Doppler bin resolution | s-1 |
| doppler_comp_ddm_center_col | Doppler Comp DDM Center Column | |
| eff_scatter | DDM bin effective scattering area | meter2 |
| fast_entropy | Fast entropy | 1 |
| fresnel_coeff | Fresnel power reflection coefficient at specular point | 1 |
| fsw_comp_delay_shift | Flight software DDM compression delay shift | 1 |
| fsw_comp_dopp_shift | Flight software DDM compression Doppler shift | s-1 |
| full_entropy | Full entropy | 1 |
| gps_ant_gain_db_i | GPS SV transmit antenna gain | dBi |
| gps_eirp | GPS effective isotropic radiated power | watt |
| gps_off_boresight_angle_deg | GPS off boresight angle | degree |
| gps_tx_power_db_w | GPS SV transmit power | dBW |
| i_max | In-phase | 1 |
| inst_gain | Instrument gain | 1 |
| iq_imag | Quadrature waveform | 1 |
| iq_real | In-phase waveform | 1 |
| land_reflectivity | Peak linear reflectivity | linear |
| land_reflectivity_peak | Peak linear reflectivity | linear |
| les_scatter_area | LES scattering area | meter2 |
| lna_noise_figure | LNA noise figure | dB |
| lna_temp_nadir_port | Port Antenna LNA temperature | degree_Celsius |
| lna_temp_nadir_starboard | Starboard antenna LNA temperature | degree_Celsius |
| lna_temp_zenith | Zenith Antenna LNA temperature | degree_Celsius |
| modis_land_cover | MODIS Land Cover classification | |
| nbrcs_scatter_area | NBRCS scattering area | meter2 |
| noise_correction | DDM noise floor correction factor | 1 |
| nst_att_status | NST attitude status | |
| peak_brcs | Value of Peak BRCS Bin | meter2 |
| peak_nbrcs | Normalized BRCS | 1 |
| pekel_sp_water_flag | Water found at SP? | |
| pekel_sp_water_flag_10km | Water found within 10km of SP? | |
| pekel_sp_water_flag_2km | Water found within 2km of SP? | |
| pekel_sp_water_flag_5km | Water found within 5km of SP? | |
| pekel_sp_water_local_map_5km | Local area map of the water mask | |
| pekel_sp_water_percentage | Percentage of water at SP | percent |
| pekel_sp_water_percentage_10km | Percentage of water within 10km of SP | percent |
| pekel_sp_water_percentage_2km | Percentage of water within 2km of SP | percent |
| pekel_sp_water_percentage_5km | Percentage of water within 5km of SP | percent |
| phase_der | Phase derivative | degree |
| port_gain_setting | The Nadir-Port Gain Setting | dB |
| power_analog | DDM bin analog power | watt |
| prn_code | GPS PRN code | 1 |
| prn_fig_of_merit | PRN selection figure of Merit | 1 |
| pvt_timestamp_gps_sec | PVT timestamp - GPS Seconds | second |
| pvt_timestamp_gps_week | PVT timestamp - GPS Week | week |
| pvt_timestamp_utc | PVT timestamp - UTC | seconds since 2024-01-03 19:09:46.699996840 |
| q_max | Quadrature | 1 |
| quality_flags | Per-DDM quality flags 1 | |
| quality_flags_2 | Per-DDM quality flags 2 | |
| raw_counts | DDM bin raw counts | 1 |
| rx_clk_bias | GPS receiver clock bias | meter |
| rx_clk_bias_pvt | GPS receiver clock bias at PVT time | meter |
| rx_clk_bias_rate | GPS receiver clock bias rate | meter s-1 |
| rx_clk_bias_rate_pvt | GPS receiver clock bias rate at PVT time | meter s-1 |
| rx_clk_doppler | Rx Clock Doppler | |
| rx_to_sp_range | Rx to specular point range | meter |
| sample | Sample index | 1 |
| sc_alt | Spacecraft altitude | meter |
| sc_lat | Sub-satellite point latitude | degrees_north |
| sc_lon | Sub-satellite point longitude | degrees_east |
| sc_pitch | Spacecraft attitude pitch angle at DDM sample time | radian |
| sc_pitch_att | Spacecraft attitude pitch angle at attitude time | radian |
| sc_pos_x | Spacecraft position X at DDM sample time | meter |
| sc_pos_x_pvt | Spacecraft position X at PVT time | meter |
| sc_pos_y | Spacecraft position Y at DDM sample time | meter |
| sc_pos_y_pvt | Spacecraft position Y at PVT time | meter |
| sc_pos_z | Spacecraft position Z at DDM sample time | meter |
| sc_pos_z_pvt | Spacecraft position Z at PVT time | meter |
| sc_roll | Spacecraft attitude roll angle at DDM sample time | radian |
| sc_roll_att | Spacecraft attitude roll angle at attitude time | radian |
| sc_vel_x | Spacecraft velocity X at DDM sample time | meter s-1 |
| sc_vel_x_pvt | Spacecraft velocity X at PVT time | meter s-1 |
| sc_vel_y | Spacecraft velocity Y at DDM sample time | meter s-1 |
| sc_vel_y_pvt | Spacecraft velocity Y at PVT time | meter s-1 |
| sc_vel_z | Spacecraft velocity Z at DDM sample time | meter s-1 |
| sc_vel_z_pvt | Spacecraft velocity Z at PVT time | meter s-1 |
| sc_yaw | Spacecraft attitude yaw angle at DDM sample time | radian |
| sc_yaw_att | Spacecraft attitude yaw angle at attitude time | radian |
| sp_alt | Specular point altitude | meter |
| sp_az_body | Specular point body frame azimuth angle | degree |
| sp_az_orbit | Specular point orbit frame azimuth angle | degree |
| sp_calc_method | Specular point calculation method | |
| sp_code_phase | SP Code Phase | |
| sp_ddmi_delay_correction | Correction to DDMI specular point delay | 1 |
| sp_ddmi_dopp | DDMI Doppler at specular point | s-1 |
| sp_ddmi_dopp_correction | Correction to DDMI specular point Doppler | s-1 |
| sp_delay_error | Flight software specular point delay error | 1 |
| sp_dopp_error | Flight software specular point Doppler error | s-1 |
| sp_doppler | SP Doppler | Hz |
| sp_fsw_delay | Flight software specular point delay | 1 |
| sp_inc_angle | Specular point incidence angle | degree |
| sp_land_confidence | Confidence in land specular point | |
| sp_land_valid | Is land SP valid? | |
| sp_lat | Specular point latitude | degrees_north |
| sp_lat_one_ms | Specular point latitude | degrees_north |
| sp_lon | Specular point longitude | degrees_east |
| sp_lon_one_ms | Specular point longitude | degrees_east |
| sp_pos_x | Specular point position X | meter |
| sp_pos_y | Specular point position Y | meter |
| sp_pos_z | Specular point position Z | meter |
| sp_rx_gain | Specular point Rx antenna gain | dBi |
| sp_theta_body | Specular point body frame theta angle | degree |
| sp_theta_orbit | Specular point orbit frame theta angle | degree |
| sp_vel_x | Specular point velocity X | meter s-1 |
| sp_vel_y | Specular point velocity Y | meter s-1 |
| sp_vel_z | Specular point velocity Z | meter s-1 |
| spacecraft_id | CCSDS spacecraft identifier | 1 |
| spacecraft_num | CYGNSS spacecraft number | 1 |
| srtm_dem_alt | SRTM DEM altitude | meter |
| srtm_slope | SRTM DEM slope | degree |
| starboard_gain_setting | The Nadir-Starboard Gain Setting | dB |
| static_gps_eirp | Static GPS effective isotropic radiated power | watt |
| status_flags_one_hz | 1 Hz Status Flags | |
| surface_water_percentage | Percentage of surface water | percent |
| sv_num | GPS Space Vehicle Number | 1 |
| track_id | DDM Track ID | 1 |
| tx_clk_bias | GPS transmitter clock bias | meter |
| tx_pos_x | GPS Tx position X | meter |
| tx_pos_y | GPS Tx position Y | meter |
| tx_pos_z | GPS Tx position Z | meter |
| tx_to_sp_range | Tx to specular point range | meter |
| tx_vel_x | GPS Tx velocity X | meter s-1 |
| tx_vel_y | GPS Tx velocity Y | meter s-1 |
| tx_vel_z | GPS Tx velocity Z | meter s-1 |
| zenith_code_phase | Zenith signal code phase | 1 |
| zenith_sig_i2q2 | Zenith Signal I2Q2 | 1 |
| zenith_sig_i2q2_add_correction | Zenith Signal I2 Q2 additive correction factor | 1 |
| zenith_sig_i2q2_corrected | Zenith Signal I2Q2 Corrected | 1 |
| zenith_sig_i2q2_mult_correction | Zenith Signal I2Q2 Multiplicative Correction Factor | 1 |
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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. 2024. CYGNSS Level 1 Calibrated Raw IF Version 1.0. Ver. 1.0. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/CYGNS-L1R10
For more information see Data Citations and Acknowledgments.
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| Journal Reference | Gleason, S., Ruf, C. S., O'Brien, A. J., McKague, D. S. . 2019. The CYGNSS Level 1 Calibration Algorithm and Error Analysis Based On On-Orbit Measurements., IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 12, 1. https://doi.org//10.1109/JSTARS.2018.2832981 H. Carreno-Luengo, C. S. Ruf, S. Gleason and A. Russel. 2023. A New Multiresolution CYGNSS Data Product for Fully and Partially Coherent Scattering, IEEE Transactions on Geoscience and Remote Sensing, 61, Art no. 4408118. https://doi.org//10.1109/TGRS.2023.3318639 |
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