Rongowai-CYGNSS Airborne Level 1 Science Data Record Version 1.0
(RONGOWAI_L1_SDR_V1.0)| Version | 1.0 |
| Processing Level | 1 |
| Start/Stop Date | 2022-Oct-20 to Present |
| Short Name | RONGOWAI_L1_SDR_V1.0 |
| Description | The Rongowai Level 1 Science Data Record Version 1.0 dataset is generated by the University of Auckland (UoA) Rongowai Science Payloads Operations Centre in New Zealand. This initiative is supported by NASA and the New Zealand Space Agency. The data collection process is conducted using the Next-generation receiver (NgRx) mounted on the Air New Zealand domestic aircraft Q300. This Level 1 (L1) dataset contains the Version 1.0 geo-located Delay Doppler Maps (DDMs) calibrated into Power Received (Watts) and Bistatic Radar Cross Section (BRCS) expressed in units of meters squared from the Delay Doppler Mapping Instrument onboard an Air New Zealand domestic Q300 (tail number ZK-NFA). 20 DDMs are contained within a typical L1 netcdf corresponding to 10 Left-Hand-Circularly Polarized (LHCP) and 10 Right-Hand-Circularly Polarized (RHCP) channels. Other useful scientific and engineering measurement parameters include the co- and cross-polarized Normalized Bistatic Radar Cross Section (NBRCS) of the specular point, the Leading Edge Slope (LES) of the integrated delay waveform and the normalized waveforms. The L1 dataset contains a number of other engineering and science measurement parameters, including coherence detection and a coherence state metric, sets of quality flags/indicators, error estimates, Fresnel-zone geometry estimates (and thereby the estimated per-sample spatial resolution) as well as a variety of timekeeping, and geolocation parameters. Each netCDF data files corresponds to a single flight between airports within New Zealand (flight durations typically range between 45 min and 1hr 30min with a median of 7 flights/day) and measurements are reported at 1 second increments. Latency is approximately 1 days (or better) from the last recorded measurement time. |
| DOI | 10.5067/RGOWA-S1A10 |
| Measurement | OCEANS > OCEAN WINDS > WIND VELOCITY/SPEED |
| Platform/Sensor | Airplane / Platform Name: Airplane (Airplane) DDMI SENSOR Name: Delay Doppler Mapping Instrument (DDMI) |
| Project | Cyclone Global Navigation Satellite System (CYGNSS) |
| Data Provider | Publisher: PO.DAAC Creator: Rongowai Science Payloads Operations Centre Release Place: PO.DAAC Release Date: 2024-Mar-07 |
| Format | netCDF-4 |
| Keyword(s) | L1, RONGOWAI, GNSS-R, DDM, CYGNSS, WIND,aircraft |
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Resolution Temporal Resolution: 1 second - < 1 minute Coverage North Bounding Coordinate: -34 degrees South Bounding Coordinate: -47 degrees West Bounding Coordinate: 165 degrees East Bounding Coordinate: 179 degrees Time Span: 2022-Oct-20 to Present |
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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 | |
| DIRECT S3-ACCESS | |
| Available for access in-region with AWS Cloud | |
Region | |
| us-west-2 | |
| podaac-ops-cumulus-protected/RONGOWAI_L1_SDR_V1.0/ | |
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| Name | Long Name | Unit |
|---|---|---|
| ac_alt | Aircraft altitude | meter |
| ac_heading | Aircraft attitude heading angle at DDM sample time | radian |
| ac_heading_pvt | Aircraft attitude heading angle at PVT time | radian |
| ac_lat | Sub-aircraft point latitude | degrees_north |
| ac_lon | Sub-aircraft point longitude | degrees_east |
| ac_pitch | Aircraft attitude pitch angle at DDM sample time | radian |
| ac_pitch_pvt | Aircraft attitude pitch angle at PVT time | radian |
| ac_pos_x | Aircraft position X at DDM sample time | meter |
| ac_pos_x_pvt | Aircraft position X at PVT time | meter |
| ac_pos_y | Aircraft position Y at DDM sample time | meter |
| ac_pos_y_pvt | Aircraft position Y at PVT time | meter |
| ac_pos_z | Aircraft position Z at DDM sample time | meter |
| ac_pos_z_pvt | Aircraft position Z at PVT time | meter |
| ac_roll | Aircraft attitude roll angle at DDM sample time | radian |
| ac_roll_pvt | Aircraft attitude roll angle at PVT time | radian |
| ac_vel_x | Aircraft velocity X at DDM sample time | meter s-1 |
| ac_vel_x_pvt | Aircraft velocity X at PVT time | meter s-1 |
| ac_vel_y | Aircraft velocity Y at DDM sample time | meter s-1 |
| ac_vel_y_pvt | Aircraft velocity Y at PVT time | meter s-1 |
| ac_vel_z | Aircraft velocity Z at DDM sample time | meter s-1 |
| ac_vel_z_pvt | Aircraft velocity Z at PVT time | meter s-1 |
| add_range_to_sp | Additional range to specular point at DDM sample time | |
| add_range_to_sp_pvt | Additional range to specular point at PVT time | |
| ant_temp_nadir | Nadir antenna temperature | degree_Celsius |
| ant_temp_zenith | Zenith antenna temperature | degree_Celsius |
| brcs | DDM bin bistatic radar cross section | meter2 |
| brcs_ddm_peak_bin_delay_row | BRCS DDM peak bin delay row | |
| brcs_ddm_peak_bin_dopp_col | BRCS DDM peak bin Doppler column | |
| brcs_ddm_sp_bin_delay_row | BRCS DDM specular point delay row | |
| brcs_ddm_sp_bin_dopp_col | BRCS DDM specular point Doppler column | |
| coh_int | Coherent Integration time | s-1 |
| coherence_metric | Coherence metric | |
| coherence_state | Coherence state | |
| ddm | DDM reflectometry channel | |
| ddm_ant | DDM antenna | |
| ddm_nbrcs_v1 | Normalized BRCS - SP bin | |
| ddm_noise_floor | DDM noise floor | counts |
| ddm_pvt_bias | Bias between DDM and PVT timestamps | seconds |
| ddm_snr | DDM signal to noise ratio | dB |
| ddm_snr_flag | DDM SNR flag | |
| ddm_timestamp_gps_sec | DDM sample timestamp - GPS seconds | second |
| ddm_timestamp_gps_week | DDM sample timestamp - GPS week | week |
| ddm_timestamp_utc | DDM sample timestamp - UTC | second |
| delay_resolution | DDM delay bin resolution | |
| dopp_resolution | DDM Doppler bin resolution | s-1 |
| eff_scatter | DDM bin effective scattering area | meter2 |
| fresnel_coeff | Fresnel power reflection coefficient at specular point | |
| fresnel_major | Fresnel zone major axis | meter |
| fresnel_minor | Fresnel zone minor axis | meter |
| fresnel_orientation | Fresnel zone direction | degree |
| gps_ant_gain_db_i | GPS SV transmit antenna gain | dBi |
| gps_off_boresight_angle_deg | GPS off boresight angle | degree |
| gps_tx_power_db_w | GPS SV transmit power | dbW |
| inst_gain | Instrument gain | |
| L1a_power_calibration_flag | L1a power calibration flag | |
| L1a_power_ddm | DDM bin power | watt |
| L1a_xpol_calibration_flag | L1a cross-pol calibration flag | |
| lna_noise_figure | LNA noise figure | dB |
| LOS_flag | Line-of-sight status between the tracked satellite and NGRx | |
| nbrcs_cross_pol_v1 | Cross-polarization ratio of LHCP NBRCS to RHCP NBRCS - SP bin | db |
| nbrcs_scatter_area_v1 | NBRCS scattering area - SP bin | meter2 |
| norm_refl_waveform | Normalized reflected waveform | |
| prn_code | GPS PRN code | |
| pvt_timestamp_gps_sec | PVT timestamp - GPS Seconds | second |
| pvt_timestamp_gps_week | PVT timestamp - GPS Week | week |
| pvt_timestamp_utc | PVT timestamp - UTC | second |
| quality_flags1 | Per-DDM quality flags 1 | |
| raw_counts | DDM bin raw counts | |
| rx_clk_bias | GPS receiver clock bias | meter |
| rx_clk_bias_pvt | GPS receiver clock bias at PVT time | meter |
| rx_clk_drift | GPS receiver clock drift | meter s-1 |
| rx_clk_drift_pvt | GPS receiver clock drift at PVT time | meter s-1 |
| rx_to_sp_range | Rx to Specular point range | meter |
| sample | Sample index | |
| sp_alt | Specular point altitude | meter |
| sp_az_body | Specular point body frame azimuth angle | degree |
| sp_az_enu | Specular point azimuth angle in receiver ENU frame | degree |
| sp_d_snell_angle | Snell angle difference at SP | degree |
| sp_delay_error | Flight software specular point delay error | |
| sp_dist_to_coast_km | Distance from the specular point to the nearest coast | kilometer |
| sp_dopp_error | Flight software specular point Doppler error | s-1 |
| sp_fsw_delay | Flight software specular point delay | |
| sp_inc_angle | Specular point incidence angle | degree |
| sp_lat | Specular point latitude | degrees_north |
| sp_lon | Specular point longitude | degrees_east |
| sp_ngrx_delay_correction | Correction to NGRx specular point delay | |
| sp_ngrx_dopp | NGRx Doppler at specular point | s-1 |
| sp_ngrx_dopp_correction | Correction to NGRx specular point Doppler | s-1 |
| 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_copol | Co-pol Specular point Rx antenna gain - active | dBi |
| sp_rx_gain_xpol | Cross-pol Specular point Rx antenna gain - active | dBi |
| sp_surface_type | Surface type of the specular point | |
| sp_theta_body | Specular point body frame theta angle | degree |
| sp_theta_enu | Specular point theta angle in receiver ENU frame | 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 |
| static_gps_eirp | Static GPS effective isotropic radiated power | watt |
| status_flags_one_hz | 1 Hz status flags | |
| surface_reflectivity | Reflectivity of DDM surface | db/meter2 |
| surface_reflectivity_peak | Peak reflectivity of the surface | |
| sv_num | GPS space vehicle number | |
| track_id | DDM track ID | |
| 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 | |
| zenith_sig_i2q2 | Zenith Signal I2Q2 |
| ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD) | |
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| DATA PRODUCT SPECIFICATION | |
| DATA RECIPE | |
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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 | Rongowai Science Payloads Operations Centre. 2024. Rongowai Level 1 Science Data Record Version 1.0. Ver. 1.0. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/RGOWA-S1A10
For more information see Data Citations and Acknowledgments.
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| Journal Reference | D. Moller, C. Ruf, R. Linnabary, A. O’Brien, and S. Musko. 2021. Operational airborne gnss-r aboard air new zealand domestic aircraft, International Geoscience and Remote Sensing Symposium IGARSS. |
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