研究目的
To measure Sea Surface Height (SSH) using Ku- and K-band 'Signals of Opportunity' (SoOp) from DirecTV Direct Broadcast Satellite (DBS) system and compare it with tide gauge measurements, and to explore the potential for spaceborne applications to resolve mesoscale eddies in coastal regions.
研究成果
The experiment demonstrated SSH measurement precision of 2.78 cm for Ku-band and 2.58 cm for K-band using SoOp, matching error models with minor discrepancies. The methodology shows potential for spaceborne applications with high temporal and spatial resolution, capable of resolving mesoscale eddies in coastal regions using a constellation of small satellites.
研究不足
Differences in error between expected and measured values due to ocean condition variations during data recording and different sampling areas (point vs. area). Land contamination and rapid variations in coastal oceans may affect measurements. Future work includes adding random errors to simulations and improving transmitter orbit knowledge.
1：Experimental Design and Method Selection:
A proof-of-concept experiment was designed to verify the error model for altimetric precision of wideband SoOp signals. The methodology involved using bistatic radar configuration with SoOp from DirecTV DBS signals in Ku- and K-bands.
2：Sample Selection and Data Sources:
Data were recorded at Platform Harvest, an offshore oil platform, over 72 hours from Aug 03 to Aug 06,
3：In situ SSH measurements from a tide gauge at the platform were used for comparison. Wind speed and significant wave height data were obtained from Buoy List of Experimental Equipment and Materials:
20 Two commercial Ku/K-band dish antennas (DirecTV Slimline SL5K4NR0-02) with LNBs, a frequency-generator beacon, a signal meter (Acutrac III K/Ku Band Satellite Signal Meter), a spectrum analyzer, polarity lockers (4SATPL-T), line amplifiers (LA144R-T), an RF front end designed by GSFC, and a ROACH2 system for data recording.
4：Experimental Procedures and Operational Workflow:
Antennas were deployed 28 m above the ocean surface, aligned using a signal meter and spectrum analyzer. Signals were recorded from geostationary satellites at 101°W (Ku-band) and 99°W (K-band). Data were recorded in bursts of
5：24 ms with 215 ms intervals, collecting LHCP and RHCP direct and reflected signals. Data Analysis Methods:
Post-processing involved filtering with a 400 MHz lowpass filter, cross-correlation with coherent integration time of 4 ms, incoherent summing for 0.5 s, parabolic fit to estimate delay, and calculation of SSH using geometric elevation angle. Error statistics were generated by comparing with tide gauge data.
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