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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Lowe, S.T. Zuffada, C. LaBrecque, J.L. Lough, M. Lerma, J. Young, L.E. |
| Copyright Year | 2000 |
| Description | Author affiliation: Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA (Lowe, S.T.) |
| Abstract | The authors present the first airborne ocean-altimetry measurement made using reflected GPS signals. Data were collected from a Cessna airplane flying off the coast of Santa Barbara, California, where the direct and ocean-reflected GPS L1 signals were downconverted and recorded onboard at 20.456 MHz. In addition, the direct signals were processed with a TurboRogue GPS receiver and used to derive accurate receiver positioning. The 20 MHz samples were processed with a "software GPS receiver", developed for this task, to extract the direct and reflected signal waveforms, using both the C/A and Y-codes. These waveforms were fit to obtain a direct/reflected reception delay difference, each second. These delays were fit for ocean height and clock offset. First results for the C/A-code waveforms show the mean of the measured 1-sec values agrees well with altimetry database values. The residual height RMS was 3.1 m during straight, level flight, and 4.7 m for all data and all PRNs. Further analysis refinements, including more accurate waveform modeling and fitting, C/A-code sidelobe elimination, atmospheric modeling, and the use of Y-code waveforms, will likely improve these results. |
| Starting Page | 2185 |
| Ending Page | 2187 |
| File Size | 247617 |
| Page Count | 3 |
| File Format | |
| ISBN | 0780363590 |
| DOI | 10.1109/IGARSS.2000.858350 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2000-07-24 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Sea measurements Global Positioning System Signal processing Atmospheric modeling Airplanes Propagation delay Oceans Clocks Atmospheric measurements Altimetry |
| Content Type | Text |
| Resource Type | Article |
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