| タイトル | Frequency dependence of electromagnetic bias in radar altimeter sea surface range measurements |
| 著者（英） | Walsh, E. J.; Piazza, C.; Yungel, J. K.; Swift, R. N.; Mcintosh, R. E.; Mclaughlin, D. J.; Scott, J. F.; Hines, D. E.; Jackson, F. C.; Hevizi, L. G. |
| 著者所属（英） | EG and G Washington Analytical Services Center, Inc.|Massachusetts Univ.|NASA Goddard Space Flight Center |
| 発行日 | 1991-11-15 |
| 言語 | eng |
| 内容記述 | Range measurements made by satellite radar altimeters experience a bias toward the troughs of ocean waves. A series of aircraft flights during February-April 1989 measured this electromagnetic (EM) bias at three radar frequencies and the UV under a variety of wind and wave conditions, and provided the first airborne open-ocean measurements at the 13.6-GHz and 5.3-GHz operating frequencies of the NASA altimeter on the TOPEX/Poseidon satellite. The data suggest that the mean EM bias decreases linearly with increasing radar frequency between 5.3 and 36 GHz, according to the expression: EM bias (percent of significant wave height) = (3.0-0.0617 F)(1 +/-0.5), where F is in gigahertz. EM bias is fairly constant over a mesoscale region on a given day but can fluctuate significantly from one day to another. It shows a strong increase at all radar frequencies with increasing wind speed, although other sea state conditions, such as the wind direction relative to the wave direction, are also factors. |
| NASA分類 | OCEANOGRAPHY |
| レポートNO | 92A14892 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/330963 |
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