中国近岸海域高度计JASON-1测量数据的 波形重构算法研究
Improving the quality of JASON-1 altimetry data by waveform retracking in coastal waters off China
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摘要: 卫星雷达高度计的测量数据目前已被广泛应用于各个领域,但高度计在近海的测量数据却一直不可用,一方面是因为高度计在近岸海域的回波波形测量受陆地回波的影响,另一方面是因为一些校正量对近海不准确,如大气湿对流层校正、海洋潮汐校正以及大气高频因数校正等。通过对高度计在近海测量的回波波形进行重构处理,可以缩短近海数据不可用的距离,提高数据的数量和质量。以我国海域及邻近海域(14°~45°N,105°~130°E)为研究区域,采用四种波形重构算法(海洋算法、重力中心偏离算法、冰层算法二和阈值算法)对JASON-1高度计1 a共31个周期的测量波形重新进行了计算,比较了轨道交叉点处升轨和降轨的海面高度异常值以及海面高度值与验潮站的实测水位,结果表明重力中心偏离法比其他三种算法更适合我国近海的测高波形重构:计算结果精度最高,有效数目最多。Abstract: The satellite altimetry products are widely used by researchers and operational users. However, altimeter measurements over coastal waters are unavailable because of land contamination of the altimeter return waveforms and inappropriate geophysical corrections, such as the atmospheric wet troposphere correction, the ocean tide correction and the high-frequency factor correction. To shorten the unavailable distance offshore, four waveform retracking algorithms (ocean, offset centre of gravity, Ice-2, and threshold retracking algorithms) are compared using the JASON-1 altimeter measurements over China’s seas. Results, which are validated using crossover analysis and in situ sea surface height data show that the OCOG algorithm is more suitable than the other three algorithms for China’s offshore altimeter waveform retracking.
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Key words:
- satellite radar altimeter /
- waveform retracking /
- China’s coast
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