Geosat/GM波形重跟踪反演中国沿海区域重力异常
Chinese Coastal Gravity Anomalies from Waveform Retracked Geosat/GM Altimetry
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摘要: 利用Geosat/GM测高波形数据,在中国海域内(117°E~129°E,21°N~41°N)比较了阈值法、Beta5和改进阈值法三种重跟踪算法。分析表明,改进阈值法优于其他两种重跟踪方法。由改进阈值法的测高数据,分别采用最小二乘法(least square collocation,LSC)和逆Vening-Meinesz(IVM)计算了卫星测高重力异常,并与船测重力数据进行了比较。结果显示,LSC的精度优于IVM。与KMS02和Sandwell&Smith V15两个重力场模型相比较,本文结果在东海优于这两个模型,在台湾海域结果稍差,需要融合ERS-1等其他数据进一步提高精度。Abstract: 【Abstract】Three retracking methods are compared in the area 117°E-129°E,21°N-41°N of China Sea,and the improved threshold shows the best result,using Geosat/GM waveform data.Least square collocation(LSC) gives a better result than IVM when comparing with the shipborne gravity and gravity anomaly from the improved threshold altimeter data.In order to improve the accuracy of altimeter gravity anomaly,the Guass filter is used and the wavelength is 16 km.The gravity anomalies from the improved threshold are compared with that of KMS02 and V15,the former is best in the East sea and a little worse than the other two in Taiwan area.
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