Geosat crossover analysis in the tropical Pacific: 1. Constrained sinusoidal crossover adjustment
Geosat crossover analysis in the tropical Pacific: 1. Constrained sinusoidal crossover adjustment
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热带太平洋地理卫星交叉分析：1. 约束正弦交叉平差
DOI：
10.1029/jc093ic09p10621
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发表时间：
1988
影响因子：
--
通讯作者：
C. Tai
中科院分区：
文献类型：
--
作者：
C. Tai
一种新的方法（称为约束正弦交叉调整），用于消除卫星测高的轨道误差进行了测试（使用交叉积累的前91天的Geosat nonrepeat时代在热带太平洋），并发现有许多优秀的品质。两个特点区分新方法从传统的偏置和倾斜交叉调整。首先，正弦波（波长等于地球周长）用于表示卫星每一圈的轨道误差，而不是卫星地面轨道每一段的偏置和倾斜（和曲率，如果必要的话）方法。第二，调整过程的不确定性通过使正弦波的振幅最小化的简单约束而不是通过固定选定的轨道来消除。总的来说，新方法比旧方法更准确、更高效，而且实施起来也不那么麻烦。为了保持大规模的长期海洋变化性，将交叉调整限制在相隔少于某些天的轨道之间的交叉，这一想法也得到了检验，但结果不确定，因为在地球观测卫星使命的最初91天中，轨道误差是不寻常的非平稳。
A new method (called constrained sinusoidal crossover adjustment) for removing the orbit error in satellite altimetry is tested (using crossovers accumulated in the first 91 days of the Geosat nonrepeat era in the tropical Pacific) and found to have many excellent qualities. Two features distinguish the new method from the conventional bias-and-tilt crossover adjustment. First, a sine wave (with wavelength equaling the circumference of the Earth) is used to represent the orbit error for each satellite revolution, instead of the bias-and-tilt (and curvature, if necessary) approach for each segment of the satellite ground track. Second, the indeterminacy of the adjustment process is removed by a simple constraint that minimizes the amplitudes of the sine waves rather than by fixing selected tracks. Overall, the new method is more accurate, more efficient, and much less cumbersome to implement than the old method. The idea of restricting the crossover adjustment to crossovers between tracks that are less than certain days apart in order to preserve the large-scale long-term oceanic variability is also tested with inconclusive results because the orbit error was unusually nonstationary in the initial 91 days of the Geosat mission.