Analysis of collinear passes of satellite altimeter data
Analysis of collinear passes of satellite altimeter data
复制标题
卫星高度计数据共线经过分析
DOI：
10.1029/91jc02451
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发表时间：
1992
影响因子：
--
通讯作者：
C. Rizos
中科院分区：
文献类型：
--
作者：
H. V. Gysen;R. Coleman;R. Morrow;B. Hirsch;C. Rizos
对重复卫星地面轨道上的测高测量进行分析，如地球卫星精确重复飞行任务，为确定海面高度的时间变异性提供了一种极好的方法。这种共线分析通常分两步进行：首先，确定平均海平面剖面，然后消除径向轨道误差。我们提出了一种新的统一分析方法，用于同时估计轨道误差、平均海面高度和每一次通过的剩余海面高度(变率)。所有通道都以完全相同的方式处理；通过附加最小条件集来克服模型中随之而来的等级或基准面缺陷，这些条件要么选择为不给出轨道的总体扭曲，要么选择与参考剖面(如大地水准面)最好的拟合。高度计数据中的间隙很容易被适应。该方法的数值结果是使用地球卫星精确重复任务第一年的数据显示的。对径向轨道误差模型的选择作了一定的考虑。结果表明，对于轨道误差的消除，正弦模型在一圈周期内是最合适的。对于长度小于一圈的通道，如果使用正弦模型，则较长波长的海洋信号的一个分量会丢失。如果分析了超过大约两周(约200分钟)的过程，则需要额外的项来消除非引力扰动。
The analysis of altimetry measurements along repeated satellite ground tracks, as in the Geosat Exact Repeat Mission, provides an excellent way of determining temporal variability in the sea surface height. This collinear analysis is usually carried out in two steps: first, by determining a mean sea level profile and then by removing a radial orbit error. We propose a new unified analysis method for the simultaneous estimation of orbit error, mean sea surface height, and residual sea surface heights (variability) with respect to each pass. All passes are treated in exactly the same way; the consequent rank or datum defect in the model is overcome by appending a minimal set of conditions, chosen either to give no overall distortion of the orbits or otherwise a best fit to a reference profile, such as the geoid. Gaps in the altimeter data are easily accommodated. Numerical results of the method are shown using data from the first year of the Geosat Exact Repeat Mission. Some consideration is given to the choice of radial orbit error model. The results indicate that for orbit error removal, a sinusoid model is the most appropriate over a one-revolution cycle. For passes less than one revolution in length, a component of the longer wavelength ocean signal is lost if using the sinusoid model. If passes longer than about two revolutions (some 200 mins) are analyzed, additional terms are needed to eliminate nongravitational perturbations.