基于多颗在轨高度计数据的中国近海平均海平面模型建立
Mean sea surface over China sea derived from multi-satellites altimeter data in orbit
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摘要: 联合使用Jason-2成功发射3 a来的Jason-2(cycle 001-113)、轨道调整前后的Envisat(cycle 070-107)以及轨道调整后的Jason-1(cycle 263-352)等在轨高度计卫星数据,首先对电离层延迟校正项进行平滑处理,再经过数据编辑和各项地球物理及环境改正后,对周期(cycle)逐一进行统计验证并剔除交叉点不符值异常的数据周期,采用共线处理和交叉点平差削弱海面时变和径向轨道误差的影响,再经参考椭球和参考框架基准的统一,最后选用Shepard方法建立了我国海域及邻海海域(0°~45°N,100°~140°E)2'×2'分辨率的平均海平面模型。将所建立模型与MSS_CNES_CLS01模型和MSS_CNES_CLS10模型进行了比较,不符值RMS分别为8.28和11.65 cm,验证了所开展模型的正确性。Abstract: Based on the multi-satellite altimeter data in orbit, which include Jason-2 data since its successful launch(cycle 001-113), Envisat data(cycle 070-107,cross the track adjusted periods) and Jason-1 data after the track adjusted (cycle 263-352), these altimeter data are analyzed and validated cycle by cycle to eliminate the exceptional data cycle after ionosphere correction smoothing, geophysical correcting and data editing. Then the effects of time variation and radial orbit error in the altimetry data are weakened by the collinear process and crossover adjustment. After the unification of reference ellipsoid and reference frame, a 2'×2' resolution mean sea surface model over China sea and its adjacent sea areas(0°-45°N, 100°-140°E) is obtained by Shepard method. Finally, the presented mean sea surface model is compared with MSS_CNES_CLS01 and MSS_CNES_CLS10 model, and the root-mean-square values are 8.28 cm and 11.65 cm respectively. This proves that the new mean sea surface model is correct.
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Key words:
- altimetry /
- ionosphere correction smoothing /
- adjustment /
- gird /
- mean sea surface
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