基于现场的卫星高度计定标技术研究  

Study on the Technology of In-situ Calibration and Validation of Satellite Altimeter

作　　者：翟万林[1] 陈春涛[1] 闫龙浩[1] 朱建华[1] 

机构地区：[1]国家海洋技术中心,天津300112

出　　处：《海洋技术》2014年第6期13-19,共7页Ocean Technology

基　　金：国家海洋局青年海洋科学基金资助项目(2013431);海洋公益性行业科研专项资助项目(201105032-5;201305032-3)

摘　　要：卫星高度计数据的广泛应用离不开准确的现场定标检验工作。在青岛千里岩海上试验的基础上,分别使用GNSS浮标法和潮汐法对Jason-2卫星高度计进行了定标。其结果显示:(1)GNSS浮标法使用高精度GNSS数据处理软件GAMIT/GLOBK及其Track模块,对GNSS浮标数据进行高精度处理,得到的高度计偏差为+195.7 mm,该方法可以消除大地水准面和潮位的影响,精度较高;(2)在潮汐法中,利用FVCOM海洋模式模拟了千里岩周边的潮位,并对比了GNSS浮标测得的潮位结果,二者的标准偏差达到了1.3 cm,满足高度计定标的要求,结合EGM2008计算的大地水准面和平均动力地形,得到的高度计偏差结果为+150.9±35.1 mm,该方法受限较多,精度较差。但两种方法最终得到的高度计偏差与国际其他定标场的结果相当。The wide application of satellite altimeter data needs accurate in-situ calibration and validation.Based on the experiment on the sea of Qianliyan in Qingdao, two methods were used to complete the validation of Jason-2 GDR products. The results showed that in the GNSS buoy method, the GNSS data were processed in a high-accuracy way using the GAMIT/GLOBK software and Track module to calculate the sea surface height（SSH） and compare with the altimeter results, with the bias being ＋195.7 mm. This method needs not to take the geoid and tide differences into account, and can achieve higher accuracy. In comparison, in the tide method, the tides around the Qianliyan Island were simulated using the FVCOM ocean model. The standard deviation reached1.3 cm when compared with the measurements of GNSS buoy, satisfying the requirements of altimeter validation which was completed by using the tide differences acquired by the FVCOM ocean model. Combined with the geoid gradient calculated through the EGM2008 gravity model and the mean dynamic topography, the altimeter bias was derived to be ＋150.9±35.1 mm. The tide method is restricted in adoption for lower accuracy. The results from the two methods show a good consistency with other calibration sites in the world.

关 键 词：卫星高度计 海面高度定标 GAMIT/GLOBK GNSS浮标 FVCOM EGM2008 Jason-2 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置] P715.7[自动化与计算机技术—控制科学与工程]