亚航QZ8501搜救航路GPS高程数据研究

Research of GPS elevation on searching route of QZ850

文章针对"南海救101"轮前往爪哇海QZ8501失事区域一段330 km航路上记录的GPS数据,进行粗差剔除和小波去噪,得到平滑的GPS高程数据。根据DTU10全球海洋潮汐模型的主要分潮,预报了航路上4个站位的潮位数据,按照时间最近、距离最小的原则得到了船舶航路上的潮位。按照航路的地理坐标,提取出了DTU10全球平均海平面模型的数据。将平滑的GPS高程数据与DTU10模型数据进行比较分析,得到了推算潮位,并将推算潮位与预报潮位进行了比较分析,两者的平均差值为-0.11 m,可以满足远海水深小于200 m的区域的潮位改正需求。

The GPS data was recorded on the way to QZ8501 crash zone in Java Sea by ＂Nanhaijiu 101＂, andthe length of the way was 330 km. The GPS data was processed to remove the gross error. The smoothed data was gotafter wavelet analysis. According to the DTU10 model, tide data of 4 stations was forecasted on the route. The tide ofthe vessel on the route was got by the nearest time and distance principle. According to the coordinate of the route,the mean sea level data of DTU10 model was got. Compared the smoothed GPS elevation with the model data, thecalculated tide was obtained. Comparative analysis was performed between calculated tide and forecast tide. The dif-ference is-0.11 m, and it could meet the requirement of bathymetry of 200 m areas.