利用MATLAB实时处理GPS数据

利用MATLAB软件环境,现场接收并实时处理海上地球物理调查过程中的GPS定位数据,剔除原始数据中的跳点,处理定位误差。采用样条拟合对测线进行拟合光滑,绘制各步处理结果的图形,并将处理前后的航向、航速数据及由此计算出的Eotvos改正值绘制成的曲线进行比较,结果表明:由原始数据计算得到的定位误差较大,与实际船体航行的轨迹有一定差距,而用经过MATLAB处理后的数据计算得到的定位误差较小,航向、航速等与船体航行的真实航迹接近,由此计算出的Eotvos改正值的精度也达到了海上重力测量中Eotvos改正的要求,保证了地球物理数据的质量。

Real-time processing of GPS data using MATLAB

In the geophysical survey at sea, the computer is used to receiver GPS (Global Position System) data,take real-time data processing, inspect the GPS data quality, and to make error-correction of GPS data as the precondition of improving the quality of geophysical survey data. On the basis of MATLAB software, we can receive GPS data through serial port, delete error anchor point and fit the line with smoothing spline. The outcome graph is plotted at each processing steps, so as to control the processing quality and ensure outcome credibility. The real-time processing of GPS data can give the ship's heading and velocity accurately, and the result can be used to make other correction betimes and credibly, such as the Etvs correction for gravity survey at sea.