高频地波航海导航定位方法研究

Study of position finding for marine navigation based on high-frequency ground-wave

提出了一种基于高频地波传播的船只导航定位系统设计方法。该方法通过接收3个固定发射基站发射的导航定位参考信号(时基同步的线性调频信号),借助于谱分析技术实现了定位船只的距离与运动速度信息精确提取以及天地波信号的有效分离。数据仿真表明,定位精度与测量信噪比相关,即相参积累时间越长,定位精度越高,因此通过调整相参积累处理时间即可获得定位精度所要求的累积信噪比。

A design method of marine navigation and positioning based on high-frequency ground-wave propagation is presented. It receives the signals transmitted from three land-based transmitters with the time-base-synchronized frequency-modulated continuous waveform and extracts the current distances to the three transmitters and moving velocity of ship by special spectral analysis. With range resolution the method can effectively separate the useful ground-wave signal from the much stronger sky-wave signals. Digital simulation shows that the positioning accuracy is dependent on the signal-to-noise ratio for measurement, and the longer the coherent accumulation time is, the higher the positioning accuracy is.