中文摘要：

为了模拟较为真实的GNSS海面回波信号，除了GNSS海面反射信号外，海杂波信号也是必不可少的．海杂波的建模和仿真是回波信号模拟逼真度的决定因素．文章运用网格映像法划分海面杂波单元，并确定合适的幅度分布模型和功率谱模型，完成机载海杂波信号的建模．最后，进行了海面回波信号的模拟仿真，并与机载实验的实测数据进行了比较，结果表明仿真数据与实测数据的相关系数可优于0．9，从而验证了该方法的有效性和合理性．

英文摘要：

In order to simulate the real sea surface echo signals of GNSS, sea clutter signal is essential besides GNSS reflection signal from the sea surface. Modeling and simulation of sea clutter is the decisive factor of the fidelity of echo signal simulation. In this paper, the grid mapping method is used to divide the sea clutter elements, and the appropriate amplitude distribution model and power spectrum model are es- tablished to complete the modeling of airborne sea clutter signal. Finally, the simulation of sea echo signal is carried out and compared with the measured data. The result indicates that the correlation coefficient be- tween the simulation data and the measured data is better than 0.9, which proves the validity and rationali ty of the method.