对罗兰-C脉冲水下传播特性预测模型算法进行推导研究,综合考虑了信号先沿陆海表面、再由空气入水传播时的路径损耗、相位延迟、色散效应及空气海水界面两侧场量的约束条件.分析了0~10m不同海水深度罗兰-C电场幅度与相位的变化,并与无畸变的标准场信号进行比较.结果显示:随着入水深度增加,色散效应导致脉冲前沿展宽,跟踪点相位超前.该结果去除了由参比场量近似引入的误差,精度更高.%The prediction theory and algorithm of Loran-C signals propagation characteristics under water are studied.The path loss,phase delay,dispersion effect,as well as boundary condition are all taken into account as the pulse signals propagation along the earth surface and then into the water.The amplitude and phase of the Loran-C signals in different depths (0~10m) of water are discussed.The predicted results by the proposed algorithm are compared to the standard ones with no waveform distortion.It is shown that due to dispersion effect,the envelope of the waveform would broaden and the phase of the tracking point would advance as the depth of water increases.Because the error introduced by the reference fields'' approximation is deleted,the result should be more accurate.
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