根据海表面的散射机理和船舶在海中的运动规律,建立了3次谐波船舶运动模型,提出了船载S波段雷达回波多普勒谱的中心频率和谱宽的理论模型.本文采用仿真多普勒谱的方法,分析了船载S波段雷达多普勒谱的中心频率和谱宽大小与船速的关系,并讨论了船舶各种运动导致多普勒谱的变化情况,最后采用一段实测船载三坐标速度并仿真其多普勒谱,结果表明其中心频率的变化明显,谱展宽明显.文章的结论为船载S波段雷达海浪参数提取提供先验信息和理论模型,具有重要的价值.%According to the scattering mechanism of sea surface and ship movement, three harmonic motion model of the ship is established. Based on ship-borne S-band radar, a theoretical model is proposed for the center frequency andband-width of Doppler spectrum. Next, using the method of simulation of Doppler spectrum, the relationship between the center frequency and bandwidth of spectrum and speed of the ship is analyzed. Meanwhile, the variation of Doppler spectrum caused by various ship motion is discussed. At last, by measuring the speed of ship and simulation of Doppler spectrum, the results show that the center frequency and bandwidth vary obviously. The research result of this paper can offer priorinform-ation and theoretical model for the extraction of wave parameters based on ship-borne S-band radar, which has important values.
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