机载海洋波谱仪回波数据处理方法研究

Research on Processing Method of the Airborne Oceanwave Spectrometer Data

海洋波谱仪机载飞行试验通过对星载天线进行宽波束等效,能够测量海面后向散射系数,进而反演波浪谱及波浪参数。利用该系统在黄海中部进行飞行试验,对小入射角下波浪测量数据进行处理和分析,采用后向投影积分校正载机运动和天线旋转引起的越距离单元徙动,采用交叉谱方法降低斑点噪声,实现小海况下波浪谱反演,结果表明海洋波谱仪测量得到的波浪谱、有效波高、主波长、主波向等波浪参数与浮标、卫星同步测量吻合较好。

The experiment of the oceanwave spectrometer, using wide beam equivalent to satellite anten- na, is capable of measuring the backscattering coefficient of the sea surface and retrieving the wave spec- trum and wave parameters. The experiment was made in the middle of the Yellow Sea. The radar echo da- ta of small incidence angle was processed and analyzed. Back projection integration was uesed to partly correct the range cell migration caused by the airplane flying and the anttenna rotating. Besides, cross spectral method was used to reduce the speckle noise. Thus, oceanwave spectrum was able to be retrieved in low sea-state. The results show that the measurement of wave spectrum, significant wave height, main wavelength and main wave direction of oeeanwave spectrometer were consistent with those of synchronous buoy and optical satellite measurements.