后向散射对激光水下成像的影响研究

为研究后向散射对水下成像的影响,采用辐射传输理论建立了激光水下成像后向散射理论模型,提出了表征后向散射对目标识别影响程度的水下成像后向散射影响系数,给出了距离选通成像后向散射功率及后向散射影响系数的解析表达式。利用Matlab进行了数值模拟分析,得出了水下成像后向散射随探测水深及水衰减系数的变化规律,证明了考虑后向散射对成像质量的影响时,水衰减系数远大于探测水深的影响,说明了非对称因子的取值对成像质量具有较大的影响。

Influence of back-scattering on underwater laser imaging

To study the back-scattering′s effect on underwater laser imaging,the back-scattering model of underwater laser imaging system based on radiation transfer theory has been established.Back-scattering affect function is brought out.The analytical expression of the function and the range gated back-scattering power is given out.Using Matlab,the back-scattering power′s relationship with water depth and water attenuation coefficient is obtained.It is proven that the influence of water attenuation coefficient on underwater imaging quality is much larger than the water depth and the asymmetry factor′s effect on underwater imaging quality is serious.