摘要
在海上蒸发波导反演研究中,传统的遗传算法存在反演速度慢,早熟收敛的现象。在GPS散射信号反演海上蒸发波导的背景下,基于双参数蒸发波导模型,运用一种约束最优化方法——外点法(外部惩罚函数法)进行目标函数搜索,从而进行蒸发波导反演。实验的目的是为了验证算法的优越性,所以不考虑接收机的灵敏度等问题。因此,假定波导高度真值,由此得出的功率矢量看作实测的GPS散射信号功率,同时,在一定波导高度范围内逐一进行搜索,搜索到的每一个高度值对应的功率矢量即为仿真的GPS散射信号功率,根据目标函数,分别与实测值进行比较,最接近的一组功率矢量对应的波导高度即为反演得到的最优值。实验结果显示出外点法相对于蚁群算法,反演速度快,迭代次数少,计算结果精度较高。
In the process of inverting evaporation duct, traditional genetic algorithm presents a slow speed of inversion and premature convergence. External point method is used based on the method of two - pa- rameter evaporation duct during the inversion for evaporation duct using GPS signals scattered. In the ex- periment, sensitivity of the receiver is not considered. Therefore, assuming evaporation duct height （EDH） as true value which resulting in power vector, the power vector is regarded as measured power of GPS signals scattered. At the same time, research EDH at a certain height range, and then resulting in a series of power vector, which are regarded as simulated power of GPS signals scattered. According to tar- get function, comparing the measured value and simulated value, the closest set of power vector corre- sponding EDH is the optimal value of inversion. Experimental results show that external point method presents higher speed of inversion, fewer iterations and exacter calculation than ant colony algorithm.
出处
《中国电子科学研究院学报》
2013年第6期605-610,共6页
Journal of China Academy of Electronics and Information Technology
基金
山东省"泰山学者"建设工程专项经费资助
关键词
外点法
蒸发波导
蚁群算法
修正折射率
external point method
evaporation duet
ant colony algorithm
modified refractivity
