利用等离子体非线性效应的三波法是解决"黑障"问题的一种可能的解决方案.从三波非线性理论出发,详细介绍了转化效率的计算方法,进而对不同等离子体电子密度模型下的非线性效应进行分析.数值仿真结果表明:存在一个最优的信号入射角度,当信号以该角度入射时转化效率最大;等离子体厚度会对最佳入射角产生一定影响,当厚度减小时,最佳入射角变大;等离子体电子密度变化范围、厚度、入射波及泵源参数都相同时,共振点处电子密度导数值越大,非线性效应越强.%The three-wave nonlinear effect of radio wave propagation in plasma is one possible solution to the problem of "black out".Base on three-wave nonlinear theory, the method for calculating the conversion efficiency is introduced and the nonlinear effect under different plasma electron density model are analyzed.The results of numerical simulation show that there is an optimal signal incident angle, at which the conversion efficiency is maximum;when the thickness of plasma is reduced, the optimal signal incident angle is increased;the larger the derivation value in resonance point of plasma electron density, the greater the nonlinear effect, while the other parameters are identical.
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