求翻译：其次，从非正弦周期函数的傅立叶分解的角度出发，建立非正弦周期信号的连续和离散状态空间数学模型，在此基础上提出了利用并联观测器从非正弦周期信号中在线估算各次谐波的方法—瞬时谐波估算法，并分析了该算法的闭环频率响应。是什么意思？

Second, starting from the point of view of non-sinusoidal periodic function of the Fourier decomposition, the establishment of continuous and discrete state space mathematical model of non-sinusoidal periodic signal, based on a parallel observation line estimates from the non-sinusoidal periodic sig

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正在翻译，请等待...

Second, from the perspective of the Fourier decomposition of non-sinusoidal periodic functions, establishment of non-sinusoidal periodic signals the continuous and discrete state-space model, made on this basis from non-sinusoidal periodic signals using parallel observations-online estimation of har

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