fifth-orderBNC¹⁷³⁹⁹⁵⁺² 例句 We analyze the frequency response characteristics of the regression filter and compare the computational complexity of regression filter with that of fifth-order elliptic IIR ground clutter filter. 分析了回归滤波器频率响应特性，比较了回归滤波器与 IIR椭圆地物杂波滤波器的计算复杂度。 fabiao