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针对二次调频-伪码调相（quadratic frequency modulated-pseudo random binary phase code,QFM-PRBC）复合信号伪码估计的难题,提出一种基于分数阶模糊函数（fractional ambiguity function,Fr-AF）和改进的三角窗抗干扰核函数（reduced interference distribution kernel based on the triangular window,RIDT）变换的伪码估计算法。应用平方法解决伪码