基于分数阶模糊函数线调频率延时对消的运动弱目标检测

针对回波信号相位中存在的三次项问题，文中介绍了分数阶模糊函数的定义及部分性质，在此基础上研究了含有三次项的运动目标回波信号的分数阶模糊函数的线性调频延时特性，根据此特性文中提出了一种海杂波背景下的基于分数阶模糊函数线调频延时对消的运动弱目标检测方法。该方法通过将原信号的分数阶模糊函数模函数与线性调频延时后信号的分数阶模糊函数模函数对消，能在基本不减弱信号分数阶模糊函数模值的情况下有效地对消部分杂波，达到提高信杂比，提高检测性能的目的。最后，通过对IPIX实测数据验证表明，所提方法在增加目标与杂波分数阶模糊函数域峰值差以及提高信杂比等方面都明显优于仅对回波作分数阶模糊函数。文中采用双参数恒虚警检测方法设置适当的门限，该检测方法能够达到更好的检测效果。 

Weak Target Detection Based on LFM-delay Fractional Ambiguity in Sea Clutter

In the paper,the definition and partial character of fractional ambiguity is introduced.Based on the introduction the LFM-delay characteristic of fractional ambiguity is investigated for the echo that has high polynomial.Based on the characteristic a new method based on the difference of LFM-delay fractional ambiguity model for moving weak target detection in sea clutter is proposed.The method can difference partial clutter effectively and can not difference the fractional ambiguity model of signal at the s...