一种基于奇偶判断WPT的多音干扰抑制方法  

A multi-tone interference suppression method based on parity checking WPT

作　　者：章兰英 任岱祥 ZHANG Lanying;REN Daixiang(Space Engineering University,Beijing 102249,China;Military 63770,Xi’an 710600,China)

机构地区：[1]航天工程大学,北京102249 [2]63770部队,西安710600

出　　处：《空间电子技术》2021年第4期39-44,共6页Space Electronic Technology

摘　　要：频移小波包变换可以有效抑制窄带干扰,以提高扩频测控系统的抗干扰能力,但是在多音干扰下,当信号左右节点都存在干扰时,由于不能通过子带能量大小来确定子节点是否继续分解,导致该方法不能抑制多音干扰。针对该问题,提出了一种基于奇偶判断WPT的多音干扰抑制方法,通过采用子带能量差平稳度函数来判断干扰最佳频移量,然后对频移后的干扰子带进行编号,并通过门限判断进行干扰子带定位,确定干扰子带的编号,再通过对干扰子带的编号进行奇偶判断,可以得到小波包的自适应分解树,实现信号的自适应分解,分解到最底层后将干扰子带置零,最后根据分解树反向进行信号重构,完成干扰抑制。通过对误码率、测速精度和测距精度的仿真,结果表明该方法能够有效抑制多音干扰。In order to improve the interference suppression ability of Spread Spectrum TT&C system,frequency shift wavelet transform is used to suppress the narrow band interference(NBI).But under the condition of multi-tone suppression,when the interferences are both in the left and the right node of the signal,it can't judge whether it should be decomposed by comparing the sub-bands energy.It cause that it can't suppress the multi-tone interference by using this method.In order to solve this problem,a multi-tone interference suppression method based on parity checking is proposed in this paper.The optimum frequency shift is obtained by judging the sub-bands energy difference placidity function.The sub-bands are numbered and the interference sub-bands are got by comparing to the threshold.The interference sub-bands are parity checked to get the adaptive WPT tree,which can make sure that the signal can be decomposed adaptively.The interference sub-bands are set to zero and reconstructed according to the adaptive WPT tree to suppress the multi-tone interference.The BER,range rate accuracy and ranging accuracy simulation results indicate that this algorithm can suppress multi-tone effectively.

关 键 词：多音干扰 干扰抑制 小波包变换 奇偶判断 

分 类 号：TN974[电子电信—信号与信息处理]