一种超低频通信下行信号电磁干扰自适应抵消系统设计

发布时间：2018-07-21 16:07

【摘要】：超低频通信下行信号接收端受空间、地形等条件约束,难以布设远端参考线圈,因此传统的自适应干扰压制方法难以获得良好的干扰抵消性能。为解决这一难题,基于自适应相关抵消的原理,针对超低频通信下行信号的接收,提出采用多参考线圈与主接收天线本地正交布设的方案设计探测系统,并研究了一种电磁干扰自适应抵消系统的实现方法。然后,以工频谐波干扰的抵消为例进行了测试,实测结果表明:对于与干扰频谱不相重合的微弱单音信号,在不同信号强度下,采用一种基于通道相关性的多通道可变遗忘因子自适应RLS滤波算法,信干比平均改善23.51dB,其最大增益可达25.87dB,平均信噪比增益为8.13dB,说明该系统能够有效压制超低频电磁干扰。
[Abstract]:The receiver of the downlink signal in ultralow frequency communication is restricted by space, terrain and other conditions, so it is difficult to arrange the remote reference coil, so the traditional adaptive interference suppression method is difficult to obtain good interference cancellation performance. In order to solve this problem, based on the principle of adaptive correlation cancellation and the reception of downlink signal in ultra-low frequency communication, a detection system is designed by using local orthogonal arrangement of multi-reference coil and main receiving antenna. A realization method of electromagnetic interference adaptive cancellation system is studied. Then, taking the power frequency harmonic interference cancellation as an example, the test results show that: for the weak mono signal which does not coincide with the interference spectrum, under different signal intensity, A multi-channel variable forgetting factor adaptive RLS filtering algorithm based on channel correlation is adopted. The signal-to-interference ratio is improved by 23.51 dB on average. The maximum gain is 25.87 dB and the average signal-to-noise ratio gain is 8.13 dB, which shows that the system can effectively suppress ultra-low frequency electromagnetic interference.
【作者单位】：海军工程大学电子工程学院;中船重工集团公司第七二二研究所;
【基金】：国家自然科学基金资助项目(41274013;41576105)
【分类号】：TN972

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