基于热释电红外传感器的弱磁信号智能采集方法研究

Research on intelligent collection method of weak magnetic signal based on pyroelectric infrared sensor

对弱磁信号采集受到环境干扰和采集传感设备部署节点不合理等因素的影响,导致采集的信号具有大量干扰噪声,为了提高弱磁信号采集的分辨能力,结合阵列信号处理技术,提出基于热释电红外传感器的弱磁信号智能采集方法。构建弱磁信号智能采集的热释电红外传感器的节点分布阵列模型,结合相位偏移修正和噪声干扰抑制的方法,构建弱磁信号采集的滤波模型,基于信号波形的相干阵列检测方法实现对弱磁信号的空域特征增强,结合多径信号相干匹配技术和相应的多个DOA估计技术,通过热释电红外传感器的阵列节点输出信号的增强和滤波处理实现信号智能采集。实验结果表明,采用该方法进行弱磁信号智能采集的输出信号幅度和相位增益性较好,输出信噪比为45.9 dB,弱磁信号的误码率为0.55 bit,说明本方法具有实用性。

The acquisition of weak magnetic signals is affected by factors such as environmental interference and unreasonable deployment of sensing equipment nodes,resulting in a large amount of interference noise in the collected signals.In order to improve the resolution of weak magnetic signal acquisition,an intelligent acquisition method for weak magnetic signals based on pyroelectric infrared sensors is proposed by combining array signal processing technology.Construct a node distribution array model for the intelligent acquisition of weak magnetic signals using pyroelectric infrared sensors,and combine phase shift correction and noise interference suppression methods to construct a filtering model for weak magnetic signal acquisition.The coherent array detection method based on signal waveform enhances the spatial features of weak magnetic signals,and combines multipath signal coherent matching technology and corresponding multiple DOA estimation techniques,Intelligent signal acquisition is achieved by enhancing and filtering the output signals of the array nodes of pyroelectric infrared sensors.The experimental results show that the output signal amplitude and phase gain of intelligent acquisition of weak magnetic signals using this method are good,with an output signal-to-noise ratio of up to 45.9 dB and a bit error rate of up to 0.55 bit for weak magnetic signals,indicating the practicality of this method.