一种基于参数可调随机共振的双模噪声中信号的检测  

Signal Detection Based on Adjustable Parameters of Stochastic Resonance in the Background of Bimodal Noise

作　　者：孙万麟[1] 山拜.达拉拜 

机构地区：[1]昌吉学院物理系,新疆昌吉831100 [2]新疆大学信息科学与工程学院,新疆乌鲁木齐830046

出　　处：《安徽师范大学学报（自然科学版）》2014年第3期247-251,共5页Journal of Anhui Normal University(Natural Science)

基　　金：昌吉学院科研基金重点资助项目(2013YJZD002)

摘　　要：为了避免因采样频率而引起系统输出发散,文章提出采用模拟电路来仿真参数可调非线性双稳态系统,并实现对双模噪声中信号的检测.首先利用PC提供控制信号,经串行口传输至单片机,单片机经过适当的换算后,再通过I2C总线控制数字电位器,通过改变电位器的抽头位置,能方便地改变其分压系数,从而灵活调节系统参数.当噪声、信号和非线性系统的达到某一协同作用,系统将部分噪声能量转化为信号能量,就会产生最大共振峰,从而将淹没在噪声中的被测信号检测出来.仿真表明,该方法能够有效抑制双模噪声,提取出信噪比较高的有用信号.In order to avoid the system output divergence caused by the sampling frequency, this paper puts forward the analog circuit to simulate the parameters adjustable nonlinear bistable system and realizes the detection of signal in the background of bimodal noise. Firstly, PC provides the control signal, which is by the serial port transmission to the microcontroller. The control signal is appropriately transformed, and then through the bus controls digital potentiometer. By changing the tap position potentiometer can easily change its partial pressure coefficient, thus it realizes the flexibility to adjust the system parameters. When the noise, signal and nonlinear system achieve a synergistic effect, the system will be part of the noise energy into signal energy and have the largest resonance peak so that it will detect the measured signal, which is drowned in the noise. Simulation results show that this method can effectively restrain the bimodal noise and extract the useful signal with high SNR.

关 键 词：双模噪声 参数可调 随机共振 检测 

分 类 号：TN911[电子电信—通信与信息系统]