通信技术
通信技術
통신기술
COMMUNICATIONS TECHNOLOGY
2013年
10期
26-29
,共4页
随机共振%门限值%微弱信号检测%频率调制
隨機共振%門限值%微弱信號檢測%頻率調製
수궤공진%문한치%미약신호검측%빈솔조제
stochastic resonance%threshold value%weak signal detection%frequency modulation
针对频率调制中存在的门限效应问题，提出了利用非线性科学领域的随机共振原理来降低门限值。首先将接收到的频率调制信号通过一低通滤波器，提取出其中的低频分量，然后输入非线性双稳态系统中，通过调节载波频率，使得系统发生随机共振，多次调节载波频率，可以有效的检测出有用信号的频率。理论分析和仿真结果表明该方法能有效降低频率调制的门限值，并且克服了随机共振不能检测大频率信号的缺点。
針對頻率調製中存在的門限效應問題，提齣瞭利用非線性科學領域的隨機共振原理來降低門限值。首先將接收到的頻率調製信號通過一低通濾波器，提取齣其中的低頻分量，然後輸入非線性雙穩態繫統中，通過調節載波頻率，使得繫統髮生隨機共振，多次調節載波頻率，可以有效的檢測齣有用信號的頻率。理論分析和倣真結果錶明該方法能有效降低頻率調製的門限值，併且剋服瞭隨機共振不能檢測大頻率信號的缺點。
침대빈솔조제중존재적문한효응문제，제출료이용비선성과학영역적수궤공진원리래강저문한치。수선장접수도적빈솔조제신호통과일저통려파기，제취출기중적저빈분량，연후수입비선성쌍은태계통중，통과조절재파빈솔，사득계통발생수궤공진，다차조절재파빈솔，가이유효적검측출유용신호적빈솔。이론분석화방진결과표명해방법능유효강저빈솔조제적문한치，병차극복료수궤공진불능검측대빈솔신호적결점。
Aiming at the threshold effects in frequency modulation,the stochastic resonance theory of non-linear sciences is proposed to reduce the threshold value. Firstly, by letting the received frequency-modu-lated signal pass a low-pass filter, the lower frequency component is thus extracted. Then the output en-ters a nonlinear bistable system, and by adjusting the carrier frequency, the stochastic resonance is pro-duced. The useful signal frequency can be effectively detected by repeatedly adjusting the carrier frequen-cy. Theoretical analysis and simulation results indicate that this method can effectively reduce the threshold value in frequency modulation and overcome the disadvantage that the stochastic resonance could not detect the high frequency signal.
