基于隨機共振的微弱信號檢測
Weak Signal Detection Based on Stochastic Resonance
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摘要: 在強噪聲背景下,基于WV和Hough變換的正弦和線性調(diào)頻信號檢測方法的性能嚴重下降,為克服這種不足,該文在深入分析FHN隨機共振系統(tǒng)參數(shù)對濾波能力影響的基礎(chǔ)上,提出一種基于隨機共振系統(tǒng)檢測微弱正弦和線性調(diào)頻信號的方法。首先借助FHN隨機共振模型進行濾波,在此基礎(chǔ)上進行WV和Hough變換,將信號的檢測問題轉(zhuǎn)換為時頻圖中的直線檢測問題。實驗證實,該方法具有較好的效果。
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關(guān)鍵詞:
- 微弱信號檢測;隨機共振;WV變換;Hough變換
Abstract: In a heavy noise,the method based on Wigner Ville (WV) and Hough transformations has the poor performance of detecting the weak signal. To improve it, this paper analyzes the influence of the Fitz Hugh Nagumo(FHN) models parameters on its filtering characteristics, and presents a method of detecting weak sinusoid and LFM signals based on FHN model of stochastic resonance. Firstly ,the received signal is filtered by FHN model ,and transformed by WV and Hough in turns, thus whether a signal is present in noise is determined according to whether there is a line in time-frequency picture. Finally, the validity of this method is well verified by the experiments. -
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