提出了一種建立在信號模型基礎(chǔ)上的高抗干擾超聲波距離測量相關(guān)法. 通過對超聲波傳感器頻率特性的分析而求得一個十分簡單的超聲波匹配電路. 為了降低所處理的信號頻率采用了調(diào)制與解調(diào)技術(shù). 由于偽隨機(jī)二進(jìn)制信號PRBS 和超聲波傳感器的特性,可用方波載波信號來有效地代替正弦波載波信號. 還描述了用于提高采樣頻率的線形內(nèi)插法和用于抑制分散回聲的均值法.
關(guān)鍵詞: 相關(guān)法超聲波距離測量技術(shù); 超聲波傳感器; 調(diào)制解調(diào); 信號處理
Abstract : This paper int roduces the correlative robust distance measurement approaches based on the signal models. The very simple match circuit s of the ult rasonic sensors were obtained by analyzing the f requency properties of the ult rasonic sensors. The modulation and demodulation were used to reduce the f requency of the processed signals. The carrier signals were substituted with the rectangle signals because of the properties of the pseudo random binary sequences (PRBS) and the ult rasonic sensors. This paper describes also the linear in2 terpolation for the increase of the sampling f requency and the average method for the suppression of the scat2 tering echoes.
Key words : correlative ult rasonic distance measurement approaches ; ult rasonic sensors ; modulation and de2 modulation ; signal processing