本文選題：煙塵回波特性　切入點(diǎn)：抗干擾分析　出處：《西安工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：脈沖式激光探測(cè)系統(tǒng)在很多領(lǐng)域都有著非常廣泛的應(yīng)用,然而在一些特定環(huán)境下,空氣中漂浮的煙塵粒子和激光光束之間產(chǎn)生的互相影響,特別是煙塵粒子會(huì)對(duì)激光光束發(fā)生吸收和散射,導(dǎo)致激光收發(fā)系統(tǒng)性能的下降甚至失效,從而造成嚴(yán)重的誤判。本文針對(duì)這種情況,首先對(duì)激光在煙塵中的回波特性進(jìn)行了深入探討和研究,其次通過對(duì)其結(jié)果的分析,針對(duì)性的提出了激光抗煙塵干擾電路的設(shè)計(jì)。首先,文章對(duì)光的散射理論做了深入的探討,著重研究瑞利和米氏散射理論,分析了不同煙塵粒徑下激光的散射機(jī)理,并采用Monte Carlo方法,對(duì)單次和多次散射理論進(jìn)行了公式推導(dǎo)。其次,設(shè)計(jì)了激光近距探測(cè)的收發(fā)系統(tǒng),對(duì)其各模塊的參數(shù)和指標(biāo)進(jìn)行了分析和計(jì)算,并搭建了定量煙塵顆粒分析試驗(yàn)箱,并對(duì)煙塵干擾形成波形特征進(jìn)行深入研究,建立了激光在煙塵環(huán)境下的傳輸模型。同時(shí),建立物體目標(biāo)模型,通過Matlab軟件對(duì)其回波進(jìn)行模擬仿真,通過兩者比較,得出抗煙塵干擾的理論依據(jù)。在信號(hào)處理模塊,從激光抗干擾的角度出發(fā),針對(duì)前面歸納的特征,分別提出了脈寬測(cè)量和時(shí)間門選通復(fù)合識(shí)別技術(shù)、閾值電壓自適應(yīng)技術(shù)、時(shí)間中心捕獲法,并借助于ISE對(duì)信號(hào)處理各功能模塊進(jìn)行編程設(shè)計(jì)。通過ISM,編寫激勵(lì)文件,對(duì)其進(jìn)行測(cè)試,使其各模塊功能的可行性都得到了很好的驗(yàn)證。在信號(hào)確認(rèn)模塊,因?yàn)閭坞S機(jī)序列優(yōu)異的抗干擾性能,通過采用延時(shí)相關(guān)的方法,對(duì)其進(jìn)行峰值檢測(cè),達(dá)到了課題預(yù)期的效果。
[Abstract]:Pulse laser detection systems are widely used in many fields, but in certain environments, the interaction between aerosol particles floating in the air and laser beams, In particular, the soot particles will absorb and scatter the laser beam, which will lead to the degradation or even failure of the laser transceiver system, thus causing serious misjudgment. First of all, the characteristics of laser echo in smoke dust are deeply discussed and studied. Secondly, through the analysis of the results, the design of laser anti-soot interference circuit is put forward. Firstly, the scattering theory of light is deeply discussed in this paper. The Rayleigh and Michelson scattering theories are studied emphatically, the scattering mechanism of laser under different particle size of smoke is analyzed, and the single and multiple scattering theories are deduced by Monte Carlo method. Secondly, the receiving and sending system of laser short range detection is designed. The parameters and indexes of each module are analyzed and calculated, and the quantitative smoke particle analysis test box is built, and the waveform characteristics of smoke interference are deeply studied, and the laser transmission model in smoke environment is established. The object target model is established, and its echo is simulated by Matlab software. Through the comparison of the two, the theoretical basis of anti-soot interference is obtained. In the signal processing module, from the point of view of laser anti-jamming, aiming at the characteristics summarized above, The techniques of pulse width measurement and time gate gating combined identification, threshold voltage adaptive technology, time center acquisition method are put forward, and the signal processing function modules are programmed by ISE. In the signal confirmation module, because of the excellent anti-interference performance of pseudorandom sequence, the peak value detection is carried out by using the method of time-delay correlation. The expected effect of the project is achieved.
【學(xué)位授予單位】：西安工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN24

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