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  本文關(guān)鍵詞：基于ARM的互相關(guān)紅外測速系統(tǒng)研究　出處：《南京理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 紅外光幕靶 互相關(guān)測時 二次峰值檢索 實時彈丸測速系統(tǒng)

【摘要】：紅外測速光幕靶在測量彈丸速度領(lǐng)域具有重要的地位,高精度測時方法是該領(lǐng)域研究的主要方向之一。目前在該類系統(tǒng)中采用最多的是脈沖計數(shù)法實現(xiàn)測時,但速度較高的彈丸往往會產(chǎn)生彈頭波等激波,使測時精度大大降低,為了解決上述問題,本文設(shè)計了基于互相關(guān)測時的實時測速系統(tǒng)。在傳統(tǒng)互相關(guān)算法和廣義互相關(guān)算法的研究基礎(chǔ)上,建立了互相關(guān)測時的MATLAB仿真模型;通過仿真模擬脈沖計數(shù)法測時、傳統(tǒng)互相關(guān)和廣義互相關(guān)測時,證實了互相關(guān)算法在測時方面具有更高的精度,且具有平滑噪聲的作用,能減少噪聲和其他干擾對測時的影響。快速傅里葉變換FFT完成互相關(guān)測時可以使運算量大大減少,適合實時測量系統(tǒng)的應(yīng)用。設(shè)計的測時模塊結(jié)合CPLD的硬件測時模塊和互相關(guān)算法測時分析,CPLD測時控制AD采集時間長度和參與互相關(guān)運算的離散信號序列長度。在互相關(guān)算法測時分析時采用二次搜索峰值的方法和三點插值擬合函數(shù)的方法確定渡越時間,二次搜索峰值的方法可以減少搜索峰值的次數(shù),提高運算速度;三點插值擬合有利于提高測時精度。采用ARM芯片設(shè)計的AD采集模塊經(jīng)多次數(shù)據(jù)采集,AD轉(zhuǎn)換精度滿足系統(tǒng)要求,且節(jié)省了開發(fā)時間和費用,并且使用帶有浮點運算的處理器具有更短的運算時間。最后通過設(shè)計對比試驗的方式,驗證了該系統(tǒng)的可行性,在測速范圍內(nèi)具有較高精度,滿足各項指標(biāo)的要求。
[Abstract]:Infrared velocimetry screen target plays an important role in the field of projectile velocity measurement. High precision time measurement method is one of the main research directions in this field. At present, pulse counting method is widely used in this kind of system. However, projectiles with high speed often produce shock waves such as warhead waves, which greatly reduce the precision of time measurement. In order to solve the above problems. In this paper, a real-time velocity measurement system based on cross-correlation time is designed. Based on the research of traditional cross-correlation algorithm and generalized cross-correlation algorithm, the MATLAB simulation model of cross-correlation time is established. By simulating the pulse counting method, the traditional cross-correlation and generalized cross-correlation are used to verify that the cross-correlation algorithm has higher accuracy and smoother noise. It can reduce the influence of noise and other interference on the time measurement. The fast Fourier transform (FFT) can reduce the computation greatly when it completes the cross-correlation test. It is suitable for the application of real time measurement system. The designed time measuring module is combined with the hardware time measurement module of CPLD and the time measurement analysis of cross correlation algorithm. The length of AD acquisition time and the length of discrete signal sequence involved in cross-correlation operation are controlled by CPLD. The method of quadratic searching peak value and the method of three-point interpolation fitting function are used in the time measurement analysis of cross-correlation algorithm. Transit time. The method of second searching peak value can reduce the times of searching peak value and improve the operation speed. Three-point interpolation fitting is helpful to improve the precision of measuring time. The AD acquisition module designed by ARM chip can meet the system requirements by multiple data acquisition and AD conversion accuracy, and saves the development time and cost. And the processor with floating-point operation has shorter operation time. Finally, the feasibility of the system is verified by designing a comparative test, which has a high accuracy in the range of speed measurement. Meet the requirements of each target.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN216

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