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

  更多相關文章： 紅外光幕靶 互相關測時 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域具有重要的地位,高精度測時方法是該領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法實現測時,但速度較高的彈丸往往會產生彈頭波等激波,使測時精度大大降低,為了解決上述問題,本文設計了基于互相關測時的實時測速系統(tǒng)。在傳統(tǒng)互相關算法和廣義互相關算法的研究基礎上,建立了互相關測時的MATLAB仿真模型;通過仿真模擬脈沖計數法測時、傳統(tǒng)互相關和廣義互相關測時,證實了互相關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完成互相關測時可以使運算量大大減少,適合實時測量系統(tǒng)的應用。設計的測時模塊結合CPLD的硬件測時模塊和互相關算法測時分析,CPLD測時控制AD采集時間長度和參與互相關運算的離散信號序列長度。在互相關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,提高運算速度;三點插值擬合有利于提高測時精度。采用ARM芯片設計的AD采集模塊經多次數據采集,AD轉換精度滿足系統(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,在測速范圍內具有較高精度,滿足各項指標的要求。
[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.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN216

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