本文選題：激光雷達截面 + 有源濾波器�。� 參考：《西安電子科技大學》2014年碩士論文

【摘要】：激光雷達是激光技術和雷達技術相結合的產物,其分辨率高,抗干擾能力強,并且可以三維成像,被廣泛用于測距、測角、精確跟蹤、引信傳感、飛船導航、氣象測量等方面,在民用和軍事上都具有巨大的應用價值。本文首先分析了激光雷達截面的物理意義,給出了目標激光雷達截面的計算、測量原理與方法,從激光雷達截面的理論定義出發(fā),推導出普遍適用于各類激光測量系統(tǒng)和各種散射特性目標的基本測量方程,該方程利用激光雷達截面表征目標的激光散射特性。為了更精確地獲得激光雷達截面的測量數據,系統(tǒng)采用空間濾波方法以提高接收系統(tǒng)的信噪比,排除背景和噪聲的干擾。然后本文研究了用于激光雷達截面測量系統(tǒng)的有源濾波器的設計,并論述了雙二次濾波電路的相關理論,重點討論了雙二次有源帶通濾波電路的設計方法。隨后討論了雙二次濾波電路中RC元件和集成運算放大器增益變化的靈敏度,并求解出符合要求的雙二次有源帶通濾波電路參數。根據求解出的電路參數,對雙二次有源帶通濾波器進行仿真。最后本文提出了雙二次有源帶通濾波器中心頻率因受溫度影響發(fā)生漂移的穩(wěn)定策略及其原理,對比介紹了包括結型場效應管、模擬開關和電阻網絡及數字電位器在內的控制方法,著重介紹了基于數字電位器AD8400的程控增益系統(tǒng),并利用程控增益放大器設計和實現中心頻率可實時自動調節(jié)的帶通濾波器,實驗結果表明本文設計的濾波器通帶寬度達到22Hz,中心頻率可實時自動調節(jié),滿足實際需要。
[Abstract]:Lidar is the product of the combination of laser technology and radar technology. It has high resolution, strong anti-jamming ability, and can be used in 3D imaging. It is widely used in ranging, angle measurement, accurate tracking, fuze sensing, spacecraft navigation, meteorological measurement, etc. It has great application value in both civilian and military fields. In this paper, the physical meaning of laser radar cross section (LRCS) is analyzed, and the calculation, measurement principle and method of LRCS are given. The basic measurement equations for various laser measurement systems and targets with various scattering characteristics are derived. The laser scattering characteristics of the target are characterized by the laser radar cross section (LRCS). In order to obtain the measurement data of lidar cross section more accurately, the spatial filtering method is used to improve the signal-to-noise ratio of the receiving system and to eliminate the interference of background and noise. Then, the design of active filter used in lidar cross section measurement system is studied, and the theory of double secondary filter circuit is discussed, and the design method of double secondary active band-pass filter circuit is discussed emphatically. Then the sensitivity of the gain variation of RC components and integrated operational amplifiers in biquadratic filter circuit is discussed and the parameters of dual-quadratic active band-pass filter circuit are obtained. According to the calculated circuit parameters, the double secondary active band-pass filter is simulated. Finally, this paper presents a stability strategy and its principle for the drift of the center frequency of the dual-secondary active band-pass filter due to temperature, and compares and introduces the junction type field effect transistor (FET). The control methods of analog switch, resistance network and digital potentiometer are introduced in this paper. The program control gain system based on digital potentiometer (AD8400) is introduced, and the band pass filter which can adjust the center frequency in real time is designed and realized by using the program control gain amplifier. The experimental results show that the passband width of the filter designed in this paper can reach 22Hz and the center frequency can be automatically adjusted in real time to meet the practical needs.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN958.98

【參考文獻】

相關期刊論文 前1條

1 李鐵,閻煒,吳振森;雙向反射分布函數模型參量的優(yōu)化及計算[J];光學學報;2002年07期

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本文編號：1915538