本文關鍵詞： 激光雷達 經(jīng)典鬼成像 計算鬼成像 壓縮感知 壓縮鬼成像　出處：《南京理工大學》2017年碩士論文　論文類型：學位論文

【摘要】：傳統(tǒng)的激光雷達在遠距離目標探測中很難同時滿足成像速度、靈敏度以及抗干擾能力等方面的性能需要。然而,鬼成像理論可以使得激光雷達具備更強的抗干擾性能;壓縮感知理論則可以大大減少采樣次數(shù),提高成像速度。本文將這兩者結合,研究了壓縮鬼成像算法,并基于該理論搭建了一套雷達樣機系統(tǒng),探索了它在實際目標探測成像中的應用,具有更加優(yōu)異的成像性能。主要內(nèi)容包括:1)經(jīng)典鬼成像理論的數(shù)學推導:本文通過符合測量和二階關聯(lián)理論,推導了鬼成像的數(shù)學關系式;研究了贗熱光源的數(shù)學表達,闡釋了其具有和真熱光源相似的特性,證明了贗熱光源鬼成像的可行性。2)壓縮鬼成像算法的原理:本文首先從統(tǒng)計學角度,闡述了計算鬼成像的實現(xiàn)原理;接著,解釋了壓縮感知理論,指出常見探測目標滿足壓縮感知所需要的稀疏性條件,進而推導了 CS算法在計算鬼成像中應用的可行性,就此提出壓縮鬼成像算法;最后,通過二值目標和灰度目標的仿真以及實驗,驗證了該算法。3)稀疏約束鬼雷達的樣機研制:本文基于壓縮鬼成像算法搭建了一套激光雷達樣機系統(tǒng),該系統(tǒng)結構精簡、原理清晰。通過選取遠處靶標進行探測表明,稀疏約束鬼雷達在成像速度和質量等多個方面相對于傳統(tǒng)激光雷達具有明顯優(yōu)勢。4)鬼成像中的散斑正交化研究:贗熱光源中毛玻璃形成的散斑場呈復高斯圓分布,所以對應的散斑強度滿足二項式分布,雖然滿足算法需要,但其非正交的特性限制了成像質量。因此,提出一種散斑正交化的方法,將二項式分布轉換為正交分布。該方法在不增加額外采樣時間的條件下,顯著地提高了重建目標的信噪比。
[Abstract]:It is difficult for traditional lidar to simultaneously meet the requirements of imaging speed, sensitivity and anti-jamming ability in long-range target detection. Ghost imaging theory can make lidar have stronger anti-jamming performance. Compression sensing theory can greatly reduce the number of samples and improve the imaging speed. In this paper, the compression ghost imaging algorithm is studied, and a radar prototype system is built based on the theory. Its application in the actual target detection imaging is explored, and it has better imaging performance. The main contents include the mathematical derivation of the classical ghost imaging theory: the coincidence measurement and the second-order correlation theory are adopted in this paper. The mathematical relation of ghost imaging is deduced. The mathematical expression of pseudo thermal light source is studied, and its characteristics similar to that of true heat source are explained. The feasibility of ghost imaging with pseudo thermal light source. 2) the principle of compressed ghost imaging algorithm is proved. The principle of calculating ghost imaging is described. Then, the theory of compressed sensing is explained, and the sparsity condition of compressed sensing is pointed out. Then, the feasibility of CS algorithm in calculating ghost imaging is deduced. In this paper, a compressed ghost imaging algorithm is proposed. Finally, through the simulation and experiment of binary target and gray target, it is verified that the algorithm. 3) the prototype of sparse constrained ghost radar is developed. In this paper, a set of laser radar prototype system based on compressed ghost imaging algorithm is built. The structure of the system is simple and the principle is clear. Sparse constrained ghost radar has obvious advantages over conventional lidar in imaging speed and quality. Speckle Orthogonalization in Ghost Imaging: the speckle field formed by the ground glass in the pseudo-thermal light source is distributed in a complex Gao Si circle. Therefore, the corresponding speckle intensity meets the binomial distribution, although it meets the needs of the algorithm, but its non-orthogonal characteristics limit the imaging quality. Therefore, a speckle orthogonalization method is proposed. The binomial distribution is transformed into orthogonal distribution, and the SNR of the reconstructed target is significantly improved without adding extra sampling time.
【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】：TN958.98

【參考文獻】

相關期刊論文 前10條

1 楊照華;李大鵬;彭宏韜;吳令安;;基于閾值分割的并行壓縮鬼成像方法[J];光學技術;2016年04期

2 梅笑冬;龔文林;嚴毅;韓申生;曹清;;可預置強度關聯(lián)激光三維成像雷達實驗研究[J];中國激光;2016年07期

3 韓笑純;黃靖正;方晨;曾貴華;;群速度色散對于糾纏光場二階關聯(lián)函數(shù)影響的研究[J];物理學報;2015年07期

4 駱社周;習曉環(huán);王成;;激光雷達遙感在文化遺產(chǎn)保護中的應用[J];遙感技術與應用;2014年06期

5 仲亞軍;劉嬌;梁文強;趙生妹;;針對多散斑圖的差分壓縮鬼成像方案研究[J];物理學報;2015年01期

6 趙一鳴;李艷華;商雅楠;李靜;于勇;李涼海;;激光雷達的應用及發(fā)展趨勢[J];遙測遙控;2014年05期

7 任越美;張艷寧;李映;;壓縮感知及其圖像處理應用研究進展與展望[J];自動化學報;2014年08期

8 劉效勇;曹益平;盧佩;;基于壓縮感知的光學圖像加密技術研究[J];光學學報;2014年03期

9 王強;李佳;沈毅;;壓縮感知中確定性測量矩陣構造算法綜述[J];電子學報;2013年10期

10 焦佳;趙成強;崔麗君;徐文東;;基于隨機相位板掃描的可重復贗熱光源研究[J];光學學報;2013年09期

相關碩士學位論文 前2條

1 尚杰;熱光源高階關聯(lián)成像質量研究[D];遼寧大學;2014年

2 張二峰;二階和高階關聯(lián)成像研究[D];國防科學技術大學;2010年

，

本文編號：1469469