【摘要】：壓縮感知理論是一個介于數(shù)學(xué)與信息處理領(lǐng)域間的熱門研究前沿,它能夠在遠(yuǎn)小于奈奎斯特采樣率的情況下實現(xiàn)信號采集,并能從少量的非相關(guān)測量值中高效率重構(gòu)出原始信號,使其在無線傳感器網(wǎng)絡(luò)、數(shù)據(jù)重構(gòu)、圖像處理、雷達(dá)成像等方面的應(yīng)用越來越廣泛。測量矩陣是壓縮感知理論步入實踐的關(guān)鍵,它對少量測量值的獲取和原始信號的準(zhǔn)確重構(gòu)起著舉足輕重的作用,但因其硬件實現(xiàn)的高成本和復(fù)雜度,嚴(yán)重制約了壓縮感知的推廣應(yīng)用。毫米波具有良好的穿透性能和較強(qiáng)的抗干擾能力,使得毫米波成像技術(shù)在安檢、探測、反恐等領(lǐng)域擁有無可比擬的優(yōu)勢。因此,利用壓縮感知理論的采樣特點(diǎn),研究出一種易于硬件實現(xiàn)、復(fù)雜度和成本較低、重構(gòu)效率較高的毫米波成像體制具有及其重要的現(xiàn)實意義。本文在充分研究壓縮感知理論和毫米波成像技術(shù)的基礎(chǔ)上,圍繞構(gòu)建毫米波壓縮感知成像體制,在以下幾個方面進(jìn)行了深入探討:1、研究了具有帶通/帶阻特性的頻率選擇表面理論,并基于PIN二極管開關(guān),設(shè)計出可調(diào)環(huán)路型FSS結(jié)構(gòu)單元,研究了偏置電路對FSS結(jié)構(gòu)的影響。仿真結(jié)果表明,在頻率為37.5GHz的毫米波輻射下,利用PIN二極管控制這種FSS結(jié)構(gòu)單元的開/關(guān)狀態(tài),其對應(yīng)呈現(xiàn)出帶通/帶阻特性,實現(xiàn)單元處毫米波傳輸特性的控制。2、針對測量矩陣在毫米波壓縮感知成像體制中的關(guān)鍵作用,仿真設(shè)計出可隨機(jī)控制的10×10 FSS掩膜板結(jié)構(gòu),并將這種隨機(jī)掩膜板放置于毫米波天線上,則可通過這種口徑的掩模板獲取多次不相關(guān)測量,構(gòu)造出有效測量矩陣。本文通過軟件仿真對不同結(jié)構(gòu)的口徑進(jìn)行了200次有效測量,構(gòu)造了一個200×256測量矩陣,分析了測量矩陣的性能。3、在研究毫米波壓縮感知成像原理的基礎(chǔ)上,利用重構(gòu)算法對大小為16×16的原始圖像進(jìn)行恢復(fù)重構(gòu),驗證了本文所提成像體制的可行性。仿真結(jié)果表明,這種成像方法易于從硬件上實現(xiàn),復(fù)雜度和成本較低,能以較低測量次數(shù)實現(xiàn)較好的圖像重構(gòu)效果。
[Abstract]:The theory of compressed sensing is a hot research frontier between mathematics and information processing. It can realize signal acquisition when the sampling rate is far less than Nyquist sampling rate. And it can efficiently reconstruct the original signal from a small number of non-correlated measurements, making it more and more widely used in wireless sensor networks, data reconstruction, image processing, radar imaging and so on. Measurement matrix is the key of compression sensing theory in practice. It plays an important role in obtaining a small number of measurement values and accurately reconstructing the original signal. However, because of the high cost and complexity of its hardware implementation, the measurement matrix plays an important role in the acquisition of a small amount of measurement value and the accurate reconstruction of the original signal. It seriously restricts the application of compression perception. Millimeter wave has good penetration performance and strong anti-jamming ability, which makes millimeter wave imaging technology have unparalleled advantages in security inspection, detection, anti-terrorism and other fields. Therefore, it is of great practical significance to develop a millimeter wave imaging system, which is easy to implement in hardware, low complexity and cost, and high reconstruction efficiency, based on the sampling characteristics of compression sensing theory. Based on the research of compression sensing theory and millimeter wave imaging technology, this paper constructs a millimeter wave compression sensing imaging system. The following aspects are discussed in detail: 1. The frequency selective surface theory with band-pass / band-stop characteristics is studied. Based on the PIN diode switch, a tunable loop type FSS structure unit is designed, and the influence of bias circuit on the FSS structure is studied. The simulation results show that the PIN diode is used to control the on-off state of the FSS structure unit under millimeter wave radiation with frequency 37.5GHz, and the corresponding band-pass / band-stop characteristic is presented. To realize the control of millimeter wave transmission characteristics at the unit. Aiming at the key role of measurement matrix in millimeter wave compression sensing imaging system, a random control 10 脳 10 FSS mask structure is designed by simulation. When the random mask is placed on the millimeter-wave antenna, the effective measurement matrix can be constructed by using this aperture mask template to obtain several independent measurements. In this paper, 200 effective measurements of the aperture of different structures are carried out by software simulation, and a 200 脳 256 measurement matrix is constructed. The performance of the measurement matrix is analyzed. On the basis of studying the principle of millimeter-wave compression sensing imaging, The reconstruction algorithm is used to reconstruct the original image with the size of 16 脳 16, which verifies the feasibility of the proposed imaging scheme. The simulation results show that this imaging method is easy to be implemented in hardware, with low complexity and cost, and can achieve better image reconstruction effect with lower measurement times.
【學(xué)位授予單位】：國防科學(xué)技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TP391.41

【參考文獻(xiàn)】

相關(guān)期刊論文 前6條

1 方紹正;鄧靜;;單像素成像系統(tǒng)的場景監(jiān)視算法[J];量子電子學(xué)報;2015年01期

2 喬蕊;張錦華;;運(yùn)動物體的壓縮感知成像[J];量子電子學(xué)報;2015年01期

3 嚴(yán)奉霞;王澤龍;朱炬波;劉吉英;;壓縮感知理論與光學(xué)壓縮成像系統(tǒng)[J];國防科技大學(xué)學(xué)報;2014年02期

4 張琳昊;張亮亮;張存林;;基于壓縮傳感的單點(diǎn)太赫茲成像[J];首都師范大學(xué)學(xué)報(自然科學(xué)版);2012年06期

5 馬駿;李少毅;梁志毅;閆杰;;基于壓縮傳感理論的單像素成像系統(tǒng)設(shè)計[J];紅外技術(shù);2011年08期

6 戴新,徐之材;90—115GHz超導(dǎo)SIS接收機(jī)研制成功[J];中國科學(xué)院院刊;2000年04期

相關(guān)博士學(xué)位論文 前1條

1 張光鋒;毫米波輻射特性及成像研究[D];華中科技大學(xué);2005年

相關(guān)碩士學(xué)位論文 前4條

1 戚福偉;毫米波成像快速掃描分析[D];南京理工大學(xué);2013年

2 楊潔;無源毫米波超分辨成像技術(shù)研究[D];電子科技大學(xué);2011年

3 韓波;壓縮傳感技術(shù)在毫米波無源成像中的應(yīng)用研究[D];電子科技大學(xué);2011年

4 莊重;毫米波成像準(zhǔn)光學(xué)技術(shù)研究[D];哈爾濱工業(yè)大學(xué);2009年

，

本文編號：2254739