本文選題：合成孔徑激光雷達(dá)　切入點(diǎn)：運(yùn)動(dòng)平臺(tái)　出處：《中國(guó)科學(xué)院研究生院(上海技術(shù)物理研究所)》2016年博士論文　論文類(lèi)型：學(xué)位論文

【摘要】：合成孔徑激光雷達(dá)是合成孔徑雷達(dá)與激光雷達(dá)的結(jié)合,可以突破微波的衍射極限,是實(shí)現(xiàn)厘米量級(jí)超高分辨率的唯一光學(xué)手段,在遙感領(lǐng)域的應(yīng)用前景很廣闊。由于激光波長(zhǎng)較短,合成孔徑激光雷達(dá)對(duì)于平臺(tái)振動(dòng)非常敏感,所以對(duì)運(yùn)動(dòng)平臺(tái)成像的算法研究是重要的課題。論文主要針對(duì)基于運(yùn)動(dòng)平臺(tái)的合成孔徑激光雷達(dá)成像算法進(jìn)行了深入研究。建立了基于相位編碼體制的合成孔徑激光雷達(dá)仿真模型,分別由實(shí)測(cè)的POS數(shù)據(jù)分析了機(jī)載環(huán)境下航線(xiàn)偏移以及實(shí)驗(yàn)室桌面系統(tǒng)對(duì)平臺(tái)機(jī)械振動(dòng)帶來(lái)的光程變化進(jìn)行了觀(guān)測(cè)與分析。根據(jù)分析結(jié)果在系統(tǒng)上提出使用距離向交錯(cuò)的差分合成孔徑激光雷達(dá)接收鏡頭抑制平臺(tái)振動(dòng)的方法,并對(duì)該方法有效性進(jìn)行了仿真。此外,在算法上針對(duì)運(yùn)動(dòng)平臺(tái)帶來(lái)的非理想光程變化,提出采用優(yōu)化算法對(duì)相位誤差進(jìn)行抑制的方法,并且采用壓縮之后的差分?jǐn)?shù)據(jù)1-范數(shù)當(dāng)作優(yōu)化算法的評(píng)價(jià)函數(shù)。利用桌面成像系統(tǒng)和外場(chǎng)演示系統(tǒng)實(shí)驗(yàn)的數(shù)據(jù)進(jìn)行了成像,驗(yàn)證了優(yōu)化算法進(jìn)行相位補(bǔ)償?shù)挠行�。論文的�?chuàng)新點(diǎn)主要有以下幾個(gè)方面:1對(duì)距離向編碼壓縮進(jìn)行研究,首次提出在激光雷達(dá)中使用利用M矩陣矩陣相乘的辦法實(shí)現(xiàn)脈沖壓縮,對(duì)旁瓣進(jìn)行壓制。2首次提出距離向上交錯(cuò)的差分合成孔徑激光雷達(dá)接收系統(tǒng),并利用實(shí)測(cè)POS數(shù)據(jù)對(duì)該系統(tǒng)進(jìn)行了仿真,為差分合成孔徑激光雷達(dá)的工程化提供了可能。3首次提出采用lerangd多項(xiàng)式對(duì)非理想光程變化建模,使用優(yōu)化算法對(duì)回波相位進(jìn)行補(bǔ)償?shù)姆椒ㄒ砸种朴煞抢硐牍獬套兓瘞?lái)的相位誤差,利用壓縮之后的差分?jǐn)?shù)據(jù)1-范數(shù)作為壓縮質(zhì)量評(píng)價(jià)函數(shù)。
[Abstract]:Synthetic Aperture Lidar (SAR) is a combination of SAR and Lidar, which can break through the diffraction limit of microwave, and is the only optical means to achieve ultra-high resolution in centimeter order. Because of the short wavelength of laser, synthetic aperture lidar is very sensitive to platform vibration. Therefore, it is an important task to study the imaging algorithm of moving platform. This paper mainly focuses on the synthetic aperture lidar imaging algorithm based on moving platform, and establishes the synthetic aperture based on phase coding system. Lidar simulation model, The path offset in airborne environment and the optical path change caused by mechanical vibration of platform are observed and analyzed by the measured POS data respectively. Based on the analysis results, the range direction of the system is proposed. Staggered differential synthetic Aperture Lidar receiver lens suppression of platform vibration, The effectiveness of the method is simulated. In addition, an optimization algorithm is proposed to suppress the phase error in view of the non-ideal optical path changes brought by the moving platform. The compressed difference data 1-norm is used as the evaluation function of the optimization algorithm, and the experimental data of the desktop imaging system and the field demonstration system are used to image the image. The effectiveness of the optimized algorithm for phase compensation is verified. The main innovations of this paper are as follows: 1. It is the first time to use M-matrix matrix multiplication method to realize pulse compression in lidar, and to suppress sidelobe .2 for the first time, a differential synthetic aperture lidar receiving system with range up interleaving is proposed for the first time. The system is simulated by using the measured POS data, which provides the possibility of using lerangd polynomial to model the non-ideal optical path variation of differential synthetic aperture lidar (DSAR) for the first time. An optimization algorithm is used to compensate the echo phase to suppress the phase error caused by the variation of the non-ideal optical path. The compressed difference data 1-norm is used as the compression quality evaluation function.
【學(xué)位授予單位】：中國(guó)科學(xué)院研究生院(上海技術(shù)物理研究所)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：TN957.52

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