【摘要】：艦船目標(biāo)的逆合成孔徑雷達(dá)(Inverse Synthetic Aperture Radar-ISAR)成像主要利用雷達(dá)與艦船目標(biāo)的相對運(yùn)動而形成二維圖像,是當(dāng)今海內(nèi)外學(xué)者們研究熱點(diǎn)之一,具有廣泛的軍事和民用價(jià)值,可以用于軍事偵察,海面目標(biāo)的識別與探測,海面船只的引導(dǎo)和海面上的技術(shù)支持等工作。艦船目標(biāo)除了沿其航線方向的直線運(yùn)動以外,受海浪的影響會產(chǎn)生不同方向的轉(zhuǎn)動。而海面情況的復(fù)雜性,增加了獲得高質(zhì)量艦船目標(biāo)ISAR的圖像的難度。本文對艦船目標(biāo)的ISAR成像的不同場景進(jìn)行研究,主要內(nèi)容如下:1、分析了兩種最基本的相對運(yùn)動方式:理想轉(zhuǎn)動模型和直線運(yùn)動模型。轉(zhuǎn)動模型成像是ISAR成像的基礎(chǔ),直線運(yùn)動可以通過適當(dāng)?shù)倪\(yùn)動補(bǔ)償轉(zhuǎn)化為轉(zhuǎn)動運(yùn)動。2、分析了艦船目標(biāo)運(yùn)動的特點(diǎn),完成了艦船目標(biāo)三種主要的的轉(zhuǎn)動(pitch,roll,yaw)形式的建模,研究了傳統(tǒng)ISAR成像的R-D算法。并進(jìn)行了仿真實(shí)驗(yàn),實(shí)驗(yàn)結(jié)果表明了R-D成像算法可以得到比較高質(zhì)量的沿徑向運(yùn)動和小轉(zhuǎn)角下轉(zhuǎn)動的艦船目標(biāo)成像結(jié)果。3、分析了艦船目標(biāo)平動對ISAR成像造成的模糊影響,并研究了距離對準(zhǔn)算法和相位補(bǔ)償。提出了改進(jìn)的單特顯點(diǎn)相位補(bǔ)償算法,實(shí)驗(yàn)表明,相比多普勒中心追蹤法和單特顯點(diǎn)法,該方法有效的提高了ISAR成像的圖像銳利程度和圖像對比度。4、針對大轉(zhuǎn)角的艦船目標(biāo),研究了時(shí)頻分析理論以及基于時(shí)頻分布的ISAR成像,該方法就是利用時(shí)頻分布替代傅里葉變換來進(jìn)行雷達(dá)成像。該方法可以獲得更加清晰的目標(biāo)圖像。實(shí)驗(yàn)結(jié)果表明基于時(shí)頻分布的艦船目標(biāo)成像方法明顯優(yōu)于傳統(tǒng)的R-D算法。
[Abstract]:The inverse synthetic Aperture Radar (Inverse Synthetic Aperture Radar-ISAR) imaging of ship targets mainly uses the relative motion of radar and ship targets to form two-dimensional images, which is one of the research hotspots at home and abroad, and has a wide range of military and civil value. It can be used in military reconnaissance, target identification and detection, ship guidance and technical support. In addition to the linear motion along the course of the ship, the ship will rotate in different directions under the influence of the waves. The complexity of sea surface makes it more difficult to obtain high quality ISAR images of ship targets. In this paper, different scenes of ship target ISAR imaging are studied. The main contents are as follows: 1. Two basic relative motion modes: ideal rotation model and linear motion model are analyzed. Rotational model imaging is the basis of ISAR imaging, and linear motion can be transformed into rotational motion by proper motion compensation. 2. The characteristics of ship target motion are analyzed, and the modeling of three main pitch,roll,yaw forms of ship target is completed. The R-D algorithm of traditional ISAR imaging is studied. The simulation results show that R-D imaging algorithm can obtain high quality imaging results of ship targets with radial motion and rotation at small rotation angles. 3. The fuzzy effect of ship target translation on ISAR imaging is analyzed. The range alignment algorithm and phase compensation are also studied. An improved single-point phase compensation algorithm is proposed. The experimental results show that compared with the Doppler centroid tracking method and the single explicit point method, this method can effectively improve the sharpness and contrast of the image of ISAR imaging, aiming at the ship target with large turning angle. The theory of time-frequency analysis and ISAR imaging based on time-frequency distribution are studied. The method is to use time-frequency distribution instead of Fourier transform for radar imaging. This method can get clearer target image. The experimental results show that the ship target imaging method based on time-frequency distribution is superior to the traditional R-D algorithm.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN957.52

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 保錚,鄧文彪,楊軍;ISAR成像處理中的一種運(yùn)動補(bǔ)償方法[J];電子學(xué)報(bào);1992年06期

，

本文編號：2269393