1.The open-aperture and closed-aperture results show that SBN thin films exhibit a nonlinear optical response with the real and imaginary parts of the third-order nonlinear optical susceptibility being 4.139×10-7 esu and 1.104×10-7 esu, respectively.
利用Z扫描技术对薄膜的三阶非线性光学性质进行了测量,通过开孔(Open-aperture)和小孔(Close-aperture)的测量,计算出三阶非线性光学极化率的实部Rex(3)和虚部Imx(3)分别为4.139×10-7esu,1.104×10-7esu.
2.Synthetic Aperture Radar (SAR) is a kind of active microwave imaging radar, which utilizes the method of aperture synthesis to achieve high resolution in the azimuth direction.
合成孔径雷达(Synthetic Aperture Radar,SAR)是一种主动式的微波成像雷达，它利用孔径合成的方法获得方位向的高分辨率。
3.Synthetic aperture radar interferometry(InSAR) is a new technology to build the digital elevation model(DEM) and detect the tiny changes in the surface.
合成孔径雷达干涉测量(InSAR,Synthetic Aperture Radar)是一种获取地面数字高程模型(DEM)和探测地面微小形变的新技术。
4.Synthetic Aperture Radar (SAR), as a kind of active remote sensor, is a system that can scan and image earth surface object in a high resolution using its electromagnetic wave.
合成孔径雷达(Synthetic Aperture Radar,简称SAR)作为一种主动式传感器,是利用雷达本身发射的电磁波进行高分辨率成像的系统。
5.A novel autofocus algorithm for SAR(synthetic aperture radar) images is presented,which is based on DCT(discrete cosine transform).
研究了一种基于离散余弦变换(DCT,Discrete Cosine Transform)的SAR(Syn-thetic Aperture Radar)图像自聚焦算法.
6.Two optimization methods,Golden section and Fibonacci series,are employed to deal with this optimization model according to features of practical SAR(Synthetic Aperture Radar) systems. Efficiency of the contrast optimization algorithm is greatly improved compared with the quondam methods due to the application of the model and the two methods which are mentioned above.
结合实际SAR(Synthetic Aperture Radar)系统的特征采用了两种解决此优化问题的算法:黄金分割和Fibonacci级数法,和传统方法相比,这两种优化方法明显提高了对比度最优自聚焦算法的运算效率.
7.A new type of actuate mechanism for the active reflector of FAST(five-hundredmeter aperture spherical telescope) radio telescope was proposed so that one can overcome the deficiency of original actuate mechanism. The mechanism was utilized to prevent from the sideslip in the margin cell of the active reflector,and to promote the mechanical efficiency and reliability,and to reduce the cost of manufacture and operate.
针对现有的FAST(Five-hundred-meter Aperture Spherical Telescope)主动反射面调整运动机构和促动器试验方案的不足,提出一种新型机构,能够有效地解决反射面边缘单元侧滑问题,并提高整个系统机械效率、可靠性,降低制造成本和运行维护费用.
8.SAR (Synthetic Aperture Radar) ATR (Automatic Target Recognition) is crucial to the success of battlefield awareness and has become a very hot research topic.
基于合成孔径雷达（Synthetic Aperture Radar,简称SAR）的自动目标识别（Automatic Target Recognition,简称ATR）技术在战场感知方面非常重要，已成为国内外研究的热门课题。
9.A new OE-HOE system has been worked out,with which the large-aperture collimated waves,large-aperture convergent wa- ves,astigmatic waves,or wave beam with cross-section of any aperture shape can be produced.
本文给出一种光学元件(OE)与全息光学元件(HOE)的组合系统,利用它可以获得大口径高精度准直波、大口径会聚球面波和象散波以及各种形状截面的光波。
10.This paper derives the effective synthetic aperture length equation expressed as the initial position, the velocity and the synthetic aperture time when the radar operates in spotlight mode and the vehicle does uniform straight line motion, gives the ideal azimuth resolution equation expressed as the radar wavelength, the angles between velocity vector and line of sight from the antenna phase center to target at the begining and end time of synthetic aperture.
推导了雷达载体作匀速直线运动时，以载体初始位置、速度以及合成孔径时间表示的聚束照射SAR等效合成孔径长度的解析式； 给出了以雷达工作波长、合成孔径起始及终止时刻速度矢量与天线相位中心到目标瞄准线之间夹角表示的聚束照射SAR方位分辨率的理论表达式。
