一种提高光电跟踪设备捕获概率的搜索方法

大型光电跟踪设备跟踪测量精度高、惯量大、视场小,不具备大空域搜索目标能力,一般依靠雷达等设备提供的引导信息发现捕获目标,当目标引导误差超出光电设备视场后,光电跟踪设备难于发现目标。提出了一种在引导信息基础上的小空域快速螺旋搜索方法,通过系统建模仿真和外场试验验证,此方法适用于在目标引导信息误差超出视场情况下,快速搜索发现目标。在引导误差不超出两倍视场情况下,此方法可使捕获目标概率从20%左右提高到70%左右。此方法搜索过程中转台运动平稳,可根据不同光电设备系统性能、实际目标运动特征和引导误差灵活改变螺旋搜索参数,大大提高光电跟踪设备目标捕获概率,是大型光电跟踪设备小空域快速搜索发现目标的一种实用有效的方法,具有很高的通用性。     

用最小二乘法恢复逐行倒相副载波

介绍ＰＡＬ制彩色全电视信号中色同步信号编码原理及恢复逐行倒相副载波的过程中，两种计算色同步信号相位角的方法。并且在实验的基础上得出：最小二乘法在ＰＡＬ制电视信号的副载波相位角计算中不仅可以满足精度要求，而且简便灵活。     

基于子载波加权降低OFDM系统峰均功率比的方法

本文提出了一种通过对子载波数据进行加权来降低OFDM系统PAPR的方法.该方法实现简单,能有效降低OFDM系统的PAPR,且无需向接收端发送其它用于解调的信息.通过遗传算法求解每个OFDM符号的最优加权向量,在保证PAPR抑制效果的同时大大降低了加权系数的计算时间,并与投影拉格朗日法进行了比较.由于加权引起子载波功率的...     

A dynamic detection method to improve SLAM performance

Simultaneous localization and mapping (SLAM) technology is a research hotspot in the field of intelligent mobile robot, and many researchers have developed many classic systems in the past few decades. However, most of the existing SLAM methods assume that the environment of the robot is static, which results in the performance of the system being greatly reduced in the dynamic environment. To solve this problem, a new dynamic object detection method based on point cloud motion analysis is proposed and incorporated into ORB-SLAM2. First, the method is regarded as a preprocessing stage, detecting moving objects in the scene, and then removing the moving objects to enhance the performance of the SLAM system. Experiments performed on a public RGB-D dataset show that the motion cancellation method proposed in this paper can effectively improve the performance of ORB-SLAM2 in a highly dynamic environment.     

一种改进光探测器高速性能的新方法

研究了一种在光探测器的结构设计中加入平面螺旋电感从而提高光探测器高速性能的新方法。对影响探测器频率响应的因素进行分析,结果表明,增加电感值可以减小结电容对高速性能的限制,仿真结果也得到同样的结论。根据理论分析结果制作出探测器并进行测量,测量数据显示,未加电感的光探测器高速性能只能达到2GHz,而加电感的光探测器高速性能最大,可以达到5GHz,证明了电感值的增加可以明显提高器件的高速性能,得到了与理论分析一致的结果。     

一种提高量子线路保真度的映射方法

由噪声导致的双量子比特门操作错误是可逆的量子线路执行结果保真度下降的重要原因。提出一种将量子线路映射至含噪声量子计算设备的策略,提高量子线路在量子计算设备上的执行成功率。该策略给出一种寻找近邻路径方法,用于在量子比特不是全连通的量子计算设备上找出2个量子比特的近邻路径;由于在近邻路径上任意2个近邻量子比特的噪声一般不同,基于近邻路径上的双量子比特门执行成功率构建启发式函数,估算前瞻窗口内的线路保真度,并根据该代价函数选择保真度最高的近邻方式。通过测试多个Benchmarks,实验结果表明,与Qiskit工具包中SabreSwap和BasicSwap算法相比,本文所提策略的量子线路保真度平均提高65.67%和71.60%。该方法可以提高量子线路保真度。     

A method to improve the efficiency of CMP process

There are two important things when doing the CMP, one is the high removal rate, and the other is low nonuniformity. The factors, which may effect the result of polishing process, are pressure applied to wafer and the rotation speed of the wafer. In this study, the best polishing pressure distribution was studied. The effect of different boundary conditions between wafer and wafer carrier on the polishing pressure distribution was analyzed. The clearance between pad and wafer also analyzed     

A novel method to improve spatial resolution of acousto-optic deflector

In mobile atmosphere laser communication,the fastand accurate beamsteeringis one of the key techniquesfor acquisition,tracking and pointing(ATP) of laser sig-nals .Compared with the normal loop-locked trackingand pointing system composed of fast steering …     

A simple method to improve the transients in adaptive systems

A method, based on classical optimization techniques, is proposed to improve the adaptation transients in adaptive systems. Its philosophy consists basically in using a modified adaptation mechanism which alternately works in a priori mode, in which the optimization-correction horizon is slid forward in time, and in a posteriori mode, in which, by using an equivalent system, the parameters (and the adaptation gain matrix, if time varying) are recomputed over this horizon to generate the adaptive plant input.     

一种提高协作通信性能的新方法

传统的无线通信中,由于外部环境的干扰,信道的不稳定,网络的中断率比较高。在信道条件较差时,通信性能较差。本文利用无线通信节点间的合作,通过不同节点对信息的中继放大、解码（或者网络编码）,对直接传输的无线信道性能进行改进,大大提高了网络性能,降低网络的中断率;通过比较不同频谱效率下的不同转发方式的中断率性能,选择合适的传输方法。仿真实验得到：频谱效率小于一定值的情况下,利用放大和网络编码转发方式的性能大大高于直接传输方式。     

雷达通信一体化子载波和功率联合分配方法

雷达通信一体化系统是缓解无线电频谱拥塞和频谱资源短缺的高效解决方案。在雷达的最小信号噪声比和最小通信传输速率的约束条件下,通过构建混合整数非线性优化模型,提出了子载波和功率联合分配方法,实现系统总发射功率的最小化。首先将优化模型转化为线性模型并添加罚因子,然后选择用于雷达或通信目的的子载波。考虑到雷达性能和通信性能评价标准的差异,对用于雷达或通信目的子载波设置不同的发射功率约束,最终通过循环优化实现子载波和功率的联合分配。数值仿真结果表明,所提方法显著节约了功率资源。     

一种基于TLD的手势跟踪方法

针对手势跟踪的有效性和鲁棒性问题,提出了一种结合手势检测与TLD（Tracking Learning Detecting）跟踪的手势跟踪方法。首先利用Haar特征与Adaboost算法对静态手势进行快速检测,然后对手势区域进行定位,最后使用TLD算法对定位的手势区域进行跟踪以获取动态手势轨迹。实验结果表明,该方法可以实现对变形手势快速、准确的跟踪,对部分遮挡有很好的适应性,具有较高的鲁棒性和实时性。     

A template consensus method for visual tracking

Visual tracking is a challenging problem in computer vision. Recently, correlation filter-based trackers have shown to provide excellent tracking performance. Inspired by a sample consensus approach proposed for foreground detection, which classifies a given pixel as foreground or background based on its similarity to recently observed samples, we present a template consensus tracker based on the kernelized correlation filter (KCF). Instead of keeping only one target appearance model in the KCF, we make a feature pool to keep several target appearance models in our method and predict the new target position by searching for the location of the maximal value of the response maps. Both quantitative and qualitative evaluations are performed on the CVPR2013 tracking benchmark dataset. The results show that our proposed method improves the original KCF tracker by 8.17% in the success plot and 8.11% in the precision plot.     

一种实现图像跟踪的新方法

提出了一种用微机配普通视频采集卡在WinXP操作系统下结合使用DirectDraw和DirectShow编程实现图像跟踪的方法，为高速图像跟踪测量的实现提供了新的思路。     

A resolver-to-digital conversion method for fast tracking

A resolver-to-digital (R/D) conversion method in which a bang-bang type phase comparator is used for fast tracking is proposed. The low-pass filter needed to reject carrier signal and noise is eliminated from the R/D conversion loop. Instead, two prefilters outside the R/D conversion loop take the role of the low-pass filter, resulting in a fast and accurate tracking R/D converter. Some simulation and experimental results and a mathematical performance analysis are presented to demonstrate the superior tracking performance     

一种提高恶劣环境中电台话音质量的方法

针对恶劣环境中电台话音质量差这一难题,提出了一种有效的解决方法。首先在最小值控制的递归平均Ⅱ型（MCRA-2）算法基础上,提出了一种改进的MCRA-2算法。该算法采用自适应平滑参数和双检测门限,能有效减小音乐噪声,提高噪声估计准确性;然后将该噪声估计算法与对数最小均方误差估计器相结合,实现话音降噪,提高恶劣环境下电台话音质量;最后利用噪声估计结果和降噪后的话音信号,采用信噪比判决算法,自适应估计静噪门限,实现自适应静噪,进一步提高话音舒适度。实验表明,采用该方法的电台在大噪声、强干扰等恶劣环境中使用时,能明显改善话音质量,有效减轻收听者听觉疲劳。     

提高二次监视雷达解码有效性的方法

从某工程的实际背景出发,研究地面二次监视雷达询问机载航管应答机时出现解码错误的原因——多径影响,提出了一种提高地面二次监视雷达解码正确性的方法.通过对应答信号的全译码,动态调整译码幅度一致性参数的方法,仿真分析结果验证了该方法的可行性和有效性.     

一种改善成像光谱仪光谱检测能力的新方法

为了改善成像光谱仪的检测能力,在不改变硬件结构的情况下,采用光谱细化最优化的新方法,利用液晶可调谐滤光片式成像光谱仪,取得了入射光近似光谱数据,进行了理论分析和实验验证。结果表明,在3组数值仿真数据中,相较于成像光谱仪测量光谱,该方法得到的近似光谱与入射光真实光谱的光谱强度差的标准差分别减小了79.3%,68.3%和58.8%;在两组实验数据中,标准差分别减小了84.4%和60.7%;求解得到的近似光谱与入射光真实光谱的近似程度得到了显著提高,较好地分离了相隔较近的光谱峰。这一研究改善了成像光谱仪的光谱检测能力。     

一种通过高频增强曲线提高图像清晰度的方法

针对现有提高图像清晰度的技术中增强后的图像会放大噪声以及频率单调性无法保证与原图像一致的缺点,提出通过高频增强曲线来提高图像清晰度的方法。 首先通过提取其中高频分量,对图像的信号进行了分类,然后平滑掉噪声信号,应用高频增强曲线对高频分量进行提升,保持了高频分量的单调性。实验仿真结果表明该方法可以消除噪声,细节和小边缘能够得到增强,大边缘却没有过增强。有效地提高了图像的清晰度。     

A synthesized method to improve coherence in semiconductor lasersby electrical feedback

A method for improving coherence in semiconductor lasers by negative electrical feedback is proposed for stabilization of the center frequency of the field spectrum, linewidth reduction of the field spectrum, frequency tracking to another highly coherent laser, and stable and wideband frequency sweep. Experimental center frequency stabilization of the master laser showed that the magnitude of frequency fluctuations was reduced to 50 kHz at the integration time τ=3 s. The linewidth of the master laser was reduced to 100 kHz, which was 1/50 that of the free running laser. Under these frequency control conditions, the frequency of the slave laser was controlled so that the phase of the heterodyne signal between the master and the slave lasers could be locked to that of a stable microwave synthesizer. The slave laser frequency tracked accurately to the master laser frequency