红外经纬仪视频图像判读系统研究

红外经纬仪在海上靶场测控中有重要作用,对红外视频图像的判读直接影响红外经纬仪的测角精度。通过对红外视频图像的判读原理和方法的介绍,针对靶场红外图像的特点,提出一种中轴线判读方法,以及基于最大类间方差法的高阈值图像二值化算法,提高了视频判读的稳定性和准确性。在此基础上研制了一套红外视频图像判读系统,试验结果和误差分析表明了所提方法的有效性。     

利用GPS实现靶场非定点弹道外测的方法研究

本文提出了一种新的利用光电经纬仪进行靶场弹道外测的理论。随着我国导弹性能的不断提高,其飞行距离越来越远,并出现了多航向、多落点、多变航道的特点,面对这些新的飞行特性的弹道测量,将光电经纬仪安置在经事前大地测量后位置参数已知的固定站点上进行跟踪交汇测量的传统测量方法使得设备使用上不够灵活机动,针对这一问题,本文提出了利用GPS技术实现靶场光电经纬仪非固定点弹道外测的方法。文中论述了非固定点测量所面对的两个问题,针对性地提出了利用GPS实现光电经纬仪自主定位的方法和解决非固定点测量时测点方位基准不易统一的方法,最后通过交会解算方程的推导过程来验证本方法的可行的。     

光电跟踪仪伺服系统的工程设计

介绍光电跟踪仪伺服系统的工程设计，在设计中采用计算机模糊滑模变结构和位置环、速度环和电流环三环控制技术，提高了系统的控制精度。     

光电经纬仪调焦行差对测角总误差影响的分析

基于光电经纬仪靶场校飞试验测角总误差的误差修正中,其调焦行差对光电经纬仪的测角总误差的影响,以GW-1208光电经纬仪为例,讨论了其光学系统中存在的调焦行差,并定量分析了调焦行差对光电经纬仪方位和高低测量数据的影响,通过对靶场校飞试验数据的分析,在测量数据处理中对光电经纬仪的调焦行差进行了修正.结果表明,修正后测角总误...     

光电跟踪仪的显控台

显控台是光电跟踪仪的计算中心、控制中心、指令中心和显示中心.它主要由计算机、电视监视器等组成,其主要功能是计算处理、显示和遥控.     

光电跟踪仪的自主捕获技术研究

文章以火控系统中的光电跟踪仪为研究对象,重点分析研究了光电跟踪仪在二坐标搜索雷达的引导下,采用一维扫描方式,自主捕获目标的战术需求、面临的主要技术难题等,并提出了解决的方法。从试验结果来看,采用所述的方法对空中目标的自主捕获是完全可行的,对于实现光电跟踪仪的二维扫描自主捕获目标也具有一定的参考意义。     

一种降低光纤通信系统误码率的方法

针对光纤通信系统在传输过程中易受光纤线路、传输设备等因素干扰的问题,提出了一种利用基于卷积神经网络的编码器-解码器来降低接收端信号误码率的方法,从而提升光纤通信系统的抗干扰能力。具体地,利用伪随机二进制序列(Pseudo-Random Binary Sequence)码作为标签信号,将受干扰后的信号作为输入信号,训练出具有恢复受扰信号能力的卷积编码器-解码器。实验结果表明,卷积编码器-解码器能降低受一定程度干扰的信号误码率,具备提升光纤通信系统抗干扰性能的能力。     

干涉条纹自动判读方法的研究

提出了一种全新的干涉条纹自动判读算法。该算法利图像自身的灰度信息构建合适的权函数，进而确定条纹对应的曲线，使得条纹上各点到该曲线距离的平方的加权积分最小。该算法不仅可以提取条纹的多样化信息，而且同时还具有图像处理的功能；当权函数是图像灰度的奇函数时，该算法对图像的随机噪声不敏感。     

TDD-LTE系统Turbo速率匹配算法及FPGA实现*

速率匹配是基带信号处理的重要组成部分.基于TD-LTE射频一致性测试系统,设计了一种可用FPGA实现的快速实现方案,该设计方案实现了Turbo速率匹配,并应用于射频一致性测试仪表的开发中.该方案有效地减小了Turbo编码速率匹配的处理延时.     

分析装表接电过程中错误接线的成因及其危害

本文从装表接电过程中错误接线的具体表现入手,详细分析了装表接电过程中错误接线的成因及其危害,切实保证用电安全,实现装表接电的科学合理。     

微机防误装置在变电站的应用

介绍UT－2000型微机防误装置的组成，原理及在应用中应注意的问题。     

利用EXIT图分析信源码率对双LDPC码系统的影响

双LDPC( DLDPC)码系统是一种高性能的信源信道联合编码系统,但是其性能在很大程度上受到信源码率的影响。为了从理论上分析信源码率对DLDPC码系统的影响,推导了外信息转移( EX-IT)函数,并利用EXIT图分析了信源码率对DLDPC码系统的影响,理论分析结果与实际仿真结果一致。进而利用EXIT图估算出DLDPC码系统在不同信源熵情况下的信源码率门限值,该门限值可以用来指导实际系统中信源码率的选取。所提出的分析方法比传统的蒙特卡罗仿真法更加简捷、直观。     

代码审计系统的误报率成因和优化

目前,代码审计已经成为网络安全建设中举足轻重的环节,基于自动化源代码检测的代码审计系统已经得到了广泛的应用,但仍存在诸多缺点。总结了当前代码审计系统的不足之处,简述了不同静态源代码检测算法的原理,并分析检测报告中出现误报的原因,提出了相应的优化思路,描述了优化方案的技术原理及其应用场景。     

DECODING BEYOND THE BOUND OF THE COMPLEX-ROTARY CODE AND ITS DUAL CODE

The capabilities of decoding beyond the bound of the Complex-Rotary code (CRcodes) and its dual code are analyzed. It is obtained that the CR codes with normal error-correcting ability t = (p+1)/2 can correct (t+1)-errors up to C_(p~2+p(p+1))~(t+1)-p~(2Ct)_(2t+1) and itsdual code can correct (t_1+1)-errors up to C_(p~2+2tp)~(t_1+1)-2tpC_(p+1)~(t_1+1) where t_1=(p+1)/2-1 and pis a prime.     

Optimization and realization of SWIPT relay channel transmission rate based on rateless code

The optimization of the transmission rate and implementation of the simultaneous wireless information and power transfer in a relay system were studied.In a three-node two-hop system,the decode-and-forward protocol was employed by the relay node.One transmission period was divided into two phases.The first phase was the simultaneous transmission of the information and energy from the source to the relay.The received signal at the relay node was split to two parts.One part was used for information decoding,and the other was converted into energy for information forwarding in the second phase.In the second phase,the information was forwarded according to the decode-and-forward protocol by the relay.The power splitting factor was optimized to minimize the total time of the two hops for the transmission of a certain amount of information when the durations of the two hops were unequal.Furthermore,Raptor codes were combined with different modulation modes to realize different transmission rates on the two hops for the efficient utilization of the different channel capacities in the two hops.The selection mechanism of the codeword length of Raptor codes and modulation mode was given.The simulation proves that the two hops with unequal durations can achieve a higher throughput,and the capacity of the relay channel can be efficiently used by employing Raptor codes,and an efficient and reliable transmission is realized.     

Choosing a wrong mobile communication price plan: An empirical analysis of predictors of the degree of tariff misfit among flat rate subscribers in Germany

Worldwide, more and more users of mobile communication services (MCS) are in tariffs which decouple the level of customer usage of one or several MCS (voice calls, Internet access, SMS) from the fixed monthly charge of mobile network operators (MNOs). However, consumers may inappropriately subscribe to such a flat rate because other usage-dependent price schemes are available which more closely match with their MCS use patterns. Surprisingly, little research has examined how the degree of consumer tariff misfit is correlated with socio-demographic, contract-, MCS-usage- and device-related subscriber characteristics. The present paper analyzes such associations. We develop two volume-based measures of the degree of tariff misfit in a sample of 1,274 subscribers of an MNO in Germany who had switched into a “grand flat rate” which includes unlimited national call minutes, mobile Internet traffic as well as national SMS. We find that the degree of tariff misfit is significantly higher among subscribers who are older, live in West Germany, have a longer MNO tenure, have larger monthly usage volume variations of voice calls, mobile Internet and SMS and are equipped with a device which is not an Apple iPhone. Implications of the results are discussed for MNO practitioners and for future scholarly work.     

基于平衡Gold码的TH-UWB系统性能分析

针对有码间干扰的跳时脉冲脉位调制超宽带(PPM-TH-UWB)通信系统,为了在不增加系统复杂度的前提下,提高系统抗码间干扰的性能,研究了基于平衡Gold码的Rake接收机的性能,并在IEEE 15.3a UWB信道下对采用平衡Gold码作为跳时序列的Rake接收机和采用传统伪随机序列的Rake接收机的误比特率进行计算机仿真比较,结果表明:采用平衡Gold码作为跳时序列,Rake接收机得到明显改善,而且码间干扰越严重,性能提升越显著。     

物联网编码解析系统的体系结构和算法研究

在编码解析需求的基础上,首先,提出了一个应用在大规模动态场景下的物联网编码解析系统的体系结构,它由多个相互独立且协作的编码解析服务组成。然后,提出了一个基于改进的SkipNet的编码解析服务,它不但继承了传统DHT覆盖网络的优点,还支持区域自治。最后,通过仿真实验表明,该服务具有优良的性能。