改善局部相参雷达动显能力的一种有效途径

本文分析了局部相参性的产生机理，推导出量度局部相参的数学表达工，探讨了影响部相参性的各种因素，并针对影响局部相参性的主要因素，提出了一处相位和频率记忆环，改善局部相参性的技术途径，可使局部相参雷达具有准相参数的性能。可明显地提高局部相参雷达的动显能力。     

单通道相参测控体制下多站触发对测距性能的影响

针对某航天发射任务中船载统一S频段(USB)测距数据出现两次异常跳变的问题,提出了侧音测距原理分析、频谱分析和试验验证相结合的分析排查方法,有效解决了该问题,可为今后其它设备排查类似问题提供一定的借鉴.     

多路相参转发的集成设计方法

针对航天领域多路相参转发应答机的小型化、通用化需求,提出了一种集成设计方法。根据软件无线电思想,在本振合并、频率修正的基础上,采用数字中频拓展、通道共用的方法,扩展了数字处理电路的覆盖频段,用数字电路取代了传统中频通道中通过低次倍频本振实现的上、下变频,从而统一了晶振、本振,简化了频率流程。方法得到了相应产品的试验验证,首次实现仅用一个本振、一次变频,完成C频段以上多路相参转发的功能,且便于芯片集成和通道拓展,可作为类似收发信机的通用架构推广应用。     

全固态数字化脉冲相参应答机的设计

详细论述了全固态数字化脉冲相参应答机的功能、设计思路和设计原理,给出了各 功能模块的设计方法,对脉冲应答机的动态平衡、时延补偿、固态功率输出及多脉冲屏蔽等 关键技术提出了解决方法。该数字脉冲相参应答机已经在靶场外测系统中得到广泛应用。     

带温漂补偿的小型化毫米波单脉冲雷达接收前端

介绍一种用于非相参雷达导引头的毫米波接收前端小型化低温漂设计技术。采用多芯片混合集成电路和镜频抑制混频器技术,设计了一种小型化三通道高放混频接收前端。针对非相参雷达特点,对接收机本振采用频率漂移的温度补偿技术,保证了全温范围内接收机对信号频率的稳定跟踪。测试结果表明,接收前端噪声系数低于4.0 dB,镜频抑制大于25 dB,全温范围内温度漂移小于0.6 MHz/℃。     

基于模型外推的异源雷达相参配准

异源雷达带宽相参合成技术的关键和难点之一是相参配准,而对固定相位差异的估计精度较低,通常需采用各种优化算法提高估计精度,但计算量较大。在建立异源雷达回波模型后,分析了两种相位差异对衰减指数和（DE）模型的影响,用数据相关方法估计线性相位差异,并提出一种基于模型外推的固定相位差异补偿方法,将补偿固定相位差异与模型外推合为一步,简单有效,计算量小,不存在残余量,且该外推方法与传统外推方法相比误差基本没有增加。仿真结果表明,在14 dB信噪比下算法取得了令人满意的效果。     

浅析相噪混叠对调频步进雷达信号的影响

结合频率稳定度理论,文章基于调频步进雷达系统的信号模型,分析得出频率源相位噪声在信号图像处理过程中发生混叠的结论．并讨论其对雷达信号性能的影响。     

经济周期协动性对中国经济的影响

经济的周期性波动是世界各国或地区经济发展过程中不可避免的现象,它能够有效地反映一个国家的经济实力以及世界经济整体的发展状态和信息。目前我国的经济飞速的发展,经济周期协动性对我国的影响越来越大。因此,针对经济周期协动性对我国的经济的影响,通过对其传导机制的影响,提出了具有针对性的措施,为我国今后处理经济周期协动性提供了支持和借鉴。     

产业内贸易对东亚经济周期协动性影响的实证研究

本文从理论上分析了产业内贸易对东亚经济周期协动性的影响,基于1990-2009年的数据,首先分析了中国与东亚各国产业内贸易指数的动态变化;其次,运用HP滤波方法提取周期因子ct,验证了东亚经济周期的协动性。在此基础上,构建了以贸易强度和产业内贸易为自变量,经济周期协动性为因变量的回归模型,运用分期数据对产业内贸易与经济周期协动性进行了面板数据的固定效应回归分析。研究结果揭示:相较于贸易强度,产业内贸易对中国与东亚经济周期协动性的影响更直接更显著,产业内贸易是中国与东亚经济周期协动性的主要传导渠道。随着产业内贸易比重的提高,中国与东亚贸易伙伴经济周期的协动性趋强。     

The effect of local food consumption of domestic tourists on sustainable tourism

This research aims to determine the effect of local food consumption of domestic tourists on sustainable tourism. In addition, the study also aims to: reveal the impact of local foods on economic, socio-cultural, and environmental sustainability. In this context, data were collected from 394 domestic tourists visiting the provinces of the Eastern Black Sea region (Artvin, Bayburt, Gumushane, Trabzon and Rize). This research was designed in accordance with the correlational research method, one of the quantitative research designs. The research data were tested using structural equation modeling, which is commonly used in the social and behavioral sciences. As a result, it was found that local food has a statistically significant and positive effect on sustainable tourism. In addition, local food was found to have a positive effect on the subscales (economic, socio-cultural and environmental) of sustainable tourism.     

I/Q正交双通道幅相不平衡对MTI性能的影响及改善

本文分析了接收机幅相不平衡对信号处理的信杂比改善因子的影响，介绍了一种抑制镜像信号的DPD技术。     

连续波相干应答机的测速定位误差

在高精度的连续波跟踪测量系统中,应答机是其测速定位信号传输通道的重要部分。本文分析了系统本振及应答机中采用的非相干本振的相位噪声所引起的测量误差,推导了测速定位误差的数学表达式。分析表明,非相干本振会使测量产生较大的误差。     

基于AWG/RTSA的PD雷达信号模拟和相参分析方法

针对脉冲多普勒(PD)雷达的回波特点和相参特点,分析了回波模拟的难点。在其传统回 波模拟和相参分析方法基础上,结合现代电子测量仪器在任意波形产生和实时频谱技术的应 用,提出了一种基于现代任意波信号发生器的PD雷达回波模拟方法和基于现代实时频谱分析 仪的相参分析方法。经过实验验证,该方法可有效提高PD雷达的调试效率。     

The impact of consumer local engagement on local store patronage and customer satisfaction

Abstract

This paper examines the drivers of local grocery retail patronage. Drawing on institutional and social network theory literature, we develop a framework to investigate how consumers’ personal values and engagement with local communities affect their satisfaction and local store patronage. We test our model with survey data on 1504 Finnish consumers. Our results show that the relationship between customer local engagement and local retail patronage is indirect rather than direct, and it is mediated by the vitality of local services, social interaction, and consumer satisfaction.     

采用调相法测量高炉装料高度分布状态的调频雷达

本文介绍一种减少常规FM-CW(调频-连续波)雷达固定误差的新方法——双频混频调制法.这种方法只要求窄频带,所以雷达结构简单而且小型化.文章分析了调频雷达的误差,叙述了双频混频调制的基本原理,以及这种新型雷达的实际应用例子.     

Drivers of local merchant loyalty: Understanding the influence of gender and shopping motives

The aim of this research is to gain a deeper understanding of local merchant loyalty. Gender theories and shopping motivation literature were used to hypothesize drivers of consumer local merchant loyalty. Survey data from a nationwide random sample of consumers was employed to test the hypotheses. Results indicate gender significantly influences shopping motives and shopping motivation differences influence local merchant loyalty. Academic and managerial implications are discussed.     

Locally-owned convenience stores and the local economy

The convenience store sector in the UK has been growing strongly in recent years. Anecdotal commentary and media coverage claims that locally-owned stores are more advantageous for community coherence and resilience, being embedded socially and economically more strongly (than chain stores) in their local community. This paper extends our understanding of this. Following a review of the literature on social and economic aspects of convenience store operation, a multi-stage mainly qualitative research process was undertaken. Using four case stores in Scotland, this research demonstrates the local engagement of locally owned convenience stores and points to a stronger awareness and detail of the economic rather than the social aspects of this engagement. Differences with corporately owned convenience stores are identified. In policy terms the research shows that more work needs to be done to identify, quantify and then promote the advantages of local ownership of stores.     

基于SHARC的多功能雷达模拟器的设计与实现

ADSP21060是AD公司生产的一种高性能的32位浮点DSP芯片，在雷达模拟系统实时性要求高时，可基于ADSP21060来实现雷达模拟器。本文介绍了ADSP21060的性能，给出了雷达模拟器系统实现的系统原理图和硬件框图及软件流程。该雷达模拟器采用PC机和DSP组合的结构，用软硬件相结合的方法，ADSP21060完成实时运算，最终产生满足要求的视频信号。