基于高效信道化的侦察接收机设计与实现

为了解决电子侦察接收机中同时到达信号的接收问题,从传统的低通滤波器结构出发,给出了一种无盲区高效数字信道化接收模型。信道化之后进行瞬时幅度和相位差提取。通过系统仿真,验证了该信道化模型的正确性;通过搭建信道化接收机的硬件平台并对实际系统测试,验证了瞬时幅度及相位差测试的正确性。     

自动化软件平台发展趋势

<正>1工业化与信息化背景1.1工业化与信息化的融合工业化是驱动经济社会发展的重要动力,而信息化已经渗透到生产管理、经济生活的各个角落,信息化与工业化的融合代表了未来经济发展的方向,是占领后危     

基于扫频RCS测量的便携式吸波涂料测量仪

介绍了一种测试吸波涂料反射率的便携式测量设备,该设备基于扫频RCS测量原理实现。与传统方法相比,本设备具备简单、测试灵活的优点;与其他的便携式设备相比,本设备精度更高、性能更稳定。     

基于BF561的智能视频监控仪的设计

介绍了一种基于BF561的智能视频监控器的设计和实现。给出了系统的总体结构、系统各部分的硬件组成以及系统的主要算法和软件实现。测试结果表明,本设计具有良好的实时性、稳定性和准确性,可用于视频监控业务。     

Effects of environmental temperature and humidity on thermal flying height adjustment

Thermal actuated sliders are being widely used in today’s hard disk drive industry for its advantages of easier control of flying height (FH) and less risk of contacts with the disk. This article uses a coupled-field analysis method, which includes an air bearing model, a heat transfer model and a thermal-structural finite element model to investigate the FH changes of thermal actuated sliders at various environmental conditions. The mechanism of water vapour’s contribution to air bearing pressure loss is explained and a new humidity model is proposed to calculate this pressure loss. The temperature effects are also considered in the simulation models. It is observed that the environmental temperature and humidity have significant effects on slider’s FH changes, but their effects on the thermal protrusion height are limited. A humidity sensitivity study is also made and the results are discussed. It is found that the slider with thermal protrusion on its trailing pad will be more sensitive to the humidity. Besides air bearing stiffness, some other factors such as peak pressure, protrusion shape and air bearing surface (ABS) design will also contribute to the slider’s humidity sensitivity.     

Contact recording review

Various contact recording technologies for hard disk drives are reviewed. The advantages and disadvantages of each approach to contact recording are analyzed. Experimental detection methods and simulation models for the contact force are introduced. Some important technologies related to contact recording are addressed. The effects of lubricant and the short range forces on contact recording are discussed, and the dynamic flying characteristics of a slider with spherical pad at trailing edge are studied. It is suggested that a thermal protrusion slider with a spherical pad at the trailing edge may be a possible approach for the success of contact recording.     

Feedback-free rate-allocation scheme for transform domain Wyner–Ziv video coding

In most existing Wyner–Ziv video coding schemes, a feedback channel (FC) is expected at the decoder in order to allocate a proper bit rate for each Wyner–Ziv frame. However, FC not only results in additional latency but also increases decoding complexity due to the several feedback-decoding iterations. Moreover, FC may be unavailable in many practical video applications. In this paper, we propose a novel feedback-free rate-allocation scheme for transform domain Wyner–Ziv video coding (TD-WZVC), which predicts the rate for each Wyner–Ziv frame at the encoder without significantly increasing the complexity of the encoder. First, a correlation estimation model is presented to characterize the relationship between the source frame and the reference frame estimated at the encoder in TD-WZVC. Then, an efficient FC-free rate-allocation algorithm is proposed and a linear model is built to avoid both overestimation and underestimation of the real rate and obtain an optimal rate-distortion performance. Experimental results show that the proposed scheme is able to achieve a good encoder rate allocation while still maintaining consistent coding efficiency.     

Intelligent integrated data processing model for oceanic warning system

There are a number of dirty data in observation data set derived from ocean observing network. These data should be carefully and reasonably processed before they are used for forecasting or analysis in oceanic warning system (OWS). Due to high-dimensional and dynamic oceanic data, we propose an intelligent integrated data processing model for the OWS. Firstly, we design an integrated framework of the oceanic data processing and present its processing model. The function of each module of this model is analyzed in details. Then, we propose several intelligent data processing methods, such as an intelligent data cleaning method based on the fuzzy c-means algorithm, a data filtering and clustering method based on the greedy clustering algorithm, and a data processing method based on the maximum entropy for the OWS. The efficiency and accuracy of the proposed model is proved by experimental results of observation data of the Red Tide. The proposed model can automatically find the new clustering center with the updated sample data, and outperforms several algorithms in data processing for the OWS.     

基于链路故障的MANET本地修复技术

针对已有移动自组网本地修复技术的不足,以AODV路由协议的本地修复技术为基础,考虑网络节点状态的变化,提出一种基于链路故障的本地修复技术,对链路故障进行分类,对不同类型的故障采取不同的修复方法。仿真结果表明,改进的本地修复技术可以有效减少路由建立时间并控制分组开销,提高了网络性能。     

基于FitNesse的验收测试驱动开发

软件开发过程需要开发团队与用户间交流、协作,FitNesse是一个基于集成测试框架(FIT)的测试环境,是用于增强交流和协作的工具.借鉴极限编程思想,针对当前软件开发过程存在的缺陷(缺乏与用户间的交流和协作机制),介绍一种解决方案:基于FitNesse的验收测试驱动开发(ATDD)技术.应用该技术有助于用户、需求工程师、开发人员及测试人员间的协同工作,从而大大提高用户满意度并改善软件开发效率.