Abstract:High frequency(HF) communications play an important role in the field of their communications because of their skywave propagation characteristics.In this paper,two advanced HF radios are selected to introduce the current status for HF communications.Afte

Abstract:For the delay-control system consisted of multi-delay circuit,the delay precision is related to delay circuit reliability,expected delay time,probability density function of delay time,output finesse and so on.To get maximal action probability within the

Abstract:A competition model is developed using the antinomy-unification principle in the growth of natural trees.Contrasting to the fractal graphics,the growing process of the competition model is controlled and adjusted according to the living environment which

Abstract:The basic features of indoor powerline channel are presented in this paper,as well as relevant model.Based on the model,this paper also proposes an adaptive Orthogonal Frequency-Division Multiplexing(OFDM) algorithm which minimizes total transmission powe

Abstract:A real-time target detection system is designed for the multiple targets detection in large field and deep sky.The system implements the target detection of high frame rate and large field,taking TMS320C6203 as its main processor and Field Programmable Ga

Abstract:In this paper,the design and implementation of the test system for characteristic parameters of helicopter power is introduced.Different algorithms for testing the characteristic parameters of helicopter power in the field is designed by LabWindows/CVI6.0

Abstract:A new type of CTS(Coaxial Transverse Stub) antenna array-Coaxial Continuous Transverse Conical Stub(CCTCS) antenna array is presented in this paper.This type of antenna,which is based on the conical linear coaxial structure,is constructed by several serie

Abstract:针对当前第三代通信技术对微波放大器的线性度的要求,分析了微波放大器的非线性失真特性,介绍了几种提高线性化特性的技术方案,并比较了各自的优缺点。最后,基于功率回退技术研制了一个W-CDMA(Wide-Code Division Multiple Access)线性功率放大器,并给出了实验测试结果。

Abstract:In order to design a bondwire interconnect in Microwave Multi-Chip Module(MMCM),the 3D electromagnetic analysis software HFSS and circuit design software Ansoft Designer are introduced into the simulation analysis of bondwire models.Based on the simulatio

Abstract:TEM Cells(Transverse Electromagnetic Cell) with high cut-off frequency and homogeneous distribution of electromagnetic field are required in microwave-chemistry experiments.A novel TEM Cell which is used in microwave chemistry experiments is designed.The

Abstract:A new type of high efficiency and high-power overmoded Surface-wave Oscillator(SWO) is designed.This oscillator contains a part of drift tube like Multiwave Cerenkov Generator(MWCG).The special framework of the Slow Wave Structure(SWS) can support surface

Abstract:Accurate measurement of complex permittivity of electrolyte solution is essential for both bioelectromagnetism and microwave chemistry.An easy and valid measurement method is using an open-ended coaxial line.When the coaxial line probe is inserted into th

Abstract:The paper proposes a new scheme of digital image watermarking based on the combination of DWT and SVD.The original image is decomposed with DWT into several subbands,and SVD is applied to transform the subbands.The gray-level watermark image is decomposed

Abstract:现代可分级视频编码的时域可分级性是采用运动补偿时域滤波技术(Motion-Compensated Temporal Filtering,MCTF)来实现的,MCTF将若干连续的视频帧组成一个图像组进行小波分解以提供时域可分级性。由于不同视频序列的时域特征变化,传统的图像组大小固定的时域分解影响编码效率。本文提出了一种图像组大小自适应调整的时域小波分解算法,利用帧间预测效果来决定视频序列的时域特性,根据时域特性用于小波分解的图像组大小做自适应的调整。实验结果表明,新算法的编码性能比图像组大小固定的结构大大提

Abstract:It is required to generate multi-mode modulated signals for a telemetry system.An application program for ICS-564A DAC is developed,which works at continuous and quadrature modulation mode to calculate baseband I,Q data,and setup modulation parameters.The

Abstract:提出一种隐藏方法以提高在二值图像(如传真、图章等)中数据的隐藏能力。该方法首先将原始图像分块,然后生成与图像块大小相同的二值随机矩阵和权矩阵,最后经过异或、求和等运算实现数据隐藏。该方法隐藏的信息量大,修改的数据量小,有较好的防篡改和防攻击性。经仿真实验验证,它能隐藏较多的数据且同时保持较高的隐密图像质量,具有一定的应用前景。

Abstract:Direct Digital Synthesis(DDS)chip has many working models.It is a good choice for some electronic equipments which reqire complex signals.Based on the chip of AD9854,the paper develops a technology which utilizes CPLD device to generate specific signal wa

Abstract:A miniature microwave low pass filter using a microstrip stepped impedance hairpin resonator is proposed.The proposed filter only consists of a stepped impedance hairpin resonator using simple micro-strip line section.As a result,the filter has a 3dB pass