Results 21 to 30 of about 1,407 (156)
On the Construction of Communication Base Station from the Perspective of Public Goods -A Case Study of Zhangzhou City [PDF]
, 2016 近年来，公用移动通信快速发展，并有不断提速的迹象。来自4G-Reports提供的报告，4G网络正在变得越来越流行；数据显示，4G用户数目不仅已经突破了10亿，而且4G网络的数量也在增长，根据2016年第四季度的报告GlobalLTEPricingTariffTracker，4G用户总数已经达到了10.5亿，其中中国、美国和日本的用户占到近2/3。国内，随着2013年12月4日，工业和信息化部向三家通信运营商颁发4G牌照（TD-LTE ...
石宇斌
core
Integrated Transmission Resource Management Scheme for Multifunctional Radars in Dynamic Electromagnetic Environments [PDF]
Traditional multifunctional radar systems optimize transmission resources solely based on target characteristics. However, this approach poses challenges in dynamic electromagnetic environments owing to the intelligent time-varying nature of jamming and ...
Chang GAO +4 more
core +1 more source
Rare Metals, EarlyView.ABSTRACT The development of high‐performance electromagnetic protection materials integrating broadband absorption and effective shielding capabilities is hindered by challenges in simultaneously optimizing multiple electromagnetic properties through conventional material designs.
Changlong Du +9 more
wiley +1 more source
Study on Millimeter-Wave Collision Avoidance Radar Based On Digital Beamforming [PDF]
, 2016 近年来，随着交通情况的日益复杂及人们对安全性的要求越来越高，防撞雷达的研究也进入一个快速发展的时期，不断涌现出新的方法和理论。防撞雷达常见的探测方式有超声波、激光等方式。这些方式存在穿透能力较差、作用距离近等缺点，实际工作效果并不是很好。毫米波方式波长短、抗干扰能力强，在雨雪天气下工作良好，且硬件设备具有体积小、重量轻的特点。另外，由于线性调频连续波雷达具有距离分辨率高、结构简单、无距离盲区等优点，因此，基于线性调频连续波方式的毫米波雷达在防撞雷达中得到广泛采用。 目前 ...
庄景波
core
Rare Metals, EarlyView.ABSTRACT Fluxgate sensors with Co‐rich amorphous microwires, widely used for their low noise in magnetic field measurements, encounter significant challenges in high‐temperature environments such as well drilling and geological exploration. Prolonged thermal aging degrades the performance of Co‐rich amorphous microwires, resulting in increased noise ...
Lining Pan +10 more
wiley +1 more source
Direction Finding Based on Closely Spaced Dipole Array Antenna [PDF]
, 2016 电小间距阵列测向研究是无源定位的一个重要研究方向，同时也是阵列信号处理领域的一个重要分支。一般来说，电小间距阵列天线（间距≪λ）的特点是单元之间的耦合强烈，单元增益小，单元之间的相位差变化缓慢，阵列的测向性能差。电小间距天线测向的一个研究重点就是耦合对测向性能的影响，以及通过改善耦合，来改善电小间距阵列天线的测向性能。 本文研究了耦合对电小间距偶极子阵列天线的影响。研究表明，耦合的引入，不仅可以进一步改善偶极子单元天线的方向性，还能显著提高天线单元的之间相位差的变化 ...
姚志会
core
Intelligent interference decision algorithm with prior knowledge embedded LSTM-PPO model [PDF]
Focusing on the issues of low efficiency and effectiveness in decision-making as well as the instability of traditional reinforcement learning model-based multi-function radar (MFR) jamming decision algorithms, a prior knowledge embedded long short-term ...
LI Chao +3 more
core +1 more source
Rare Metals, EarlyView.ABSTRACT Regulating negative parameters of metacomposites is mainly limited by their unclear mechanisms, which affects their practical applications in new sensing, communication, electromagnetic (EM) protection and other fields. This work proposes a dual‐functional competitive design strategy based on the waste corncob‐derived carbon/polyaniline ...
Qiuyun Yang +4 more
wiley +1 more source
Radio signal recognition based on image deep learning [PDF]
, 2019 A technical idea was innovatively proposed that uses image deep learning to solve the problem of radio signal recognition.First,the radio signal was transformed into a two-dimensional picture,and the radio signal recognition problem was transformed into ...
Changwen ZHENG, Xiaoxin HE, Xin ZHOU
core +1 more source
Rare Metals, EarlyView.ABSTRACT Considering the multiple challenges faced by stealth coatings in complex service environments, the development of multifunctional integrated microwave absorbing materials (MAMs) that combine efficient electromagnetic (EM) attenuation with environmental tolerance has become an urgent need. In this work, coral‐like CoNi@Void@C microparticle (MP)
Jiale Wu +8 more
wiley +1 more source