sky-wave path loss

Aim at the lower height transmission environment by using the ultra wide band wireless signal in the communication link of micro air vehicle,analyse the probable existing landform and area in the propagation channel,and its impact on the pathloss of UWB signal.

针对将超宽带无线信号应用于超小型无人机通信链路的低空传输环境,分析了信号传播可能遇到的各种地形、地物等因素对传输损耗的影响,选择修正的S-V多径信道模型,对选定的两个信号传播环境进行了仿真,并给出了信道的路径损耗、冲激响应、rm s时延扩展、平均超量时延、多径分量数目和功率延迟剖面,仿真结果表明该模型能够有效反映信道的特性参数,可为超宽带接收机的设计提供参考。

The field strength of reflection and diffraction rays is calculated in the local ray fixed coordinate systems to obtain the total field and pathloss of signals site.

反射线和绕射线的场强在本地射线基坐标系下计算，得出接收点处信号的总场强和路径损耗。

To explore and simulate the impact of multipath fading,pathloss,and shadowing fading on wireless networks,mathematical and simulation models for fading and shadowing are proposed,a method to calculate the shadowing effect is designed,and the utilization of the pathloss exponent is optimized.

为了考察多径衰落、路径损耗和阴影衰落效应对无线网络性能的影响并对其进行准确模拟,建立了多径衰落和阴影衰落的数学和仿真模型,设计了阴影衰落效应的计算方法,优化了路径损耗指数的使用。

Modeling of propagation path loss in a canopy;

树冠中电波传播路径损耗的研究及模型的建立

Measuring of Mobile Communications Electromagnetic Wave Propagation Path Loss;

移动通信电波路径损耗的测试

With the platform, the wireless signals characteristics of the tactical communication were analyzed, such as the propagation paths, receiver power and path loss.

针对这些因素,在建立不规则地形环境模型、战术通信设备模型的基础上,构建了复杂环境下的战术通信信道仿真平台,研究和探讨了战术无线通信信号在此环境中的传播路径、接收功率和路径损耗等特性,并给出了仿真分析结果。

Thus, the path-loss is determined as the condition of topology construction, and a path-loss based distributed topology control algorithm (PLBD) is designed.

考虑接收信号强度作为拓扑构建条件时需节点具备相同发射功率的不足,提出将路径损耗大小作为拓扑构建的条件,设计了一种分布式拓扑控制算法——PLBD。

The modulation of UWB and MA technologies is discussed,and then the path loss model and multipath channel model of UWB proposed by IEEE802.

SG3 a建议使用的UWB路径损耗模型及多径信道模型进行了深入的分析。

Based on a simple analysis of the characteristic of TACAN signal,the interference of UWB signal to TACAN receiver is discussed from the aspect of average power by using the UWB path loss models,which may offer reference to further study.

在对战术空中导航系统(Tactical Air Navigation,TACAN)的信号特征进行分析的基础上,结合UWB路径损耗模型,从平均功率的角度讨论了脉冲UWB信号对TACAN系统的干扰情况,为进一步的研究提供了借鉴与参考。

Computing Of Pass Loss Base On Field Diffuse

基于场量扩散的电波传播路径损耗计算

Research on electromagnetic wave propagation models of the path loss in wireless communication system

无线通信系统中电波传播路径损耗模型研究

The results of prediction agree well with the measurement.

该模型的路径损耗预测结果与实际的测量结果比较，符合较好。

Wireless Localization Algorithm Based on Path Loss Model Parameter Real-time Estimate

基于路径损耗模型参数实时估计的无线定位方法

Path-Loss Based Distributed Topology Control Algorithm for Wireless Sensor Networks

基于路径损耗的无线传感器网络分布式拓扑控制算法

Research on Eddy Current Losses in Radial Magnetic Bearings Based on ANSYS;

基于ANSYS的径向磁力轴承涡流损耗研究

Water Consumption Analysis of the Middle Reaches in Tarim River between 1961 and 2005

1961—2005年塔里木河中游径流量损耗分析

Brief Analysis on the Energy-saving of Highway Transportation;

影响公路运输能耗的因素和节能途径

Strengthening Reactive Voltage Management to Lower Power Line Loss;

加强无功电压管理 降低电网线路损耗

Problems of Using Proportion of Transmission Line and Loss Allocation;

输电线路的利用份额及损耗分摊问题

Analysis how to Strengthen Management to Reduce Distribution Line Losses

浅析通过强化管理降低配电线路损耗

Study on Low Loss Connecting between Small Core Diameter Er￣(3+)-Doped Fiber and Single Mode Fiber

小芯径掺铒光纤与单模光纤低损耗接续的研究

Measurement of spectrum loss of large-core optical fiber

大芯径石英阶跃光纤光谱损耗测量研究

Runoff Consumption Characteristics and Causes Analysis of the Middle Reaches in Tarim River

塔里木河中游径流量损耗特征及原因分析

Branch Loss Allocation Based on Circuit Theories and Orthogonal Projection

基于电路理论与正交投影的支路损耗分摊方法

Two-Stage Scan Architecture for Low Power Path Delay Fault Scan Testing;

基于两级扫描结构路径延迟故障的低功耗测试

A Study on Approach to Make institutional Reform of Mining Cities′ Industry Based on Dissipative Structure Theory;

耗散结构视角下的矿业城市产业转型路径

Path analysis on the influence of producer services on manufacturing energy intensity

生产性服务业影响制造业能耗强度的路径分析