视距

GPS自身卫星存在有限视距的缺点，轨道数据库作为一种稳定的导航信息可以弥补上述缺点。

The GPS satellites still have defects like the limited range of visibility , which can be fixed by the stable navigation information & track database .

研究发现在不良天气的影响下，有效视距和道路附着系统显著降低是导致道路交通安全性能下降的主要原因。

The study found that under the influence of adverse weather , the reducing of effective the range of visibility and road friction make traffic safety performance down .

基于改进AHP法的飞机超视距作战能力评估

Over-the-horizon Air Combat Capability Evaluation of Fighter Plane based on Modified AHP

天线阵结构对非视距室内MIMO信道容量的影响

Antenna Array Structures Effect on Capacity of Indoor NLOS MIMO Channel

CDMA移动定位系统中非视距误差的消除算法

Non-line-of-sight error mitigation algorithm in CDMA mobile communication system

在超视距雷达中，需要经过FFT来获得距离信息。

In OTH radars , the range information is obtained by FFT .

UWB室内非视距信道模型研究

A study of UWB indoor NLOS environments channel model

天波超视距雷达的混合多模型PDA航迹起始仿真分析

Simulation Analysis on Track Initiation of Multi-Model PDA Algorithm for Sky-wave OTHR

UWB室内视距环境多径传播模型

Multipath model for UWB indoor LOS environments

基于规格化Hough变换的天波超视距雷达检测前跟踪算法

Track-before-Detect Algorithm for Over-the-Horizon Radar Based on Normalized Hough Transform

第四章定性地分析了天波超视距雷达HF段干扰空、时、频域的不同特点，分别采用各种不同的处理方法进行有效的抑制。

Chapter 4 analyzes the different characteristics in spatial , temporal and frequency domain of HF interference .

一种结合LOS／NLOS识别的非视距距离比例缩放定位算法

One NLOS-Range-Scaling Location Algorithm with LOS / NLOS Identification

基于TDOA的一种简化的非视距误差抑制算法

A simple NLOS error mitigation algorithm based on TDOA mobile location

提高实船平台罗经方位安装精度是超视距作战系统的需要，为此提出用GPS标校平台罗经新方案。

It is the requirement of over the horizon targeting to improve the installation accuracy of platform compass azimuth , so a new concept based on GPS is proposed .

非视距传播环境下对移动用户定位的AOA方法

An AOA location method for the mobile station in NLOS propagation environment

蜂窝网无线定位技术中非视距（NLOS）误差的鉴别及其抑制

Discriminating and restraining of NLOS error in wireless orientation technology of cellular network

克服非视距误差的新型定位算法是基于经典Chan和Taylor算法的协同定位改进的算法。

First overcome the orientation of non line-of-sight error algorithm is based on classical Chan and Taylor algorithm with the localization algorithm .

在非视距的室内环境中，要实现最大的MIMO容量增益，设计天线阵列时应该对天线间隔和阵列阵形综合考虑。

To obtain the MIMO capacity gains in indoor NLOS environment , antenna interval and antenna structure should be considered jointly when designing the antenna array .

减轻TOA和AOA定位系统非视距影响的方法

A New Method for Mitigating the Effect of NLOS Propagation in the TOA and AOA Hybrid Location System

非视距传播（NLOS）是蜂窝网定位误差的最主要来源。

The non-line-of-sight ( NLOS ) propagation is the main source of location error in cellular networks .

提出利用UWB数据传输速率高、多径分辨能力强以及非视距传输等优良特性来传递定位信息；

The locating information is transmitted in the UWB mode which has a high-speed transmission rate , a high multi-pathway resolving power , and a NLOS specialty ;

最后进行WorldWind视距与多分辨率遥感影像匹配，根据视距的大小判断WorldWind分辨等级，根据WorldWind分辨率等级获取与之相适的遥感影响瓦片。

Finally , World Wind sight and multi-resolution remote sensing image matching , according to the size of the horizon to judge World Wind distinguish grade level according to World Wind resolution remote sensing to obtain corresponding effects fitness tiles . 3 .

分布式移动多载舰OTHR（over-the-horizonradar，超视距雷达）系统是将雷达装载在多个移动平台上的功能强大的移动探测系统。

Distributed mobile multi-shipborne OTHR ( over-the-horizon radar ) system is a powerful mobile detection system that is loaded on a number of mobile platforms .

实验表明该算法在非视距（NLOS）环境下能够有效地改善定位精度。

And the results show that the cooperative location method can significantly improve the location accuracy under non-line of sight .

研究了降雨对视距传输的LMDS正交极化产生的影响。

A research of the effect of rainfall on orthogonally polarized LMDS with line-of-sight transmission has been completed .

非视距（NLOS）误差是蜂窝网定位系统的主要误差源，直接影响基于蜂窝网络的定位系统的推广和应用。

Non-line-of-sight error is the key error in cellular mobile position system and directly restricts popularization and application of mobile position system .

由于反射、非视距等因素影响，利用RSSI测距的传统定位方法误差较大。

As the reflective , non-line and other factors , the localization error is greater in traditional positioning methods using RSSI ranging .

提出了三种改进的用卡尔曼滤波器消除到达时间（TimeOfArrival，TOA）测量值中非视距（Non-LineofSight，NLOS）误差的方法。

Three methods of mitigating the NLOS ( non-line of sight ) error in TOA ( time of arrival ) measurements were proposed , all of which were performed by Kalman filter .

仿真结果表明，这种通用信道模型能够准确的描述出宽带MIMO信道的视距（LoS）、非视距（NLoS）、室内外散射特征以及孔径效应。

Simulation results show that this model well describes the LoS , NLoS , indoor , and outdoor scattering properties of broadband MIMO channel as well as the keyhole effect .

通过对该模型的传播时延特征进行分析，本文提出了一种基于圆散射模型的TOA重构方法来克服非视距对定位的影响。

By analyzing the time delay characteristic of this model , a new TOA reconstruction method based on the ring of scatterer model and its improvement is proposed .