视距传播

特别是，该方法在测量参数有限情况下，性能改善也十分明显。2.提出了一种将视距重构与平滑处理相结合减小非视距传播影响的定位方法。

Moreover , it can achieve obvious performance improvement when the measured parameters are limited . 2 . A position estimate method is proposed , in which the LOS reconstruction and smoothing technique are combined to mitigate the influence due to NLOS propagation .

在实际系统中，信号的传播并不总是沿着视距传播，如何消除或减小非视距误差（NLOS）对定位精度的影响是无线传感网络定位中的一个核心问题。

In actual systems , the signal does not transmit along line of sight ( LOS ) all the time . How to eliminate or mitigate the influence caused by non line-of-sight ( NLOS ) error is an essential issue to positioning in WSN .

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

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 .

然后通过使用单反射椭圆模型，提出了一种能够有效的抑制非视距传播（NLOS）干扰的定位算法。

And then using elliptical model SLR shoot , and puts forward a kind of inhibition of spread beyond ( NLOS ) interference location algorithm .

主要思想是基于TDOA（到达时间差），考虑NLOS（非视距传播）影响的定位算法。

The main idea is based on a location algorithm of time difference of arrival ( TDOA ) and considering the influence of non-line-of-sight ( NLOS ) .

然后深入研究了在非视距传播环境下基于TOA（TimeOfArrival，信号到达时间）的几何定位算法，提出了一种新的算法，把距离几何定位引入到基站选择中。

Then , a deep research on the geometric location algorithm is done based on TOA ( Time of Arrival , signal arrival time ) against non-line-of-sight propagation . Then a new algorithm is proposed which introduced geometric location method into base station selection .

在非视距传播（NLOS）环境中，到达时间差（TDOA）测量值受NLOS误差的影响而产生偏差[1]，使得Chan算法[2]的定位性能显著下降。

In non-line-of-sight propagation ( NLOS ) environment , the location performance of Chan ′ s algorithm is significantly degraded because the time difference of arrival ( TDOA ) measurement is biased by a NLOS error .

针对这一问题，给出了IEEE802.16标准中基于OFDMA的宽带无线接入非视距传播解决方案。

In this context the authors shall overview the work of one of the IEEE 802.16 standard subcommittee projects that deals with a BWA solution based on OFDM Access ( OFDMA ) aiming at the NLOS scenarios .

移动通信环境中，非视距传播与多径效应引起的信号附加时延是影响TDOA定位精度的主要因素，深入研究信号到达时间差误差的统计特性，有利于进一步提高TDOA定位的精度。

Additional time delay of arrival resulted from non-line of sight ( NLOS ) propagation and muti-path effect in ( cellular ) environment is the dominant factor resulting in TDOA location error , study on the statistical property of TDOA error is useful for improving the accuracy of TDOA location .

非视距传播环境下移动台定位算法研究

The Study of Mobile Location Algorithms for NLOS ( Non-Line-of-Sight ) Environment

消除非视距传播误差的移动定位算法研究

The Study of Mobile Location Algorithm with NLOS Error Mitigation

蜂窝网中一种非视距传播的定位技术

A location technology of non-line-of-sight propagation in cellular networks

视距传播中地面起伏对传播中值衰减的影响

Effect of the Roughness of the Ground - surface on the Line-of-sight Propagation

一种减轻非视距传播影响的移动台定位方法

A Mobile Station Location Method for Mitigating the Influence of the NLOS Propagation

视距传播中电磁波弯曲引起距离误差的探讨

Research on the Distant Error Caused by Electromagnetic Curve in the Visual Distance Spread

移动通信定位中最大的误差来源于电波的非视距传播。

The biggest error of mobile communication location is caused by the non-line-of-sight ( NLOS ) .

室内环境的视距传播模型

Line-of-Sight Propagation Model in Indoor Environment

这种算法数据利用率高，不但可以消除数据测量误差，而且可以消除非视距传播误差。

This algorithm has high data-using efficiency and can eliminate not only measurement errors but also NLOS ( Non Line of Sight ) errors .

同时利用该系统自身特点，避免了许多在固定站系统中多径干扰、非视距传播等定位难题。

Depending on the characteristic of the mobile station system can reduce more influence such as multipath interference and none-line-of-sign ( NLOS ) propagation than fixed station .

蒸发波导是形成海上微波超视距传播的主要机制，波导模态理论用于研究微波在蒸发波导中的传播特性，但求解过程复杂，计算时间较长不适于实时应用。

Waveguide mode theory is used to study the characteristics of microwave propagation in the evaporation duct , but longer calculation time is not suitable for real-time applications .

大气波导可以使电磁波陷获在波导层结内实现超视距传播，将影响在其中传播的无线电信号。

Atmospheric duct can guide radio waves to distances far beyond the horizon with less attenuation , which will have a significant impact on the spread of radio signals .

本文以定位算法与定位参数估计为主线，综述了蜂窝通信系统中移动台定位的发展过程、现状、取得的进展以及面临的挑战，特别是对减轻非视距传播影响的定位算法进行了详细讨论。

Based on the methods of location estimating and location parameter estimating , the development history of current and future challenges in wireless position location are reviewed and location estimating techniques for mitigating the influence of non-line-of-sight ( NLOS ) propagation are discussed .

超视距雷达传播模式识别

Identity of Propagation Modes for Over the Horizon Radar

该模型在相应的条件下分别可转变为波束波水平视距路径传播的闪烁模型和平面、球面波的闪烁指数模型。

Under some conditions , the model can be converted into the scintillation index model for beam wave propagation on horizontal sight paths and also degraded to plane and spherical wave scintillation models , respectively .

UWB室内视距环境多径传播模型

Multipath model for UWB indoor LOS environments

结果表明视距的室内传播环境中不同的天线阵列结构对MIMO系统容量ccdfs有不同的影响，而且天线间隔越小，影响越显著。

The results show that different antenna array structures affect the ccdfs differently in LOS indoor environments and the less antenna spacing is , the more capacities change of the MIMO channel will be .

天波超视距雷达在传播过程中会受到电离层的相位干扰，这将导致信号频谱的展宽，电离层的相位污染影响了雷达的探测性能。

In sky-wave over-the horizon radar ( OTHR ), radar signals are subjected to a variety of distortion and contamination effects as they propagate through the ionosphere , leading to severe degradation of the detection capability of OTHR radar .

但是在非视距（NLOS）传播环境下Chan算法精度会受到较大的影响，从而影响到Taylor级数展开法的定位精度。

But Chan 's accuracy degrades greatly in the non line of sight ( NLOS ) propagation environment and then it will influ - ence the accuracy of Taylor series expansion algorithm .

本文基于移动通信环境中非视距（NLOS）传播时延服从指数分布的特性，提出了一种有效减小NLOS影响的定位方法。

Based on the statistical property of the non line of sight ( NLOS ) propagation in the mobile communication environment , an effective location method is presented to mitigate the influence of the NLOS propagation .