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The accuracy and precision of microseismic event locations were measured, analyzed, and compared for two types of location systems: "anolog" and "digital".


Mininginduced microseismic event location errors: Accuracy and precision of two location systems


Differences were found in the pheromonally mediated mate location systems of two subspecies of Hemileuca electra, H.


The present study shows that the VLF level is determined to a high degree by fairly well defined areas with lightning discharges, which can be localized with automatic lightning location systems or forecasted by the weather services.


To date, research involving such systems in the indoor environment has concentrated on the development of cheap, realisable, accurate location systems rather than the continued maintenance of the associated world model needed to derive context.

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 This paper describes the principles and implementation of scene matching used in position location systems in brief. Several essential problems in scene matching technique are reviewedt measures of similarity (MAD, MSD, PROD, NPROD, Pair Functions etc. )are outlined; fast search methods(resolution from coarse to fine, quantization from coarse to fine, feature extraction, modified SSDA etc. )are introduced; probability of acquisition for max. or min. algorithm is given; preprocessing of images (filtering,... This paper describes the principles and implementation of scene matching used in position location systems in brief. Several essential problems in scene matching technique are reviewedt measures of similarity (MAD, MSD, PROD, NPROD, Pair Functions etc. )are outlined; fast search methods(resolution from coarse to fine, quantization from coarse to fine, feature extraction, modified SSDA etc. )are introduced; probability of acquisition for max. or min. algorithm is given; preprocessing of images (filtering, restoration, whitening etc. )is considered; geometrical distortion(synchronization error, rotation, scale factor, perspective distortion)and its effects are analyzed, and the methods for overcoming such effects are presented.After then, two noticeable important techniques for homing seeker, the feature matching and the correlation tracking, are remarked. Several methods of feature extraction are introduced for such features in scene matching as invariant moments, edge features, line features, planar features, vertex features etc. . The emphasis is put on feature selection, update and replacement in terminal target homing.Finally, the block diagrams of a combined optimum aided navigation system and a homing seeker using correlation tracking are given.  本文概述了匹配定位原理、方法及相似度度量、快速搜索、正确匹配概率、预处理、几何失真及其改善等问题,还指出了特征匹配及匹配寻的跟踪等两个值得重视的发展趋势。最后给出了相关匹配技术在组合导航及导引头中应用的结构组成。  A new mathematical method for the calculation of passive unknowncoordinate clock synchronization and selfposition location of user's terminals in time division multiple access communication andposition location systemuser motion equation uniformizing method is devised. Using this method, we havecarried out the real time processing of cloak synchronization and position location, through system test of user's terminal and real time environment simulator. The results of the real time... A new mathematical method for the calculation of passive unknowncoordinate clock synchronization and selfposition location of user's terminals in time division multiple access communication andposition location systemuser motion equation uniformizing method is devised. Using this method, we havecarried out the real time processing of cloak synchronization and position location, through system test of user's terminal and real time environment simulator. The results of the real time processing are provided.  本文提出适用于机动用户的时分多址通讯、定位系统完成终端无源未知坐标时钟同步及自身定位推算的一种数学方法—用户运动方程匀速化方法。作者通过用户终端与系统环境模拟器联试,用该法进行了时钟同步及定位实时处理。文中给出了实验结果。  This paper presents an algorithm based on TOA (Time of Arrival) and azimuth measurement. The location principle and feasibility of the technique are analysed in detail. For some bistatic radar systems with receivers which locate and track 3D moving targets by means of passive method, it is sometimes difficult to measure elevation angle of targets. Therefore the algorithm proposed in the paper is clearly of great importance to the practicability of bistatic passive location systems. The performance of... This paper presents an algorithm based on TOA (Time of Arrival) and azimuth measurement. The location principle and feasibility of the technique are analysed in detail. For some bistatic radar systems with receivers which locate and track 3D moving targets by means of passive method, it is sometimes difficult to measure elevation angle of targets. Therefore the algorithm proposed in the paper is clearly of great importance to the practicability of bistatic passive location systems. The performance of this algorithm is evaluated with the help of computer simulation ( according to Monte Carlo Methods ) for typical target paths.  本文提出了一种基于TOA(到达时间)和方位角测量的算法,详细分析了该技术的定位原理和可行性。在某些接收机以被动方法对三维运动目标定位跟踪的双基地雷达系统中,往往难以测量目标的俯仰角;因此本文提出的算法对于双基地被动定位系统的实用性明显地具有很重要的意义。文中通过典型目标航迹的计算机仿真 (按照Monte Carlo方法)对算法的性能做了评估。   << 更多相关文摘 
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