查询词典 trilateration survey

This research focuses on evaluating the accuracies of trilateration and offset methods. In this research, two accident scenes are setup: one is on the flat road, and another one is on the hill.

除此之外，本研究在直角坐标法中，增加距离的观测量，配合三角几何条件，藉此弥补基准线与基准线外之测量点的连线不成直角的情形。

In this paper the accuracy of the precision engineering control networks (Trilateration and Triangulation), established by using modern electronic distance measuring instruments and theodolites is discussed, and the method of optimization design is proposed that is based on the theory of probability and error propagation and applying the error ellipses to analyze the position accuracy of the points.

本文论述用近代光电测距仪及经纬仪建立的精密工程控制网的精度，并提出基于概率论与误差传播理论的、用误差椭圆来分析点位精度的优化设计方法。建议的平差计算与精度评定方法以专用的计算机程序来完成。

Trilateration can cause significant errors without aiming at the target. As for the offset method, it would have wrong positions if the angle is not 90 degrees.

为了探讨这两种方法的正确性，本研究以将上述二法分别在平地及斜坡施测，将所获得之结果与电子光波经纬仪的结果做一比较。

Wireless sensor networks;node location;RSSI;triangle and centroid location algorithm;trilateration algorithm

无线传感器网络；节点定位；RSSI；三角形质心定位算法；三边测量法

Based on the attenuation model of plume source, this paper studies the location of the plume source using maximum likelihood estimation algorithm and direct trilateration algorithm.

本文基于气体污染源浓度衰减模型，首次采用极大似然预估算法、直接三边测距算法对气体污染源定位进行了对比研究。

In addition to trilateration and offset method with tapes and walking measuring wheels, a total station is employed to measuring angles and distances. With the measured angles and distances, the correct positions are calculated with the geometric principles.

从实验所获的的数据，本研究发现﹕运用直角坐标法，可获得接近电子光波经纬仪的量测结果；亦即，在绘制交通事故现场图时，直角坐标法所获的结果较三定点法佳。

After concretely analyzing three triangles which are Sino-Indian-US relations, Sino-Indian-Russian relations, and Sino-Indian-Pakistan relations, the author thinks that all these trilateration relations appear benign interaction direction since the end of Cold War, the influence of external factors on Sino-Indian relations become weak but its passive influence is still severe.

通过具体分析中印美、中印俄和中印巴这三个三角关系，认为冷战结束以来，各三边关系出现了良性互动的趋势，外部因素对中印关系的影响有所减弱，但是外部因素对中印关系的消极影响仍然严重。

Furthermore, they continuously transmit radio signals of low power and ultra high frequency. They are also equipped with atomic clocks. When GPS receivers intend to calculate its GPS position on the earth, they will receive the signals from satellites, calculate transmission time with a pre-stored ephemeri, and then calculate the distances between themselves and at least four GPS satellites with the method of trilateration.

所有的卫星架有原子钟，当GPS接收器要找出自己目前在地球表面上的位置时，会接收各卫星的讯号，并依储存的星历表计算传送时间，再利用三边测量法订出自己与至少四颗GPS卫星之间的精确距离，即可算出所在位置。

Develops an emulator for single target tracking of acoustic wireless sensor networks in Visual C++ 6.0 and MATLAB 6.5, and extensive simulations have been conducted to characterize performance of the node self-organizing algorithm, weighted-centroid target localization algorithm and trilateration.

在Windows操作系统平台上，使用Visual C++6.0和MATLAB 6.5开发了一个基于声音的无线传感器网络单目标跟踪仿真实验平台WinWSNSim，并在该平台上，对基于声音能量的传感器网络节点自组织策略、加权质心定位算法以及三边测量定位算法进行了仿真实验。

In this algorithm, the Received Signal Strength Indicator ranging technique is employed to replace the distance measurement of one hop away from the anchor node in DV-Hop algorithm. Also a 2-D Hyperbolic algorithm is used to replace the trilateration algorithm in DV-Hop.

该算法引入接收信号强度指示器测距技术代替DV-Hop算法中到锚节点一跳距离测量并采用2-D Hyperbolic算法代替DV-Hop算法中三边测量法。

The dissecting of samples in group2 were difficult. The root of pulmonary artery and ascending aorta failed to be unfolded because fibrous tissue was tough, right and left fibrous trigone were too firm to be solved by hand. Cardiac muscle fibers couldn't be stripped along myofibrillar trajectory since they were prone to break because of their friability.

组2的心脏解剖困难，表现为纤维组织坚韧，游离肺动脉非常困难；徒手无法松解左、右纤维三角，肺动脉和主动脉根部的游离非常困难；心肌纤维坚硬、质脆，解剖时容易断离成碎块，无法沿纤维走行方向剥离。

We have battled against the odds in a province that has become increasingly violent.

我们对在一个争夺日益激烈省的可能性。