Multiple Car-Following Data with Real-Time Kinematic Global Positioning System

2002 ◽  
Vol 1802 (1) ◽  
pp. 166-180 ◽  
Author(s):  
Gemunu Senadeera Gurusinghe ◽  
Takashi Nakatsuji ◽  
Yoichi Azuta ◽  
Prakash Ranjitkar ◽  
Yordphol Tanaboriboon
Keyword(s):  
Reaction Time ◽  
Real Time ◽  
Global Positioning System ◽  
Traffic Engineering ◽  
Quality Data ◽  
Positioning System ◽  
Relative Speed ◽  
Car Following ◽  
Real Time Kinematic ◽  
Global Positioning

The real-time kinematic differential Global Positioning System (GPS) has facilitated a new horizon in traffic engineering. Multiple car-following experiments conducted with a real-time kinematic GPS with 10 vehicles participating in a probing field gave high-quality results in headway, speed, relative speed, and acceleration. The expected accuracies for measuring position and speed were 10 mm and 0.16 km/h, respectively. The vehicles were driven in a loop consisting of two parallel straight sections connected by two semicircular curves. Different driving conditions were induced in the platoon by instructing the leading driver to follow predetermined speed variations. The experiments yielded sets of continuous observations. Headway, speed, and acceleration were measured using conventional equipment for the purpose of comparing accuracy. The accuracy of the data obtained using the GPS was superior to that of the same data obtained using conventional measurements. The variation in driving characteristics down the stream of vehicles was studied using the experimental data. The results showed that the reaction time between a change in relative speed and the corresponding change in acceleration varies during the driving process. The reaction time of individual drivers also changes along the platoon. The good-quality data were able to give high-resolution plots of acceleration and relative speed illustrating that both the reaction time and the functional relationship between acceleration and relative speed do not remain constant.

Application of the Real-Time Kinematic Global Positioning System in Bridge Safety Monitoring

2005 ◽  
Vol 10 (2) ◽  
pp. 163-168 ◽  
Author(s):  
Jinjun Guo ◽  
Liang Xu ◽  
Lianjun Dai ◽  
Mike McDonald ◽  
Jianping Wu ◽  
...  
Keyword(s):  
Real Time ◽  
Global Positioning System ◽  
Safety Monitoring ◽  
Positioning System ◽  
The Real ◽  
Bridge Safety ◽  
Real Time Kinematic ◽  
Global Positioning

Evaluation of CORSIM Car-Following Model by Using Global Positioning System Field Data

2000 ◽  
Vol 1710 (1) ◽  
pp. 114-121 ◽  
Author(s):  
Sastry Chundury ◽  
Brian Wolshon
Keyword(s):  
Data Collection ◽  
Global Positioning System ◽  
Field Data ◽  
Goodness Of Fit ◽  
Positioning System ◽  
Goodness Of Fit Test ◽  
Distance Information ◽  
Car Following ◽  
Wide Range ◽  
Global Positioning

It has been recognized that CORSIM (and its constituent program, NETSIM) is one of the most widely used and effective computer programs for the simulation of traffic behavior on urban transportation networks. Its popularity is due in large part to the high level of detail incorporated into its modeling routines. However, the car-following models, used for the simulation of driver behavior in the program, have not been formally calibrated or validated. Since the model has performed well in a wide range of applications for so many years, it has always been assumed to have an implied validity. This study evaluated the NETSIM car-following models by comparing their results with field data. Car-following field data were collected using a new data collection system that incorporates new Global Positioning System and geographic information system technologies to improve the accuracy, ease, speed, and cost-effectiveness of car-following data collection activities. First, vehicle position and speed characteristics were collected under field conditions. Then simulated speeds and distances were based on identical lead vehicle actions using NETSIM car-following equations. Comparisons of simulated and field data were completed using both graphical and statistical methods. Although some differences were evident in the graphical comparisons, the graphs overall indicated a reasonable match between the field and simulated vehicle movements. Three statistical tests, including a goodness-of-fit test, appear to support these subjective conclusions. However, it was also found that definitive statistical conclusions were difficult to draw since no single test was able to compare the sets of speed and distance information on a truly impartial basis.

scholarly journals Investigation of accurate method in 3-D position using Cors-Net in Istanbul

2012 ◽  
Vol 18 (2) ◽  
pp. 171-184 ◽  
Author(s):  
Kutalmis Gumus ◽  
Cahit Tagi Celik ◽  
Halil Erkaya
Keyword(s):  
Real Time ◽  
Conventional Method ◽  
Global Positioning System ◽  
Complex Structure ◽  
Accurate Method ◽  
Reference Station ◽  
Positioning System ◽  
Virtual Reference ◽  
Global Positioning ◽  
Set Up

In this study, for Istanbul, there are two Cors Networks (Cors-TR, Iski Cors) providing Virtual Reference Station (VRS), and Flachen Korrektur Parameter (FKP), corrections to rover receiver for determining 3-D positions in real time by Global Positioning System (GPS). To determine which method (or technique) provides accurate method for position fixing, a test network consisting of 49 stations was set up in Yildiz Technical University Davudpasa Campus. The coordinates of the stations in the test network were determined by conventional geodetic, classical RTK, VRS and FKP methods serviced by both Cors-TR and Iski Cors. The results were compared to the coordinates by the conventional method by using total station. The results showed a complex structure as the accuracy differs from one component to another such as in horizontal coordinates, Y components by CorsTR_VRS and Cors_TR_ FKP showed 'best' results while the same technique provided X components consistent accuracy with the Y component but less accurate than by real time kinematic (RTK). In vertical components, of all the techniques used for the h components, CorsTR_VRS showed 'best' accuracy with three outliers.

scholarly journals Implementasi Aplikasi Augmented Reality Berbasis Lokasi Untuk Pengenalan Atraksi Wisata di Kota Denpasar

2020 ◽  
Vol 4 (2) ◽  
pp. 339-343
Author(s):  
Bagus Putu Wahyu Nirmala ◽  
Nengah Widya Utama ◽  
Anak Agung Istri Ita Paramitha
Keyword(s):  
Augmented Reality ◽  
Real Time ◽  
Global Positioning System ◽  
Positioning System ◽  
Global Positioning

Memahami nilai-nilai kearifan lokal melalui seni budaya sangat penting agar warisan leluhur tersebut dapat dilestarikan. Kota Denpasar sebagai Ibu Kota Provinsi Bali memiliki nilai-nilai kearifkan lokal yang melekat di berbagai karya seni di kota tersebut seperti arsitektur bangunan, ukiran, lukisan, patung dan sebagainya. Perkembangan teknologi 4.0 saat ini seharusnya dimanfaatkan tidak hanya kepentingan ekonomi di Kota Denpasar namun juga untuk kepentingan sosial budaya. Salah satu teknologi yang bisa dimanfaatkan adalah augmented reality (AR). Pemanfaatan AR untuk kepentingan budaya memiliki tantangan tersendiri namun bukan tidak mungkin dilakukan. Adanya AR akan mempermudah masyarakat dan wisatawan mengakses informasi dari sebuah objek karya seni. Terlebih lagi informasi tersebut dapat diakses secara real time. Dengan semakin banyaknya karya seni budaya yang tersampaikan makna, informasi dan fakta nilai-nilai kearifan lokal yang terkandung didalamnya akan semakian meningkatkan kepedulian wisatawan untuk menghormati, turut melestarikan dan menjaganya. Pengabdian ini dilaksanakan dalam bentuk implementasi aplikasi AR dalam rangka pengenalan atraksi wisata yang berupa karya seni bangunan seperti arsitektur bangunan dan patung. Adapun aplikasi AR yang diimplementasikan berbasis lokasi dengan memanfaatkan teknologi Global Positioning System (GPS).

A Model for Combined GPS and BDS Real-Time Kinematic Positioning using one Common Reference Ambiguity

2018 ◽  
Vol 71 (4) ◽  
pp. 1011-1024 ◽  
Author(s):  
Rui Tu ◽  
Jinhai Liu ◽  
Rui Zhang ◽  
Pengfei Zhang ◽  
Xiaochun Lu
Keyword(s):  
Real Time ◽  
Global Positioning System ◽  
Carrier Phase ◽  
Satellite System ◽  
Phase System ◽  
Combined Model ◽  
Common Reference ◽  
Beidou Navigation Satellite System ◽  
Real Time Kinematic ◽  
Global Positioning

This paper proposes a model for combined Global Positioning System (GPS) and BeiDou Navigation Satellite System (BDS) Real-Time Kinematic (RTK) positioning. The approach uses only one common reference ambiguity, for example, that of GPS L1, and estimates the pseudo-range and carrier phase system and frequency biases. The validations show that these biases are stable during a continuous reference ambiguity period and can be easily estimated, and the other estimated double-differenced ambiguities, such as those of GPS L2, BDS L1, and BDS L2, are not affected. Therefore, our approach solves the problems of a frequently changing reference satellite. In addition, because all the carrier phase observations use the same reference ambiguity, a relationship is established between the different systems and frequencies, and the strength of the combined model is thus increased.

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