• Title/Summary/Keyword: Trajectory Analysis

Search Result 948, Processing Time 0.032 seconds

Analysis of ADS-B ground trajectory data using non-aviation approval public data (공공용 정보를 이용한 ADS-B 지상 항적 자료 분석)

  • Ku, SungKwan;Baik, Hojong
    • Journal of the Korean Society for Aviation and Aeronautics
    • /
    • v.23 no.4
    • /
    • pp.6-11
    • /
    • 2015
  • In this study, we surveyed analysis of ADS-B ground trajectory data using non-aviation approval public data. For analysis used non-aviation public data and commercial ADS-B receiver. The study result is available using ADS-B ground trajectory data for airfield surveillance on limited range. Also, to confirmed of available using non-aviation public data for aviation research.

Study on Trajectory Prediction Accuracy Analysis Method for Performance Improvement of a Trajectory Prediction Module of Arrival Manager (도착관리시스템 궤적 예측 모듈의 성능 개선을 위한 궤적 예측 정확도 분석 방법 연구)

  • Oh, Eun-Mi;Kim, Hyounkyoung;Eun, Yeonju;Jeon, Daekeun
    • Journal of the Korean Society for Aviation and Aeronautics
    • /
    • v.23 no.3
    • /
    • pp.28-34
    • /
    • 2015
  • An analysis method of trajectory prediction has been suggested and the developed trajectory prediction module, which is an important functional component of the Arrival Manager (AMAN) of Jeju airport, has been tested by applying the suggested method. The objective of this method is to improve prediction performance of the trajectory prediction module. The trajectory prediction module predicts the trajectories based on the real-time track data and flight plans. Therefore, the suggested analysis method includes the simulation framework which is based on real-time playback, recording, and graphic display systems for testing. Besides, the definition of time error, which is a important index for the time based scheduling system, such as AMAN, is included in the suggested analysis method. An example of arrival time prediction accuracy improvement through the suggested analysis method has also been presented.

Effect of Application of Streamline and Mobility Function on Bubble-Floc Collision Efficiency for Trajectory Analysis of DAF Process (DAF공정의 궤적분석에서 유선과 운동함수의 적용이 기포와 플록의 충돌효율에 미치는 영향)

  • Kim, Seong-Jin;Kwak, Dong-Heui;Lim, Young-Hwan
    • Journal of Korean Society on Water Environment
    • /
    • v.20 no.6
    • /
    • pp.676-684
    • /
    • 2004
  • Many researchers have been carrying on study to figure out the exact collision efficiency between bubble and floc. Collision efficiency can has generally been quantified by using trajectory analysis which uses the hydrodynamic, the electrostatic and van der waals forces. Two types of method are considered to induce the hydrodynamic force in the trajectory analysis. One is to use stream function and the other is to use mobility function. There was some difference between stream and mobility function depending upon modelling factors and conditions in trajectory analysis.

A Prediction Method for Sabot-Trajectory of Projectile by using High Speed Camera Data Analysis (고속카메라 데이터 분석을 통한 발사체 지지대 분산 궤적의 근사적 예측 방법)

  • Park, Yunho;Woo, Hokil
    • Journal of the Korea Institute of Military Science and Technology
    • /
    • v.21 no.1
    • /
    • pp.1-9
    • /
    • 2018
  • In this paper, we have proposed a prediction method for sabot-trajectory of projectile using high speed camera data analysis. Through analyzing trajectory of sabot with high speed camera data, we can extract its real velocity and acceleration including effects of friction force, pressure of flume, etc. Using these data, we suggest a prediction method for sabot-trajectory of projectile having variable acceleration, especially for minimum and maximum acceleration, by using interpolation method for velocity and acceleration data of sabot. Also we perform the projectile launching tests to achieve the trajectory of sabot in case of minimum and maximum thrust. Simulation results show that they are similar to real tests data, for example velocity, acceleration and the trajectory of sabot.

Comparative Analysis of Cartesian Trajectory and MultiVane Trajectory Using ACR Phantom in MRI : Using Image Intensity Uniformity Test and Low-contrast Object Detectability Test (ACR 팬텀을 이용한 Cartesian Trajectory와 MultiVane Trajectory의 비교분석 : 영상강도 균질성과 저대조도 검체 검출률 test를 사용하여)

  • Nam, Soon-Kwon;Choi, Joon-Ho
    • Journal of radiological science and technology
    • /
    • v.42 no.1
    • /
    • pp.39-46
    • /
    • 2019
  • This study conducted a comparative analysis of differences between cartesian trajectory in a linear rectangular coordinate system and MultiVane trajectory in a nonlinear rectangular coordinate system axial T1 and axial T2 images using an American College of Radiology(ACR) phantom. The phantom was placed at the center of the head coil and the top-to-bottom and left-to-right levels were adjusted by using a level. The experiment was performed according to the Phantom Test Guidance provided by the ACR, and sagittal localizer images were obtained. As shown in Figure 2, slices # 1 and # 11 were scanned after placing them at the center of a $45^{\circ}$ wedge shape, and a total of 11 slices were obtained. According to the evaluation results, the image intensity uniformity(IIU) was 93.34% for the cartesian trajectory, and 93.19% for the MultiVane trajectory, both of which fall under the normal range in the axial T1 image. The IIU for the cartesian trajectory was 0.15% higher than that for the MultiVane trajectory. In axial T2, the IIU was 96.44% for the cartesian trajectory, and 95.97% for the MultiVane trajectory, which fall under the normal range. The IIU for the cartesian trajectory was by 0.47% higher than that for the MultiVane trajectory. As a result, the cartesian technique was superior to the MultiVane technique in terms of the high-contrast spatial resolution, image intensity uniformity, and low-contrast object detectability.

The Driving Trajectory Measurement and Analysis Techniques using Conventional GPS Sensor for the Military Operation Environments (군운용 환경에 적합한 GPS 센서기반 주행궤적 측정 및 분석 기술)

  • Jung, Ilgyu;Ryu, Chiyoung;Kim, Sangyoung
    • Journal of the Korea Institute of Military Science and Technology
    • /
    • v.20 no.6
    • /
    • pp.774-780
    • /
    • 2017
  • The techniques for driving trajectory calculation and driving trajectory distribution calculation are proposed to analyze the durability of ground vehicles effectively. To achieve this aim, the driving trajectory of a vehicle and the driving trajectory distribution of that are needed, in addition to road profile. The road profiles can be measured by a profilometer but a driving trajectory of a vehicle cannot be acquired effectively due to a large position error from a conventional GPS sensor. Therefore two techniques are proposed to reduce the position error of a vehicle and achieve the distribution of driving trajectory of that. The driving trajectory calculation technique produces relative positions by using the velocity, time and heading of a vehicle. The driving trajectory distribution calculation technique produces distributions of the driving trajectory by using axis transformation, estimating reference line, dividing sectors and plotting a histogram of the sectors. As a results of this study, we can achieve the considerably accurate driving trajectory and driving trajectory distribution of a vehicle.

Analysis of the elliptical shooting trajectory for tuna purse seine (참치선망어선의 타원형 투망궤적 분석)

  • LEE, Da-Yun;LEE, Chun-Woo;CHOI, Kyusuk;JANG, Yongsuk
    • Journal of the Korean Society of Fisheries and Ocean Technology
    • /
    • v.56 no.1
    • /
    • pp.1-10
    • /
    • 2020
  • In the previous study, a shooting trajectory assuming that the purse seine shooting trajectory is a circle was proposed based on the speed and direction of the movement of the fish school. However, in practice, a trajectory that is closer to an elliptical shape than a circular one is often formed. In this study, the existing circular trajectory and the elliptical trajectory methods were compared under the same conditions to confirm the effectiveness of elliptical shooting trajectory. In addition, changes in the eccentricity of ellipses were derived to assess which type of ellipse was appropriate as a shooting trajectory. When a high-speed fish school moves in a straight line, an elliptical shooting trajectory with the eccentricity of 0.7 to 0.9 will be reasonable, and for middle-low speed fish school, an elliptical shooting trajectory with the eccentricity of 0.4 to 0.6 will be more useful than a circle shooting trajectory.

[Retracted]Hot Spot Analysis of Tourist Attractions Based on Stay Point Spatial Clustering

  • Liao, Yifan
    • Journal of Information Processing Systems
    • /
    • v.16 no.4
    • /
    • pp.750-759
    • /
    • 2020
  • The wide application of various integrated location-based services (LBS social) and tourism application (app) has generated a large amount of trajectory space data. The trajectory data are used to identify popular tourist attractions with high density of tourists, and they are of great significance to smart service and emergency management of scenic spots. A hot spot analysis method is proposed, based on spatial clustering of trajectory stop points. The DBSCAN algorithm is studied with fast clustering speed, noise processing and clustering of arbitrary shapes in space. The shortage of parameters is manually selected, and an improved method is proposed to adaptively determine parameters based on statistical distribution characteristics of data. DBSCAN clustering analysis and contrast experiments are carried out for three different datasets of artificial synthetic two-dimensional dataset, four-dimensional Iris real dataset and scenic track retention point. The experiment results show that the method can automatically generate reasonable clustering division, and it is superior to traditional algorithms such as DBSCAN and k-means. Finally, based on the spatial clustering results of the trajectory stay points, the Getis-Ord Gi* hotspot analysis and mapping are conducted in ArcGIS software. The hot spots of different tourist attractions are classified according to the analysis results, and the distribution of popular scenic spots is determined with the actual heat of the scenic spots.

Reference Trajectory Analysis of Atmosphere Re-entry for Space Vehicle (우주비행체의 대기권 재진입 기준궤적 해석)

  • 이대우;조겸래
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.17 no.6
    • /
    • pp.111-118
    • /
    • 2000
  • The design of reference trajectory with respect to drag acceleration is necessary to decelerate from hypersonic speed safely after atmosphere re-entry of space vehicle. The re-entry guidance design involves trajectory optimization, generation of a reference drag acceleration profile with the satisfaction of 6 trajectory constraints during the re-entry flight. This reference drag acceleration profile can be considered as the reference trajectory. The cost function is composed of the accumulated total heating on vehicle due to the reduction of weight. And a regularization is needed to prevent optimal drag profile from varying too fast and achieve realized trajectory. This paper shows the relations between velocity, drag acceleration and altitude in drag acceleration profile, and how to determine the reference trajectory.

  • PDF

Compensation of Errors on Car Black Box Records and Trajectory Reconstruction Analysis (자동차 블랙박스 기록 오차 보정과 경로 재구성 해석)

  • Yang, Kyoung-Soo;Lee, Won-Hee;Han, In-Hwan
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.12 no.6
    • /
    • pp.182-190
    • /
    • 2004
  • This paper presents reconstruction analysis of vehicle trajectory using records of a developed black box, and results of validation tests. For reconstruction of vehicle trajectory, the black box records the longitudinal and lateral accelerations and yaw-rate of vehicle during a pre-defined time period before and after the accident. One 2-axis accelerometer is used for measuring accelerations, and one vibrating structure type gyroscope is used for measuring yaw-rate of vehicle. The vehicle's planar trajectory can be reconstructed by integrating twice accelerations along longitudinal and lateral directions with yaw-rate values. However, there may be many kinds of errors in sensor measurements. The causes of errors are as follows: mis-alignment, low frequency offset drift, high frequency noise, and projecting 3-dimensional motion into 2-dimensional motion. Therefore, some procedures are taken for error compensation. In order to evaluate the reliability and the accuracy of trajectory reconstruction results, the black box was mounted on a passenger car. The vehicle was driven and tested along various specified lanes. Through the tests, the accuracy and usefulness of the reconstruction analysis have been validated.