• Title/Summary/Keyword: IMU/GPS

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Target Geolocation Method Using Target Detection in Infrared Images (적외선 영상의 탐지 정보를 이용한 표적 geolocation 기법)

  • Kim, Jae-Hyup;Jeong, Jun-Ho;Seo, Jeong-Jae;Lee, Jong-Min;Moon, Young-Shik
    • Journal of the Korea Society of Computer and Information
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    • v.20 no.3
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    • pp.57-67
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    • 2015
  • In this paper, we proposed the geolocation method using target detection information in infrared images. Our method was applied to geolocation system of hostile targets in ground-to-ground field. The major distortion that has bad effect of geolocation was composed of optic, topography, GPS(Global Positioning System) and IMU(Inertial Measurement Unit) of reconnaissance unit. We proposed enhanced geolocation method to cope with optic and topography distortion using polynomial fitting and slant-range calculation model to overcome earth curvature problem, and the result showed that the performance of our method was good for system requirements.

3D Positioning Accuracy Estimation of DMC in Compliance with Introducing High Resolution Digital Aerial Camera (고해상도 디지털항공사진 카메라 도입에 따른 DMC의 3차원 위치결정 정확도 평가)

  • Hahm, Chang-Hahk;Chang, Hwi-Jeong
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.27 no.1
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    • pp.743-750
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    • 2009
  • Since aerial photogrammetry by analog camera began in 1972, recently, high resolution digital camera is actively introduced to improve efficiency of aerial photogrammetry. This study investigated the 3D positioning accuracy of DMC(Digital Mapping Camera) among various high resolution aerial digital cameras to be developed for photogrammetry. For the research, we installed control points in test field around Incheon, and acquired analog and digital aerial photographs. By comparing 3D positioning accuracies of analog and digital photographs, there are few difference between two cameras, and the 3D positioning accuracies of two cameras was somewhat increased in case of aerotriangulation using additional control points based on GPS/IMU EO data.

EGI Velocity Integration Algorithm for SAR Motion Measurement

  • Lee, Soojeong;Park, Woo Jung;Park, Yong-gonjong;Park, Chan Gook;Song, Jong-Hwa;Bae, Chang-Sik
    • Journal of Positioning, Navigation, and Timing
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    • v.8 no.4
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    • pp.175-181
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    • 2019
  • This paper suggests a velocity integration algorithm for Synthetic Aperture Radar (SAR) motion measurement to reduce discontinuity of range error. When using position data from Embedded GPS/INS (EGI) to form SAR image, the discontinuity of the data degrades SAR image quality. In this paper, to reduce the discontinuity of EGI position data, EGI velocity integration is suggested which obtains navigation solution by integrating velocity data from EGI. Simulation shows that the method improves SAR image quality by reducing the discontinuity of range error. INS is a similar algorithm to EGI velocity integration in the way that it also obtains navigation solution by integrating velocity measured by IMU. Comparing INS and EGI velocity integration according to grades of IMU and GPS, EGI velocity integration is more suitable for the real system. Through this, EGI velocity integration is suggested, which improves SAR image quality more than existing algorithms.

A Study of Effective Method to Update the Database for Road Traffic Facilities Using Digital Image Processing and Pattern Recognition (수치영상처리 및 패턴 인식에 의한 도로교통시설물 DB의 효율적 갱신방안 연구)

  • Choi, Joon-Seog;Kang, Joon-Mook
    • Journal of Korean Society for Geospatial Information Science
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    • v.20 no.2
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    • pp.31-37
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    • 2012
  • Because of road construction and expansion, Update of the road traffic facilities DB is steadily increased each year, and, Increasing drivers and cars, safety signs for traffic safety are required management and additional installation continuously. To update Safety Sign database promptly, we have developed auto recognition function of safety sign, and analyzed coordinates accuracy. The purpose of this study was to propose methods to update about road traffic facilities efficiently. For this purpose, omni-directional camera was calibrated for acquisition of 3-dimensional coordinates, integrated GPS/IMU/DMI system and applied image processing. In this experiment, we proposed a effective method to update database of road traffic facilities for digital map.

Development of Image Capture Program for a Mobile Mapping System along CCD Camera Characteristics (차량측량시스템을 위한 영상취득 프로그램 개발)

  • Jeong, Dong-Hoon;Kim, Byung-Guk
    • Journal of Korea Spatial Information System Society
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    • v.4 no.2 s.8
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    • pp.35-40
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    • 2002
  • In this study we developed a CCD camera image capture program for Mobile Mapping System. Especially, two high resolution color images could be captured and saved simultaneously through this program to apply digital photogrammetry. Program developed in this study could be used more effectively on the 3D positioning of road facilities, the state understanding of maintenance and etc. using Mobile Mapping System with GPS-IMU. Most programs currently developed and used are for the panchromatic images. But, newly developed program is for the high resolution color images. Therefore newly developed program could expand application field of Mobile Mapping System widely, and users. This research can improve the usability of 4S' products with stable and reliable.

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A Study of Realtime Geographic Information Transmission for the Mobile Mapping System (모바일매핑시스템에서의 실시간 지리정보 전송을 위한 연구)

  • Bae Sang-Keun;Park Young-Moo;Kim Byung-Guk
    • Spatial Information Research
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    • v.13 no.1 s.32
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    • pp.91-101
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    • 2005
  • The Mobile Mapping System using the vehicle equipped the GPS, IMU, CCD Cameras is the effective system for the management of the road facilities, update of the digital map, and etc. If the geographic information which is acquired by the Mobile mapping System can be transmitted in realtime, users can process what they want using the latest data. In this research, the effective method was suggested for the transmission of the geographic information acquired by mobile mapping System such as position data, attitude data, and image data in the wireless internet environment in realtime.

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An Efficient Attitude Reference System Design Using Velocity Differential Vectors under Weak Acceleration Dynamics

  • Lee, Byungjin;Yun, Sukchang;Lee, Hyung-Keun;Lee, Young Jae;Sung, Sangkyung
    • International Journal of Aeronautical and Space Sciences
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    • v.17 no.2
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    • pp.222-231
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    • 2016
  • This paper proposes a new method achieving computationally efficient attitude reference system for low cost strapdown sensors and microprocessor platform. The main idea in this method is to define and compare velocity differential vectors, geometrically computed from INS and GPS data with different update rate, for generating attitude error measurements which is further used for filter construction. A quaternion based Kalman filter configuration is applied for the attitude estimation with the adapted measurement model of differential vector comparison. Linearized model for Extended Kalman Filter and low pass filtered characteristics of measurement greatly extend the affordability of the proposed algorithm to the field of simple low cost embedded systems. For performance verification, experiment are done employing a practical low cost MEMS IMU and GPS receiver specification. Performance comparison with a high grade navigation system demonstrated good estimation result.

Tracking of Moving Objects for Mobile Mapping System (모바일매핑시스템에서의 이동객체 추적을 위한 연구)

  • Jung, Jae-Seung;Park, Jae-Min;Kim, Byung-Guk
    • Spatial Information Research
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    • v.14 no.2 s.37
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    • pp.235-244
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    • 2006
  • The MMS(Mobile Mapping System) using the vehicle equipped GPS, IMU and CCD Cameras is the effective system for the management of the road facilities, update of the digital map, and etc. The image, vehicle's 3 dimensional position and attitude information provided MMS is a important source for positioning objects included the image. In this research we applied the tracking technique to the specific object in image. The extraction of important object from immense MMS data makes more effectiveness in this system.

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Implementation and Flight Test Performance Analysis of vSLAM Aided Integrated Navigation System for Rotary UAV (vSLAM 보조 통합항법시스템 구현 및 무인 회전익기를 이용한 비행시험 성능분석)

  • Yun, Suk-Chang;Lee, Byoung-Jin;Yun, Suk-Hwan;Lee, Young-Jae;Sung, Sang-Kyung
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.39 no.4
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    • pp.362-369
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    • 2011
  • In this paper, vSLAM aided integrated navigation system is implemented and performance analysis of the system is completed via flight test. The system can suppress divergence of position error of INS only system by updating vSLAM correction information when temporary GPS signal outage occurs in bad radio condition. In the flight test, integrated hardware containing GPS, IMU and camera is loaded under RC electric helicopter. Performance of the integrated navigation system is verified by comparing estimated position of INS/vSLAM system with that of INS only system.

Development of Integrated Navigation Computer for On/Off Line Processing (실시간/후처리 기법을 고려한 복합 항법 컴퓨터 개발)

  • Jin, Yong;Park, Chan-Gook
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.30 no.8
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    • pp.133-140
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    • 2002
  • In this paper, the structure of integrated navigation computer for experiment is proposed. It is designed for considering the real time processing and data storage capacity. It will be used in missile, aircraft, submarine system and experimental vehicle. The I/O device supports IMU, GPS, odometer, altimeter, depth sensor, inclinometer etc. And the main storage device uses the tape device. That can improve the system stability. Therefore it can be used in a high dynamic or shock environment. The embedded linux is used as an Operating System. For the real time capability, sensor data processing and algorithm processing units are seperated. The time synchronization is referenced by IMU data.