• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.7
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• pp.1520-1525
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• 2009

In this paper, we study and simulate the suggested position control system using GPS and USN to replace the existing control system of a crane. For the correct approach, the position control system of a crane is divided into the control system of the ground station and the mobile station The hardware is comprised of GPS receiving module to receive the position control data of a crane from GPS satellites, bluetooth communication module for the data communication between the ground station and the mobile station, supersonic sensor module for a precise position control of a crane, motor to replace a crane roller, embedded MCU(ATmega128L) and so on. In here, an embedded MCU controls GPS receiving module, bluetooth communication module and supersonic sensor module. The Software is comprised of three programs. Three programs are the program to filter GGA output part in a receiving data of GPS receiving module, the driving program for supersonic sensor module, the digital map program to monitor a crane location. From the simulation results, it is demonstrated that the proposed system has the capability of crane position control with 1cm precision.

• The Journal of the Korea institute of electronic communication sciences
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• v.9 no.12
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• pp.1373-1380
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• 2014

In order to calculate accurate traffic and traffic speed, qualified and sufficient GPS data should be provided. However, it is difficult to provide accurate traffic information using restricted GPS data from probe vehicles because of communication costs. This paper developed a algorithm that recovers links omitted by restricted GPS data with topology information, and calculate traffic speed with original links and recovered links. T traffic information service of city with a new algorithm can provide more accurate traffic and traffic speed than the original system.

• The Journal of the Korea institute of electronic communication sciences
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• v.13 no.1
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• pp.229-236
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• 2018

In this paper, we see the acquisition and tracking of L1 C/A signal on GPS receiver, do the research on GPS signal capture principle's foundation, and do the simulation of the GPS signals capture process for it's realizing and analyzing by Matlab. The simulation result, we can confirm this method's accuracy and the feasibility, and see that a satellite receiving ability play an important role in the efficiency of receiver.

• Journal of Digital Contents Society
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• v.18 no.4
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• pp.761-768
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• 2017

As the loss prevention system using bluetooth has a short communication range, it has a problem which its location is not known if it is strayed out of a certain distance. To overcome shortcoming of such an existing loss prevention system, this paper proposes a GPS-based wireless loss prevention system without communication fee using the LoRa Communication with a long distance. The proposed system performs a remote control application on the smart-phone and then is able to get a long-distance GPS coordinates about the location of the loss prevention system on the google map. For performance evaluation of the implemented proposed system, the experiments for transmitting and receiving data are done in open terrain, indoor and outdoor areas and the experiment results identified the superiority of the proposed system in the long-distance.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.04b
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• pp.1273-1276
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• 2002

기존 RTK-GPS는 고가의 장비인 RF방식의 무선모뎀을 사용함으로써 무선국의 허가, 전파의 지리적 장애물에 의한 영향, 전송거리의 제한, 주파수 혼신, 주파수 자원의 유한성 등의 문제점이 있다. 본 논문에서는 이러한 문제점을 해결하기 위해 휴대전화를 전송 매체로 이용하여 보정 데이터를 송 수신하는 방법으로, PDA 환경하에서 RTK-GPS 보정 데이터를 전송하는 시스템을 설계 및 구현하였다. 기준국의 서버는 GPS 수신기와 연결된 RS-232 시리얼 포트로부터 보정 데이터를 수신하여 휴대전화와 연동을 통한 이동국의 PDA 단말기로 보정 데이터를 전송하고, RS-232 시리얼 포트를 통해 이동국의 GPS수신기에 전달한다. 이동국의 측위프로그램은 GPS수신기로부터 RSC-232 시리얼 포트를 통한 위치 정보를 수신하여 상대측위를 하게되며, 정확한 위치 측정이 이루어진다.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.11a
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• pp.1155-1156
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• 2023

본 논문은 다수의 저정밀 GPS(Global Positioning System) 센서를 활용하여, 보다 정밀하고 정확한 GPS 좌표 보정 모델을 설계하고자 한다. 제안 모델에서는 다수의 저정밀 센서에서 GPS 좌표를 수합한 뒤, 최소자승법과 선형칼만필터로 값을 보정한다. 본 논문에서는 Horizontal Accuracy 가 2m 인 저정밀 GPS 센서를 활용하여 제안 모델을 설계하였으며, 저정밀 센서와 제안 모델 비교 실험에서 제안 모델의 46% 정밀도 향상을 확인하였다.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.85-86
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• 2011

철도운영효율 향상을 위하여 첨단 기술을 기반으로 하는 스마트 철도 기술에 대한 개발 및 실용화 사업이 전 세계적으로 진행중에 있다. 철도의 수송력 증대와 운영비용 감소 및 시스템 변경 용이성등의 장점을 극대화하기 위하여 기존의 궤도회로 중심의 열차제어 시스템에서 통신기술을 기반으로 하는 열차제어시스템으로의 전환을 위한 많은 연구가 이루어지고 있다. 본 논문에서는 CBTC 시스템에서 GPS시스템의 적용 타당성 여부를 검증하였고 CBTC 시스템에서의 위치 정보 수신을 위한 GPS 수신데이터의 정합 알고리듬에 관한 저전력 분할 연산 알고리듬을 설계하여, 본 논문에서 제안한 코드는 기존의 수신데이터의 정합알고리듬 대비 2% 면적이 감소하는 것을 확인할 수 있었으며, 또한 전력소모가 7% 감소되는 것을 확인할 수 있었다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.26 no.5
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• pp.455-462
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• 2015

In this paper, we suggested multiband antenna that can be equipped on a inflatable life-jacket, operating VHF-DSC band(156 MHz), COSPAS-SARSAT band(406 MHz) and GPS band(1,575 MHz) for search and rescue survivors quickly. The GPS band antenna was implemented with a square ring-slot planar antenna, and the COSPAS-SARSAT and VHF-DSC band antenna were implemented meander type dipole antennas. In order to place the antenna on a life-jacket, we installed it on 0.2 mm thickness FR-4 substrate to obtain a flexibility. It appeared that the antenna has -14.6 dB, -30.9 dB, and -18 dB return loss in COSPAS-SARSAT, GPS, and VHF-DSC band, respectively. In addition, its gain has 0.83 dBi, 2.1 dBi in COSPAS-SARSAT and GPS band, respectively.

• Journal of Advanced Navigation Technology
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• v.26 no.6
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• pp.464-473
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• 2022

In this paper, about a lightweight design that satisfies the performance of UHF-GPS Antenna used in autonomous underwater vehicle is proposed. Structural analysis, watertight external pressure test and non-destructive testing used in the design process are decided in consideration of structural safety for operating external forces in the underwater environment. First, the material of radome is selected for the performance of the UHF-GPS Antenna for communication with the carrier on the underwater operation in consideration of the 20 bar pressure generated. And the material of radome as PA-GF is selected by conducting electromagnetic field analysis and structural analysis and by considering high strength, rigidity and high dielectric constant. Electromagnetic field analysis and structural analysis by the thickness of radome are additionally performed in order to satisfy the required weight of UHF-GPS antenna. After selecting the final model, its structural safety is verified through watertight external pressure test and non-destructive testing.

• The Journal of the Korea institute of electronic communication sciences
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• v.12 no.1
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• pp.61-68
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• 2017

In this paper, the coarse acquisition code (C/A code), for civil navigation, of the ranging codes for Global Positioning System (GPS) is studied, simulated and analyzed by using Matlab. We can see with the simulation results that the correctness of the method and feasibility, which is at simulation platform to further study on the real environment of GPS signal, can be confirmed. With using this results, we think, the complexity of tracking the satellite signal environment can be captured, and the performance of satellite receiver will be improved.