• Title, Summary, Keyword: GNSS 무결성 감시

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Design of Integrity Monitor Functions for Maritime DGPS RSIM (해양용 DGPS 기준국의 무결성 감시 기능 설계)

  • Seo, Ki-Yeol;Park, Sang-Hyun;Cho, Deuk-Jae;Suh, Sang-Hyun
    • Journal of Navigation and Port Research
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    • v.33 no.6
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    • pp.395-400
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    • 2009
  • In order to prepare for the DGNSS recapitalization and implementation of the functions for software based reference station and integrity monitor (RSIM) system, this paper proposes a design of integrity monitor functions of maritime differential GPS RSIM. The most critical functions of the integrity monitor (IM) are to generate and send flags to the reference station (RS) along with system feedback. Firstly, it presents the architecture of software based RSIM, and analyzes the performance standard of integrity monitor for maritime DGPS reference station This paper then designs the functions of integrity monitor for DGPS reference station based on the performance standard. Finally, this paper presents the results of performance analysis for the functionality of integrity monitor using the GNSS simulator. it discusses the study method and its application for the system implementation.

GNSS 현대화 사업 추진

  • Lee, Yong-Gyu
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.288-290
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    • 2015
  • GNSS 현대화 사업 추진과정의 배경 및 근거를 제시하고 진행된 해양기준국의 사업과 진행중인 감시국 현대화 사업을 통해 내륙기준국의 현대화 사업계획을 모색하고 더 나은 무결성 측위정보 제공을 위한 국립해양측위정보원에서 하는 일에 대한 발표.

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Development of Remote Integrity Monitoring System for GNSS (GNSS 원격 무결성 감시시스템 개발)

  • Bae, Jung-Won;Song, Jae-Hun;Jeon, Hyang-Sik;Nam, Gi-Uk;Lee, Han-Seong
    • Aerospace Engineering and Technology
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    • v.5 no.2
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    • pp.16-26
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    • 2006
  • GNSS is a satellite-based radio navigation aid. For using it in civil air navigation area, any GNSS service should meet the requirements of accuracy, integrity, continuity and availability in each flight phase established by ICAO. In this study, a remote integrity monitoring system(RIMS) for GNSS are proposed and explained to utilize it in the design of GNSS augmentation system such as GBAS and GRAS. The RIMS consists of signal-in-space receiving subsystem and signal processing subsystem. Each GPS receiver is connected to Host PC by the serial to ethernet converting device which is able to convert serial port connection to LAN port connection in order to exchange information via the internet. We can overcome the siting limitation of GPS receiver and antenna, and reduce signal loses in the cable between GPS antenna and receiver. This system is providing the development environment for GBAS CAT-I system.

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GNSS integrity Performance analysis in Korean region (한국지역에서 GNSS 무결성 감시의 가용성 예측)

  • Shin, Dae-Sik;Cho, Jong-Chul;Kim, Yong-Hyun;Shin, Mi-Young;Han, Sang-Sul;Park, Chan-Sik;Jun, Hyang-Sig;Nam, Gi-Wook;Lee, Sang-Jeong
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.35 no.12
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    • pp.1101-1107
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    • 2007
  • this paper, integrity analysis in Korean region using GPS, modernized GPS, Galileo, SBAS and GBAS is given. The simulation results show that Cat. I requirement can be met using modernized GPS and Galileo alone, however, Cat. II and III are not met even augmenting SBAS because of VPL. A more efficient augmentation such as GBAS reduces VPL to meet Cat. II and III requirements in Korean region. This result will be used to design and implement not only an augmentation system but also regional satellite navigation system.

다중 기준국을 이용한 UDRE 추정기법 성능해석

  • Park, Sang-Hyeon;Seo, Gi-Yeol;Sin, Mi-Yeong
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.25-26
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    • 2011
  • 사용자 의사거리 보정 잔차(UDRE)는 위성항법보정정보의 측위성능을 예측하는데 이용하는 매우 중요한 무결성 감시정보이다. 위성항법보정정보 사용자는 위성별로 제공되는 사용자 의사거리 보정 잔차 정보를 이용하여 목표로 하는 측위성능을 보장할 수 있는지 여부를 계산하고, 이 결과를 반영하여 위성항법보강시스템의 보정정보를 사용할지 아니면, 무시할지를 판단한다. 즉, 사용자 의사거리 보정 잔차는 위성별로 제공되는 보정정보를 이용하여 보정을 한 후에도 제거되지 않고 남는 위성과 사용자 수신기 간의 통계학적 거리 오차로서 가우시안 분포를 갖는다고 본다. 따라서 동일한 위성항법신호 환경이라도 위성항법보강시스템의 종류와 응용분야별로 다르게 설정되는 측위성능의 보장 수준에 따라 사용자 의사거리 보정 잔차는 다른 값을 갖게 된다. 본 논문은 위성항법보강시스템의 무결성 감시성능에 영향을 미치는 사용자 의사거리 보정 잔차 추정기법의 성능해석을 목적으로 다중 기준국 원시정보를 이용한 사용자 의사거리 보정 잔차 추정기법 구조분석과 영향력을 소개하고, 성능에 영향을 미치는 인자와 사용자 의사거리 보정 잔차 추정성능의 지표에 대해 정의한다. 그리고 마지막으로 성능해석의 방법을 제안하고, 타당성을 검증한다.

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Availability Performance Analysis of Korean Wide Area Differential GNSS Test Bed (한국형 광역보정시스템 테스트베드 가용성 성능 분석)

  • Yun, Ho;Kee, Chang-Don;Kim, Do-Yoon
    • The Journal of Advanced Navigation Technology
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    • v.15 no.4
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    • pp.510-516
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    • 2011
  • For using Global Navigation Satellite System(GNSS) in the civil aviation, it should satisfies the Required Navigation Performances(RNPs) which are defined by International Civil Aviation Organization(ICAO). RNP defines the required accuracy, integrity, availability, continuity of each flight procedure. In order to guarantee user's integrity, user's protection level has to be overestimated. On the other hand, for improving user's availability, user's protection level has to be estimated tightly. Therefore protection level should be estimated as tight as possible while it assuring the user's integrity. This paper describes the current integrity function of Korean WAD GNSS test bed, and predicts the availability performance of Korean WAD GNSS by simulation.

Multiple-Hypothesis RAIM Algorithm with an RRAIM Concept (RRAIM 기법을 활용한 다중 가설 사용자 무결성 감시 알고리듬)

  • Yun, Ho;Kee, Changdon
    • The Journal of Advanced Navigation Technology
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    • v.16 no.4
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    • pp.593-601
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    • 2012
  • This paper develops and analyzes a new multiple-hypothesis Receiver Autonomous Integrity Monitoring (RAIM) algorithm as a candidate for future standard architecture. The proposed algorithm can handle simultaneous multiple failures as well as a single failure. It uses measurement residuals and satellite observation matrices of several consecutive epochs for Failure Detection and Exclusion (FDE). The proposed algorithm redueces the Minimum Detectable Bias (MDB) via the Relative RAIM (RRAIM) scheme. Simulation results show that the proposed algorithm can detect and filter out multiple failures in tens of meters.

A Study on Integrity Monitoring Improvement of the DGPS Reference Station (DGPS 기준국 무결성 감시 체계 고도화 방안 연구)

  • Cho, Deuk-Jae;Park, Sang-Hyun;Choi, Jin-Kyu;Suh, Sang-Hyun
    • Journal of Navigation and Port Research
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    • v.31 no.6
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    • pp.509-514
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    • 2007
  • The importance of the GPS is becoming larger and larger since it is one of the Global Navigation Satellite Systems and is regarded as a national infrastructure in the field positioning and timing Nowadays many researches avoiding and/or minimizing economic loss caused by unexpected fault of the GPS are being carried out because GPS fault can give a large impact on social security system as well as economic system NDGPS network which has been authorized by the Ministry of Marine and Fisheries provides services for marine users and evolved into a national infrastructure for GNSS users. Many researchers and engineers are doing research work in order to apply the NDGPS network to other fields. From this trend, it can be expected that the integrity and related functions for the NDGPS users will become more important than before. This paper analyzes integrity informations about the real GNSS fault and proposes method on integrity monitoring improvement of the DGPS reference station.

Method for Detection and Identification of Satellite Anomaly Based on Pseudorange (의사거리 기반 위성 이상 검출 및 식별 기법)

  • Seo, Ki-Yeol;Park, Sang-Hyun;Jang, Won-Seok;Kim, Young-Ki
    • Journal of Korean Institute of Intelligent Systems
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    • v.22 no.3
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    • pp.328-333
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    • 2012
  • Current differential GPS (DGPS) system consists of reference station (RS), integrity monitor (IM), and control station (CS). The RS computes the pseudorange corrections (PRC) and generates the RTCM messages for broadcasting. The IM receives the corrections from the RS broadcasting and verifies that the information is within tolerance. The CS performs realtime system status monitoring and control of the functional and performance parameters. The primary function of a DGPS integrity monitor is to verify the correction information and transmit feedback messages to the reference station. However, the current algorithms for integrity monitoring have the limitations of integrity monitor functions for satellite outage or anomalies. Therefore, this paper focuses on the detection and identification methods of satellite anomalies for maritime DGPS RSIM. Based on the function analysis of current DGPS RSIM, it first addresses the limitation of integrity monitoring functions for DGPS RSIM, and then proposes the detection and identification method of satellite anomalies. In addition, it simulates an actual GPS clock anomaly case using a GPS simulator to analyze the limitations of the integrity monitoring function. It presents the brief test results using the proposed methods for detection and identification of satellite anomalies.

An Analysis of the Navigation Parameters of Japanese DGNSS-MSAS (일본의 DGNSS인 MSAS 항법파라미터 분석)

  • Ko, Kwang-Soob;Choi, Chang-Mook
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.21 no.8
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    • pp.1619-1625
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    • 2017
  • Civil global navigation satellite system (GNSS) does not meet user performance requirements for specific PNT (Positioning, Navigation, and Time) applications. Therefore, various differential systems are used to augment GNSS for improving positioning accuracy and integrity. The MTSAT satellite augmentation system (MSAS) is the Japanese satellite based augmentation system. This paper is for analyzing the characteristics of Japanese MSAS in Korean peninsula. First of all, it was done for analyzing not only DGNSS navigation signal but also the navigation parameter through simulation and experimental tests. As a result of data analyses, the sufficient navigation satellites to determine 3-D position based on DGNSS are simultaneously available at MSAS monitering station and the southern region of Korean peninsula. It was verified that the carrier to noise signals are stable to maintain the reliable 3-D position and that the level of 2m (2drms) accuracy is very similar to the ordinary worldwide DGNSS as well.