• Title/Summary/Keyword: MSAS

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Analysis of MSAS Correction Information and Performance in Korea (MSAS 보정정보 분석 및 국내 적용 시 성능 평가)

  • Jeong, Myeong-Sook;Kim, Jeong-Rae
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.37 no.4
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    • pp.372-382
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    • 2009
  • A GNSS software for processing the SBAS correction data is developed, and Japan MSAS correction data is analyzed. MSAS orbit correction data is analyzed and compared with WAAS data. MSAS ionosphere correction data is analyzed and the effect of the equatorial anomaly on the correction accuracy is discussed. Degradation due to receive delay of correction information and effect of the degradation on protection level analyzed using partial remove of MSAS correction information. Integrity and availability for precision approch using the MSAS system analyzed.

Analysis of MSAS Ionosphere Correction Messages and the Effect of Equatorial Anomaly (MSAS 전리층 보정정보 및 적도변이에 의한 영향 분석)

  • Jeong, Myeong-Sook;Kim, Jeong-Rae
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.16 no.2
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    • pp.12-20
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    • 2008
  • Japanese MSAS (Multi-functional Satellite Augmentation System) satellites have been transmitting GPS satellite orbit and ionosphere correction information since 2005. MSAS coverage includes Far East Asia, and it can improve the accuracy and integrity of GPS position solutions in Korea. This research analyzed the ionosphere correction information from the MSAS ionosphere correction data. The ionosphere delay data observed by a dual frequency receiver is compared with the MSAS ionosphere correction data. The variation of MSAS GIVE values are analyzed in connection with the equatorial anomaly and ionosphere scintillation.

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Performance Analysis of BDSBAS and MSAS in Korea

  • Noh, Jae Hee;Lim, Deok Won;Lee, Ju Hyun;Jo, Gwang Hee;Lee, Sang Jeong
    • Journal of Positioning, Navigation, and Timing
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    • v.9 no.3
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    • pp.249-259
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    • 2020
  • China has deployed BDS along with the service of SBAS by 2020. Currently, the correction information for testing BDSBAS is provided through the BDS B1I signal. Many research on SBAS other than BDSBAS has been conducted in Korea. However, studies on BDSBAS are insufficient although Korea is included in both the coverage area of MSAS and BDSBAS. Therefore, it is necessary to continuously analyze the performance of MSAS and BDSBAS. In this paper, the performance of MSAS and BDSBAS in Korea, China, and Japan is analyzed in the aspect of positioning accuracy using the GNSS RINEX data provided by IGS. A Software platform is designed to analyze the performance of GPS-only, BDS-only, GPS/MSAS and BDS/BDSBAS. From the result, it can be concluded that the accuracy enhancement can be hardly seen when using the correction information of MSAS and BDSBAS in Korea

An Analysis of the Signal Properties of Japanese MSAS (일본의 MSAS 특성 분석)

  • Choi, Chang-Mook;Ko, Kwang-Soob
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2016.10a
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    • pp.946-947
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    • 2016
  • This paper is for analyzing not only DGNSS navigation signal but also the navigation parameter of MSAS. The sufficient navigation satellites to determine 3-D position based on DGNSS are simultaneously available at MSAS monitering station and the test region of Korean peninsula. It was verified that the carrier to noise signal is stable to maintain the reliable positioning.

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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.

Investigation on Availability of MSAS Signal around Korean Peninsula (한반도에서의 MSAS 신호 사용 검토)

  • Ko, Kwangsoob
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2016.05a
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    • pp.771-772
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    • 2016
  • The paper is the basic study on the investigation that MSAS system can be usable around Korean Peninsula. The general issues of DGNSS were mostly investigated referred to previous published materials. And it is verified that the sufficient GPS satellites, which are more than 4 satellites, for positioning using MSAS service are available around Korean Peninsula.

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Comparison Analysis of Positioning Performance between NDGPS and MSAS (NDGPS 와 MSAS 성능 비교분석)

  • Park, Sang-Hyun;Cho, Deuk-Jae;Suh, Sang-Hyun
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2007.12a
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    • pp.87-89
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    • 2007
  • 우리나라에서는 1995년 5월 서해권 DGPS 보정정보 전송 서비스를 시작으로 NDGPS 기준국망 구축을 완료하고, 선박의 안전한 항행을 위해 실시간 DGPS 보정정보를 국내 연안과 도서지역에 송신하고 있다. 본 논문에서는 NDGPS와 유사한 보정정보 서비스로서 우리나라에서도 수신이 가능한 일본의 위성기반 보정위성항법체계인 MSAS와 현재 우리나라에서 VHF 대역으로 서비스하고 있는 NDGPS 의 성능을 항해장비 이용 관점에서 비교분석한다. 이를 위해 본 논문은 NDGPS 기준국과 이용자 사이의 기저거리를 기준으로 보정정보 도달시간과 수평측위 정확도를 측정한다. 그리고, NDGPS 와 MSAS 간의 성능차이와 항해장비용 보정시스템으로서 MSAS 적용 가능성에 대한 분석결과를 보인다.

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Analysis of Horizontal Positioning for WADGPS using MTSAT (MTSAT를 이용한 WADGPS의 수평위치 해석)

  • Yeu, Hoon;Kim, Jeok-Kyo;Lim, Soo-Bong;Lee, Yong-Wook
    • Journal of Korean Society for Geospatial Information Science
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    • v.14 no.3 s.37
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    • pp.71-77
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    • 2006
  • MSAS satellite is the geostationary satellite for realizing WADGPS that can get the position of moving object in a wide area receiving the correction signal created from a ground using satellite. In this study, we analyzed two different data. One is using the correction signal transmitted from MTSAT-2 satellite of MSAS and the other is receiving the data of DGPS using BEACON receiver. As we compared both data, we could get the conclusion that the position accuracy of both data is also can get up to the standard or the conventional real-time code DGPS. As a result, we can expect that if we use MTSAT-2 satellite and BEACON receiver together, we can apply them LBS part that require real-time data or the obtaining geospatial information that does not require high accuracy much regardless of topography.

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Development of the Maternal Separation Anxiety Scale (어머니의 격리불안 척도의 개발)

  • Cho, Bok Hee;Park, Sung Ok
    • Korean Journal of Child Studies
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    • v.13 no.1
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    • pp.16-37
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    • 1992
  • The purpose of this study was the development of a scale to assess maternal anxiety after mother-child separation. Subjects consisted of 384 mothers who had children from 6 to .36 months of age. A questionnaire consisting of eighty Likert-type items and Spielberger's(1970) State Anxiety Scale were administered to mothers and data were analyzed using item analysis. factor analysis. multiple regression. Cronbach's ${\alpha}$. Pearson's correlation and F-test. Sixty of the eighty items were significant and deemed acceptible through item discrimination method with indices ranging from. 32 to .95. Factor analytic procedures have selected 54 items of the 60-item scale and supported a 5-factor solution. The subscales labeled 'Maternal Separation Anxiety'. 'Perception of Separation Effects on the Child', 'Desire for Physical Cuddling and Closeness'. 'Attitudes toward the Value or Importance of Exclusive Maternal Care' and 'Employment-related Separation Concerns,' Finally. a multiple regression analysis conducted to reduce the length of the scale yielded a 39-item form for the Maternal Separation Anxiety Scale(MSAS). Internal consistency of the MSAS was high(Cronbach's ${\alpha}$ =.85). The correlation of the MSAS with the Spielberger's State Anxiety measure yielded a coefficient of .36, revealing a moderate and positive relationship.

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Analysis of City Size Distribution and Spatial Structure - with Korean Metroplitan Statistical Areas (MSA) (한국 도시의 규모분포와 도시공간구조 분석 - 광역도시통계권을 중심으로)

  • Kim, Dong-Soo;Huh, Mun-Gu;Lee, Doo-Hee
    • Journal of the Economic Geographical Society of Korea
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    • v.11 no.4
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    • pp.549-563
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    • 2008
  • The purpose of this research is to identify the urban structure in Korea. Though there is research regarding urbanization, there is little regarding the urban structure of the Korean economy. In this paper, two issues will be discussed: the measurements of inter-city and intra-city structure in Korean Metropolitan Statistical Areas (MSAs), which is newly defined. First, the city size rank rule, widely known as Zipf’s Law, will illustrate Korean the inter-city structure. The city size rank rule gives an idea whether Korean MSAs are balanced or not. In general, Korea has a heavy concentration in the Seoul MSA in terms of population. It could be either that the Seoul MSA is too big or that the Busan MSA is too small or both. If this is the primacy problem, a decentralization policy is necessary. On the other hand, if it is a second city problem, development policies for the Busan MSA and Daegu MSA are more important. Next, the Korean intra-city structure will be discussed. The evolutions of the MSAs explain intra-city structure by analyzing population density function and the housing price function. Some large MSAs such as Seoul and Busan have experienced urban sprawl, while other MSAs have experienced urban concentration. The population density gradient by the distance from the ARC GIS shows the growth rate of a city. According to the Spatial Mismatch Index between population and employment, the Ulsan MSA, Gwangju MSA, and Suwon-Hwaseong-Osan MSA are more mismatched, while the Daejeon MSA and Incheon MSA are less mismatched. Therefore, these analyses of Korean urban structure are meaningful in developing regional policy.

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