• Journal of Positioning, Navigation, and Timing
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• 제13권1호
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• pp.75-83
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• 2024

In order to reduce the time and cost of developing a navigation system, a performance evaluation platform can be used. A User Interface (UI) is required to effectively evaluate the performance, which sets parameters and gives navigation sensor signals and data display, and also displays navigation results. In this paper, a LabVIEW-based UI design method for multi-integrated navigation systems is proposed and implementation results are presented. The UI consists of a signal and data generation part and a signal and data processing part. The signal and data generation part sets parameters for the signal and data generation and displays the navigation sensor signal and data generation results. The signal and data processing part sets parameters for the signal and data processing and displays the navigation results. The signal and data generation part and signal and data processing part are designed to satisfy the requirements of the UI for a performance evaluation of the navigation system. In order to show the usefulness of the proposed UI design method, parameters of the signal and data generation and the signal and data processing are set through the LabVIEW-based UI, and the Global Positioning System (GPS) signal and inertial measurement unit data generation results and the navigation results of a GPS Software Defined Receiver (SDR) and inertial navigation system are confirmed. The implementation results show that the proposed UI design method helps users conduct an effective performance evaluation of navigation systems.

• 한국정보전자통신기술학회논문지
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• 제12권1호
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• pp.49-57
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• 2019

국제해사기구(IMO)는 해상을 항해하는 선박에 대해, 해상사고의 인적요인이 발생하지 않도록 e-Navigation이라는 새로운 해상안전 지원체계를 개발하고 도입하려 하고 있다. 한국은 e-Navigation 개발에 적극적으로 참여하여 e-Navigation 에 자체적으로 개발한 개념을 더해 한국형 e-Navigation인 '차세대 해양안전종합관리체계 기술'을 개발하고 있으며 2019년 도입을 목표로 하고 있다. 한국형 e-Navigation은 해양안전을 위한 다양한 기능을 제공할 수 있도록 설계되고 있는 만큼 각 기능별로 필요한 데이터의 종류가 공간 데이터와 일반 데이터, 파일, 기상 그리드등 다양하다. 따라서 이들 데이터를 eNavigation의 각 기능 서비스 시스템에 적절히 제공할 수 있는 시스템이 필요하게 되었다. 이에 본 논문에서는 한국형 e-Navigation에서 필요로 하는 데이터를 분석하고 이러한 이종 데이터를 제공할 수 있도록 REST API를 이용한 이종 데이터 서비스 시스템의 아키텍처를 설계하였다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2019년도 춘계학술대회
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• pp.12-13
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• 2019

해사 빅데이터 연계체계는 한국형 e-Navigation에서 활용하는 해사관련 내 외부 데이터 연계를 위한 시스템이다. 내 외부에서 발생하는 해사 데이터들의 기술별 데이터 획득, 변환, 보관, 분석, 관리 응용 서비스를 생성할 수 있으며, 컴포넌트 단위로 구성하여 처리할 수 있다. 또한, 워크플로우로 정의된 데이터들의 흐름을 모니터링 할 수 있다. 본 연구를 통해 추후 e-Navigation 서비스에서 보다 효율적이고 손쉽게 데이터를 연계할 수 있을 것으로 기대한다.

• 한국항해항만학회지
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• 제42권2호
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• pp.79-86
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• 2018

Common Maritime Data Structure (CMDS) is commonly used by shore and ship users in e-Navigation data domain. In the overarching of e-Navigation architecture, IHO uses S-1XX, a digital exchange standard for next-generation marine information, as data exchange standard. The current CMDS has the advantage of intuitively recognizing the overall structure of e-Navigation. However, it has disadvantage in that it does not allow stakeholders to easily understand benefits that e-Navigation can provide when implementing e-Navigation. In this study, the direction of improving existing system for effective e-Navigation implementation was proposed considering RCOs (Risk Control Options) with expected composition of ship/ shore/ communication system by sector.

• 제어로봇시스템학회논문지
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• 제9권3호
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• pp.242-250
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• 2003

We propose the monitoring system scheme for the CPS/INS integrated navigation system. The design requirements of the monitoring system are suggested and the software scheme based on GUI is proposed. The proposed monitoring system consists of an I/O interface part, a navigation data display part, and a post-processing part. The I/O interface part is responsible for data communication between the monitoring system and a navigation computer unit. The navigation data display part provides various display methods to show the navigation data to user in real-time. The post-processing part collects the navigation data to analyze the performance of navigation system. The proposed monitoring system software was developed using the Visual C++ programming language and a van test was carried out to demonstrate the real-time operation of the monitoring system. The test result shows that the proposed monitoring system can be effectively applied to the CPS/INS integrated navigation system.

• ETRI Journal
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• 제33권4호
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• pp.476-486
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• 2011

The quality of navigation service is determined by the accuracy of the available data. For existing navigation services, a full map update is provided in order to keep the map data of mobile devices current. As content and services of mobile devices have recently been diversifying, the size of map data managed in mobile devices has increased, reaching several gigabytes in size. It generally takes tens of minutes to write several gigabytes of data into mobile device storage. For traditional navigation systems, a complicated storage structure called a physical storage format (PSF) is used to assure maximum processing performance of map data in mobile devices within limited resources. Consequently, even though modified navigation map data actually affects only a portion of a map, the full map data is updated because partial updates are not possible. In this paper, a navigation system is studied to solve this difficult partial map update problem. The map air update navigation system, which is the result of this study, provides real-time partial map updating using wireless communications.

• Journal of Positioning, Navigation, and Timing
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• 제9권3호
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• pp.273-284
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• 2020

The performance of Global Navigation Satellite System (GNSS) chipset and Inertial Measurement Unit (IMU) sensors embedded in smartphones for location-based services (LBS) is limited due to the economic reasons for their mass production. Therefore, it is necessary to efficiently process the output data of the smartphone's embedded sensors in order to derive the optimum navigation values and, as a previous step, output performance of smartphone embedded sensors needs to be verified. This paper analyzes the navigation performance of such devices by processing the raw measurements data output from smartphones. For this, up-to-dated versions of smartphones provided by Samsung (Galaxy s10e) and Xiaomi (Mi 8) are used in the test experiment to compare their performances and characteristics. The GNSS and IMU data are extracted and saved by using an open market application software (Geo++ RINEX Logger & Mobile MATLAB), and then analyzed in post-processing manner. For GNSS chipset, data is extracted from static environments and verified the position, Carrier-to-Noise (C/N₀), Radio Frequency Interference (RFI) performance. For IMU sensor, the validity of navigation and various location-based-services is predicted by extracting, storing and analyzing data in static and dynamic environments.

• Journal of Astronomy and Space Sciences
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• 제35권4호
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• pp.287-293
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• 2018

This paper presents a satellite relative navigation strategy for formation flying, which chooses an appropriate navigation algorithm according to the operating environment. Not only global positioning system (GPS) measurements, but laser measurements can also be utilized to determine the relative positions of satellites. Laser data is used solely or together with GPS measurements. Numerical simulations were conducted to compare the relative navigation algorithm using only laser data and laser data combined with GPS data. If an accurate direction of laser pointing is estimated, the relative position of satellites can be determined using only laser measurements. If not, the combined algorithm has better performance, and is irrelevant to the precision of the relative angle data between two satellites in spherical coordinates. Within 10 km relative distance between satellites, relative navigation using double difference GPS data makes more precise relative position estimation results. If the simulation results are applied to the relative navigation strategy, the proper algorithm can be chosen, and the relative position of satellites can be estimated precisely in changing mission environments.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2017년도 춘계학술대회
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• pp.263-266
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• 2017

육상에 비해 위험도가 높은 해상에서의 항해를 지원하기 위해 수많은 해상안전기술 및 체계가 개발되고 있다. e-Navigation은 해상안전을 위한 대표적인 체계로, 현존하는 대부분의 해상안전기술을 집약시켜 선박 안전 지원을 극대화할 수 있도록 개발되고 있다. 이 e-Navigation 체계는 국제해사기구(IMO)에서 2019년까지 도입을 목표로 개발을 진행하고 있으며, 한국은 해상안전지원기술의 중요성을 이미 인식하여 e-Navigation을 적극도입하고 있다. 한국형 e-Navigation은 최적안전항로 제공, 위험도 분석, 기상 정보 제공등 해상안전을 위한 다양한 기능을 제공하도록 설계가 진행되고 있으며 각 기능을 제공하는 서비스 모듈은 하나의 데이터베이스로 구성하기 힘든 각기 다른 종류의 데이터를 사용한다. 이에 본 논문에서는 한국형 e-Navigation 운영 시스템에서 필요로 하는 데이터를 분석하고 이를 효과적으로 지원할 수 있는 데이터 서비스 시스템 구조와 종류를 분석하였다.

• 한국항해항만학회지
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• 제38권3호
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• pp.203-209
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• 2014

As a sense of practical field, most researchers emphasize the importance of safety management to prevent marine accidents. The purpose of this paper is to develope a new safety evaluation method using Safety Index (SI) which is to measure the emotional feeling of navigation officer by traffic situations. In this study, the questionnaires with SI are used to investigate the degree of sensing levels of navigation officers according to the navigation situations. In addition, the traffic data obtained from AIS (Automatic Identification System) data are used to give actual situations in the questionnaire investigation. As results of questionaries investigations based upon the AIS data, it is shown that the Safety Index can be used as a criterion to determine the safety levels of ship navigating in a coastal areas.