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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Journal of Advanced Navigation Technology
Journal Basic Information
Journal DOI :
The Korea Navigation Institute
Editor in Chief :
Volume & Issues
Volume 19, Issue 6 - Dec 2015
Volume 19, Issue 5 - Oct 2015
Volume 19, Issue 4 - Aug 2015
Volume 19, Issue 3 - Jun 2015
Volume 19, Issue 2 - Apr 2015
Volume 19, Issue 1 - Feb 2015
Selecting the target year
Detection Performance Comparison of ADS-B and TCAS Using Simulation
So, Jun-Soo ; KU, SungKwan ; Hong, Gyo-young ;
The Journal of Advanced Navigation Technology, volume 19, issue 6, 2015, Pages 465~472
DOI : 10.12673/jant.2015.19.6.465
In order to improve the performance of TCAS it should improve the performance of the sensor, which transmits a variety of information. In this paper, To improve the performance of the existing radar sensors such as being used in behalf of the next generation air traffic control system, ads-b the applied. In addition, ADS-B in a high precision by using information from the correction GPS system, SBAS assume would be able to apply an improved location accuracy for TCAS and analyzed TCAS and ADS-B. Played the simulation results, TCAS equipment receives the help of these ADS-B can calculate a CPA to determine the position of the aircraft in advance, and it was confirmed that it is possible to reduce the unnecessary RA operation, also, the pilot reduction and the workload, it has advantages such as fuel consumption and time associated with the reduced operation unnecessary RA was confirmed.
Application of SIMC Based Quad-rotor Cascade Control by Using 1-axis Attitude Control Test-bench
Choi, Yun-sung ; You, Young-jin ; Jeong, Jin-seok ; Kang, Beom-soo ;
The Journal of Advanced Navigation Technology, volume 19, issue 6, 2015, Pages 473~483
DOI : 10.12673/jant.2015.19.6.473
This paper reports the single-input-single-output cascade control by using 1-axis attitude control test-bench for quad-rotor UAV. The test-bench was designed as a see-saw shape using 2 motors and propellers, and to enable changing the center of gravity with the center of gyration using ballast. The experiment was carried out by constructing a PID-PID controller having a cascade structure with the test-bench. The SIMC based PID gain tuning process, which makes PID gain tuning easy, was grafted to cascade control. To graft SIMC method, the system parameter estimation result was conducted with second order time delay model by using Matlab-Simulink. Gain tuning was conducted by simulating with estimated system parameter. In this paper, the conventional application of SIMC was conducted and improved application was proposed for improving stability at tuning process.
Aerial Scene Labeling Based on Convolutional Neural Networks
Na, Jong-Pil ; Hwang, Seung-Jun ; Park, Seung-Je ; Baek, Joong-Hwan ;
The Journal of Advanced Navigation Technology, volume 19, issue 6, 2015, Pages 484~491
DOI : 10.12673/jant.2015.19.6.484
Aerial scene is greatly increased by the introduction and supply of the image due to the growth of digital optical imaging technology and development of the UAV. It has been used as the extraction of ground properties, classification, change detection, image fusion and mapping based on the aerial image. In particular, in the image analysis and utilization of deep learning algorithm it has shown a new paradigm to overcome the limitation of the field of pattern recognition. This paper presents the possibility to apply a more wide range and various fields through the segmentation and classification of aerial scene based on the Deep learning(ConvNet). We build 4-classes image database consists of Road, Building, Yard, Forest total 3000. Each of the classes has a certain pattern, the results with feature vector map come out differently. Our system consists of feature extraction, classification and training. Feature extraction is built up of two layers based on ConvNet. And then, it is classified by using the Multilayer perceptron and Logistic regression, the algorithm as a classification process.
Integrated Air Traffic Simulations of Manned and Remotely Piloted Aircraft
Oh, Hyeju ; Park, Bae-Seon ; Choi, Keeyoung ; Lee, Hak-Tae ; Jung, Hyun-Tae ; Moon, Woo-Choon ;
The Journal of Advanced Navigation Technology, volume 19, issue 6, 2015, Pages 492~498
DOI : 10.12673/jant.2015.19.6.492
With the rapid growth of technologies and demand of remotely piloted aircraft systems (RPASs), integration of such systems into the existing airspace is becoming an issue in many countries. To assess the impact of integrated operations of manned and remotely piloted aircraft (RPA), it is necessary to perform Human-in-The-Loop (HiTL) simulations of likely situations with an integrated simulation system. This paper defines several operational concepts for the integrated simulation. Several probable scenarios were developed including a traffic pattern at a small airport and an altitude maneuver at a route crossing. HiTL simulations were performed according to the developed scenarios. The simulation results are analyzed focusing on the impacts of different communication, safety, performance, and human machine interface (HMI) characteristics of RPA.
Regional Alternative Navigation Using HALE UAV, Pseudolite & Transceiver
Choi, Min-woo ; Yu, Sun-Kyoung ; Kim, O-Jong ; Kee, Chang-Don ; Park, Byung-Woon ; Seo, Seung-Woo ; Park, Jun-Pyo ;
The Journal of Advanced Navigation Technology, volume 19, issue 6, 2015, Pages 499~506
DOI : 10.12673/jant.2015.19.6.499
Global navigation satellite systems (GNSS) is operating widely in civil and military area. GNSS signals, however, can be easily interfered because its signal is vulnerable to jamming. Thus, a sort of backup or alternative system is needed in order that the navigation performance is assured to a certain degree in case of GNSS jamming. In order to suggest a series of backup or alternative system of regional navigation, in this paper, we introduced a high altitude long endurance unmanned aerial vehicle (HALE UAV) with pseudolites using inverted GPS and transceiver system. We simulated the positioning error of the regional navigation system using HALE UAV with inverted GPS or transceivers concepts. We estimated the position error of HALE UAV calculate user position errors based on the position error of HALE UAV and general pseudorange error.
Analysis of Positioning Accuracy Using LX GNSS Network RTK
Ha, Jihyun ; Kim, Hyun-ho ; Jung, Wan-seok ;
The Journal of Advanced Navigation Technology, volume 19, issue 6, 2015, Pages 507~514
DOI : 10.12673/jant.2015.19.6.507
The Spatial information research institute of the LX Korea land and geospatial informatix corporation manages infrastructure for the LX global navigation satellite system (GNSS), which comprises 30 monitoring stations nationwide. Since 2014, it has conducted network real-time kinematic (RTK) tests using the master-auxiliary concept (MAC). This study introduces the infrastructure of LX GNSS and presents the results of a performance analysis of the LX RTK service. The analysis was based on a total of 25 cadastral topographic control points in Jeonju, Seoul, and Incheon. For each point, performance was measured over one observation, two repeated observations, and five repeated observations. The measurements obtained from LX MAC and the VRS of the National Geographic Information Institute were compared with the announced coordinates derived from cadastral topographic control points. As a result, the two systems were found to have similar performance with average error and standard deviation differing only by 1 to 2 cm.
Design and Implementation of Multi-Sensor Interface System
Mun, Myeong-Ju ; Kim, Hyounkyoung ;
The Journal of Advanced Navigation Technology, volume 19, issue 6, 2015, Pages 515~523
DOI : 10.12673/jant.2015.19.6.515
The air traffic control service in the domestic airports and approach control centers is provided using data from flight plan and a variety of surveillance sensors such as SSR, ADS-B and MLAT, etc. The physical connection methods and data types of the sensors are various, as so using these data directly may cause a lot of cost in development and maintenance of air traffic control equipment. As a method for solving such a problem, we propose a system that can convert the data from the heterogeneous sensors to the unified format which can be processed by the air traffic control devices. In this paper, the analysis results for the physical characteristics and data formats of the typical surveillance sensors are described. Also, the system design and the system implementation result for the multi-sensor interface system to interoperate the sensors are explained in detail.
Installation and Operation of a GPS Jammer Localization System
Lim, Deok Won ; Lim, Soon ; Chun, Sebum ; Heo, Moon Beom ;
The Journal of Advanced Navigation Technology, volume 19, issue 6, 2015, Pages 524~533
DOI : 10.12673/jant.2015.19.6.524
In this paper, results for an installation and operation of a GPS jammer localization system were analyzed. The jammer localization system was developed by Korea Aerospace Research Institute and it consists of 4 Receiver Stations, a Central Tracking Station, and a Monitoring Station. The system was installed at Incheon International Airport in November 2014; each Receiver Stations were installed at rooftop of buildings apart from 4km, and the Central Tracking Station and a Monitoring Station were installed at indoor. Results of the operation can be monitored through web-browser in real-time, Korea Aerospace Research Institute and Incheon International Airport Corporation are continuously monitoring them. So far, there is no jamming signal which affects GPS receivers around the airport, however, some abnormal signals were frequently received at Receiver Stations. Therefore, the characteristics of those signals were also analyzed in this paper.
A Feasibility Study on Multiple DME Positioning Considering Time-Misaligned Range Measurements
Choi, Kwang-Ho ; Lim, Joon-Hoo ; Yoo, Won-Jae ; So, Hyoungmin ; Lee, Hyung-Keun ;
The Journal of Advanced Navigation Technology, volume 19, issue 6, 2015, Pages 534~543
DOI : 10.12673/jant.2015.19.6.534
This paper introduces the time-misalignment error between multiple range measurements acquired by an onboard distance measuring equipment (DME) interrogator and proposes an efficient position determination method that can mitigate the negative effects of the time-misalignment error. The introduced time-misalignment error does not occur in conventional utilization of DME combined with VHF omnidirectional range (VOR). The proposed position determination method projects all the DME range measurements acquired irregularly during an interval to the same time instance where the aircraft position is determined. By the simulation utilizing a representative aircraft trajectory, it is shown that it is possible to estimate the horizontal position accurately without any changes of ground DME facilities.
Design and Implementation of Optical Flow Estimator for Moving Object Detection in Advanced Driver Assistance System
Yoon, Kyung-Han ; Jung, Yong-Chul ; Cho, Jae-Chan ; Jung, Yunho ;
The Journal of Advanced Navigation Technology, volume 19, issue 6, 2015, Pages 544~551
DOI : 10.12673/jant.2015.19.6.544
In this paper, the design and implementation results of the optical flow estimator (OFE) for moving object detection (MOD) in advanced driver assistance system (ADAS). In the proposed design, Brox`s algorithm with global optimization is considered, which shows the high performance in the vehicle environment. In addition, Cholesky factorization is applied to solve Euler-Lagrange equation in Brox`s algorithm. Also, shift register bank is incorporated to reduce memory access rate. The proposed optical flow estimator was designed with Verilog-HDL, and FPGA board was used for the real-time verification. Implementation results show that the proposed optical flow estimator includes the logic slices of 40.4K, 155 DSP48s, and block memory of 11,290Kbits.
Beacon Signal Strength Analysis for Efficient Indoor Positioning
Hwang, Hyun-seo ; Park, Jin-tae ; Yun, Jun-soo ; Phyo, Gyung-soo ; Moon, Il-young ; Lee, Jong-sung ;
The Journal of Advanced Navigation Technology, volume 19, issue 6, 2015, Pages 552~557
DOI : 10.12673/jant.2015.19.6.552
Recent performed by recognizing a user`s location, various services have been tailored focus on short-range wireless communication technology. A beacon in which is attracting attention as next-generation technology. Beacon is a terminal by utilizing the frequency of the non-audible area can not be bluetooth and human sending and receiving terminals and information, Apple recently iBeacon like a low-power Bluetooth (BLE; bluetooth low energy) based beacon showing a tendency to rise into the mainstream there. Services using a beacon is basically installs the terminal in a certain place indoor. It is characterized by providing the user the services to catch the user`s position, even automatically take a separate action. Various types of location-based service provided by the target interior space began to attract attention. A variety of location-based services are provided in the interior space in order to be successfully deployed and provide guidance to the interior space, the movement route and the like are essentially required to build various types of information. In this paper, for efficient indoor positioning by varying the signal strength of the beacon in such areas were measured and analyzed.
Location Estimation Algorithm Based on AOA Using a RSSI Difference in Indoor Environment
Jung, Young-Jin ; Jeon, Min-Ho ; Ahn, Jeong-Kil ; Lee, Jung-Hoon ; Oh, Chang-Heon ;
The Journal of Advanced Navigation Technology, volume 19, issue 6, 2015, Pages 558~563
DOI : 10.12673/jant.2015.19.6.558
There have recently been various services that use indoor location estimation technologies. Representative methods of location estimation include fingerprinting and triangulation, but they lack accuracy. Various kinds of research which apply existing location estimation methods like AOA, TOA, and TDOA are being done to solve this problem. In this paper, we study the location estimation algorithm based on AOA using a RSSI difference in indoor environments. We assume that there is a single AP with four antennas, and estimate the angle of arrival based on the RSSI value to apply the AOA algorithm. To compensate for RSSI, we use a recursive averaging filter, and use the corrected RSSI and the Pythagorean theorem to estimate the angle of arrival. The results of the experiment, show an error of 18% because of the radiation pattern of the four non-directional antennas arranged at narrow intervals.
Wi-Fi Based Indoor Positioning System Using Hybrid Algorithm
Shin, Geon-Sik ; Shin, Yong-Hyeon ;
The Journal of Advanced Navigation Technology, volume 19, issue 6, 2015, Pages 564~573
DOI : 10.12673/jant.2015.19.6.564
GPS is the representative positioning technology for providing the location information. This technique has the disadvantage that does not operate in the shadow areas, such as urban or dense forest and the interior. This paper proposes a hybrid indoor positioning algorithm, which estimates a more accurate location of the terminal using strength of the Wi-Fi signal from the indoor AP. To determine the location of the user, we establish the most appropriate path loss model for the measurement environment. by using the RSSI value measured in a variety of environment such as building structure, person, distance, etc. The path loss exponent obtained by the path loss model is changed according to the environment. REKF, PF estimate the position of the terminal by using measured value from the AP with path loss exponent. For more accurate position estimation, we select positioning system by the value of threshold measured by experiments rather than a single positioning system. Experimental results using the proposed hybrid algorithm show that the performance is improved by about 17% than the conventional single positioning method.
Stability Condition for Discrete Interval System with Time-Varying Delay Time
Han, Hyung-seok ;
The Journal of Advanced Navigation Technology, volume 19, issue 6, 2015, Pages 574~580
DOI : 10.12673/jant.2015.19.6.574
The stability condition of linear discrete interval systems with a time-varying delay time is considered. The considered system has interval system matrices for both non-delayed and delayed states with time-varying delay time within given interval values. The proposed condition is derived by using Lyapunov stability theory and expressed by very simple inequality. Compared to previous results, the stability issue on the interval systems is expanded to time-varying delay. Furthermore, the new condition can imply the existing results on the time-invariant case and show the relation between interval time-varying delay time and stability of the system. The proposed condition can be applied to find the stability bound of the discrete interval system. Some numerical examples are given to show the effectiveness of the new condition and comparisons with the previously reported results are also presented.
Design of Embedded Based Distributed RFID Gateway Using Open Source Hardware
Jeon, Jun-Cheol ;
The Journal of Advanced Navigation Technology, volume 19, issue 6, 2015, Pages 581~586
DOI : 10.12673/jant.2015.19.6.581
In this paper, we configure a Radio Frequency IDentification (RFID) gateway using an arduino and raspberry pi which are recent issues with a representative open source hardware. RFID technology is emerging as a key technology in a variety of environments as a technique to automatically identify objects using a radio frequency signal. In this paper, we propose a distributed RFID gateway for providing various communication methods and processing a large amount of RFID tag information efficiently, and to increase the scalability and middleware communication efficiency of the RFID reader. Existing RFID middleware systems have the problems that they should adhere the web service for interworking with a reader and the communication standard. Therefore, in this paper, we comprise our RFID gate to satisfy not only the serial communication configuration but also various digital signal processing standard so that it increases the communication efficiency of the middleware system.
Management and Security of User in Linux Server
Jung, Sung-Jae ; Sung, Kyung ;
The Journal of Advanced Navigation Technology, volume 19, issue 6, 2015, Pages 587~594
DOI : 10.12673/jant.2015.19.6.587
Open operating system, Linux is the traditional Web, E-mail, DNS, FTP server, as well as being used in Cloud and Big data infrastructure. In addition, Linux is also used like a desktop or mobile devices, smart TV and cars. In particular, stepping up to the IoT era at this time is expected to be greater proportion occupied by Linux. As the use of Linux has increased security has emerged as an important factor. User management is core of Linux system security. In this paper, Classifying Linux user and analyzed the role of the user-specific file. Finally, we analyzed the linux management technologies and useful user security tools.
Compensation for the Distorted WDM Channels through the Dispersion-managed Optical Links with Non-midway Optical Phase Conjugator
Lee, Seong-Real ;
The Journal of Advanced Navigation Technology, volume 19, issue 6, 2015, Pages 595~600
DOI : 10.12673/jant.2015.19.6.595
The implementation possibility of the flexible optical network configuration using the non-midway optical phase conjugator (OPC) in the dispersion-managed (DM) optical link for wavelength division multiplexed (WDM) transmission is demonstrated in this paper. It is confirmed that the implementation possibility of flexible link configuration is more increased, as number of fiber spans is more bigger and the residual dispersion per span (RDPS) is more large. It is also confirmed that the non-midway OPC link, in which RDPS of the latter half transmission section (after OPC) is decided by the averaged RDPS of the former half transmission section (before OPC), has more advantage for the flexible network configuration.
Wireless Network Connection Method for Seamless Data Service
Roh, Jae-Sung ; Kim, Wan-Tae ;
The Journal of Advanced Navigation Technology, volume 19, issue 6, 2015, Pages 601~606
DOI : 10.12673/jant.2015.19.6.601
Recently wireless data services have widely spread on various multimedia devices such as smart phones and tablets. Existing wired data services have been replaced by wireless data services using mobile devices. Especially domestic mobile devices supporting both Wireless-Fidelity (Wi-Fi) and long term evolution (LTE) services have increased steadily. While Wi-Fi network is provided free of charge, LTE network is offered to pay for. Therefore, mobile devices provide smart network switch to support both preferred Wi-Fi and LTE networks. However, such handover and roaming between Wi-Fi and LTE networks can cause data connection stop in spite of charged data services. This paper has proposed the method to overcome data connection stop for guaranteeing seamless data service during handover and roaming procedures between networks.
Analysis on the Path Length of M/W Access Link for Mobile Backhaul Design
Kang, Young-Heung ;
The Journal of Advanced Navigation Technology, volume 19, issue 6, 2015, Pages 607~613
DOI : 10.12673/jant.2015.19.6.607
In order to design M/W(microwave) short backhaul above 10 GHz to meet the increase in mobile traffic demand, the rain attenuation as well as the atmospheric conditions such as Earth bulge and Fresnel zone should be considered. In this paper, the path lengths have been estimated theoretically in various frequency bands using the Korean standard rain rate, and an example of path profile has been analyzed in urban area utilizing spectrum management intelligence system (SMIS). These derived minimum path lengths in various frequency bands are compared to the foreign them, and then will be proposed to improve the Korean minimum path length unitized to 10 km. This paper will provide useful information for microwave engineers in designing a M/W access link, and be utilized to make an efficient usage of high frequency bands for the short mobile broadband backhaul.
Performance Improvement of Binary MQ Arithmetic Coder
Ko, Hyung Hwa ; Seo, Seok Yong ;
The Journal of Advanced Navigation Technology, volume 19, issue 6, 2015, Pages 614~622
DOI : 10.12673/jant.2015.19.6.614
Binary MQ arithmetic coding is widely used recently as a basic entropy coder in multimedia coding system. MQ coder esteems high in compression efficiency to be used in JBIG2 and JPEG2000. The importance of arithmetic coding is increasing after it is adopted as an unique entropy coder in HEVC standard. In the binary MQ coder, arithmetic approximation without multiplication is used in the process of recursive subdivision of range interval. Because of the MPS/LPS exchange activity happened in MQ coder, output byte tends to increase. This paper proposes an enhanced binary MQ arithmetic coder to make use of a lookup table for AQe using quantization skill in order to reduce the deficiency. Experimental results show that about 4% improvement of compression in case of JBIG2 for bi-level image compression standard. And also, about 1% improvement of compression ratio is obtained in case of lossless JPEG2000 coding. For the lossy JPEG2000 coding, about 1% improvement of PSNR at the same compression ratio. Additionally, computational complexity is not increasing.
Design of CPW-Fed Printed Monopole Antenna for CDMA/WLAN
Nam, Ju-Yeol ; Song, Won-Ho ; Lee, Young-soon ;
The Journal of Advanced Navigation Technology, volume 19, issue 6, 2015, Pages 623~629
DOI : 10.12673/jant.2015.19.6.623
In the present study, a coplanar waveguide (CPW)-fed printed monopole antenna with an inverted n-shaped slot is newly proposed for dual band operations which cover bandwidths of CDMA (1.85~2.025 GHz) and WLAN (2.4~2.484 GHz) as well as implementation of omnidirectional radiation pattern. For enhancement of impedance bandwidth (
) in 2.4 GHz WLAN frequency band, an inverted n-shaped slot instead of the previous n-shaped slot is etched on the printed radiating monopole. The proposed antenna is designed and fabricated on one side of FR4 substrate with dielectric constant of 4.4, thickness of 1.6 mm, and size of
. It has been observed that the measured impedance bandwidths are 280 MHz (1.84~2.12 GHz) in frequency band of CDMA and 420 MHz (2.38~2.8 GHz) in WLAN frequency band respectively. It is noticeable that impedance bandwidth in 2.4 GHz frequency band of WLAN is enlarged to three times due to use of inverted L-shaped slot in comparison with impedance bandwidth 140 MHz (2.39~2.53 GHz) obtained by use of the previous n-shaped slot. In addition, good omnidirectional radiation patterns have been observed over the entire frequency band of interest.
A Service Coverage Analysis for the Digital Radio Village Broadcasting Systems
Choi, Da-Some ; Kang, Young-Heung ;
The Journal of Advanced Navigation Technology, volume 19, issue 6, 2015, Pages 630~635
DOI : 10.12673/jant.2015.19.6.630
Since, the existing analog village broadcasting system had been affected by the climate change such as rain and had some problems likes as short range, it had been changed to the digital system and its standardizations required to be developed from now. In order to deploy the efficient digital wireless village broadcasting system, some propagation profiles as well as service coverages should be analyzed in various radio environments. In this paper, we have set up the transmission power as a parameter and estimated the service coverage area ratio as well as the area ratio interfered into the nearby village in rural, suburban and urban environments using spectrum management intelligence system (SMIS). This paper provides the basic data to establish a standard using the radio propagation characteristics and received power for village broadcasting system in various environments.
Identification of First-order Plus Dead Time Model from Step Response Using HS Algorithm
Lee, Tae-Bong ;
The Journal of Advanced Navigation Technology, volume 19, issue 6, 2015, Pages 636~642
DOI : 10.12673/jant.2015.19.6.636
This paper presents an application of heuristic harmony search (HS) optimization algorithm for the identification of linear continuous time-delay system from step response. Identification model is first-order plus dead time (FOPDT), which describes a linear monotonic process quite well in most chemical processes and HAVC process and is often sufficient for PID controller tuning. This recently developed HS algorithm is conceptualized using the musical process of searching for a perfect state of harmony. It uses a stochastic random search instead of a gradient search so that derivative information is unnecessary. The effectiveness of the identification method has been demonstrated through a number of simulation examples.
Development of Baby Care Mobile Application Using Smart Sensor
Chung, Jae-Pil ;
The Journal of Advanced Navigation Technology, volume 19, issue 6, 2015, Pages 643~647
DOI : 10.12673/jant.2015.19.6.643
Nowadays, ubiquitous technology which combines sensors and network technology is emerging and it is called ubiquitous sensor network (USN). In this paper, mobile application for baby care using smart sensor is proposed. The proposed mobile application consists of mobile networks to transfer the information. It detects various information such as falling detecting, crying and fever detecting of infants. It keeps infants from external threats. The developed mobile application will be examined by simulation.