Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
The Journal of Advanced Navigation Technology
Journal Basic Information
Journal DOI :
The Korea Navigation Institute
Editor in Chief :
Volume & Issues
Volume 10, Issue 4 - Dec 2006
Volume 10, Issue 3 - Sep 2006
Volume 10, Issue 2 - Jun 2006
Volume 10, Issue 1 - Mar 2006
Selecting the target year
On Intelligent Paging Algorithm Maximizing Paging Processing Capacity in Wireless Networks
Lee, Dong-Jun ;
The Journal of Advanced Navigation Technology, volume 10, issue 4, 2006, Pages 291~298
A new intelligent paging algorithm is proposed in this paper to maximize the paging capacity in wireless link of mobile communication systems. Intelligent paging algorithms have been studied to utilize limited wireless resource efficiently, in which a location area is divided to several paging areas which are searched sequentially. Previous intelligent paging methods mainly use location probability distribution of the paging target terminal to determine paging areas. However, these methods make the paging traffic of each cell non-uniformly distributed. Therefore, in relatively low paging load conditions, there exist cells congested with paging traffic in which paging traffic queues are overflowed and paging messages are lost. The proposed method determines paging areas to make the paging traffic distributed uniformly among cells by considering current paging traffic distribution in each cell. Performance evaluation shows that the proposed method outperforms the previous paging schemes much with respect to paging processing capacity.
The Development of DURUMI-II for Control Surface Fault Detection and Identification and Flight Test
Park, Wook-Je ; Chang, Jae-Won ;
The Journal of Advanced Navigation Technology, volume 10, issue 4, 2006, Pages 299~305
DURUMI-II is developed into test bed airplane for the multi-purpose flight test. It satisfied the civil aeronautics law. DURUMI-II is equipped with Airborne System for acquiring of flight test data and can fly by oneself. In this paper, the redundancy of DURUMI-II control system is operated sequentially is explained. The divided control surface and the requiring program method for flight test are described. Also, it is described that the exact control input is applied using the new method. Finally, the results of flight test for new method are analyzed.
The Power Saving Strategy of Dual Mode Access Terminal in WiBro and WLAN Hierarchical Network
Moon, Tae-Wook ; Ko, Bong-Jin ; Cho, Sung-Joon ;
The Journal of Advanced Navigation Technology, volume 10, issue 4, 2006, Pages 306~311
When the WiBro/WLAN hierarchical network is structured, a dual mode access terminal should keep WLAN module with power on state for operating in WiBro network outside of WLAN hotspot zone. Power consumption of user's access terminal can be increased to maintain WLAN module power on state of dual mode access terminal in WiBro network outside of the hotspot zone. This paper focuses on power saving strategy for a dual mode access terminal in WiBro/WLAN Hierarchical network to overcome problems regarding power. We will apply information about hotspot in WiBro network to establish the efficient power saving strategy for dual mode access terminal.
Analysis on the Interference Effects from HAPS IMT-2000 System into Terrestrial IMT-2000 System in the Adjacent Bands
Kang, Young-Heung ; Choi, Mun-Hwan ;
The Journal of Advanced Navigation Technology, volume 10, issue 4, 2006, Pages 312~318
WRC-2000 allowed HAPS to provide IMT-2000 service in the bands 1885-1980 MHz, 2010-2025 MHz and 2110-2170 MHz which have been utilized by the conventional terrestrial IMT-2000 service. In this paper, we analyze the interference effects from HAPS into terrestrial IMT-2000 system in adjacent band. To do this, in this paper, we have analyzed the interference and the sharing criteria between HAPS and the conventional terrestrial/satellite mobile system by considering the service and system requirements, the specification of system and developing the interference scenarios and the analysis algorithms.
Surge and Rotating Speed Control for Unmanned Aircraft Turbo-jet Engine
Jie, Min-Seok ; Hong, Gyo-Young ; Lee, Kang-Woong ;
The Journal of Advanced Navigation Technology, volume 10, issue 4, 2006, Pages 319~326
In this paper, a fuzzy inference control system is proposed for a turbojet engine with fuel flow control input only. The proposed control system provides a practical fuel flow control method to prevent surge or flame out during engine acceleration or deceleration. A fuzzy logic is designed to obtain the fast acceleration and deceleration of the engine under the condition that the operating point should stay between the surge line and flame out control line. With using both engine rotating speed error and surge margin as fuzzy input variables, the desired engine rotating speed can be achieved to rapidly follow the engine control line without engine stall. Computer simulation using the MATLAB is realized to prove the proposed control performance to the turbojet engine which is linear modelized using DYGABCD program package.
A Study on the Cylindrical Microstrip Antenna for ISM Band Applications
Jeong, Don-Ki ; Choi, Byoung-Ha ;
The Journal of Advanced Navigation Technology, volume 10, issue 4, 2006, Pages 326~332
In this study, the antenna was proposed for the omni-directional characteristic in horizontal plane. Therefore we proposed
microstrip patch array on cylindrical surface for studying microstrip patch antennas. This antenna is designed for 2.45GHz ISM band and applications. This antenna can be applied to the base station of wireless microphone and access point of wireless LAN. The length and width of the patch antenna and the width of the feed line were calculated by using the theory of microstrip patch antenna, by using the both the 2.5D and 3D EM simulators the optimized antenna characteristics are obtained. From result of measured, antenna's impedance of coaxial waveguide port was 51.915-j3.688
, the return loss was -31dB and VSWR was 1.081.
UWB Pulse Generation Method for the FCC Emission Mask
Park, Jang-Woo ; Cho, Sung-Eon ; Cho, Kyung-Ryong ;
The Journal of Advanced Navigation Technology, volume 10, issue 4, 2006, Pages 333~341
This paper analyzes the spectral power properties of various time hopping UWB signals and shows that the power spectral densities of the various signals could have to be determined by the PSD of the pulse used in the signal. The pulse design method by which the FCC emission mask can be utilized fully is proposed. The method combines the arbitrary derivative Gaussian pulse linearly. The coefficients of the linear combination are calculated by the LSE(Least Square Error) method. Various parameters such as the number of coefficients and the types of the basic pulses are considered when calculating the PSD and pulse shapes of the new pulses.
The Design and Manufactured of U-Slot Broadband Antenna using L-Shaped 800MHz Band
Kim, Kab-Ki ;
The Journal of Advanced Navigation Technology, volume 10, issue 4, 2006, Pages 342~347
In this paper, we have designed 800[MHz] broad band antenna that is improves a narrow bandwidth problem of microstrip antenna and it will be able to integrate GSM, TRS band including the CDMA band. It had L-shaped feeding structure and added the U-slot it used a duplex resonance effect. Also for the improvement of profit the stack it did with the perpendicular. It seems to be good quality that design and manufactured antenna frequency bandwidth(VSWR 2:1) is 789~1086[MHz] with 297[MHz](33%). Also the E-plan and H-plan all profit 9.4[dBi] above, 3[dB] beam width was visible the quality which above
Design and Fabrication of the Frequency Multiplier for S-band Transponder
Kim, Byung-Soo ; Ko, Bong-Jin ;
The Journal of Advanced Navigation Technology, volume 10, issue 4, 2006, Pages 348~355
In this paper, frequency multipliers used S-band transponder of the KOMPSAT 3 are designed and fabricated. In the transponder, 108 times multiplier which generate 1st LO signal(2008.8MHz) is comprised of the X9 frequency multiplier, 1st X2 multiplier, 2nd X2 multiplier and the last stage of the X3 frequency multiplier. As results, output power of 8.17 dBm at 2008.8MHz, the harmonic suppression of -56.67dBc, the bandwidth of 14MHz were measured.
Performance Improvement of Satellite Broadcasting System in Rain Attenuation
Kang, Heau-Jo ;
The Journal of Advanced Navigation Technology, volume 10, issue 4, 2006, Pages 356~363
The demand for digital multimedia service using Ka band satellite communication are growing rapidly. So, in this paper, we have analyzed rain attenuation with typical model, and proposed prediction model of rain attenuation in high frequency(20 GHz). This paper illustrates Korea rain attenuation characteristics at the Ka band Koreasat beacon frequency based on the theoretical and empirical approaches and seek for efficient techniques by rain attenuation estimate and analyzed performance of adaptive modulation system. Propose prediction model of rain attenuation and parameter of satellite link can be available for the Ka band satellite communication.
Incorporating Fuzzy Inference into Watermarking in the Transform Domain
Kim, Yoon-Ho ;
The Journal of Advanced Navigation Technology, volume 10, issue 4, 2006, Pages 364~370
In this paper, the decision method of optimal sub-band which is supposed to embedded watermark incorporating fuzzy inference into transform-based watermarking is proposed. After performing the DCT, maximum variation of human visual properties, such as text degree, contrast sensitivity function is calculated, and by using these, membership function is generated. After embedding the watermark to the selected bands obtained from fuzzy inference, performance of imperceptibility and robustness are evaluated. In order to testify the proposed scheme, such attacks as JPEG, filtering, cropping are utilized. and in addition, by using an AWGN channel of OFDM/QPSK system, PSNR as well as correlation are calculated, and finally evaluated the performance.
Comparison of Two Methods for Determining Initial Radius in the Sphere Decoder
Jeon, Eun-Sung ; Kim, Yo-Han ; Kim, Dong-Ku ;
The Journal of Advanced Navigation Technology, volume 10, issue 4, 2006, Pages 371~376
The initial radius of sphere decoder has great effect on the bit error rate performance and computational complexity. Until now, it has been determined either by considering the statistical property of channel or by using of MMSE solution. The initial radius obtained by using statistical property of channel includes the lattice point corresponding to the transmit signal vector with very high probability. The method using MMSE solution first calculates out the MMSE solution of the received signal, then maps the hard decision of this solution into the received signal space, and finally the distance between the mapped point and the received signal is selected as the initial radius of the sphere decoding. In this paper, we derive a simple equation for initial radius selection which uses statistical property of channel and compare it with the method using MMSE solution. To compare two methods we define new metric 'Tightness'. Through the simulation, we observe that in low and moderate SNR region, the method using MMSE solution provides more complexity reduction for decoding while in high SNR region, the method using channel statistics is better.
Analysis of the Detection Time of Distress Signal for LEOSAR and MEOSAR Systems
Lim, Sang-Seok ;
The Journal of Advanced Navigation Technology, volume 10, issue 4, 2006, Pages 377~384
In this paper the detection time of the distress signal for the satellite-based search and rescue (SAR) system is evaluated. Present LEOSAR system in operation employs a few Low-altitude Earth Orbit (LEO) satellites and hence provides poor and local coverage availability. This results in a considerably long waiting time for a distress beacon to be detected by a rescue mission control center. One can expect that the detection time of the distress signal will be significantly reduced if the proposed MEOSAR system, which is based on the Medium-altitude Earth Orbit (MEO) satellites, is implemented. Taking into account the influence of the obstacles on the beacon signal, simulations are carried out to evaluate the detection time of distress signals for the LEOSAR and MEOSAR systems and the corresponding results are analyzed.
Performance Analysis of Location Estimation Algorithm Considering an Extension of Searching Area
Jeong, Seung-Heui ; Lee, Hyun-Jae ; Oh, Chang-Heon ;
The Journal of Advanced Navigation Technology, volume 10, issue 4, 2006, Pages 385~393
In this paper, we proposed a location estimation algorithm considering an extension of searching area in 2.45GHz band RTLS and analyzed its performance in terms of an average estimation error distance. The extendable searching area was assumed to be square of
and 2 dimensions. The arrangement shape of available readers was considered circle, rectangle, and shrinkage rectangle for extendable searching area. Also, we assumed that propagation path was LOS (Line-Of-Sight) environment, and analyzed the estimation error performance as a function of the number of received sub-blink considering an arrangement shape of available readers in searching area. From the results, compared with rectangle shape, circle shape showed the higher estimation accuracy. Also, we confirmed that the proposed location estimation algorithm provided high estimation accuracy in the shrinkage rectangle shape that was suitable for extension of searching area.
A Study on the Next Generation Dedicated Short Range Communication System using OFDM
Kim, Man-Ho ; Kang, Heau-Jo ;
The Journal of Advanced Navigation Technology, volume 10, issue 4, 2006, Pages 394~399
In this paper, we investigated performance for 5.8GHz dedicated short range communication system using OFDM which will be applied to Intelligent transportation system services. The maximum speed of a vehicle in DSRC channel is very fast as 180km/h, so a service time is very short to serve a various traffic information if hand-off is not occurred. Therefore higher bit rate is required to proved advanced and intelligent service to the drivers of various vehicle and the data transmission rate of the next generation DSRC system if being promoted over 10Mbps. The signals received in Clarke & Gans channel have been simulated using the computer simulator.
Moving Object Tracking in UAV Video using Motion Estimation
Oh, Hoon-Geol ; Lee, Hyung-Jin ; Baek, Joong-Hwan ;
The Journal of Advanced Navigation Technology, volume 10, issue 4, 2006, Pages 400~405
In this paper, we propose a moving object tracking algorithm by using motion estimation in UAV(Unmanned Aerial Vehicle) video. Proposed algorithm is based on generation of initial image from detected reference image, and tracking of moving object under the time-varying image. With a series of this procedure, tracking process is stable even when the UAV camera sways by correcting position of moving object, and tracking time is relatively reduced. A block matching algorithm is also utilized to determine the similarity between reference image and moving object. An experimental result shows that our proposed algorithm is better than the existing full search algorithm.
Performance Analysis of Watermarking using Audio and Image Watermark in Wireless Channel Environment
Kim, Yoon-Ho ; Park, Ki-Hong ;
The Journal of Advanced Navigation Technology, volume 10, issue 4, 2006, Pages 406~412
In this paper, we analyzed the performance of digital watermarking by using audio signal as well as logo image watermark. By utilizing the OFDM/QPSK system under AWGN channel environment, watermarked image are transmitted and detected. Experimental results showed that audio signal-based watermark embedding scheme is superior to that of logo image-based, which is able to restore a signal at SNR=3[dB].