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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Journal of Advanced Navigation Technology
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Journal DOI :
The Korea Navigation Institute
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Volume & Issues
Volume 3, Issue 2 - Dec 1999
Volume 3, Issue 1 - Mar 1999
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Implementation of the COHO Unit for Phase-locking of Radar
Cho, Tae-Bok ; Shin, Hye-Jin ; Lee, Taek-Kyung ;
The Journal of Advanced Navigation Technology, volume 3, issue 1, 1999, Pages 1~12
For the phase measurement of radar signal in the coherent-on-receiver system, the COHO(Coherent Oscillator) generates the signal which locks to the phase of the transmit pulse. In this paper, COHO unit is developed to generate 60 MHz phase-locked signal. ILO(Injection Locking Oscilator) locks to the sample of the transmit pulse. Gate circuit, ILO, buffer amplifier, and pulse generator are designed and implemented.
Precise Survey of Dokaebi Road Using CDGPS
Kee, Chang-Don ; Kim, Jeong-Han ;
The Journal of Advanced Navigation Technology, volume 3, issue 1, 1999, Pages 13~19
Using GPS carrier phase whose cycle ambiguities are resolved, it is possible to perform precise survey requiring centimeter-level positioning accuracy. Because of an optical illusion, we cannot recognize the exact slope of Dokaebi Road. In this paper, we performed kinematic survey experiments in order to calculate the exact slope of Dokaebi Road with high positioning accuracy of CDGPS. By post-processing experimental data using CDGPS, it was possible to generate the exact vertical trajectory of Dokaebi Road with centimeter-level accuracy.
Interference Analysis of TV Signal Affected by Flights of An Airplane around KimPo International Airport Circumference
Lee, Chan-Joo ; Kim, Bong-Cheol ; Cho, Sung-Joon ;
The Journal of Advanced Navigation Technology, volume 3, issue 1, 1999, Pages 20~31
In this paper, we have chosen KimPo International Airport as an area for estimating the flutter interference, in order to analyze the flutter interference. The field test at 25 points around KimPo International Airport and the simulation have been performed for estimating the flutter interference. We consider the received power of a direct wave, the height of an antenna, the ERP of a transmitting point, transmit frequency, and the reflection coefficients of an airplane, the transmit/receive point coordinates as estimation functions for the flutter. From the results, we have found that the flutter interference from flights is very serious around the route of flight circumference, and often occurs when the height of an airplane is low, range from 40 to 240 m. Besides, the degree of the flutter interference can be changed according to the distance between an airplane and a transmitting point, elevation angle, and the reflection coefficients of an airplane.
Sensor Fault Detection and Isolation of a Turbojet Engine Using Neural Network
Kim, Jong-Sun ; Lee, Kang-Woong ; Kim, Jin-Gon ; Boo, Joon-Hong ; Yoo, Sang-Sin ; Min, Seong-Ki ;
The Journal of Advanced Navigation Technology, volume 3, issue 1, 1999, Pages 32~43
In this paper, we designed an intelligent fault detection and isolation algorithm for improving reliability of turbojet engine controller. The proposed method uses multilayer neural network to detect and accommodate sensor failure from the functional relationship of dissimilar sensors. Signals of failure sensors are estimated from neural network trained by backpropagation algorithm. Simulation results on the state-space model of a turbojet engine illustrate that the proposed algorithm achieves the desired performance.
Fuzzy-Inference Control of a PWM Inverter for 400 Hz AC Voltage Regulation
Lee, Man Hee ; Song, Jae Ik ; Lee, Kang Woong ;
The Journal of Advanced Navigation Technology, volume 3, issue 1, 1999, Pages 44~51
In this paper we proposed an output voltage regulation scheme of a single-phase PWM inverter used to obtain a 400 Hz sinusoidal AC voltage for an aircraft. The fuzzy-inference control scheme is designed to achieve good output voltage tracking in the presence of load change or parameter variations. The PWM gate signals are determined by the fuzzy-inference controller using the error between the reference voltage and the feedback voltage and the derivative of error. The tracking performance of
Analysis of the Linear Amplifier/ADC Interface in a Digital Microwave Receiver
Lee, Min Hyouck ; Kim, Sung Gon ; Choi, Hee Joo ; Byon, Kun Sik ;
The Journal of Advanced Navigation Technology, volume 3, issue 1, 1999, Pages 52~59
Digital microwave wideband receiver including linear amplifier, analog-to-digital converter(ADC) and digital signal processor is able to analyze its performance using sensitivity and dynamic range of system. Determination of gain, third-order intermodulation products and ADC characteristics and design criteria for the linear amplifier chain is essential problem for sensitive and dynamic range. Also, if there are two signals with frequencies very close, digital signal processor must be able to separate the two signals. In this paper, we measured dynamic range as gain was changed and determined gain value for the proper sensitivity and dynamic range and high resolution spectrum estimation was used to separate two close signals.
A Background Image Generation Method for Image Detector Using Detected Vehicle Information
Kwon, Young Tak ; Kim, Yoon Jin ; Park, Chul Hong ; Kim, Hee Jeong ; Soh, Young Sung ;
The Journal of Advanced Navigation Technology, volume 3, issue 1, 1999, Pages 60~68
In this paper, we propose a new background generation method for image detector for traffic information collection. Conventional methods result in bad performance when there are frequent traffic jams due to heavy traffic. To improve on this, we use high level information from vehicle detection. Only part of the image that is not considered as vehicle is used in background generation. The proposed method finds background more robustly than that of the conventional methods even in the presence of heavy traffic.
A Study on the Improvement of the Utilization of the Korean Airspace
Choe, Young-Il ;
The Journal of Advanced Navigation Technology, volume 3, issue 1, 1999, Pages 69~90
The Korean airspace is very much limited, but its users are many. Especially many special using airspaces for military aircraft are formulated within the Taegu Flight Information Region and it is so restricted for civil aircraft to use the military airspaces. However, as the demand of civil air traffic is increasing, positive cooperation among the users of the airspace is needed to cope with the demand and to uplift the utilitation of the Korean airspace. Most of airspace except airways within the FIR are restricted areas, prohibited areas or operation areas for the military purpose. This thesis shows how to improve the utilitation of the Korean airspace and how much economical benefit the suggestion gives.