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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 6, Issue 4 - Dec 2002
Volume 6, Issue 3 - Nov 2002
Volume 6, Issue 2 - Aug 2002
Volume 6, Issue 1 - Jun 2002
Selecting the target year
Wideband Chirp Waveform Simulation and Performance Analysis for High Range Resolution Radar Imaging
Kwag, Young Kil ;
The Journal of Advanced Navigation Technology, volume 6, issue 2, 2002, Pages 97~103
A recent technology trends in synthetic aperture radar(SAR) requires the ultra high resolution performance in detecting and precisely identifying the targets. In this paper, as a technique for enhancing the radar range resolution, the wide band chirp connection algorithm is presented by stitching the several chirp modules with unit bandwidth based on the linear frequency modulated chirp signal waveform. The principles of the digital chirp signal generation and its architecture for implementation is described with the wide band chirp signal generator, modulator, and demodulator. The performance analysis for the presented algorithm is given with the simulation results.
Implementation and Test of DGPS Integrity Monitoring System
Yun, Youngsun ; Park, Sungmin ; Kee, Changdon ;
The Journal of Advanced Navigation Technology, volume 6, issue 2, 2002, Pages 104~112
Nowadays, many countries are interested in using CPS far navigation system of aircrafts, because it has technical and economic benefits. For the CPS based navigation system, the most important thing is reliability of the system. GPS navigation solution is very accurate. But when some faults are raised in the CPS navigation system of an aircraft, if they cannot be detected and alerts are not generated for pilots, the aircraft cannot be safe. So, I implemented an DGPS integrity monitoring system that detects faults of measurements and exclude the fault measurement from the satellite constellation used for calculating a navigation solution. This paper introduces 'the Least Square Residual Method' used to detect faults of measurements and the implemented real time integrity monitoring system using DGPS. To test the system, I operated the system under many different conditions. And from analysis of the data recorded, I could conclude that when the number of visible satellites was enough to detect faults, the system could detect the faults of measurements perfectly, isolate and exclude the fault measurement well. But for more reliable system, the measurement errors must be estimated more accurately and integrations of CPS and other instruments must be developed.
Internal GPS Antenna for Mobile Phone
Hwang, Jae-Ho ;
The Journal of Advanced Navigation Technology, volume 6, issue 2, 2002, Pages 113~118
In this paper, an internal GPS antenna for mobile phones is designed and fabricated. For the miniaturization of the antenna, high permittivity dielectric substrate((
=90) and small ground plane (
) are used. To increase the receive gain, the antenna is composed with LNA(Low Noise Amplifier). Results of the manufactured antenna(
) show that the maximum antenna gain is about 12 dBi, the axial ratio is less than 3 dB, and the current consumption of LNA is less than 4 mA.
Performance Analysis of the Turning Acceleration Estimator, Input Estimation and Variable Dimension Filters for Tracking Maneuvers
Choi, Sung-Won ; Lim, Sang-Seok ;
The Journal of Advanced Navigation Technology, volume 6, issue 2, 2002, Pages 119~129
Maneuvering targets are difficult to track for the Kalman filter since the target model of tracking filter might not fit the real target trajectory and the statistical characteristics of the target maneuver are unknown in advance. In order to track such a highly maneuvering target, several schemes have been proposed and improved the tracking performance in some extent. Among those tracking schemes the Input Estimation (IE), Variable Dimension (VD) and Turning Acceleration Estimator (TAE) became popular. However, so far their tracking performances were analyzed individually and were not compared. In this paper, the tracking performances of the typical IE, VD and TAE schemes for a maneuvering target are compared. Monte-Carlo Simulations for three maneuvering profiles are carried out and the results are analyzed towards practical applications.
Optimum and Sub-optimum Decoding Methods of Space-Time Trellis Coded Code Division Multiple Access Systems
Ki, Young Min ; Kim, Dong Ku ;
The Journal of Advanced Navigation Technology, volume 6, issue 2, 2002, Pages 130~137
We present Space-Time Trellis Coded Code Division Multiple Access systems, which maintain the full diversity and coding gain of Space-Time Trellis Codes(STTC) and have the immunity to performance degradation caused by multipath fading. These STTC CDMA systems are constructed by adding the spreading and despreading processes of PN codes to STTC systems. In multipath fading channels, delay spreaded signals are detected and combined, then decoded. According to the combining and decoding methods, there are four decoding methods. There are optimum ML decoding without combining, adding multipath signals in each receive antenna before decoding, combining multi path signals in each antenna before decoding, and combining all received signals before decoding. Performance of these methods is proportional to complexity. Besides, all methods are shown to compensate the irreducible error rate which appears in multipath fading channels.
An Efficient Adaptive Polarization-Space-Time Domain Radar Target Detection Algorithm
Yang, Yeon-Sil ; Lee, Sang-Ho ; Yoon, Sang-Sik ; Park, Hyung-Rae ;
The Journal of Advanced Navigation Technology, volume 6, issue 2, 2002, Pages 138~150
This paper addresses the problem of combining adaptive polarization processing and space-time processing for further performance improvement of radar target detection in clutter and Jammer environments. Since the most straightforward cascade combinations have quite limited performance improvement potentials, we focus on the development of adaptive processing in the joint polarization-space-time domain. Unlike a direct extension of some existing space-time processing algorithms to the joint domain, the processing algorithm developed in this paper does not need a potentially costly polarization filter bank to cover the unknown target polarization parameter. The performance of the new algorithm is derived and evaluated in terms of the probability of detection and the probability of false alarm, and it is compared with other algorithms that do not utilize the polarization information or assume that the target polarization is known.
Effect of Impulsive Noise in Bluetooth Multi-Piconet using ARQ Scheme
Kim, Do-Gyun ; Roh, Jae-Sung ; Cho, Sung-Joon ; Kim, Jung-Sun ;
The Journal of Advanced Navigation Technology, volume 6, issue 2, 2002, Pages 151~157
This paper has investigated the PER performance and the packet throughput of Bluetooth multi-piconet in the presence of impulsive noise, Rician fading, and co-channel interference. Specially, it is simulated the effect of co-channel interference in Bluetooth multi-piconet. From the simulation results, it is obtained that the co-channel interference due to multi-piconet and impulsive noise affects performance of Bluetooth multi-piconet. And, we have known that the SAW-ARQ method is very efficient to improve the performance of Bluetooth packet transmission.
Performance Analysis of WAP Packet Considering Multi-Slot SAR-QT Algorithm in Bluetooth Ad hoc Network
Moon, Il-Young ; Roh, Jae-Sung ; Cho, Sung-Joon ;
The Journal of Advanced Navigation Technology, volume 6, issue 2, 2002, Pages 158~167
In this paper, it is analyzed that WAP packet transmission time to improve performance of WAP using SAR-QT algorithm in Bluetooth channel. The order for SAR-QT algorithm to improve the transfer capability, it is fragmented in WTP total messages that are coming down from upper layer and then the packets are sent one at time in baseband. And it is studied that transmission time for WAP over Bluetooth according to DMI, DM3 or DM5 packet type using SAR-QT algorithm in Bluetooth piconet environment. This SAR-QT algorithm decreases WAP packet transmission time of L2CAP baseband packets by sending packet that are spanning multiple slots. From the results, in WAP over Bluetooth channels, it is found out that WTP packet size ought to be increased to decrease transmission time of WAP packet. In addition, considering BER in wireless channel, optimal WTP packet size is achieved for WAP over Bluetooth in a Rician fading environment.