The Experts below are selected from a list of 222 Experts worldwide ranked by ideXlab platform
Joshua T. Neville - One of the best experts on this subject based on the ideXlab platform.
-
Direct-sequence spread spectrum spectral overlay in the Instrument Landing System glideslope and microwave Landing System bands
The 23rd Digital Avionics Systems Conference (IEEE Cat. No.04CH37576), 2004Co-Authors: Joshua T. Neville, David W. MatolakAbstract:We compare the performance of direct-sequence spread spectrum (DS-SS) code-division multiple access (CDMA) Systems used in spectral overlay mode in two different aeronautical bands: the Instrument Landing System glideslope (ILS-GS) band, from 329-335 MHz, and the microwave Landing System (MLS) band, from 5091-5150 MHz. The purpose of the overlay System is to enable increased spectral efficiency (higher data throughput), for future potential aeronautical data link communications. The effect of the DS-SS System upon the existing aeronautical System (ILS-GS or MLS) is also briefly addressed. Beginning with basic physical characteristics of the two bands, and classical communications analyses, we estimate the potential data rates in both bands for a range of transmit powers, antenna gains, bit error ratios (BER), and example ILS-GS, MLS, and CDMA System parameters. Our comparison uses both analysis and numerical evaluation. We illustrate that while the ILS-GS band offers more favorable propagation conditions, the MLS band offers significantly higher throughputs.
-
Spectral Overlay of Direct-Sequence Spread Spectrum in the Instrument Landing System Glideslope Band
Journal of Aerospace Computing Information and Communication, 2004Co-Authors: David W. Matolak, Joshua T. NevilleAbstract:In this paper, we examine the effects of intentional spectral overlay between a directsequence spread spectrum (DS-SS) code-division multiple-access (CDMA) System and the glide slope signal of the Instrument Landing System (ILS) currently employed by the Federal Aviation Administration (FAA). The purpose of the overlay System is to enable increased spectral efficiency (higher data throughput), for future potential aeronautical datalink communications, e.g., an “airborne internet.” That is, this overlay would enable simultaneous use of the ILS glideslope band by the current glide slope Systems and a new DS-SS CDMA digital communication System. We estimate the performance degradation incurred by both Systems for several values of transmit powers, DS-SS bandwidths and data rates, and typical ILS glideslope and CDMA System parameters. Our study uses both analysis and computer simulations. We provide examples that explore both ILS glideslope and CDMA System parameter values appropriate for the successful application of the overlay technique.
-
Spectral overlay of direct-sequence spread spectrum in the Instrument Landing System glidescope band for airborne Internet
22nd Digital Avionics Systems Conference Proceedings (Cat No 03CH37449) DASC-03, 2003Co-Authors: David W. Matolak, Joshua T. NevilleAbstract:We examine the effects of intentional spectral overlay between a direct-sequence spread spectrum (DS-SS) code-division multiple-access (CDMA) System and the glide scope signal of the Instrument Landing System (ILS) currently employed by the Federal Aviation Administration (FAA). The purpose of the overlay System is to enable increased spectral efficiency (higher data throughput), for future potential aeronautical datalink communications, e.g., an "airborne Internet." That is, this overlay would enable simultaneous use of the ILS band by the current glide slope Systems and a new DS-SS CDMA digital communication System. We estimate the performance degradation incurred by both Systems for a range of transmit powers, DS-SS bandwidths and data rates, and typical ILS and CDMA System parameters. Our study uses both analysis and computer simulations. The use of the CDMA System as a possible air-to-air (GA) data link is examined, and we provide examples that explore both ILS and CDMA System parameter values appropriate for the successful application of the overlay technique.
David W. Matolak - One of the best experts on this subject based on the ideXlab platform.
-
Direct-sequence spread spectrum spectral overlay in the Instrument Landing System glideslope and microwave Landing System bands
The 23rd Digital Avionics Systems Conference (IEEE Cat. No.04CH37576), 2004Co-Authors: Joshua T. Neville, David W. MatolakAbstract:We compare the performance of direct-sequence spread spectrum (DS-SS) code-division multiple access (CDMA) Systems used in spectral overlay mode in two different aeronautical bands: the Instrument Landing System glideslope (ILS-GS) band, from 329-335 MHz, and the microwave Landing System (MLS) band, from 5091-5150 MHz. The purpose of the overlay System is to enable increased spectral efficiency (higher data throughput), for future potential aeronautical data link communications. The effect of the DS-SS System upon the existing aeronautical System (ILS-GS or MLS) is also briefly addressed. Beginning with basic physical characteristics of the two bands, and classical communications analyses, we estimate the potential data rates in both bands for a range of transmit powers, antenna gains, bit error ratios (BER), and example ILS-GS, MLS, and CDMA System parameters. Our comparison uses both analysis and numerical evaluation. We illustrate that while the ILS-GS band offers more favorable propagation conditions, the MLS band offers significantly higher throughputs.
-
Spectral Overlay of Direct-Sequence Spread Spectrum in the Instrument Landing System Glideslope Band
Journal of Aerospace Computing Information and Communication, 2004Co-Authors: David W. Matolak, Joshua T. NevilleAbstract:In this paper, we examine the effects of intentional spectral overlay between a directsequence spread spectrum (DS-SS) code-division multiple-access (CDMA) System and the glide slope signal of the Instrument Landing System (ILS) currently employed by the Federal Aviation Administration (FAA). The purpose of the overlay System is to enable increased spectral efficiency (higher data throughput), for future potential aeronautical datalink communications, e.g., an “airborne internet.” That is, this overlay would enable simultaneous use of the ILS glideslope band by the current glide slope Systems and a new DS-SS CDMA digital communication System. We estimate the performance degradation incurred by both Systems for several values of transmit powers, DS-SS bandwidths and data rates, and typical ILS glideslope and CDMA System parameters. Our study uses both analysis and computer simulations. We provide examples that explore both ILS glideslope and CDMA System parameter values appropriate for the successful application of the overlay technique.
-
Spectral overlay of direct-sequence spread spectrum in the Instrument Landing System glidescope band for airborne Internet
22nd Digital Avionics Systems Conference Proceedings (Cat No 03CH37449) DASC-03, 2003Co-Authors: David W. Matolak, Joshua T. NevilleAbstract:We examine the effects of intentional spectral overlay between a direct-sequence spread spectrum (DS-SS) code-division multiple-access (CDMA) System and the glide scope signal of the Instrument Landing System (ILS) currently employed by the Federal Aviation Administration (FAA). The purpose of the overlay System is to enable increased spectral efficiency (higher data throughput), for future potential aeronautical datalink communications, e.g., an "airborne Internet." That is, this overlay would enable simultaneous use of the ILS band by the current glide slope Systems and a new DS-SS CDMA digital communication System. We estimate the performance degradation incurred by both Systems for a range of transmit powers, DS-SS bandwidths and data rates, and typical ILS and CDMA System parameters. Our study uses both analysis and computer simulations. The use of the CDMA System as a possible air-to-air (GA) data link is examined, and we provide examples that explore both ILS and CDMA System parameter values appropriate for the successful application of the overlay technique.
Xiubin Zhao - One of the best experts on this subject based on the ideXlab platform.
-
A study of Instrument Landing System on decimeter-wave
Second International Conference on Space Information Technology, 2007Co-Authors: Yongsheng Wang, Dewei Wu, Xiubin ZhaoAbstract:This paper puts forward a new type of Landing System based on decimeter wave, in-depth analysis on the forming of navigation information under this System, indicates the characteristics of the Landing System, and defines the main technologies; provides the approach to realize the Landing System with the application of decimeter wave Instruments, puts forward the methods and the simulation of the generation of navigation signal and the establishment of antenna array radiation pattern, providing the theoretical gist for the development of decimeter wave Instruments Landing System.
-
Multipath effect suppression for Instrument Landing System based on MUSIC
International Conference on Space Information Technology, 2005Co-Authors: Xiubin Zhao, Yongsheng Wang, Hengle Jiang, Chuanjin DaiAbstract:The Decimeter-wavelength Instrument Landing System is designed to assure an exact and timely flight arrival on many airports. But its signal can often be distorted by reflections and scattering caused by objects which are illuminated by the radiating antennas, sometimes referred to be "multipath", which pose a great threat to the System's operation. In this paper, an improved receiver based on spatial spectrum estimation concepts is proposed for safer automatic Landing procedures. The new approach is based on Direction of Arrival (DOA) estimation performed by the MUSIC algorithm and signal filter performed by beamforming algorithm. The superior performance of the proposed System with respect to currently employed techniques in the presence of unwanted interferences has been tested in extensive computer simulations.
W U Dewei - One of the best experts on this subject based on the ideXlab platform.
-
design of simulation System to uav decimeter wave Instrument Landing System
Computer Simulation, 2007Co-Authors: W U DeweiAbstract:Simulation is one of the most important parts in study of UAV(unmanned aerial vehicle) Landing System. Navigation signals and antenna radiation field of decimeter wave Instrument Landing System were analyzed,and the mathematical model was established. Based on them,the simulation System of UAV decimeter wave Instrument Landing System was designed with the support of LabView’s abundant graphic functions and powerful mathematics functions. Simulation results demonstrate that the simulation System can better simulate the change of antenna pattern according to the change of course angle and glide angle in the process of Landing.
-
a flight test method research on Instrument Landing System applied to a far zone
Journal of Air Force Engineering University, 2003Co-Authors: W U DeweiAbstract:A new method of flight test on Instrument Landing System, based on microwave Landing System, is introduced in this paper. By choosing particular course and data processing, this method is suitable for flying test on the far zone of Instrument Landing System, and can be used for making a statistical analysis to the flight test result.
Yongsheng Wang - One of the best experts on this subject based on the ideXlab platform.
-
A study of Instrument Landing System on decimeter-wave
Second International Conference on Space Information Technology, 2007Co-Authors: Yongsheng Wang, Dewei Wu, Xiubin ZhaoAbstract:This paper puts forward a new type of Landing System based on decimeter wave, in-depth analysis on the forming of navigation information under this System, indicates the characteristics of the Landing System, and defines the main technologies; provides the approach to realize the Landing System with the application of decimeter wave Instruments, puts forward the methods and the simulation of the generation of navigation signal and the establishment of antenna array radiation pattern, providing the theoretical gist for the development of decimeter wave Instruments Landing System.
-
Multipath effect suppression for Instrument Landing System based on MUSIC
International Conference on Space Information Technology, 2005Co-Authors: Xiubin Zhao, Yongsheng Wang, Hengle Jiang, Chuanjin DaiAbstract:The Decimeter-wavelength Instrument Landing System is designed to assure an exact and timely flight arrival on many airports. But its signal can often be distorted by reflections and scattering caused by objects which are illuminated by the radiating antennas, sometimes referred to be "multipath", which pose a great threat to the System's operation. In this paper, an improved receiver based on spatial spectrum estimation concepts is proposed for safer automatic Landing procedures. The new approach is based on Direction of Arrival (DOA) estimation performed by the MUSIC algorithm and signal filter performed by beamforming algorithm. The superior performance of the proposed System with respect to currently employed techniques in the presence of unwanted interferences has been tested in extensive computer simulations.