Title: LDACS-1 airborne receiver with high immunity to DME systems
Language: English
Authors: Koeppner, Reinhard 
Qualification level: Diploma
Keywords: LDACS-1; Empfänger; SESAR; DME
LDACS-1; Receiver; SESAR; DME
Advisor: Magerl, Gottfried
Assisting Advisor: Arthaber, Holger 
Issue Date: 2012
Number of Pages: 65
Qualification level: Diploma
Abstract: 
Das Ziel dieser Diplomarbeit ist die Entwicklung eines LDACS-1 konformen Empfänger-Prototypen. Dieser arbeitet im L-Band von 960...1164MHz mit einer Bandbreite von 500 kHz. Der Empfänger muss Signalpegel von -104...-10dBm verarbeiten und den, durch das DME-Navigationssystem verursachten, Störleistungen von bis zu 25dBm standhalten. Daraus ergibt sich die Herausforderung eine hohe Empfindlichkeit und Linearität mit der Unempfindlichkeit gegenüber starken Störern zu kombinieren.
Diese Arbeit zeigt das Design und die Messung eines kompletten HF-Frontends für einen LDACS-1 Empfänger. Die Entwicklung beginnt mit der Wahl der Empfängerstruktur und Überlegungen zu Rauschzahl und Linearität, gefolgt von der Bauteilauswahl und der Simulation der ganzen Empfangskette. Für einige Komponenten existieren unspezifierte Parameter, welche für die Implementierung kritisch sind. Daher werden geeignete Methoden gefunden, um diese zu messen und zu verifizieren. Danach wird eine eigens entworfene Leiterplatte präsentiert, welche die ganze Empfängerkette beinhaltet. Die Messungen zeigen, dass der hier vorgestellte Prototyp die LDACS-1 Anforderungen erfüllt und sogar übertrifft.

Air-traffic is rapidly increasing and is expected to have nearly doubled in Europe in 2030 compared to nowadays. As capacities are limited with the actual structure of air-traffic management, a new way needs to be found which, additionally, provides even higher security standards. The European Commission founded project 'SESAR' aims at achieving this target by the concept of trajectory based (instead of 'waypoint-to-waypoint') routing: Each aircraft shall get its preferred route and time of arrival. One major part in this concept is LDACS-1: A highly reliable wireless data link between aircraft and ground as well as between aircrafts.
The goal of this diploma thesis is the design of an LDACS-1 compliant receiver prototype. It operates in L-band at 960...1164MHz with a 0.5MHz channel bandwidth. The receiver has to handle input signal power levels of -104...- 10dBm and must withstand high interference power up to 25dBm introduced by the DME navigation system. Thus, the major challenge for the design is the combination of high sensitivity and linearity while maintaining immunity against strong interferers.
In this work the complete RF frontend for an LDACS-1 receiver is designed and measured. The development starts with the choice of the receiver structure and considerations regarding noise figure and linearity, continuing with the component selection and the simulation of the whole receiver chain. As some components lack implementation critical specifications, appropriate methods are found to measure and verify them. Thereafter, a custom designed PCB containing the complete receiver chain is presented. Measurements show that the presented prototype fulfills and even surpasses the LDACS-1 requirements.
URI: https://resolver.obvsg.at/urn:nbn:at:at-ubtuw:1-56974
http://hdl.handle.net/20.500.12708/13655
Library ID: AC07814370
Organisation: E354 - Institute of Electrodynamics, Microwave and Circuit Engineering 
Publication Type: Thesis
Hochschulschrift
Appears in Collections:Thesis

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