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Research on Airborne VHF Communication System Interference

Author: LiuFuXing
Tutor: ZuoQingZuo;LiDeGeng
School: South China University of Technology
Course: Electronics and Communication Engineering
Keywords: Airborne VHF Communicate Interference Adaptive filter
CLC: V243.1
Type: Master's thesis
Year: 2010
Downloads: 251
Quote: 1
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Abstract


With the rapid development of civil aviation , today's civil aircraft at an annual rate of at least 100 net . The airline , airline quantity, but also makes the total number of flights surge in the same time and dense airspace aircraft , air traffic increasingly busy , good communication is very important. To protect the safety of aircraft flying in the air , the need for reliable communications link real-time monitoring . VHF communications in the past few decades has been a civil aircraft is one of the most important means of communication , within a short distance in the better can be achieved as well as aircraft and between aircraft and the ground close monitoring, voice communication and data transmission . In the present civil aircraft , although with many types of communications equipment, but in the actual empty - empty space - ground communications applications , VHF communication is preferred , the most important means of communication. However, due to the special nature of VHF communications , resulting in airborne VHF equipment vulnerable to a variety of interference, resulting in air - air and air - ground communications disruption , but also led the ground monitoring data interruption , seriously affecting aircraft flight safety. In this paper, actual case studies of airborne VHF communication process a variety of possible interference, including days of electrical interference , adjacent channel interference , mirroring interference , co-channel interference , intermodulation interference , crosstalk , industrial disturbance , noise and so on. Among them, the civil FM radio stations for airborne VHF communications interference is particularly serious , but also focuses on the contents of this article , including general the generation mechanism of co-channel interference , and FM radio frequency interference with the mechanism , carried out a detailed derivation and demonstration, and propose the corresponding solutions. Reference herein Aircraft Maintenance Manual (AMM) and Component Maintenance Manual (CMM) in airborne VHF communications system equipment of the structure and parameters, airborne VHF communications support on research from airborne VHF communications equipment construction and environmental aspects , the reference examples of sources of interference on the VHF , interference phenomena , and for the FM radio frequency interference caused by the same research and analysis , propose co-channel interference resistance programs, measures . Designed an LMS adaptive filter , designed for FM radio interference filter, the solution using Matlab simulation and research. Implementation mechanism for VHF communications system disturbances and immunity research programs .

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CLC: > Aviation, aerospace > Aviation > Aircraft instrumentation,avionics, flight control and navigation > Electronic equipment > Aviation communications equipment
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