Modern civil airports have the characteristics of large flight flow and high flight density. There will be interference among airports, radio equipment, navigation stations and non-radio equipment, and external electromagnetic signals have a great influence on civil aviation systems. Therefore, it is necessary to do a good job of checking the radio and internal navigation frequencies, and with the development of electronic equipment, these interferences are becoming more and more serious. This paper mainly analyzes the interference factors and anti-interference measures of civil aviation navigation signals.

Publication of communication engineering papers; Civil aviation navigation signals; Interference factors; counter-measure

Abstract The flight flow of modern civil airports has the characteristics of large and high density, and flights will interfere between airports, radio equipment, navigation stations and non-radio equipment. External electromagnetic signals have a great influence on civil aviation systems. To do this, it is necessary to do a good job in checking the radio and internal navigation frequencies. With the development of electronic equipment, this interference is becoming more and more serious. This paper analyzes the factors that interfere with civil aviation navigation signals and anti-interference measures.

Keywords publication of communication engineering papers, civil aviation navigation signals, interference factors, countermeasures

With the development of communication and radio technology in China, the electromagnetic environment has become more and more complicated, and radio interference has become more and more serious, which not only has a certain impact on radio communication, but also seriously affects the navigation frequency of civil aviation communication. It is very important to do a good job in jamming civil aviation navigation signals.

I. Interference Analysis of Navigation System of Civil Aviation System

Modern civil airports have the characteristics of large flight flow and high flight density. There will be interference among airports, radio equipment, navigation stations and non-radio equipment, which will also affect the work of navigation stations to a certain extent and seriously affect flight safety.

With the development of electronic equipment, these interferences become more and more serious. According to statistics, non-aviation interference sources are the most serious interference to civil aviation systems, mainly including the following:

First, radio communication equipment, including microwave communication equipment, short-wave radio stations and VHF ultrashort-wave radio stations;

The second is the radar used to monitor the flight state of the aircraft;

The third is the navigation equipment to guide the aircraft to take off and land;

Third, a computer management system for recording radar data and digital records;

Fourth, the closed-circuit television system for broadcasting TV programs and flight information;

Most of the above equipment is placed in a computer room, which makes the computer room an electromagnetic radiation system. If the electromagnetic compatibility problem is not handled properly, it will affect the operation of the system and even threaten the flight safety of the aircraft in serious cases.

In addition, both communication and navigation platforms and airports have electromagnetic radiation during operation, which cannot be completely eliminated. If the compatibility of equipment is not handled well, it will affect the normal operation of navigation system to some extent. In order to eliminate this interference, it is necessary to analyze it from the perspectives of station management, equipment layout and computer room construction, and take scientific countermeasures to eliminate all kinds of interference and ensure the flight safety of aircraft.

Second, measures to reduce the interference of civil aviation navigation signals

2. 1 Do a good job in electromagnetic environment test and equipment test.

Some radio stations that have not been approved by the relevant departments generally do not meet the national standards, and these radio stations need to work in a high-power transmission state. If the equipment is not tested, it is easy to cause interference. In order to avoid this problem, electromagnetic environment test and equipment test must be done well.

In the future, radio management agencies need to check radio stations regularly, and if there are security risks, they should find and deal with them as soon as possible. In order to ensure the smooth progress of this work, it is necessary to formulate the corresponding annual inspection system of the equipment, and analyze the antenna feed system, frequency, stray, power and other indicators of the broadcast transmitter to ensure that the equipment can work according to the relevant parameters.

2.2 governance of the internal environment

The internal interference of civil aviation system is serious, and the management department must realize the seriousness of this problem and take scientific measures to reduce the internal interference, which requires not only strengthening the governance of external electromagnetic environment, but also rectifying the internal. This can take the following measures:

First, rational use of communication and navigation stations and airport equipment

In order to eliminate interference to the maximum extent, it is necessary to make a scientific and reasonable layout of communication and navigation stations and related equipment in the airport. For antennas and equipment with the same working frequency, they need to be separated to ensure the isolation of antennas. For high-power receiving equipment and transmitting equipment, they need to be placed separately to avoid setting communication equipment in rooms with electromagnetic radiation. In the layout of the computer room, it is necessary to make an in-depth analysis of electromagnetic radiation, and the higher authorities can carry out testing when necessary. For some stray equipment, scientific shielding measures are needed.

Second, do a good job in controlling the electromagnetic environment inside the station and computer room.

Under normal circumstances, the internal equipment of stations and computer rooms is mainly configured in batches, which often has a certain impact on the safety and use of these equipment. Under normal circumstances, unless there is particularly serious interference, electromagnetic testing will not be carried out on the computer room. In addition, the electromagnetic interference in equipment has the characteristics of contingency and randomness, and its mechanism is complex. In order to prevent the electromagnetic environment from affecting the normal flight of the aircraft, it is necessary to control the electromagnetic environment in the station and the engine room to eliminate potential safety hazards in time. When adding new stations, it is also necessary to strengthen testing to avoid new equipment affecting the normal flight of the aircraft.

Three. Concluding remarks

In a word, external electromagnetic signals have great influence on civil aviation system. Therefore, it is necessary to check the radio and internal navigation frequency, which is not only an important measure to ensure the safety of civil aviation, but also conducive to the safety of people's lives and property. Therefore, attention should be paid to purifying the electromagnetic environment of each frequency band, dealing with the electromagnetic compatibility problem, formulating a perfect management system, strengthening the training and education of relevant personnel, strangling potential safety hazards in the cradle and ensuring flight safety.

References:

[1] Hu Minda, Li Chuzhou, Xiao Hua, Sean, Weng Linwei. Test and Analysis of Electromagnetic Environment of Fengyun No.3 Ground System in Guangzhou Railway Station [J]. Forum of Association for Science and Technology (Ⅱ). 2008 (08)

Han Jie, Tang Xiaoshan, Zhou Ping, Li Nan. Research on Wireless Intelligent Sensor Network and Wireless Measurement Technology in Wind Tunnel [J]. Experimental Fluid Mechanics.2009 (01)

Chen Fenfen. Design and Implementation of Beidou 1PPS Time Service System Based on FPGA and DSP [J]. Heilongjiang Science and Technology Information.2008 (36)

Li Bo, Huang Daqing. A New Test Method for System-level Electromagnetic Compatibility of UAV [J]. Journal of Sun Yat-sen University (Natural Science Edition) .2009 (02)

;