Industrial Machinery radio interference airport command
Shantou Airport around factories and heavy machinery operation rarely produced by cognitive radio interference
A few kilometers away from the airport, power machinery, the airport will be able to run up-to-air communication frequency interference signals. May 6, Shantou City, Shantou, China Aviation Commission and the Radio Stations and industrial machinery joint investigation with the radio interference out of the event, the timely removal of the potential threats to civil aviation safety hazard. Yangcheng Evening News survey found that the daily production and life, there are a lot of electronic equipment, industrial machinery, are in the course of radio frequency signals generated, and the surrounding area in Shantou airport operators of many companies, management of cognitive radio very poor, inadvertently made their own “band of harassment,” few are ignorant.
Airport-to-air communications have been repeatedly “frequent harassment”
April 8 this year, Shantou China Airlines aircraft flight control station responsible for directing the reflection of the tower controller said: frequency-to-air command received intermittent “Kaka” interfere with sound. Since then, many dedicated civil aviation air-ground communication frequency interference has been unknown. Technical support for air traffic control station technology department to organize for the investigation of interference sources, and will be reported interference Shantou no commissioned. After the frequency of the various inspection equipment, site equipment, excluding the possibility of interference.
Because of this “frequency harassment” intermittent, when the weak signal strength, caused great difficulty to the investigation, to at 14:50 on April 22, interference signal a sudden strengthening of the frequency also changed: it was working with the tower controller Units in the primary frequency calls, directing the plane took off, suddenly the two sides also receive “Kaka” interference sound, if the air command and call quality is not good, may appear to understand the control command pilot error happens, will seriously affect aviation safety, but fortunately was in primary frequency, emergency frequency can be used not the case, the standby frequency without interference, immediately contact the tower controller unit to enable the frequency, before flying back to normal order.
The unknown impact of radio interference is a serious primary air-to-air frequency, emergency frequency of use, Shantou Shantou radio air traffic control station to the letter the Committee filed a complaint. Shantou no air traffic control stations of the Committee and the joint investigation work group, with the assistance of relevant departments in Chenghai investigation started, will eventually interfere with the source locked outside in the 3.22 km from the airport, the customs of a six-storey building near the plant. Interference source is located in the plant site, measuring instruments, signal strength measured with great frequency interference. After investigation, the sixth floor of the factory workshop being melted plastic heat sealing machine (high frequency plastic welding machine), it is the source of interference “culprit.”
According to investigation, the source of interference is a manufacturer of toy manufacturer factory, bought in April this year, two powerful heat sealing machine used in production. The mechanical aging of the device, the operating frequency drift, several harmonics are with the civil aviation VHF radio band overlap, equipment, airport equipment placed in the floor with no other tall buildings block the antenna, thus creating a strong signal interference.
Industrial Machinery radio management is still “blank”
Joint Working Group on the plant site management science education, ordered the plant to stop using the sets of equipment. Managers expressed some “injustice” because they really do not know their own use of machinery will have even radio waves, but did not think would affect air traffic for several kilometers outside of work. Shantou Radio Stations Forest Commission chief, told reporters in investigation work, we found the source of interference was found most users do not intentional move, in addition to other radio professionals, most users are very familiar to radio frequency . It is understood that most of the industrial machinery products, and its products are not indicated in the instructions may interfere with aviation communications about specific precautions.
Adjacent to the airport in Shantou Chenghai District of Shantou City, light manufacturing, toys, wool-intensive manufacturers such as the size, nature is also frequently used industrial machinery and land. According to experts, industrial machinery, high frequency, the harmonics generated is easy to fall air traffic on the VHF high band. Lung Industrial operators of a toy company boss Chen has also been experience frequency interference, according to its introduction, the factory is producing its own wireless remote control toys, and near other manufacturers started using high-frequency machines, they tend to affect plant technical staff in the wireless remote control test. Mr Chan said: “Most business owners know the use of industrial machinery even produce radio waves, but also unaware of how widespread its impact was.”
It is understood that the present management system of radio and civil aviation facilities does not provide the number of kilometers around the ban on the use of high-frequency mechanical equipment to say, only limited work product may not use the Civil Aviation Communications VHF frequency band.
Industry sources said the Air Traffic Management, Shantou, the investigation department of radio interference to the industrial machinery, is a new problem. Basically, had previously not received the case of industrial machinery and signal interference, the gradual emergence of nearly two years, estimated with aging equipment. According to reports, the current management of the domestic industrial machinery, more relaxed, do not accept the radio for the record, due to radio interference can not be seen or touched, which gives management the work of investigation and sources of interference caused considerable difficulty