The biggest technical loophole for the failure of the aircraft: the black box cannot return data in real time

[Abstract] The main reason for the failure to find the aircraft is that the black box is not able to return the data in real time, the target range is too large. Netizens "Look back": The aircraft failed to find the plane, the black box signal confirmed still elusive. In the past one months of positioning, search, which technology is the key to control the cruise aircraft search and rescue technology? Tencent technology: In order to search and rescue aircraft black box, countries have used from space, air to sea, water and other fields of technical means and high-tech equipment, launched an unprecedented international search. In search of the black box for example, underwater sonar detection technology can help find the black box. To date, the main reason for the failure to find an airliner is that the black box is not able to return data in real time, resulting in too much difficulty in searching the target range. To delay the best search and rescue time the black box learns the name "Flight recorder" (Flight recorder). The flight recorder installed on the airliner has 2 units, one is the aircraft data recorder (FDR), which is responsible for recording flight time, speed, altitude, aircraft rudder surface skewness, engine speed and other data; the other is the cockpit voice recorder (CVR), which is responsible for the dialogue of the personnel over the machine, the communication on the ground, And all the sounds in the cabin. It also means that if the plane's black box can be transmitted back to the data in real time, the ground crew will be able to master the position and course of the plane in the first place, and will not delay the best search and rescue time for the aircraft losing contact. The time for Malaysia to issue the first statement was 7:24 A.M., and the time between the passenger plane and the Ho Chi Minh control area losing communication with the control authorities was 1:30, from the loss of contact to the release of the missing information, which had a lag of about 6 hours. Six hours later, the position of the aircraft will be greatly changed, and the key is that because the black box can not be real-time data back, the flight direction of the aircraft can not be determined, if the aircraft did not continue to fly in accordance with the original route, or even turn back, then the entire search and rescue scope needs to Relying on the "Doppler effect" to determine the course of March 30, Malaysia announced the crash of the aircraft crashed in the southern Indian Ocean, but the original route is north. This has also led to an almost futile search and rescue effort. Malaysian Prime Minister Najib said 24th that the International Maritime Organization, with the help of the Doppler effect, revealed the flight trajectory of the MH370 flight. "Doppler effect" means that the frequency of the wave being received is less than the frequency of the transmission when the sources are away from the observer. Conversely, when a wave is coming toward the observer, the frequency of receiving the waves will be greater than the emission frequency. For example, when the train is near, people will feel the whistle more and more shrill, and the train away, the whistle tone is more and more low. The engineer of the Pegasus flight signal is likely to see that the frequency change characteristics of the AC signal between the aircraft and the satellite are in line with the plane's flight to the south, so that the aircraft turned south and eventually crashed in the southern Indian Ocean. Cost is an excuse to evade the problem. After the flight of the aircraft lost contact with various speculation, the Malaysian government has repeatedly issued inaccurate information, resulting in a bewildering number of events. In factThe biggest mistake is not the Malaysian government, not the rescuers, but the technical problems that have not been solved, especially the black box's real-time data transmission. Long before the MH370 flight, the global aviation industry has many sophisticated tools that can track aircraft and deliver black box data in real time. However, due to the low probability of aviation accidents and cost considerations, many airlines do not use these technologies, and regulators do not make such a mandatory rule. Since Air France suffered a major accident in 2009, it took investigators two years to finally locate the plane's black box. As a result, the industry has since been calling for airlines to launch real-time tracking of aircraft location or black box signal services. The problem now is that there is still a need to wait for the black box to start an accident investigation, which wastes a lot of valuable time. The Federal Aviation Administration said that the launch of the black box data real-time transmission service will pose a great challenge to the limited satellite bandwidth because there are many flights flying in the sky at all times. A viable solution is to reduce the operating costs of this model by controlling the amount of data transferred. For example, if the engine is overheating or the aircraft is off course to activate the service, the vehicle's transmission of information at a cost of about 5-10 dollars per minute. In other words, the cost does not become the black box real-time data transmission is unable to realize the reason, but more is one kind of excuse.