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(China Civil Aviation Flight Quality Monitoring System Data Transmission Specification)
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Basic data | Standard ID | MH/T 2010-2019 (MH/T2010-2019) | | Description (Translated English) | (China Civil Aviation Flight Quality Monitoring System Data Transmission Specification) | | Sector / Industry | Civil Aviation Industry Standard (Recommended) | MHT2010-2019: (China Civil Aviation Flight Quality Monitoring System Data Transmission Specification)
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Specification for data transmission for flight operation quality assurance system of
ICS 35.240.99
L 67
Civil Aviation Industry Standard of the People's Republic of China
Data Transmission Specification of China Civil Aviation Flight Quality Monitoring System
2019-01-19 release
2019-05-01 Implementation
Issued by Civil Aviation Administration of China
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the Aviation Safety Office of the Civil Aviation Administration of China.
This standard is under the jurisdiction of the China Academy of Civil Aviation Science and Technology.
Drafting organization of this standard. China Civil Aviation Science and Technology Research Institute.
Drafters of this standard. Wang Haofeng, Li Ye, Ding Xuan, Zhong Minzhu, Yu Liling, Xie Zinan, Li Bin, Shu Ping.
Data Transmission Specification of China Civil Aviation Flight Quality Monitoring System
1 Scope
This standard specifies the basic data transmission requirements and transmission specifications for fast access recorders and equivalent equipment, and the flight data ground receiving base station
Data reception and forwarding requirements.
This standard applies to the data collected by the Civil Aviation Flight Quality Monitoring System of Civil Aircraft onboard fast access recorders and equivalent equipment.
According to transmission related work.
Note. The data in this standard refers to the flight data recorded by the civil aircraft airborne rapid access recorder and equivalent equipment collected by the Civil Aviation Flight Quality Monitoring System of China.
Row data.
2 Terms and definitions
2.1
Flight operation quality assurance system of CAAC
By collecting civil aircraft flight data recorded by fast access recorders and equivalent equipment, according to the flight quality monitoring items and standards of the bureau
Quasi-monitoring, analysis and research of industry typical unsafe events, dynamic assessment of industry flight safety status and safety trends, and industry safety management
And supervise the system that provides data support.
2.2
Quick access recorder (QAR)
Airborne flight data recording equipment without protective devices that is mainly used to obtain flight data during daily operation.
Note. Including ordinary fast access recorders and wireless fast access recorders that do not have wireless data transmission capabilities.
2.3
Wireless quick access recorder (WQAR)
A fast access recorder with the function of transmitting flight data to the data receiving server through mobile communication technology.
Note. The working principle is that in the area covered by the communication network, when the aircraft is parked on the ground and the engine is off, the wireless quick access recorder
The flight data is transmitted to the ground data server, and the software system can automatically download and process the flight data without manual intervention.
2.4
Equivalent equipment
For some new civil aircrafts that are not equipped with wireless quick access recorders, wireless local area network WLAN or other communication networks can be used
The method automatically transmits the flight data recorded by the airborne equipment to the ground receiving base station of the flight data, and the equipment with the same function as the WQAR equipment.
2.5
Flight data ground base station
A data server configured on the ground, equipped with flight data ground receiving software, used to receive data from the fast access recorder and equivalent equipment
Data packets transmitted manually or manually and forwarded to the server of the Civil Aviation Flight Quality Monitoring System of China or other flight data analysis centers
end.
3 Basic requirements for data transmission
3.1 Data transmission security requirements
The data transmission function of the fast access recorder and equivalent equipment shall not impair the airworthiness of the aircraft regardless of normal or failure conditions
Or affect the normal operation of the aircraft. At the same time, the data recorded by the fast access recorder and equivalent equipment should be encrypted during transmission.
Ensure the security of the data itself.
3.2 Data transmission reliability requirements
For ordinary fast access recorders, the ground operator should ensure that the recording is on the storage medium (such as MO disc, PCMCIA card, CF card, etc.)
The data files in can be completely transmitted to the flight data ground receiving base station. For the data of wireless quick access recorder and equivalent equipment
Line transmission should have breakpoint resumable transmission or equivalent functions to ensure that the recorded data can be completely transmitted to the flight data ground receiving base station.
3.3 Data storage redundancy requirements
The storage system of the wireless quick access recorder and equivalent equipment should have a certain degree of redundancy. When the wireless transmission function is due to the machine or other reasons
When it is unable to work, you can download data through a backup method. For example, the system has a removable memory card that can store and backup at least 50 flights.
Hours of data.
3.4 Data package file name identification requirements
The name of the data package file should at least include the aircraft registration number and time information identification.
3.5 Data compression requirements
In order to improve the effectiveness and economy of data transmission, data should be compressed, and the data compression ratio should be 1.4 or higher.
3.6 Operational requirements
The wireless fast storage recorder and equivalent equipment shall meet the airworthiness certification requirements of the equipment, and the start and stop of the wireless transmission shall be carried out by the airborne
WQAR internal lock (INTERLOCK) logic circuit control to avoid the influence of false triggering of the transmitting circuit on the electromagnetic compatibility of the airborne environment.
4 Common fast access recorder data transmission method
4.1 Data storage method
Common storage media for fast access recorder data are generally MO discs, PCMCIA cards, CF cards, CFAST cards, etc. Fast in modern times
In the design of access recorders, this method is generally designed as a backup method for wireless fast access recorders and equivalent devices.
4.2 Data transmission and transfer methods
The data transmission and transfer method of the ordinary fast access recorder is generally carried out manually, and the ground operator regularly records the ordinary fast access recorder.
After the storage medium on the recorder is removed, the data is copied to the flight data ground receiving base station through the corresponding card reader and specific reading and writing software.
Then distributed to the relevant data analysis system.
5 Data transmission specifications for wireless fast access recorders and equivalent equipment
5.1 Data logging logic
The wireless fast access recorder and equivalent equipment should have certain data recording start and stop logic according to the needs of use to ensure data
According to the rationality of segmentation, the timeliness of transmission and sending.
Example. Recording starts after the engine of a civil aircraft is started or when the air-to-ground signal is "empty"; when the engine of a civil aircraft is turned off or the air-to-ground signal is "ground"
Stop recording.
5.2 Data sending logic
The wireless quick access recorder and equivalent equipment shall start and stop the wireless transmission function according to the airworthiness requirements and meet the corresponding conditions.
Example. Turn off the function of the radio transceiver unit during the civil aircraft's ground-to-ground phase to avoid causing wireless effects on airborne equipment during the civil aircraft flight.
Electrical interference; the function of the radio transceiver unit is turned on when the civil aircraft is on the ground and the door is open.
5.3 Data transmission method
5.3.1 Connecting to the Internet or local area network via wireless local area network WLAN
The design standard of wireless transmission module of wireless fast access recorder and equivalent equipment can be based on IEEE802.11x series, HiperLAN standard
Etc., see Table 1 for examples of frequency bands and operating rates.
5.3.2 Connecting to the Internet via mobile phone networks (including 2G, 3G, 4G, etc.)
The wireless transmission module of the wireless quick access recorder and equivalent equipment should support cellular mobile communication, and its modulation method can be single support or the same
When supporting GSM, WCDMA, TD-SCDMA, CDMA2000, LTE and other networks, see Table 2 for examples of network operating frequency bands.
The number of data transmission channels should consider the file size and transmission efficiency of the actual flight data packaged. Single channel or multiple channels can be used
Transfer data at the same time.
5.4 Encryption of data
In order to ensure the safety of flight data transmission, wireless fast access recorders and equivalent equipment should package and encrypt flight data.
The latter data packet is transmitted wirelessly to the ground receiving base station for flight data and then decrypted to complete the data analysis.
5.5 Data compression
In order to ensure the timeliness of flight data transmission, shorten transmission time, save channel bandwidth and transmission flow, wireless fast access recorder and
The equivalent device should compress the packaged data before transmitting data, and the data compression ratio should be 1.4 or higher.
5.6 Protocol for data transmission
The data transmission of wireless fast access recorder and equivalent equipment should adopt Internet transmission protocol as required.
5.7 Resumable data transfer and integrity confirmation
The wireless transmission of the wireless fast access recorder and equivalent equipment should have the function of resuming the transmission or equivalent function, which can transfer the data that has not been transmitted at the time.
The data continues to be transmitted when the next transmission is activated, and the integrity of the data is guaranteed.
5.8 Roaming of data transmission
The wireless transmission function of the wireless quick access recorder and equivalent equipment should support regional and international roaming, which can be turned on according to actual needs
Or turn off the roaming function.
5.9 Backup storage for wireless data transmission
When the wireless transmission mode of the wireless quick access recorder and equivalent equipment is not available, it shall have the function of data backup, such as writing and pluggable
Removable memory card. When the wireless transmission mode is restored, the data in the memory card can be retransmitted or the memory card transfer data can be obtained manually.
6 Data receiving and forwarding of flight data ground receiving base station
6.1 Reception of flight data ground receiving base station
The flight data ground receiving base station should be used in conjunction with wireless quick access recorders and equivalent equipment, which can be used with wireless transmission devices via the Internet.
Prepare for communication to ensure the integrity and accuracy of data reception.
6.2 Data decryption and decompression of the flight data ground receiving base station
The flight data ground receiving base station should have corresponding data decryption and decompression software (automatically or manually executed), which can be connected to the wireless network
The downloaded encrypted and compressed data packets are decrypted and decompressed to complete data analysis.
6.3 Forwarding of flight data ground receiving base station
The flight data ground receiving base station shall have or cooperate with other software to carry out flight data forwarding function, which can decrypt and decode the passed data.
The compressed data is forwarded and pushed to the data analysis system for data analysis, event detection, and data measurement.
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