(4) After each option is determined, download the file. The file download format is
GRIB data. The GRIB data file is recorded in units. Each record contains the value
of a single physical quantity of a set of grid points on a height layer.
For the wind data stored in the GRIB format on each acquired air pressure layer, the
description file can only be generated after being decoded. The basic process is: First,
use the tool grib2ctl. exe generates a description file.ctl of the entire file. Then, use the
tool gribmap. exe generates a map file. idx; Finally, through its description file, the
form and structure information of the file storage record can be extracted to process the
data.
The specific process is shown in Fig. 1.
3 Meteorological Modeling of Trajectory Prediction
3.1 Track Prediction
Track prediction is a process of estimating the future trajectory of an aircraft by a track
predictor. The track predictor predicts the future direction of the aircraft based on the
current state of the aircraft, estimated flight intent, expected environmental conditions,
and aircraft performance, such as Fig. 2 shows.
Preparation process: The initial version of the flight script (aircraft flight intent) [8].
Data input requires flight planning, airline operating procedures, and air traffic
control restrictions on aircraft performance.
Calculation process: The core function of the track predictor. The flight script
contains a description of the aircraft’s operation, including its programmed air
traffic control restrictions. The track calculator integrates intent information with 4D
trajectory implementation using environmental condition prediction information
and aircraft performance data.
levelX GRIB
File
Generate
Description
File
Grib2ctl Tool
Processing
GribmapTool
Processing
Generate
Image File
Data reading
Meteorological
Wind Modeling
Wind Direction
And Speed at
any point
Matlab
Interpolation
Fig. 1. Flow chart of GRIB wind data processing
424
Y. Yin and M. Tong
GRIB data. The GRIB data file is recorded in units. Each record contains the value
of a single physical quantity of a set of grid points on a height layer.
For the wind data stored in the GRIB format on each acquired air pressure layer, the
description file can only be generated after being decoded. The basic process is: First,
use the tool grib2ctl. exe generates a description file.ctl of the entire file. Then, use the
tool gribmap. exe generates a map file. idx; Finally, through its description file, the
form and structure information of the file storage record can be extracted to process the
data.
The specific process is shown in Fig. 1.
3 Meteorological Modeling of Trajectory Prediction
3.1 Track Prediction
Track prediction is a process of estimating the future trajectory of an aircraft by a track
predictor. The track predictor predicts the future direction of the aircraft based on the
current state of the aircraft, estimated flight intent, expected environmental conditions,
and aircraft performance, such as Fig. 2 shows.
Preparation process: The initial version of the flight script (aircraft flight intent) [8].
Data input requires flight planning, airline operating procedures, and air traffic
control restrictions on aircraft performance.
Calculation process: The core function of the track predictor. The flight script
contains a description of the aircraft’s operation, including its programmed air
traffic control restrictions. The track calculator integrates intent information with 4D
trajectory implementation using environmental condition prediction information
and aircraft performance data.
levelX GRIB
File
Generate
Description
File
Grib2ctl Tool
Processing
GribmapTool
Processing
Generate
Image File
Data reading
Meteorological
Wind Modeling
Wind Direction
And Speed at
any point
Matlab
Interpolation
Fig. 1. Flow chart of GRIB wind data processing
424
Y. Yin and M. Tong