Specific embodiment
With reference to specific embodiment, the present invention is further illustrated.
The purpose of decoding is, by binary flight data file, to be converted into discernible engineering value.Due to being based on
The flying quality of ARINC767 specifications is entirely different with traditional, thus the algorithm of decoding also difference is very big.
Flying quality decoding analysis method of the present invention based on ARINC767 specifications, as shown in figure 1, including step:
The flying quality of step s101, acquisition based on ARINC767 specifications.
Flying quality, refers to the flying quality downloaded from airplane data record system, and its form is binary file.For
787 aircrafts, flying quality has 3 classes, and a class is by safeguarding EAFR (the Enhanced Airborne that notebook ML is downloaded
Flight Recorder) data, a class is to be synchronized to LSAPL (Loadable Software Airplane Part
Librarian can load aircraft software components library) CPL (Continuous Parameter Logging) data on server,
Another kind of is the CPL data by TCU (Terminal Cellular Unit) using wireless network transmissions to ground-based server.
This three classes data can read in calculator memory by automatic or manual mode.
Step s102, the synchronization character for searching flying quality, extract the frame ID after synchronization character.
EB90 synchronization characters are found, and validity check is done to frame ID and frame length after synchronization character etc., take out the time of frame
Stamp TimeStamp.
Step s103, aircraft number is parsed according to the filename of flying quality, call initial configuration corresponding with aircraft number
Parameter database.
Flying quality, due to the normalization that it is named, can parse some very important information from filename, like flying
Machine number, data download time etc., in order to follow-up data processing.
It is step s104, all length characteristics of frame ID of flying quality and length in the parameter database of initial configuration is special
Levy and compare, row decoding is entered to flying quality according to the parameter database of initial configuration if consistent, call if inconsistent adaptive
The trial and error decoding subalgorithm answered.
Because the aircraft factory chamber of commerce irregularly updates the database software about log, for decoding ginseng
Number database also has corresponding multiple versions, and the purpose of trial and error decoding subalgorithm is to call all default parameter databases successively
Enter row decoding, until finding the database of matching till.Specifically, when the length characteristic of all frame ID of flying quality with initially match somebody with somebody
When length characteristic in the parameter database put is inconsistent, the parameter database of other versions is changed one by one, until flying quality
The length characteristic of all frame ID is consistent with the length characteristic in parameter current database, is replaced with parameter current database and is initially matched somebody with somebody
The parameter database put, and the parameter that included according to frame ID and the length shared by parameter, are entered successively using parameter database
Row decoding, by binary flying quality engineering value is converted to.Alarm is ejected if all parameter databases all attempt failure
Information.
Step s105, according to the various parameters for decoding out, carry out leg divide and airport matching.
Because original flying quality is all continuous recording, all of leg all blends together, and forms one continuously
Binary file.One of purpose of decoding is exactly that Partial key parameter is decoded in advance, such as vacant lot electric switch, UTC, fuel oil
Flow, pressure altitude, radio altitude, ground velocity etc., according to the change of these parameters, binary file are divided into complete one by one
Whole leg file.The division of leg is also always a difficult point during decoding.The unexpected disappearance of such as data record, touches
Go around, this training etc. all can to leg divide interfere, affect divide accuracy.The introducing of novelty of the present invention
Privilege level concept, after the data analyses for combining a large amount of true legs, the perfect leg of a kind of comparison for drawing divides solution
Certainly scheme.
After vacant lot electric switch is detected by ground is switched in the air, activation leg partitioning algorithm monitoring is carried out according to priority
Leg divides.
Limit priority:If radio altitude is changed into 0, ground velocity is 0, after the fuel flow of two is also changed into 0, monitoring
The change of UTC time, if there is breakpoint, then whole machine power-off after explanation boat, aircraft no longer record data, now to leg
Carry out that cutting is ideal, the purpose of leg cutting is the separation of the previous leg and latter leg for finding optimum.
Two grades of priority:If the first situation is not present, such as miss the stop flight, miss the stop during will not power-off, this
When press the second priority, monitor fuel flow to carry out cutting after 0.
Three-level priority:If this training, aircraft is repeated landing training, then second situation also will not be deposited
Leg cutting is now being carried out before take off next time.
Special priority:There are the data that some are special, for some reason, flying quality loss, such as certain segment data are just
Journey, unexpected data outage, the data that next second has directly been arrived before another leg is taken off are flown over flat.Such case just should be supervised
Discontinuous point and height and fuel flow during control, by abnormal special priority, carry out leg cutting near breakpoint.
The advantage of above-mentioned leg partitioning algorithm:Adapt to almost all of leg data to divide, and all the time with optimum side
Formula carries out cutting, can shield interference of the special circumstances such as loss of data to algorithm, accurately divides leg.
The parameter of flight data recording does not have take-off and landing airport, only longitude and latitude parameter.Therefore, when data analysis is arrived
When takeoff point and landing point, need according to longitude and latitude, immediate airport name is matched in default Global Airports database.Together
When airport is matched, often there is the situation of matching error, such as the airport in Seattle airport and Boeing base to class software in Jing, both
It is spaced closely together, if algorithm not enough optimizes, it is easy to matching error.The present invention adopts Allowance Design, and reserved tolerance interface,
User can directly change.
By interface function, obtain user and tolerance is set;
Default airport database is traveled through, according to longitude and latitude tolerance, most possible airport list is filtered out;
Difference of longitude and latitudinal difference are calculated respectively, take the minimum airport of comprehensive deviation as final matching airport.
The advantage of above-mentioned algorithm is that user can pass through reserved interface, adjust tolerance, can correct the knot of decoding
Really.Because the airplane inertial longitude and latitude that calculates of navigation, can have certain deviation, if pilot is not carried out to inertial navigation in time
Correction, cumulative errors can be increasing, is finally possible to airport matching error.And the tolerance of this algorithm, it is allowed to user is carried out
Amendment.
Fly into nearly vertical section, be a new proposition, in conventional domestic and international decoding system, do not referred to and reality
It is existing.The present invention is projected in each location point near procedure that flies on the vertical guide Chong Die with runway centerline, Ran Houhui
What LOC guidance stations processed and GS guidance stations intersected most preferably enters near line.The realization of this kind of algorithm, greatly improves the effect of data analysis
Rate and the degree of accuracy, have intuitively reproduced flying scene very much.
Algorithm details:
The distance into nearly runway head to blind landing platform is obtained from relevant approach, enters the longitude and latitude of near-end runway head, run when entering near
The pressure altitude in road, when VOR (VHF OMNI-DIRECTIONAL RANGE VHF Omnidirection ranges) enters near each obstacle detouring point away from
From and height etc. information;
Origin with Approach End of Runway entrance as reference axis, X-axis be plane distance runway head enter the floor projection of near-end away from
From Y-axis is height of the aircraft relative to runway;
If ILS (Instrument landing system instrument-landing-systems) enters closely, the transmitting of blind landing platform is drawn
3 degree or 5 degree are entered near line, and by airport, actual data of announcing are defined;
If NDB (Non-Directional Beacon Non Direction Beasons) enters closely, each obstacle detouring point and its height are drawn;
The distance of current aircraft longitude and latitude and runway threshold longitude and latitude is calculated, is painted with reference to the height of the relative airport plane of aircraft
Aircraft profile line processed.
Aircraft enters the drafting of nearly vertical section, intuitively presents very much aircraft location, and aircraft altitude is near with entering
Relative position of line etc., can be data analysis, and FOQA saves the substantial amounts of time.
After all decoding terminates, will preserve in decoding information and early warning information write background data base, preserve necessary day
Will, backup significant data etc..
The following aspects is included to the improvement of business after above-mentioned algorithm realization:
1st, the complexity in user's use is alleviated
During data decoding, user need not know the corresponding parameter database of frame format of current original flying quality, this
It is bright to attempt various parameters database automatic code translation, and the parameter library of current trial and success can be preserved, can be straight when decoding next time
Connect and call.This mode can reduce the complexity that software is used, and reduce software and use the training time.
2nd, algorithm is increased income, and user's customization degree is high
User can write analysis and patrol to data analysis logic of propositions, parameter database secondary development according to the demand of oneself
Volume, event-monitoring and super-limit prewarning, improve data user rate.Data can be provided for aircraft maintenance and flight quality to support, in time
The each system of early warning transfinites, troubleshooting in advance, reduces aircraft and stops field time.
3rd, data analysis process is simplified
Parameter engineering value after decoding shows that in friendly way support diagram curve mode shows, is easy to user directly perceived
Judgement Parameter Variation.Support for flying quality to import Online Map simultaneously, draw complete leg flight path, draw
Flight vertical section when aircraft is left the theatre or marched into the arena, user can effectively judge the problem for existing of flying, and save analysis time,
Simplified analysis process.
4th, use cost is saved
Existing decoding system, after aircraft configuration change or Airborne Software update, original decoding data storehouse is no longer fitted
With, even trickle variation, is required for purchasing new decoding storehouse again, the substantial amounts of fund of consuming.The present invention can support to use
Family is self-defined to be created modification or directly producer's file is converted into into new decoding storehouse, greatly shortens renewal and solve problem
Cycle, saved the cost for using.
Above-listed detailed description is illustrating for possible embodiments of the present invention, and the embodiment simultaneously is not used to limit this
Bright the scope of the claims, all equivalence enforcements or change without departing from carried out by the present invention, in being intended to be limited solely by the scope of the claims of this case.