CN100449329C - Data format conversion method fitting the need of broadcasting type automatic relevance monitoring message processing request - Google Patents
Data format conversion method fitting the need of broadcasting type automatic relevance monitoring message processing request Download PDFInfo
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Abstract
The invention relates to a data format converting method which accords with the processing requirement of broadcast typed automatic relative monitoring datagram. The invention comprises that the ADS-B 1090 datagram is read. The position datum of a global positioning system are obtained by a computer loading selecting typed machine loading responder, the positioning datum are converted to the values of time label data item of the global positioning system in the CHN21 format. The data items which are relative with the speed of an aerocraft, the mark of the aerocraft and the position of the aerocraft in the ADS-B 1090 datagram are taken out, and the data items are converted into data items in the CHN21 format. The processing for the ADS-B 1090 datagram at a regulating ATC workstation is realized by using the method in which the ADS-B 1090 datagram is converted into the datum of CHN21 format. The accurate time of the position datum of the global positioning system received by a plane is obtained through the datagram.
Description
Technical field
The present invention relates to a kind of message data format conversion method, particularly a kind of conversion method of data format that meets Automatic dependent surveillance broadcast (Automatic Dependent Surveillance Broadcast is called for short ADS-B) message processing request.
Background technology
The basic goal of air traffic control is to make aircraft safety on the course line, effectively and in a planned way fly in the spatial domain, and the controller need dynamically carry out real time monitoring to the flight of aircraft in the control zone.
Traditional radar surveillance means adopt interrogator-responder system to target detection.In the long run, radar system self has a lot of limitation, has limited the raising of monitor performance.The rectilinear propagation of radar beam has formed a large amount of radar shadow, can't cover areas such as ocean and desert; The radar swing circle has limited the raising of data updating rate, thereby has limited the raising that monitors precision; Can't obtain the situation data such as plan air route, speed of aircraft, the raising and the short-term collision that have limited tracking accuracy detect the alarm STCA ability of (Short Time Conflict Alert is called for short STCA).Therefore, need the new supervision means of exploitation.
ADS-B utilizes aircraft to broadcast the precise location information that is generated by airborne satellite-based navigation and positioning system automatically, uphole equipment and other aircrafts receive this information by aeronautical data chain, and satellite system, aircraft and ground based system are realized the integrative coordinated supervision in the empty world by the high-speed data chain.ADS-B has not only overcome some problems of traditional radar surveillance means, and has advantages such as precision height, turnover rate height, applied range, uphole equipment construction and maintenance cost are low.
With reference to the ADS-B of CAAC technical policy, ADS-B will at first be applied to the empty supervision in ground as a kind of emerging surveillance technology, promptly play a kind of effect that is similar to radar, and " class radar " service is provided.The difference of the maximum of ADS-B and traditional ground radar just is that this technology provides a kind of mechanism of initiatively launching self state of flight information, compare with traditional radar data in airborne self the state of flight information of ADS-B and increased GPS (Global Positioning System, abbreviation GPS) information such as position, speed, and the turnover rate of ADS-B data is faster.Therefore the ADS-B message is different fully with the form of radar, does not meet existing radar information general switch structure ASTERIX (AllPurpose Structured Euro control Radar Information Exchange) form.ASTERIX is the universal architecture by the definition of European air navigation tissue, is used to overcome the defective of existing national form and interface, realizes that European air navigation organizes the radar information exchange.Because ADS-B does not support this general structured form, therefore the Traditional regulation workstation need carry out fairly large software and hardware upgrading and just can directly handle the ADS-B message, and because turnover rate height, the data volume of message are huge, based on the processing power of present control workstation, can not guarantee that the monitoring data that the ADS-B technology provides for the controlling officer has very high real-time and correctness.
For make existing control workstation automated system can realize to the ADS-B message receive, the seamlessly transitting of processing, need provide a kind of based on the ADS-B message that has control workstation processing capacity now with meet changing the mechanism between the data of ASTERIX form.At present, European aviation safety organizes EUROCONTROL to design a kind of brand-new data layout 21 Type C ategory21 of the ASTERIX of meeting form.The Category21 form extracts the data in the message as the format transformation of message, again according to ASTERIX form assembling message, and sends to the processing of control workstation.But on the one hand, this Category21 form is at countries such as America and Europes the actual demand of ADS-B technology to be formulated, and not in full conformity with the requirement of China to the ADS-B application; On the other hand, EUROCONTROL has only announced the form of Category21, and undeclared transfer process and principle, and CAAC need be according to Chinese actual conditions, formulation meets the data layout of Chinese application demand, and studies the mutual conversion process between two kinds of forms.
In addition, do not have temporal information in 1090 messages (1090 messages are a kind of as the ADS-B message) that secondary radar uses at present, but calculate the emission answer delay of radar and the particular location that the pulse position angle obtains aircraft by radar head.Principle Figure 1 shows that prior art radar detection target theory synoptic diagram as shown in Figure 1.Among Fig. 1, secondary radar land station at first launches up interrogation pulse, and be t launch time
0, the time that the airborne answering machine of airborne selecting type (also being called airborne S pattern answering machine usually) receives this up interrogation pulse is t
1, airborne S pattern answering machine responds this interrogation pulse after receiving this interrogation pulse, and the time of airborne S pattern answering machine emission transponder pulse is t
2, secondary radar land station receives that the time of transponder pulse is t
3
The delay of the time that transmits and receives of up interrogation pulse is t
1-t
0, the time delay that transmits and receives of transponder pulse is t
3-t
2, these two time delays are identical, i.e. (t
1-t
0)=(t
3-t
2), can be by following formula (1) in the hope of these two time delays,
(t
1-t
0)＝(t
3-t
2)＝[(t
3-t
0)-(t
2-t
1)]/2 (1)
And the process of echo not in the ADS-B technology, the data airborne equipment is initiatively launched monitor message, therefore can't directly obtain the temporal information of aircraft acquisition GPS position data by 1090 messages.Simultaneously because present airborne equipment can not arbitrarily be changed the time mark of therefore also can't annotating when airborne S pattern answering machine is launched 1090 messages.
Summary of the invention
The objective of the invention is to overcome the shortcoming of prior art, provide a kind of and convert ADS-B 1090 messages to meet the ASTERIX formatted data data transfer device, make existing control workstation automated system can realize reception and processing, and can know that aircraft obtains the accurate moment of GPS position data according to this message to ADS-B 1090 messages.
To achieve these goals, the invention provides a kind of conversion method of data format that meets the Automatic dependent surveillance broadcast message processing request, comprising:
Step 1, read Automatic dependent surveillance broadcast 1090 messages;
Step 2, acquisition Data Format Transform module are received the moment of described message and the time of the airborne answering machine deal with data assembling of airborne selecting type message, the time that the moment that the Data Format Transform module is obtained described message deducts the airborne answering machine assembling of airborne selecting type message obtains the moment that the airborne answering machine of airborne selecting type obtains the GPS position data, and the moment that will the airborne answering machine acquisition of described airborne selecting type GPS position data converts the value of GPS time tag data item in China-21 type format to;
Step 3, step 3, extract in Automatic dependent surveillance broadcast 1090 messages and the aircraft speed contiguous items, and convert this data item in China-21 type format corresponding data item; Extract in Automatic dependent surveillance broadcast 1090 messages and aircraft sign contiguous items, and convert this data item in China-21 type format corresponding data item; And extract in Automatic dependent surveillance broadcast 1090 messages and the position of aircraft contiguous items, and convert this data item in China-21 type format corresponding data item.
Conversion method of data format provided by the invention, compared with prior art, obtained following technique effect:
(1) by ADS-B 1090 messages being converted to the China-21 type format data that meet the ASTERIX form, realized (the Air Traffic Control of traffic control aloft, abbreviation ATC) workstation is to the processing of ADS-B 1090 messages, the real-time and the accuracy of ADS-B surveillance technology have been guaranteed, and this method is simple to the processing of message, adapts to the processing needs of existing ATC control workstation;
(2) by in China's-21 type format messages, adding GPS time tag data item, value with this data item when the ATC workstation receives ADS-B 1090 messages serves as that foundation can calculate the exact value that aircraft obtains the moment of GPS position data, thereby the message by China's-21 type formats just can obtain the positional information of any moment aircraft, has overcome the defective that can't know temporal information in the prior art by ADS-B 1090 messages.
Also in conjunction with the accompanying drawings the present invention is described in further detail below by specific embodiment.
Description of drawings
Figure 1 shows that prior art radar detection target theory synoptic diagram;
Figure 2 shows that CHN21 data segment schematic layout pattern of the present invention;
Figure 3 shows that the present invention meets the conversion method of data format process flow diagram of Automatic dependent surveillance broadcast message processing request;
Figure 4 shows that the present invention meets obtains the moment principle schematic that aircraft receives the GPS position data in the conversion method of data format of Automatic dependent surveillance broadcast message processing request;
Figure 5 shows that the present invention meets GPS time tag data item flow path switch figure in the conversion method of data format of Automatic dependent surveillance broadcast message processing request;
Figure 6 shows that the present invention meets pressure directions speed data flow path switch figure in the conversion method of data format of Automatic dependent surveillance broadcast message processing request;
Figure 7 shows that the present invention meets ground vector data flow path switch figure in the conversion method of data format of Automatic dependent surveillance broadcast message processing request;
Figure 8 shows that the present invention meets destination address data-switching process flow diagram in the conversion method of data format of Automatic dependent surveillance broadcast message processing request;
Figure 9 shows that the present invention meets target identification data-switching process flow diagram in the conversion method of data format of Automatic dependent surveillance broadcast message processing request;
Figure 10 shows that the present invention meets target reporting identification data flow path switch figure in the conversion method of data format of Automatic dependent surveillance broadcast message processing request;
Figure 11 shows that the present invention meets dbjective state data-switching process flow diagram in the conversion method of data format of Automatic dependent surveillance broadcast message processing request;
Figure 12 shows that the present invention meets type of aircraft identifier data flow path switch figure in the conversion method of data format of Automatic dependent surveillance broadcast message processing request;
Figure 13 shows that the present invention meets longitude and latitude data-switching process flow diagram in the conversion method of data format of Automatic dependent surveillance broadcast message processing request;
Figure 14 shows that the present invention meets height level data-switching process flow diagram in the conversion method of data format of Automatic dependent surveillance broadcast message processing request;
Figure 15 shows that the present invention meets position accuracy data flow path switch figure in the conversion method of data format of Automatic dependent surveillance broadcast message processing request.
Embodiment
In the China that the present invention relates to-21 type (English name the is CHN21) data layout data segment layout as shown in Figure 2, the CHN21 data layout meets the ASTERIX form, and can finish and ADS-B 1090 messages between data-switching.Figure 2 shows that CHN21 data layout synoptic diagram of the present invention.Among Fig. 2, first＜CHN=21〉show that whole data segment comprises ADS-B information, show by one 82 system numerical tables.Second＜length〉show whole data segment length (this length comprises first＜CHN21〉and second＜length this length of two), show by two 82 system numerical tables.The 3rd＜the data item zone bit〉be to the 4th＜data item thereafter in the detailed description of data, because the 4th＜data item〉each data item uncertain, therefore＜the data item zone bit length uncertain, need determine the 3rd＜the data item zone bit according to actual conditions〉represent by 2 system numbers.The 4th＜data item〉in each data item deposit message data through decoding because wherein data item is uncertain, therefore＜data item length uncertain.
CHN21 form and radar format compatible, simple in structure, data volume is little, can handle message at ATC control workstation, and guarantee higher real-time and accuracy.
Each data item content is as shown in Table 1 in the CHN21 form:
| The data item zone bit | Data item | Length |
| 1 | The target reporting sign | 2 |
| 2 | The GPS time tag | 3 |
| 3 | Longitude and latitude | 8 |
| 4 | Destination address | 3 |
| 5 | Positional precision | 2 |
| 6 | Height level | 2 |
| 7 | Pressure directions speed | 2 |
| Expansion | Characterize this back and whether continue to have the expansion position | - |
| 8 | The ground vector | 4 |
| 9 | Object identifier | 6 |
| 10 | Dbjective state | 1 |
| 11 | The type of aircraft identifier | 1 |
Table one
In the table one, whether the extension flag bit table after the 7th of the data item zone bit is levied to continue to have after this position and is expanded the position, if the expansion afterwards of this position then is labeled as 1 with this data item; If also have the position of expansion after this position, then this data item be labeled as 0.
Added GPS time tag data item in the CHN21 form shown in the table one, just can know that by adding this data item aircraft receives the moment of GPS position data, just can know according to this moment and CHN21 form message and receive data such as constantly aircraft speed of GPS position data, aircraft sign, position of aircraft at aircraft.
Describe message data conversion method of the present invention below in detail
Figure 3 shows that the present invention meets the conversion method of data format process flow diagram of Automatic dependent surveillance broadcast message processing request, is specially:
Step 1, read ADS-B 1090 messages; 1090 messages are a kind of of ADS-B message, message of the present invention all refers to 1090 messages in the ADS-B message, among the present invention this message is called ADS-B 1090 messages for convenience of explanation, message data format conversion method involved in the present invention also is only applicable to ADS-B 1090 messages.
Step 2, obtain the Data Format Transform module is received described message by gps antenna the moment, obtain airborne S pattern answering machine and handle the time of GPS position data and assembling message, the moment that the Data Format Transform module is obtained described message deducts airborne S pattern answering machine and handles the time of GPS position data and obtain the moment that airborne S pattern answering machine obtains the GPS position data, and the moment that will described airborne S pattern answering machine acquisition GPS position data converts the value of GPS time tag data item in the CHN21 type format to;
Step 3, extract in Automatic dependent surveillance broadcast 1090 messages and the aircraft speed contiguous items, and convert this data item in China-21 type format corresponding data item; Extract in Automatic dependent surveillance broadcast 1090 messages and aircraft sign contiguous items, and convert this data item in China-21 type format corresponding data item; And extract in Automatic dependent surveillance broadcast 1090 messages and the position of aircraft contiguous items, and convert this data item in China-21 type format corresponding data item.
Figure 4 shows that the present invention meets obtains the moment principle schematic that aircraft receives the GPS position data in the conversion method of data format of Automatic dependent surveillance broadcast message processing request, the moment that airborne S pattern answering machine obtains the GPS position data is T
0, and T
0Should calculate according to following formula (2):
T
4-T
0＝(T
4-T
3)+(T
3-T
2)+(T
2-T
1)+(T
1-T
0) (2)
Wherein, T
1Be the moment of airborne S pattern answering machine emission ADS-B 1090 messages, T
2For the Data Format Transform module receives moment of ADS-B 1090 messages, T
3Be the moment of the CHN21 formatted data after the process Data Format Transform module converts from the output of Data Format Transform module, T
4For Control Centre receives moment of CHN21 formatted data, T
1-T
0Handle various data (comprising GPS position data, flight plan data etc.) and various data sets are dressed up time of message for airborne S pattern answering machine, hardware manufacturing manufacturer can provide fixing industry experience value, T
2-T
1For the time of ADS-B 1090 messages vacant lot transmission between airborne S pattern answering machine and Data Format Transform module, can ignore; T
3-T
2For the Data Format Transform module is converted to CHN21 formatted data required switching time with ADS-B 1090 message format data, hardware manufacturing manufacturer can provide fixing industry experience value, T
4-T
3For the CHN21 formatted data between Data Format Transform module and Control Centre time of ground transmission because the difference of ground ground transmission medium and transmission length, therefore the mistiming T that between Data Format Transform module and Control Centre, transmits
4-T
3Can not ignore, because T
2-T
1Mistiming can ignore, so formula (2) can become:
T
4-T
0＝(T
4-T
3)+(T
3-T
2)+(T
1-T
0) (3)
According to the mathematical operation rule, remove the bracket on equation (3) the right, obtain formula (4)
T
4-T
0＝T
4-T
2+(T
1-T
0) (4)
Equation (4) two ends are merged like terms, obtain
T
0＝T
2-(T
1-T
0) (5)
The Data Format Transform module will receive the moment T of the ADS-B 1090 message format data that have the GPS position data
2Deduct (T
1-T
0) value just can obtain the moment T that airborne S pattern answering machine obtains the GPS position data
0Value, with T
0The value corresponding conversion become the value of GPS time tag data item in the CHN21 form.After Control Centre receives CHN21 form message, just can know that according to this GPS time tag data item data in the CHN21 form have reflected the data of what constantly aircraft speed, position of aircraft etc.
Figure 5 shows that the present invention meets GPS time tag data item flow path switch figure in the conversion method of data format of Automatic dependent surveillance broadcast message processing request, is specially:
Present embodiment is by adding GPS time tag data item in CHN21 form message, value with this data item serves as according to obtaining the exact value that aircraft obtains the moment of GPS position data, having overcome the defective that can't know temporal information in the prior art by ADS-B 1090 messages.
In the conversion method of ADS-B 1090 messages and CHN21 formatted data, extract and the aircraft speed contiguous items, and become the method for the data item in the CHN21 form to comprise the value corresponding conversion of this data item: A, pressure directions speed data conversion method; B, ground vector data conversion method.
A, pressure directions speed data conversion method
Figure 6 shows that the present invention meets pressure directions speed data flow path switch figure in the conversion method of data format of Automatic dependent surveillance broadcast message processing request, is specially:
Steps A 1, read message;
The value of the 33rd to the 37th data item type (TYPE) judges whether the value of TYPE is 19 in steps A 2, the extraction message; If, execution in step A3; Otherwise, execution in step A9;
Steps A 3, determine that the type of message is aircraft speed infomational message (Airborne VelocityInformation Message);
Steps A 4, read the value of the data item vertical speed source phase place (Source Bit forVertical Rate) of the 68th of message, judge whether it is 1, if, execution in step A5 then; Otherwise, judge that the vertical speed rate type is a geometric type, execution in step A9;
Steps A 5, judgement vertical speed rate type are air pressure speed;
Steps A 6, extract the value of the data item vertical velocity signal phase place (Sign Bit forVertical Rate) of the 69th of message, obtain the directional data of vertical speed rate;
Steps A 7, read the value of the data item vertical speed (Vertical Rate) of the 70th to 78 of messages, obtain the speed data of pressure directions;
Steps A 8, the 70th to the 78th the data item pressure directions speed that will obtain become the value of pressure directions speed data item in the CHN21 form with the 69th data item vertical speed rate direction corresponding conversion;
Steps A 9, end.
B, ground vector data conversion method
Figure 7 shows that the present invention meets ground vector data flow path switch figure in the conversion method of data format of Automatic dependent surveillance broadcast message processing request.Concrete grammar is as follows:
Step B 1, read message;
Step B2, extract in the message the 33rd to the 37th data item TYPE, whether the value of judging TYPE is the some integers in 5,6,7,8, if, execution in step B3; Otherwise, execution in step B7;
The type of step B3, judgement message is scene position message (Surface Position Message);
Step B4, the 38th to the 44th the value corresponding conversion of data item in the message become the value of the corresponding data item in the CHN21 form; The 38th has characterized with reference to world geodetic system-84 (World Geodetic System-84 to the 44th bit data item displacement (Movement) in the message, be called for short WGS-84) ground speed of model, the value corresponding conversion of Movement is become the value of the 32nd to the 17th ground speed data item in the ground vector data item in the CHN21 form;
The value of the 45th bit data item track cornet mark position (Status Bit for GroundTrack) judges whether next the 46th to 52 data item track angle (Ground Track) is available in step B5, the extraction message, if, execution in step B6, otherwise, execution in step B7;
Step B6, the 46th value corresponding conversion to the 52nd bit data item in the message become the value of the corresponding data item in the CHN21 form; The the 46th to 52 bit data item Ground Track has characterized the track angle, if data item Ground Track can use, then its corresponding conversion is become the 16th to the 1st track angle-data item in the ground vector data item in the CHN21 form;
Step B7, end.
In the conversion method of ADS-B 1090 messages and CHN21 formatted data, will identify the contiguous items corresponding conversion with aircraft and become the method for the data item in the CHN21 form to comprise: C, destination address data transfer device; D, target identification data transfer device; E, target reporting identification data conversion method; F, dbjective state data transfer device; G, type of aircraft identifier data conversion method.
C, destination address data transfer device
Figure 8 shows that the present invention meets destination address data-switching process flow diagram in the conversion method of data format of Automatic dependent surveillance broadcast message processing request.Concrete grammar is as follows:
Step C1, read message;
Step C2, read in the message value of the 9th to the 32nd data item address entries, obtain destination address;
Step C3, extract message destination address data item, and the value corresponding conversion of this data item is become the value of the destination address data item in the CHN21 form;
Step C4, end.
D, target identification data transfer device
Figure 9 shows that target identification data-switching process flow diagram in the message data format conversion method of the present invention, concrete grammar is as follows:
Step D1, read message;
Step D2, read in the message the 33rd to the 37th data item TYPE, judge whether the value of TYPE is 1,2,3,4 one of them integer, if, execution in step D3; Otherwise, execution in step D7;
Step D3, determine that type of message is aircraft classification message (Aircraft Identification and TypeMessage);
Step D4, read in the message the 41st to the 88th data item feature (Character) 1-8;
The 41st to the 88th data item in step D5, the decoding message;
Step D6, extract the value of the 41st to the 88th data item, and its corresponding conversion is become the value of the target identification data item in the CHN21 form;
Step D7, end.
E, target reporting identification data conversion method
Figure 10 shows that the present invention meets target reporting identification data flow path switch figure in the conversion method of data format of Automatic dependent surveillance broadcast message processing request, concrete grammar is as follows:
Step e 1, read message;
The 33rd to the 37th data item in step e 2, the extraction message, if the value of TYPE equals 2, the type of then judging message is Aircraft Identification and Type Message, execution in step E3; If the value of TYPE equals the some integers in 9-18 or the 20-22 interval, the type of then judging message is position of aircraft message (Airborne Position Message), execution in step E6; If the value of TYPE equals the some integers among the 1-4, the type of then judging message is Aircraft Identification andType Message, execution in step E7;
Step e 3, judge whether the value of the 6th to the 8th type of aircraft (Emitter Category) data item in the message is 3, if, execution in step E4; Otherwise, execution in step E5;
The value of step e 4, Emitter Category is 3, has characterized to be the report from the place monitor, and the value in the source of the 12nd bit data item monitor message in the target reporting identification data item (RAB) is set to 1 in the CHN21 form accordingly;
If the value of step e 5 Emitter Category is not 3, the value of the 12nd bit data item RAB in the target reporting identification data item is set to 0 in the CHN21 form accordingly;
Step e 6, determine value and the 5th the value of the 10th special position identification (Special PositionIdentification is abbreviated as SPI) data item in the target reporting identification data item corresponding in the CHN21 form according to the value of the minimum effective value zone bit of the 48th bit data item in the value of the 38th to 39 bit data item monitored state (Surveillance Status) in the message and the message to the 4th bit data item height alert capability (ARC); Be specially: judge whether the 38th to 39 bit data item Surveillance Status equals 3 in the message, if, there is SPI in sign, the 10th SPI data item in the corresponding target reporting identification data item is set to 1 in CHN 21 forms accordingly, otherwise the 10th SPI data item in the target reporting identification data item in the CHN21 form is set to 0 accordingly; Whether the value of judging the 48th bit data item in the message is 0, if, then accordingly in the target reporting identification data item in the CHN21 form the 5th value to the 4th bit data item ARC be set to 2, characterizing height reporting capabilities minimum resolution is 100ft; Otherwise the 5th value to the 4th bit data item ARC is set to 1 in the target reporting identification data item in the CHN21 form accordingly, and characterizing height reporting capabilities minimum resolution is 25ft.
Step e 7, read the 6th value in the message, and its corresponding conversion is become the 6th value to the 8th bit address classification (ATP) data item in the target reporting identification data item in the CHN21 form to the 8th Emitter Category.
Other all zero paddings of conduct reservation position in the target reporting identification data item in the CHN21 form.
F, dbjective state data transfer device
Figure 11 shows that the present invention meets dbjective state data-switching process flow diagram in the conversion method of data format of Automatic dependent surveillance broadcast message processing request, concrete grammar is as follows:
Step F 1, read message;
Step F 2, judge whether the 33rd value to the 37th bit data item TYPE is 28 in the message, if, execution in step F3; Otherwise, execution in step F6;
The type of step F 3, judgement message is aircraft state message (Extended Squitter AircraftStatus Message);
Step F 4, judge whether the 38th value to the 40th bit data item subtype is 1 in the message, if, execution in step F5; Otherwise, execution in step F6;
Step F 5, extract the 41st value in the message, and convert it value of the dbjective state data item in the CHN21 form to accordingly to the 43rd bit data item emergency circumstance (Emergency/Priority Status);
Step F 6, end
G, type of aircraft identifier data conversion method
Figure 12 shows that the present invention meets type of aircraft identifier data flow path switch figure in the conversion method of data format of Automatic dependent surveillance broadcast message processing request.Concrete grammar is as follows:
Step G1, read message;
Step G2, judge in the message that whether the 33rd be some integers in 1,2,3,4 to the value of the 37th bit data item TYPE, if, execution in step G3; Otherwise, execution in step G5;
The type of step G3, judgement message is Aircraft Identification and Type Message;
Step G4, can determine the type of Emitter Category according to the value of TYPE by consulting related data, the type that TYPE equals 1,2,3,4 corresponding respectively Emitter Category is D, C, B, A; The value of Emitter Category has characterized type of airplane, the corresponding value that the value of Emitter Category is converted to the type of aircraft identifier data item in the CHN21 form;
Step G5, end.
In the conversion method of ADS-B 1090 messages and CHN21 formatted data, extract and the position of aircraft contiguous items, and become the method for the data item in the CHN21 form to comprise its corresponding conversion: H, longitude and latitude data transfer device; I, height level data transfer device; J, positional precision data transfer device.
H, longitude and latitude data transfer device
Figure 13 shows that the present invention meets longitude and latitude data-switching process flow diagram in the conversion method of data format of Automatic dependent surveillance broadcast message processing request.Concrete grammar is as follows:
Step H1, read message;
Step H2, extract in the message the 33rd to the 37th data item TYPE, whether the value of judging TYPE is the some integers in 5-18 or the 20-22 interval, if, execution in step H3; Otherwise, execution in step H5;
The type of step H3, judgement message is Airborne Position Message;
Step H4, extract in the message the 55th to the 71st data item latitude (Encode Latitude) value and its corresponding conversion is become in the CHN21 form value of the 64th to the 33rd latitude data item; Extract in the message the 72nd to the 88th data item longitude (Encode Longitude) value and it is converted in the CHN21 form value of the 32nd to the 1st longitude data item accordingly;
Step H5, end.
I, height level data transfer device
Figure 14 shows that the present invention meets height level data-switching process flow diagram in the conversion method of data format of Automatic dependent surveillance broadcast message processing request.Concrete grammar is as follows:
Step I1, read message;
Whether step I2, the value of judging the 33rd to the 37th data item TYPE equal the some integers in 9-18 or the 20-22 interval, if, execution in step I3; Otherwise, execution in step I4;
The value of the 41st to the 52nd data item height (Altitude) in step I3, the extraction message, the 41st to the 52nd data item height (Altitude) has characterized barometer altitude, and the value corresponding conversion of Altitude is become the value of height level data item in the CHN21 form;
Step I4, end.
J, positional precision data transfer device
Figure 15 shows that the present invention meets position accuracy data flow path switch figure in the conversion method of data format of Automatic dependent surveillance broadcast message processing request.Concrete grammar is as follows:
Step J1, read message;
Whether step J2, the value of judging the 33rd to the 37th data item TYPE equal the some integers in 5-18 or the 20-22 interval, if, execution in step J3; Otherwise, execution in step J4;
Step J3, can determine the value of the uncertain kind of navigation position (Navigation Uncertainty Category Position is hereinafter to be referred as NUCp) by consulting related data, and the value corresponding conversion of NUCp be become the value of the positional precision data item in the CHN21 form according to the value of TYPE; If the value of TYPE is the some integers in the 5-8 interval, judge that then type of message is Surface Position Message, when the value of TYPE is respectively 5,6,7,8, the value of NUCp is respectively 9,8,7,6, then the value corresponding conversion of NUCp is become the positional precision data item in the CHN21 form; When if the value of TYPE is some integer in 9-18 or the 20-22 interval, judge that type of message is Airborne PositionMessage, when the value of TYPE is respectively 9,10,11,12,13,14,15,16,17,18,20,21,22, the value of NUCp is respectively 9,8,7,6,5,4,3,2,1,0,9,8, data item to be determined (TBD), then the value corresponding conversion of NUCp is become the value of the positional precision data item in the CHN21 form;
Step J4, end.
The present invention can handle ADS-B 1090 messages at ATC control workstation, and guarantee higher real-time and accuracy by ADS-B 1090 message datas being converted to the data of the CHN21 form that meets the ASTERIX form.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (7)
1, a kind of conversion method of data format that meets the Automatic dependent surveillance broadcast message processing request is characterized in that, comprising:
Step 1, read Automatic dependent surveillance broadcast 1090 messages;
Step 2, acquisition Data Format Transform module are received the moment of described message and the time of the airborne answering machine assembling of airborne selecting type message, the time that the moment that the Data Format Transform module is obtained described message deducts the airborne answering machine deal with data assembling of airborne selecting type message obtains the moment that the airborne answering machine of airborne selecting type obtains the GPS position data, and the moment that will the airborne answering machine acquisition of described airborne selecting type GPS position data converts the value of GPS time tag data item in China-21 type format to;
Step 3, extract in described Automatic dependent surveillance broadcast 1090 messages and the aircraft speed contiguous items, and convert this data item in China-21 type format corresponding data item; Extract in described Automatic dependent surveillance broadcast 1090 messages and aircraft sign contiguous items, and convert this data item in China-21 type format corresponding data item; And extract in described Automatic dependent surveillance broadcast 1090 messages and the position of aircraft contiguous items, and convert this data item in China-21 type format corresponding data item.
2, the conversion method of data format that meets the Automatic dependent surveillance broadcast message processing request according to claim 1, it is characterized in that, in the described step 3, extract in described Automatic dependent surveillance broadcast 1090 messages and the aircraft speed contiguous items, and the corresponding data item that this data item is converted in China-21 type format is specially:
Extract flying speed data item in the described message, and the value of this data item is converted to the value of data item corresponding in China-21 type format;
Extract vector data item in ground in the described message, and the value of this data item is converted to the value of data item corresponding in China-21 type format.
3, the conversion method of data format that meets the Automatic dependent surveillance broadcast message processing request according to claim 2, it is characterized in that, flying speed data item in the described message of described extraction, and the value that the value of this data item converts data item corresponding in China-21 type format to is specially:
Steps A 1, read described message;
The value of the 33rd to the 37th data item type judges whether the value of type is 19 in steps A 2, the described message of extraction; If the type of determining message is the aircraft speed infomational message, execution in step A3; Otherwise, execution in step A7;
Steps A 3, judge whether the value of the data item vertical speed source phase place of the 68th of described message is 1, if judge that the vertical speed rate type is an air pressure speed, execution in step A4; Otherwise, judge that the vertical speed rate type is a geometric type, execution in step A7;
Steps A 4, read the value of the data item vertical velocity signal phase place of the 69th of described message, obtain the directional data of vertical speed rate;
Steps A 5, read the value of the data item vertical speed of the 70th to 78 of described messages, obtain the speed data of pressure directions;
The value of pressure directions speed data item in value corresponding conversion Cheng Hua-21 type format of the value of steps A 6, described the 70th to the 78th the data item pressure directions speed that will obtain and the 69th data item vertical speed rate directional data;
Steps A 7, end;
And, ground vector data item in the described message of described extraction, and the value that the value of this data item converts data item corresponding in China-21 type format to is specially:
Step B1, read message;
Step B2, extract in the described message the 33rd to the 37th data item type, whether the value of judging type is the some integers in 5,6,7,8, if the type of judgement message is a scene position message, execution in step B3; Otherwise, execution in step B6;
Step B3, with the value of the corresponding data item in the 38th to the 44th value corresponding conversion Cheng Hua-21 type format of data item displacement in the described message;
The value of the 45th data item track cornet mark position judges whether the 46th to 52 data item track angle is available in step B4, the described message of extraction, if, execution in step B5, otherwise, execution in step B6;
Step B5, with the value of the corresponding data item in the 46th to the 52nd value corresponding conversion Cheng Hua-21 type format at data item track angle in the described message;
Step B6, end.
4, the conversion method of data format that meets the Automatic dependent surveillance broadcast message processing request according to claim 3, it is characterized in that, in the described step 3, extracts in described Automatic dependent surveillance broadcast 1090 messages and identify contiguous items, and the corresponding data item that this data item is converted in China-21 type format is specially with aircraft:
Extract destination address data item in the described message, and the value of this data item is converted to the value of data item corresponding in China-21 type format;
Extract target identification data item in the described message, and the value of this data item is converted to the value of data item corresponding in China-21 type format;
Extract target reporting identification data item in the described message, and the value of this data item is converted to the value of data item corresponding in China-21 type format;
Extract dbjective state data item in the described message, and the value of this data item is converted to the value of data item corresponding in China-21 type format;
Extract type of aircraft identifier data item in the described message, and the value of this data item is converted to the value of data item corresponding in China-21 type format.
5, the conversion method of data format that meets the Automatic dependent surveillance broadcast message processing request according to claim 4, it is characterized in that, destination address data item in the described message of described extraction, and the value that the value of this data item converts data item corresponding in China-21 type format to is specially:
Step C1, read described message;
The value of the 9th to the 32nd data item address obtains the destination address code in step C2, the described message of extraction;
Step C3, extract described destination address data item, and with the value of the destination address code data item in value corresponding conversion Cheng Hua-21 type format of this data item;
Step C4, end;
And, target identification data item in the described message of described extraction, and the value that the value of this data item converts data item corresponding in China-21 type format to is specially:
Step D1, read described message;
The value of the 33rd to the 37th bit data item type judges whether the value of type is 1,2,3,4 one of them integer, if determine that type of message is an aircraft classification message, execution in step D3 in step D2, the described message of extraction; Otherwise, execution in step D6;
The value of the 41st to the 88th data item feature 1-8 in step D3, the described message of extraction;
The 41st to the 88th data item feature 1-8 in step D4, the described message of decoding;
Step D5, extract the value of described the 41st to the 88th data item feature 1-8, and with the value of the target identification data item in value corresponding conversion Cheng Hua-21 type format of this data item;
Step D6, end;
And, target reporting identification data item in the described message of described extraction, and the value that the value of this data item converts data item corresponding in China-21 type format to is specially:
Step e 1, read described message;
The 33rd value in step e 2, the described message of extraction to the 37th bit data item type, if the value of type equals any one integer in 9-18 or the 20-22 interval, the type of then judging message is the position of aircraft message, execution in step E6; If the value of type equals any one integer among the 1-4, the type of then judging message is an aircraft classification message, execution in step E7; Simultaneously, if the value of type equals 2, the type of then judging message is an aircraft classification message, and execution in step E3 finishes;
Step e 3, judge in the message whether the value of the 6th to the 8th data item type of aircraft is 3, if, execution in step E4; Otherwise, execution in step E5;
The value of step e 4, type of aircraft is 3, and the value that the 12nd data item monitor message is originated in the target reporting identification data item in China's-21 type formats is set to 1 accordingly, finishes;
If the value of step e 5 type of aircraft is not 3, the value that the 12nd data item monitor message is originated in the target reporting identification data item in China's-21 type formats is set to 0 accordingly, finishes;
Step e 6, determine in China's-21 type format target reporting identification data item according to the 48th the value of the minimum effective value zone bit of data item in the 38th to the 39th value of data item monitor message state in the message and the message to finish the value of the 10th the value of data item special position identification data item and the 5th 's to the 4th data item height alert capability;
Step e 7, extract in the message value of the 6th to the 8th data item type of aircraft, and, finish the 6th to the 8th the value of data item address classes in the target reporting identification data item in value corresponding conversion Cheng Hua-21 type format of this data item;
And, dbjective state data item in the described message of described extraction, and the value that the value of this data item converts data item corresponding in China-21 type format to is specially:
Step F 1, read described message;
Step F 2, judge whether the 33rd value to the 37th bit data item type is 28 in the described message, if judge that the type of message is the aircraft state message, execution in step F3; Otherwise, execution in step F5;
Step F 3, judge in the described message whether the value of the 38th to the 40th data item subtype is 1, if, execution in step F4; Otherwise, execution in step F5;
Step F 4, extract in the described message value of the 41st to the 43rd the data item emergency circumstance, and the value of this data item is converted accordingly to the value of the dbjective state data item in China-21 type format;
Step F 5, end;
And, type of aircraft identifier data item in the described message of described extraction, and the value that the value of this data item converts data item corresponding in China-21 type format to is specially:
Step G1, read described message;
Step G2, judge in the described message that whether the 33rd be some integers in 1,2,3,4 to the value of the 37th bit data item type, if judge that the type of message is an aircraft classification message, execution in step G3; Otherwise, execution in step G4;
Step G3, determine the value of aircraft categorical data item according to the value of described type, the corresponding value that the value of aircraft categorical data item is converted to the type of aircraft identifier data item in China-21 type format;
Step G4, end.
6, the conversion method of data format that meets the Automatic dependent surveillance broadcast message processing request according to claim 5, it is characterized in that, in the described step 3, extract in described Automatic dependent surveillance broadcast 1090 messages and the position of aircraft contiguous items, and the corresponding data that this data item is converted in China-21 type format is specially:
Extract longitude and latitude data item in the described message, and the value of this data item is converted to the value of data item corresponding in China-21 type format;
Extract height level data item in the described message, and the value of this data item is converted to the value of data item corresponding in China-21 type format;
Extract accuracy data item in position in the described message, and the value of this data item is converted to the value of data item corresponding in China-21 type format.
7, the conversion method of data format that meets the Automatic dependent surveillance broadcast message processing request according to claim 6, it is characterized in that, longitude and latitude data item in the described message of described extraction, and the value that the value of this data item converts data item corresponding in China-21 type format to is specially:
Step H1, read described message;
Step H2, read in the described message the 33rd to the 37th data item type, judge whether the value of type is any one integer in 9-18 or the 20-22 interval, if judge that the type of message is the position of aircraft message, execution in step H3; Otherwise, execution in step H4;
Step H3, extract in the described message value of the 55th to the 71st data item latitude, and with the value of the latitude data item in value corresponding conversion Cheng Hua-21 type format of this data item; Extract in the described message value of the 72nd to the 88th data item longitude, and the value of this data item is converted to accordingly the value of the longitude data item in China-21 type format;
Step H4, end;
And, height level data item in the described message of described extraction, and the value that the value of this data item converts data item corresponding in China-21 type format to is specially:
Step I1, read described message;
Step I2, judge in the described message whether the value of the 33rd to the 37th data item type equals any one integer in 9-18 or the 20-22 interval, if, execution in step I3; Otherwise, execution in step I4;
Step I3, extract in the described message value of the 41st to the 52nd data item height, and with the value of the height level data item in value corresponding conversion Cheng Hua-21 type format of this data item;
Step I4, end;
And, position accuracy data item in the described message of described extraction, and the value that the value of this data item converts data item corresponding in China-21 type format to is specially:
Step J1, read described message;
Step J2, judge in the described message whether the value of the 33rd to the 37th data item type equals any one integer in 5-18 or the 20-22 interval, if, execution in step J3; Otherwise, execution in step J4;
Step J3, determine the value of the uncertain kind of navigation according to the value of described type, and with the value of the positional precision data item in value corresponding conversion Cheng Hua-21 type format of the uncertain kind of described navigation;
Step J4, end.
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| CN104091471B (en) * | 2014-07-08 | 2016-03-16 | 北京东进航空科技股份有限公司 | The monitoring control communication means of monitoring control terminal, flight path target and system |
| CN104537894A (en) * | 2014-12-22 | 2015-04-22 | 中电科航空电子有限公司 | Distributed low-altitude flight service system and working method thereof |
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