CN104954063A - ADS-B (Automatic Dependent Surveillance-Broadcast) data fusion method and system - Google Patents
ADS-B (Automatic Dependent Surveillance-Broadcast) data fusion method and system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
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- H04B7/185—Space-based or airborne stations; Stations for satellite systems
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Abstract
The invention provides an ADS-B (Automatic Dependent Surveillance-Broadcast) data fusion method and system. The method comprises steps as follows: 1, all ADS-B data related to a specified target are acquired; 2, all data of the specified target are grouped according to preset attribute; 3, grouped data sets obtained after grouping are sequenced according to data groups; 4, whether data meeting requirements of the specified target are contained in a current data group in the grouped data sets obtained after grouping is judged sequentially, if yes, the step 5 is executed, and otherwise, whether required data are contained in the next data set in the grouped data sets is judged; 5, fusedata of the specified target are output from the current data set. Therefore, ADS-B data can be rapidly fused in the grouped data sets.
Description
Technical field
The present invention relates to a kind of technical field of air traffic control, particularly relate to a kind of ADS-B data and merge method and system thereof.
Background technology
Along with the sustainable development of Chinese Aviation Transportation industry, flight flow increases day by day, and traditional monitoring facility and technology can not meet the demand of air traffic control fast development well because of defects such as its precision are low, coverage rate is narrow, operating cost is high, fail safe is not enough.Automatic dependent surveillance broadcast (Automatic Dependent Surveillance-Broadcast, ADS-B) on, machine high by means of data updating rate and air information enrich, make it possess outstanding advantage at everyways such as accuracy, reliability, integrality and operation costs, become the important component part in new navigation system.
Because ADS-B system is better than conventional radar technology, so ADS-B technology has become the technological trend of generally acknowledging both at home and abroad, the research of ADS-B technology has also more and more come into one's own.Such as, be in the patent application of CN200910081086.4 in Chinese Patent Application No., disclose a kind of flight path processing method and apparatus of Automatic dependent surveillance broadcast.The method comprises the message information receiving the aircraft transmission being equipped with ADS-B equipment, the track documents that each aircraft of initialization is corresponding; When message information is velocity information, upgrade track documents corresponding to each aircraft by velocity information; When message information is positional information, by the track documents that each aircraft of updating location information is corresponding; Arrange the track documents after upgrading, keep real-time update to make track documents; The flight path processing of ADS-B system can be realized like this, and ensure the continuity of flight path processing, correctness and real-time.
Another part of Chinese Patent Application No. is in the patent application of CN201210595722.7, disclose a kind of for destroying message at multipath transmisstion or stoping the system and method receiving ADS-B message in the environment of the reception of message, this system in conjunction with RF signal transacting and Digital Signal Processing with make it possible to exist near structure and/or farther structure multipath reflection situation under receive ADS-B message, the aerial array at system usage level interval, combine the RF signal from antenna by receiver thus form one group of wave beam with different azimuth antenna pattern to be increased at least one wave beam the probability non-destructively in conjunction with multipath and sight line path, can effectively removes multipath reflection like this, wherein, the delay of the relative sight line path of multipath is less than 100-200 nanosecond.System is also configured to remove the multipath reflection that relative sight line path has larger delay.
Technique scheme, although allow ADS-B system can monitor the various information of target in air traffic control service better; But inventor is realizing finding, when receiving the data of multiple ADS-B ground station, may there is following several situation in process of the present invention:
1, may from several ADS-B ground station reception to the ADS-B data of same airborne vehicle.
2, may receive in different time points the data about same airborne vehicle synchronization broadcast that different ADS-B ground station transmits.
3, synchronization receives the broadcast data that the data about same airborne vehicle that different ADS-B ground station transmits may not be synchronizations.
4, receive the data about same airborne vehicle synchronization that different ADS-B ground station is transmitted, in these data, most data item is that airborne vehicle broadcasts out, and under normal circumstances, the value of encapsulation is consistent in each ADS-B ground station; But a small amount of data item such as time is that ground station generates and encapsulates, so these data item may have some differences.But consider that each ADS-B ground station all to carry out the situation such as synchronous with gps time, therefore, even if these data item are variant, also in a very little scope.
These situations above-mentioned may cause ADS-B packet data convergence to have repetition and out-of-date data, so not only have impact on the transmission speed of ADS-B data, also add the complexity that user uses ADS-B data.
Summary of the invention
In order to solve the above-mentioned technical problem existed in prior art, the invention provides a kind of ADS-B data can merged several data and merging method and system thereof.
Technical scheme provided by the invention is:
On the one hand, provide a kind of ADS-B data to merge method, it is characterized in that, comprising:
(1), from the data that a new round receives obtain all ADS-B data about specific objective, described data comprise markers, longitude and latitude about specific objective, and in described data, latitude and longitude information can be mapped as range information;
(2), by all data of specific objective divide into groups according to predetermined attribute, described predetermined attribute at least comprises markers corresponding to data and distance; And the attribute difference of data is in predetermined scope, just described data are divided into a data group; Wherein, at least one data group forms grouped data collection;
(3), the grouped data collection after grouping is sorted according to data group; Wherein, each data group is provided with a timestamp, and time stamp setting to become in this data group markers time parameter the earliest in all data;
(4) judge the packet data convergence after grouping, successively, in current data group, whether have satisfactory data about the data of described specific objective; If there are satisfactory data, then perform step (five); If there is no satisfactory data, then judge whether next group data group of packet data convergence has satisfactory data, if there are satisfactory data, then performs step (five) successively, if packet data convergence does not all have satisfactory data, end data is merged;
(5) what from current data group, export specific objective merges data.
Preferably, elevation information can also be comprised in described data, when elevation information is available, described predetermined setup of attribute becomes to comprise markers corresponding to data and distance, and be designated as 0.2 second when predetermined scope is arranged in step (two), distance is 100 meters, be highly 10 meters; When in described data, elevation information is unavailable, described predetermined setup of attribute becomes to comprise markers corresponding to data and distance, and be designated as 0.2 second when predetermined scope is arranged in step (two), distance is 50 meters.
Preferably, step (two) also needs to judge that whether current data is out-of-date before dividing into groups according to predetermined attribute to all data of specific objective; The mode judged is: if specific objective has had ADS-B track data, then obtain the markers of latest data in described ADS-B flight path, if the markers of described latest data is not less than the markers of data in step (), the data obtained in determination step () are outdated data; Otherwise the data obtained in determination step () are not outdated datas.
Preferably, sort according to data source state score height in the inside that step (four) is also included in each data group, and step (four) also comprises and undesirable data of originating in each data group being given up.
Preferably, carrying out sort method to the grouped data collection after grouping according to data group in step (three) is the data group in timestamp evening come before timestamp data group early.
Preferably, step (five) also comprises: data item corresponding for first data given from satisfactory current data group and merge data; Then judge that whether the data item of merging data is complete; If complete, then directly export and merge data; If incomplete, then shift out next data successively from current data group, and the lacuna of merging data by having in next data is updated to and merges in data item corresponding to data.
A kind of ADS-B data merge system, and it is characterized in that, described ADS-B data are merged system and comprised:
Data capture unit, extracts the data of specific objective according to 24 bit address codes in ADS-B data;
Data packet units, the ADS-B data of the specific objective that described data capture unit can be obtained are divided into groups according to particular community; The attribute of described packet at least comprises the markers of data, the longitude and latitude of data, and in described data, latitude and longitude information can be mapped as distance; Grouped data collection after grouping is sorted according to data group; Wherein, each data group is provided with a timestamp, and time stamp setting to become in this data group markers time parameter the earliest in all data;
Data processing unit, based on data source state, removes undesirable data; And can obtain merging data from described packet data convergence data group;
Data outputting unit, the data of merging obtained by described data processing unit export.
Preferably, often to organize in described data packet units in data the earliest time be designated as the timestamp of described group, in described data packet units, data are according to the timestamp ordering of described group, and timestamp one group of data the latest come the foremost of data storage cell.
Preferably, described ADS-B data are merged system and are also provided with timestamp detecting unit, and whether the ADS-B data obtained for detecting described data capture unit are outdated data.
Preferably, be also provided with in described data processing unit and judge to merge the whether complete data item detecting unit of the data item of data.
Adopt technique scheme provided by the invention, can at least obtain following beneficial effect:
1, by specific objective not in the same time, all data of obtaining of different ADS-B grounded receiving station first divide into groups, the data of such specific objective synchronization are classified as one group, obtain each group of data that specific objective is not corresponding in the same time rapidly; Then export rapidly and merge data.
2, when packet data convergence data group is divided into groups, the data group in timestamp evening is come before timestamp data group early; If data meet the requirements in the data group in such timestamp evening, can first as merge data, and the data that the data in timestamp evening are corresponding up-to-date, so up-to-date ADS-B data can be exported in time.
3, the data after grouping are sorted according to the order of timestamp, be more prone to the data judging synchronization in different ADS-B grounded receiving station like this, and can judge that whether the data of packet data convergence are out-of-date fast according to timestamp, can out-of-date data be abandoned like this.
4, the data item of data can be judged to merge whether complete and adopt to merging data lacuna in data the mode inherited, make to export to merge data item more true, reliable.
Accompanying drawing explanation
Fig. 1 merges the flow chart of method for a kind of ADS-B data that the embodiment of the present invention one provides;
Fig. 2 merges the flow chart to packet in method for a kind of ADS-B data that the embodiment of the present invention one provides;
Fig. 3 merges the flow chart to data processing in method for a kind of ADS-B data that the embodiment of the present invention one provides;
Fig. 4 merges the structured flowchart of system for a kind of ADS-B data that the embodiment of the present invention one provides;
The schematic diagram of a kind of target data that Fig. 5 provides for the embodiment of the present invention one;
Fig. 6 is the schematic diagram to target data grouping in Fig. 5;
Fig. 7 is the schematic diagram to target data sequence after grouping in Fig. 6;
Fig. 8 merges the flow chart to data processing in method for a kind of ADS-B data that the embodiment of the present invention two provides.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail, it should be noted that, these specific descriptions just allow those of ordinary skill in the art be more prone to, clearly understand the present invention, but not limitation of the invention is explained.
Embodiment one
As shown in Figure 1, the present embodiment provides a kind of ADS-B data to merge method to comprise:
The particular data that S0, an acquisition new round receive, from the data that a new round receives, namely obtain all data about specific objective, the source of these data comes from least one ADS-B grounded receiving station; These data can comprise markers, longitude and latitude about specific objective, and in described data, latitude and longitude information can be mapped as range information.Wherein, specific target refers to any one target that can receive for ADS-B grounded receiving station in all targets here, and in order to express easily, the present embodiment supposes that this specific target is A.
Preferably, target is navigated pocket, and airborne vehicle generates accurate locating information according to Airplane Navigation Equipment and GNSS (GPS (Global Position System), the abbreviation of Global Navigation Satellite System) navigation system, then by locating information Auto broadcast out; And ADS-B ground station receives this information by aeronautical data chain, after a series of process, by ADS-B transfer of data out.Each airborne vehicle has 24 bit address codes, the description according in ICAO annex 10 the 3rd volume the 9th chapter: " whenever, all can not there is the airborne vehicle that 24 bit address are allocated to more than 1 ", thus ensured the uniqueness of 24 bit address codes; Point out that in ADS-B data, 24 bit address codes are the data item that must fill out in the standard of the ADS-B transmission of messages form that Europe control is issued.So the data of same target can be identified according to 24 bit address codes in ADS-B data.Therefore, this can take turns the data of reception with the 24 bit address codes of target A successively comparison, and therefrom find target A and should take turns the data received.
S1, packet, all data of specific objective are divided into groups according to predetermined attribute by the process need of packet, and this predetermined attribute at least comprises markers corresponding to data, longitude and latitude, and in data, latitude and longitude information can be mapped as range information; And the attribute difference of data is in predetermined scope, just these data are divided into a data group; Wherein, at least one data group forms grouped data collection (also can be target data set of packets).
Particularly, the data source of the target A that S0 receives is from different ADS-B data sources, and because of the reason such as transmission link, transmission range, these data may be that the information that target A broadcasts in different time points gets after data source process.So these data divided into groups, form grouped data collection (group), make the data of same group be the information that target A synchronization is broadcasted as far as possible, and the data similarity of same group is high.
Packet handling process as shown in Figure 2, comprising:
S11, judge that whether about the data set of target A be empty; If so, then S18 is performed; If not, then perform S12.
S12, shift out data, in order to express easily, suppose that these data are b.
S13, judge that whether grouped data collection is empty, grouped data collection here just refers in S0, and data group forms grouped data collection; If so, then step S16 is performed; If not, then perform step S14.
S14, find the grouping similar with data b in packet data convergence.
S15, judge whether to find similar grouping, if do not found, then perform step S16; If have found, then perform step S17; Preferably, search the method for similar grouping: travel through current grouped data collection (group) successively, judge the similarity of data b and each grouping.Because the data similarity in same grouping is high, in each desirable each grouping, data compare with data b, in order to express easily, suppose that in grouping, data are c, then judge the similarity of data c and data b:
1. the distance shown in calculated data c longitude and latitude and data b longitude and latitude between two points, is designated as: f (data c longitude and latitude, data b longitude and latitude).
One of 2. meet the following conditions, then think that data c is similar with data b:
A, when the elevation information of data c and data b can be used:
| the markers of the markers-data b of data c | <=0.2 second, and | the distance of the distance-data b of data c |=f (data c longitude and latitude, data b longitude and latitude) <=100 rice, and | the height of the height-data b of data c | <=10 rice
B, in the disabled situation of the elevation information of data c and data b:
| the markers of the markers-data b of data c | <=0.2 second, and f (data c longitude and latitude, data b longitude and latitude) <=50 rice.
S16, add data b to grouped data collection as new grouped data, then perform S11;
S17, using the member of data b as similar grouping, by the packet that data b adds data c place to, then perform S11.
S18, end.
S2, sort between the grouping of packet data convergence, each grouping is provided with a timestamp, and its timestamp to be arranged in this grouping in all data that timestamp the earliest.
S3, based on data source state status, process grouped data successively, judge whether there are satisfactory data about the data of this specific objective in current data group; If there are satisfactory data, then perform step S4; If there is no satisfactory data, then judge whether next group data group of packet data convergence has satisfactory data;
Preferably, judge that the whether satisfactory method of data is: judge that whether the source of data is normal, and the source of data is ground stations, if so derive from undesirable ground station, then the reliability of these data just has problem, then should reject these data;
S4, from current data group, export specific objective merge data.
Preferably, in step S3 in each data group, by the data of its inside, sort according to data source state score height; And undesirable data of originating in each data group are given up.
Preferably, carrying out sort method to the grouped data collection after grouping according to data group in step S2 is the data group in timestamp evening come before timestamp data group early.
Preferably, in step S3, if take turns grouped data collection to one all do not got satisfactory data, then abandon the data that this packet data convergence is all.
As shown in Figure 3, the detailed process of step S3 and step S4 comprises:
S31, judge that whether grouped data collection is empty, if so, then perform S41, if not, then perform S32.
S32, shift out a data group (or claim grouping), in order to express easily, suppose that the data group shifted out is g.
S33, judge that the data of g are whether true, if truly, then perform S34; Otherwise, perform S31;
S34, according to data source state score to data group g (or claim grouping g) in data sorting, remove the data that undesirable data source is corresponding.With reference to the state status of each data source, according to data source state score to the data sorting in grouping g, the data that state is better come more, give up the data that the undesirable data source of state is corresponding; Can realize the data of dividing into groups in g is like this all satisfactory quality, and sorts successively by quality height.
In order to the technical scheme provided the present embodiment has understanding clearly, below in conjunction with a concrete example, method is merged to ADS-B data and set forth, but this example not limits target data, packet, packet sequencing etc.
As shown in Figure 5, certain target data that a new round receives is obtained: supposing that this is taken turns the data receiving target A and has 10, is data 1 ~ data 10 respectively.
As shown in Figure 6, according to similarity degree, these 10 data are divided into groups, wherein out-of-date data are discarded, tentation data 8 is out-of-date, remaining 9 data have been divided into 3 groups, and the data similarity of same group is high, most likely the data that broadcast out of target synchronization.
Sort to these 3 groupings according to the method described above, coming the most front should be up-to-date data, supposes that ranking results as shown in Figure 7.
Next, the data that priority treatment is up-to-date, so priority treatment grouping 2, judge its source of 3 data whether normal (by means of data source state status information) in grouping 2, the source of tentation data 4 does not meet the normal requirement used, and the source of data 2, data 10 meets the normal requirement used, then from grouping 2, remove data 4, use remaining data 2, data 10 carry out data and merge, obtain merging data (fusedata).Because obtained merging data, so can end operation, without reprocessing grouping 1, grouping 3.Otherwise, if the source of the data 2 in grouping 2, data 4, data 10 does not all meet the normal requirement used, all remove from grouping 2, then do not have suitable data to merge in grouping 2, then continue process grouping 1 by the same way.
In like manner, if the data in grouping 1 have meet the demands, export and merge data (fusedata), then end operation, without reprocessing grouping 3; If the data in grouping 1 do not meet the demands, all remove from grouping 1, then do not have suitable data to merge in grouping 1, then continue process grouping 3 by the same way.
In like manner, if the data in grouping 3 have meet the demands, export and merge data (fusedata), then end operation; If the data in grouping 3 do not meet the demands, all remove from grouping 3, then suitable data are not had to merge in grouping 3, follow-up do not have other to divide into groups yet, then illustrate that target A should take turns 10 data received and not meet the demands, abandon these data, do not merge and to merge data (fusedata).
On the other hand, as shown in Figure 4, the present embodiment also provides a kind of ADS-B data to merge system 1 to comprise:
Data capture unit 2, extracts the data of specific objective according to 24 bit address codes in ADS-B data;
Data packet units 3, the ADS-B data of the specific objective that data capture unit can be obtained are divided into groups according to particular community; The attribute of packet at least comprises the markers of data, the longitude and latitude of data, and in data, latitude and longitude information can be mapped as distance; Grouped data collection after grouping is sorted according to data group; Wherein, each data group is provided with a timestamp, and time stamp setting to become in this data group markers time parameter the earliest in all data;
Data processing unit 4, based on data source state, removes undesirable data; And can obtain merging data from packet data convergence data group;
Data outputting unit 5, the data of merging obtained by data processing unit export.
Preferably, often to organize in data packet units in data the earliest time be designated as the timestamp of group, in data packet units, data are according to the timestamp ordering of group, and timestamp one group of data the latest come the foremost of data storage cell.
Preferably, the attribute of this packet at least comprises markers and the distance of data; And often to organize in this data storage cell in data the earliest time be designated as the timestamp of this group, in this data storage cell, data are according to the timestamp ordering of this group, and timestamp one group of data the latest come the foremost of data storage cell.
Preferably, these ADS-B data are merged system and are also provided with data time stamp detecting unit, and whether the ADS-B data obtained for detecting data capture unit are outdated data.
The technique scheme adopting the present embodiment to provide, can at least obtain following beneficial effect:
1, by specific objective not in the same time, all data of obtaining of different ADS-B grounded receiving station first divide into groups, the data of such specific objective synchronization are classified as one group, obtain each group of data that specific objective is not corresponding in the same time rapidly, then export rapidly and merge data.
2, when packet data convergence data group is divided into groups, the data group in timestamp evening is come before timestamp data group early; If data meet the requirements in the data group in such timestamp evening, can first as merge data, and the data that the data in timestamp evening are corresponding up-to-date, so up-to-date ADS-B data can be exported in time.
3, the data after grouping are sorted according to the order of timestamp, be more prone to the data judging synchronization in different ADS-B grounded receiving station like this, and can judge that whether the data of packet data convergence are out-of-date fast according to timestamp, can out-of-date data be abandoned like this.
Embodiment two
The present embodiment, on the basis of previous embodiment, is optimized the data process of merging further, particularly, as shown in Figure 8, adds step relative to embodiment one:
S35, judge data group g (or claim grouping to be g) whether empty, if so, then perform step S31, if not, then perform S36.
Data (fusedata) are merged in S36, initialization, and all data item are all empty; Be assigned to by the data item that these data exist and merge data item corresponding to data.
Whether S37, judge to merge data and think complete, if complete, merging data (fusedata) is then that final data of merging then perform S41; Otherwise, perform S38.
S38, judge grouping g whether also there are other data, if do not had, then perform S41; Otherwise, perform S39.
S39, from grouping g shift out data, in order to express easily, be assumed to be a; Perform S40.
S40, merge data and from data a, inherit the lacuna of merging data and the data item existed in data a.
Preferably, ADS-B data are merged in the data processing unit 4 of system to be also provided with and are judged to merge the whether complete data item detecting unit of the data item of data.
Adopt the technical scheme in the present embodiment, equally for Fig. 5 ~ Fig. 7 data carry out remittance melt time, be with embodiment one difference, the method sorted in each data group is comprised: the data of 3 in grouping 2 are sorted according to data source state status, the data that state is better come more, give up the data that Data Source does not meet the normal requirement used, suppose that according to the result of Data Source state sequence be data 10, data 2, data 4, wherein the source of data 4 does not meet the normal requirement used, data 2, the source of data 10 meets the normal requirement used, then data 4 are removed from grouping 2, so just be left 2 data in grouping 2, be followed successively by data 10, data 2, then merge: data (fusedata) are merged in initialization, the data item making them all is for empty, priority treatment data 10 are (because the source status of data 10 is best, come foremost), data item corresponding to data (fusedata) is merged so be assigned to by the data item of data 10 correspondence, whether the data item that data (fusedata) are merged in inspection is complete, if complete, merging data (fusedata) is then final merge data, process terminates, otherwise fetch data 2 successively, merge data (fusedata) and from data 2, inherit the lacuna of merging data (fusedata) and the data item that exists in data 2, because there is no other satisfactory data of originating below, then process terminates, obtain merging data (fusedata).Because obtained merging data (fusedata), then end operation, without reprocessing grouping 1, grouping 3.Otherwise if the source of the data 2 in grouping 2, data 4, data 10 does not all meet the normal requirement used, all remove from grouping 2, then 2 changes of dividing into groups are empty, do not have data to merge, then continue process grouping 1 by the same way and divide into groups 3.
Whether adopt the technique scheme that provides of the present embodiment, it is complete and adopt to merging data lacuna in data the mode inherited to judge to merge the data item of data, make to export to merge data item more true, reliable.
Finally it should be noted that, above-mentioned explanation is only most preferred embodiment of the present invention, not does any pro forma restriction to the present invention.Any those of ordinary skill in the art; do not departing within the scope of technical solution of the present invention; the way of above-mentioned announcement and technology contents all can be utilized to make many possible variations and simple replacement etc. to technical solution of the present invention, and these all belong to the scope of technical solution of the present invention protection.
Claims (10)
1. ADS-B data merge a method, it is characterized in that, described ADS-B data are merged method and comprised:
(1), from the data that a new round receives obtain all ADS-B data about specific objective, described data can comprise markers about specific objective and longitude and latitude, and in described data, latitude and longitude information can be mapped as range information;
(2), by all data of specific objective divide into groups according to predetermined attribute, described predetermined attribute at least comprises markers corresponding to data and distance; And the attribute difference of data is in predetermined scope, just described data are divided into a data group; Wherein, at least one data group forms grouped data collection;
(3), the grouped data collection after grouping is sorted according to data group; Wherein, each data group is provided with a timestamp, and time stamp setting to become in this data group markers time parameter the earliest in all data;
(4) judge the packet data convergence after grouping, successively, in current data group, whether have satisfactory data about the data of described specific objective; If there are satisfactory data, then perform step (five); If there is no satisfactory data, then judge whether next group data group of packet data convergence has satisfactory data, if there are satisfactory data, then performs step (five) successively, if packet data convergence does not all have satisfactory data, end data is merged;
(5) what from current data group, export specific objective merges data.
2. ADS-B data as claimed in claim 1 merge method, it is characterized in that, elevation information can also be comprised in described data, when elevation information is available, described predetermined setup of attribute becomes to comprise markers corresponding to data and distance, and be designated as 0.2 second when predetermined scope is arranged in step (two), distance is 100 meters, be highly 10 meters; When in described data, elevation information is unavailable, described predetermined setup of attribute becomes to comprise markers corresponding to data and distance, and be designated as 0.2 second when predetermined scope is arranged in step (two), distance is 50 meters.
3. ADS-B data as claimed in claim 1 merge method, it is characterized in that, step (two) also needs to judge that whether current data is out-of-date before dividing into groups according to predetermined attribute to all data of specific objective; The mode judged is: if specific objective has had ADS-B track data, then obtain the markers of latest data in described ADS-B flight path, if the markers of described latest data is not less than the markers of data in step (), the data obtained in determination step () are outdated data; Otherwise the data obtained in determination step () are not outdated datas.
4. ADS-B data as claimed in claim 1 merge method, it is characterized in that, sort according to data source state score height in the inside that step (four) is also included in each data group, and step (four) also comprises and undesirable data of originating in each data group being given up.
5. ADS-B data as claimed in claim 1 merge method, it is characterized in that, carrying out sort method to the grouped data collection after grouping according to data group in step (three) is the data group in timestamp evening come before timestamp data group early.
6. ADS-B data as claimed in claim 1 merge method, and it is characterized in that, step (five) also comprise: data item corresponding for first data given from satisfactory current data group and merge data; Then judge that whether the data item of merging data is complete; If complete, then directly export and merge data; If incomplete, then shift out next data successively from current data group, and the lacuna of merging data by having in next data is updated to and merges in data item corresponding to data.
7. ADS-B data merge a system, it is characterized in that, described ADS-B data are merged system and comprised:
Data capture unit, extracts the data of specific objective according to 24 bit address codes in ADS-B data;
Data packet units, the ADS-B data of the specific objective that described data capture unit can be obtained are divided into groups according to particular community; The attribute of described packet at least comprises the markers of data, the longitude and latitude of data, and in described data, latitude and longitude information can be mapped as distance; Grouped data collection after grouping is sorted according to data group; Wherein, each data group is provided with a timestamp, and time stamp setting to become in this data group markers time parameter the earliest in all data;
Data processing unit, based on data source state, removes undesirable data; And can obtain merging data from described packet data convergence data group;
Data outputting unit, the data of merging obtained by described data processing unit export.
8. ADS-B data as claimed in claim 7 merge system, it is characterized in that, often to organize in described data packet units in data the earliest time be designated as the timestamp of described group, in described data packet units, data are according to the timestamp ordering of described group, and timestamp one group of data the latest come the foremost of data storage cell.
9. ADS-B data as claimed in claim 7 merge system, and it is characterized in that, described ADS-B data are merged system and are also provided with timestamp detecting unit, and whether the ADS-B data obtained for detecting described data capture unit are outdated data.
10. ADS-B data as claimed in claim 7 merge system, it is characterized in that, are also provided with the data item the detecting unit whether data item that judges to merge data is complete in described data processing unit.
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