CN108122433A - The method and system of secondary radar answering machine code duplicate allocation - Google Patents
The method and system of secondary radar answering machine code duplicate allocation Download PDFInfo
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- CN108122433A CN108122433A CN201711475733.0A CN201711475733A CN108122433A CN 108122433 A CN108122433 A CN 108122433A CN 201711475733 A CN201711475733 A CN 201711475733A CN 108122433 A CN108122433 A CN 108122433A
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G5/00—Traffic control systems for aircraft, e.g. air-traffic control [ATC]
- G08G5/0043—Traffic management of multiple aircrafts from the ground
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Abstract
The present invention provides a kind of method and system of secondary radar answering machine code duplicate allocation, wherein, method includes, and judges whether the time difference of code flight ETD times to be matched somebody with somebody and current time is equal to default first time length；When the time difference being equal to first time length, judge whether code flight to be matched somebody with somebody has obtained clearance license；When clearance license is obtained with code flight, SSR codes are distributed for code flight to be matched somebody with somebody.The method and system of secondary radar answering machine code duplicate allocation provided by the invention, after flight grants clearance by control department, the inspections such as interface point condition that goes out that purpose information area, flight with reference to flight fly away from this control is realized automatically as flight duplicate allocation SSR codes.So, it can be achieved that efficiently using for SSR code resources, greatly reduces " sky accounts for " SSR code phenomenons, the degree of safety of entire control work can be improved.
Description
Technical field
The present invention relates to air traffic control technical field more particularly to a kind of secondary radar answering machine code duplicate allocations
Method and system.
Background technology
Air Traffic Control Automation System (Air Traffic Control System, ATC system) is handed over for aerial
Logical controller grasps airflight situation, the most important technical tool for implementing air traffic control in real time.Airborne secondary radar should
It is to carry out automatic-answering back device to ground secondary radar request signal to answer machine (Secondary Surveillance Radar, SSR)
A kind of equipment is the important evidence that aircraft is identified in radar control, in radar control sector, airborne secondary radar answering machine generation
Code identification is that aircraft identification is main, most common method.Before flight takeoff, the ATC system of control unit is automatically
Flight distributes its this airborne secondary radar answering machine code (Secondary Surveillance Radar to be used that fly
Code, SSR code), and flight fly out this regulatory area compass of competency after, ATC system automatically recycles this SSR code.
The whole world shares 4096 SSR codes at present, wherein distribute to the code that China Civil Aviation uses share 1663 (including
Borrow each 64 of the SSR codes of Australia and Burma), and which part code is distributed to army's boat addition air route airline operation and is appointed
It make sures use.Each regulatory area of distributing to that the available SSR code resources of China Civil Aviation are static at present uses, each regulatory area energy
The SSR code quantities used are limited, and in the SSR code segment resources for distributing to oneself SSR codes can only be selected to distribute to boat
Class uses.It is increasing per Daily variation flight amount with the rapid development of China Civil Aviation, in the case of actual motion,
The big regulatory area of each flight amount, often there is a situation where whole SSR code resources all using finishing.
In conventional solution, ATC system is in flight E.T.D(estimated time of departure) (Estimated Time of
Departure, ETD) before T minutes (parameter, usually between 20~60 minutes) distribute SSR codes automatically for flight.
To sum up, existing secondary radar answering machine code distribution mechanism has a defect that：Distribute the time machine of SSR codes
It makes unreasonable, distributes SSR codes according to the flight set ETD times always, cause when flight amount of leaving the port is more, it is many actual
The flight that there is no the clearance license of control department distributes the time conditions of SSR codes because ETD meets in advance, and by ATC
System is assigned with SSR codes automatically, causes " sky accounts for " SSR code situations, and SSR code resources is caused to waste.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of secondary radar answering machine code duplicate allocation method and be
System, enables ATC system in the case where flight amount of leaving the port is big, and more scientific, reasonably automatic is that the flight to leave the port distributes secondary thunder
Up to answering machine code, the degree of safety that entire control works is improved.
In order to solve the above technical problems, technical solution provided by the invention is：
On the one hand, the present invention provides a kind of method of secondary radar answering machine code duplicate allocation, including,
Judge whether the time difference of code flight ETD times to be matched somebody with somebody and current time is equal to default first time length；
When the time difference being equal to first time length, judge whether code flight to be matched somebody with somebody has obtained clearance license；
When clearance license is obtained with code flight, SSR codes are distributed for code flight to be matched somebody with somebody.
Further, SSR codes are distributed for code flight to be matched somebody with somebody, specifically includes, judge whether the SSR being not yet allocated
Code, and when there is not yet allocated SSR codes, directly SSR codes are distributed for code flight to be matched somebody with somebody.
Further, SSR codes are distributed for code flight to be matched somebody with somebody, specifically further includes, judge whether what is be not yet allocated
SSR codes, and there is no during not yet allocated SSR codes, traversal has each been allocated the flight that taken off of SSR codes,
And give the SSR codes duplicate allocation of the qualified flight that taken off to code flight to be matched somebody with somebody.
Further, traversal has each been allocated the flights that taken off of SSR codes, and by the qualified flight that taken off
SSR codes duplicate allocation to code flight to be matched somebody with somebody, specifically include,
Judge taken off flight actual time of departure and current time time difference be more than default second time span；
When the time difference being more than the second time span, whether the SSR codes of flight of judging to have taken off are duplicatedly distributed；
When the SSR codes for the flight that taken off are not duplicatedly distributed, the SSR codes duplicate allocation for the flight that taken off is treated
With code flight.
Further, specifically further include, judge taken off flight the affiliated information area of destination airport whether with code match somebody with somebody boat
Class it is different, and the affiliated information area of destination airport for the flight that taken off with when with code flight it is different when, just allow to have risen
The SSR codes duplicate allocation of flight class gives code flight to be matched somebody with somebody.
Further, specifically further include, judge taken off flight go out interface point grouping whether with code flight to be matched somebody with somebody
It is different, and the flight that taken off go out interface point grouping with when with code flight it is different when, just allow the flight that taken off
SSR codes duplicate allocation gives code flight to be matched somebody with somebody.
Further, the border of an air-traffic control zone and another air-traffic control zone can be divided into multiple points
Group, each grouping include one or more way points.
On the other hand, the present invention also provides a kind of system of secondary radar answering machine code duplicate allocation, including,
Time difference judging unit, it is pre- whether the time difference for judging code flight ETD times to be matched somebody with somebody and current time is equal to
If first time length；
Clearance License Authentication unit, for when the time difference being equal to first time length, whether to judge code flight to be matched somebody with somebody
Obtain license of letting pass；
Code assignment unit, for when clearance license is obtained with code flight, SSR codes to be distributed for code flight to be matched somebody with somebody.
Further, code assignment unit is specifically used for, and judges whether the SSR codes being not yet allocated, and is depositing
In not yet allocated SSR codes, directly SSR codes are distributed for code flight to be matched somebody with somebody.
Further, code assignment unit is specifically additionally operable to, and judges whether the SSR codes being not yet allocated, and
There is no during not yet allocated SSR codes, traversal has each been allocated the flight that taken off of SSR codes, and will be eligible
The flight that taken off SSR codes duplicate allocation give code flight to be matched somebody with somebody.
The method and system of secondary radar answering machine code duplicate allocation provided by the invention, when with code flight ETD
Between before first time length (for example, T minutes before code flight ETD times to be matched somebody with somebody), the clearance system received according to ATC system
The code flight clearance information to be matched somebody with somebody of system, checks whether code flight to be matched somebody with somebody has obtained the clearance license of control department, in definite control
Department has been granted after letting pass with code flight, and ATC system just distributes SSR codes for code flight to be matched somebody with somebody automatically, and according to flight
The inspections conditions such as interface point grouping that go out that the affiliated information area of destination airport, flight fly away from this regulatory area are avoided as identical flight side
To flight distribution repeat SSR codes.So, it can be achieved that efficiently using for SSR code resources, greatly reduces " sky accounts for " SSR
Code phenomenon.
That is, the method and system of secondary radar answering machine code duplicate allocation provided by the invention, can make ATC systems
System can be in the case where code flight amount to be matched somebody with somebody of leaving the port be big, and more scientific, reasonably automatic is that code flight the to be matched somebody with somebody distribution left the port is secondary
Radar responder code improves the degree of safety of entire control work.
Description of the drawings
Fig. 1 is the flow chart of the method for secondary radar answering machine code duplicate allocation provided in an embodiment of the present invention；
Fig. 2 is another flow chart of the method for secondary radar answering machine code duplicate allocation provided in an embodiment of the present invention；
Fig. 3 is the block diagram of the system of secondary radar answering machine code duplicate allocation provided in an embodiment of the present invention.
Specific embodiment
It is further illustrated the present invention below by specific embodiment, it should be understood, however, that, these embodiments are only
It is used for specifically describing in more detail, and is not to be construed as limiting the present invention in any form.
Embodiment one
With reference to Fig. 1, the method for secondary radar answering machine code duplicate allocation provided in this embodiment, including,
Step S1, judges whether the time difference of code flight ETD times to be matched somebody with somebody and current time is equal to default first time
Length；
Step S2 when the time difference being equal to first time length, judges whether code flight to be matched somebody with somebody has obtained clearance license；
When clearance license is obtained with code flight, SSR codes are distributed for code flight to be matched somebody with somebody by step S3.
The method of secondary radar answering machine code duplicate allocation provided in an embodiment of the present invention, when with code flight ETD
Between before first time length (for example, T minutes before code flight ETD times to be matched somebody with somebody), the clearance system received according to ATC system
The code flight clearance information to be matched somebody with somebody of system, checks whether code flight to be matched somebody with somebody has obtained the clearance license of control department, in definite control
Department has been granted after letting pass with code flight, and ATC system just distributes SSR codes for code flight to be matched somebody with somebody automatically.So, it can be achieved that
Efficiently using for SSR code resources greatly reduces " sky accounts for " SSR code phenomenons.
That is, the method for secondary radar answering machine code duplicate allocation provided in this embodiment, can enable ATC system
In the case where code flight amount to be matched somebody with somebody of leaving the port is big, more scientific, reasonably automatic is that the code flight to be matched somebody with somebody to leave the port distributes secondary radar
Answering machine code improves the degree of safety of entire control work.
Preferably, SSR codes are distributed for code flight to be matched somebody with somebody, specifically includes, judge whether the SSR generations being not yet allocated
Code, and when there is not yet allocated SSR codes, directly SSR codes are distributed for code flight to be matched somebody with somebody.
It is further preferred that distributing SSR codes for code flight to be matched somebody with somebody, specifically further include, judge whether not yet to be divided
SSR codes matched somebody with somebody, and there is no during not yet allocated SSR codes, what traversal had each been allocated SSR codes has played flight
Class, and give the SSR codes duplicate allocation of the qualified flight that taken off to code flight to be matched somebody with somebody.
Preferably, first time length is T, and the second time span is DT, and the value of T is generally 20 to 60 minutes, and DT
Value be generally 20 minutes.It should be noted that the present embodiment is not especially limited the specific value of T and DT, can combine
Actual needs is selected.
In the present embodiment, the SSR codes duplicate allocation of the qualified flight that taken off will be allocated SSR codes
Code flight to be matched somebody with somebody.And the specific method of salary distribution is to judge the taken off actual time of departure of flight and the time of current time
Difference is more than default second time span；When the time difference being more than the second time span, the SSR codes of flight of judging to have taken off are
It is no to be duplicatedly distributed；When the SSR codes for the flight that taken off are not duplicatedly distributed, the SSR codes for the flight that taken off are repeated to divide
Dispensing code flight to be matched somebody with somebody.
In the present embodiment, the second time span is the interval time of duplicate allocation SSR codes, and usually, during the interval
Between be arranged to 20 minutes or more, the unsafe conditions of same control sector are appeared in the flight for reducing identical SSR codes
The probability of generation.It should be noted that in the present embodiment, regulatory area is made of multiple control sectors, regulatory area spatial domain scope compared with
Greatly, control sector spatial domain scope is smaller.Furthermore, it is necessary to illustrate, two airplanes are had in the same sector of regulatory area
Using the situation of identical SSR codes, to the identification of two flights occurs for the ATC system for being easy to cause this regulatory area chaotic (SSR generations
Code is the key factor of ATC system identification flight), serious influence is caused on the control work of this regulatory area.
It is further preferred that further include, the affiliated information area of destination airport of the flight that judges to have taken off whether with code match somebody with somebody boat
Class it is different, and the affiliated information area of destination airport for the flight that taken off with when with code flight it is different when, by the flight that taken off
SSR codes duplicate allocation give code flight to be matched somebody with somebody.
In the present embodiment, to the flight that taken off the departure time interval and SSR codes to the flight that taken off weight
After situations such as subdivision is matched somebody with somebody is judged, continue analyze again the code flight to be matched somebody with somebody that takes off the affiliated information area of destination airport whether with
The affiliated information area of destination airport of code flight to be matched somebody with somebody to be allocated is consistent, if unanimously, not by the SSR code weights of the flight that taken off
Subdivision dispensing code flight to be matched somebody with somebody to be allocated, conversely, can then implement to distribute.
It should be noted that the consistent flight in the affiliated information area of two destination airports is allocated identical SSR codes, easily
Cause the two flights that the identification of the two flights occurs in the ATC system of the subsequent control unit in-flight to be passed through mixed
Disorderly.
Furthermore, it is necessary to explanation, flight information region (Flight Information Region, FIR), is by the world
Civil aviation organization delimited, and for the space for providing flight information service and alerting service draws the line, each information area is by multiple
Adjacent control zone composition.By taking China as an example, Chinese civil aviaton spatial domain is divided altogether for 11 flight information regions.
It is further preferred that as illustrated in fig. 2, specifically further include, the grouping for going out interface point for the flight that judges to have taken off is
It is no different with code flight to be matched somebody with somebody, and the flight that taken off go out interface point grouping with when with code flight it is different when, will
Take off flight SSR codes duplicate allocation give code flight to be matched somebody with somebody.
Specifically, the border of an air-traffic control zone and another air-traffic control zone can be divided into multiple points
Group, each grouping include one or more way points.
It should be noted that the present embodiment is grouped the boundary point of this regulatory area and other regulatory areas, each group can
Comprising one or more way points, to go out interface point and fly away from the way point that this regulatory area uses for flight.In addition, the present embodiment
In, the interface point (or way point) for being subordinated to same group is flown away from the flight of this regulatory area by ATC system, is considered as heading phase
Same flight.
In the present embodiment, the takeoff separation time of identical SSR codes flight was both controlled, further through the purpose machine to flight
Place belongs to the inspection in information area and flight flies away from the inspection of grouping belonging to the boundary point of this regulatory area, it is ensured that identical SSR generations
The heading of code flight is different, causes safety hidden so as to avoid the control work of the control unit subsequently to be passed through to flight
Suffer from.
Embodiment two
With reference to Fig. 3, the system of secondary radar answering machine code duplicate allocation provided in this embodiment, including,
Time difference judging unit 1, it is pre- whether the time difference for judging code flight ETD times to be matched somebody with somebody and current time is equal to
If first time length；
Clearance License Authentication unit 2, for when the time difference being equal to first time length, whether to judge code flight to be matched somebody with somebody
Obtain license of letting pass；
Code assignment unit 3, for when clearance license is obtained with code flight, SSR codes to be distributed for code flight to be matched somebody with somebody.
The system of secondary radar answering machine code duplicate allocation provided in an embodiment of the present invention, when with code flight ETD
Between before first time length (for example, T minutes before code flight ETD times to be matched somebody with somebody), the clearance system received according to ATC system
The code flight clearance information to be matched somebody with somebody of system, checks whether code flight to be matched somebody with somebody has obtained the clearance license of control department, in definite control
Department has been granted after letting pass with code flight, and ATC system just distributes SSR codes for code flight to be matched somebody with somebody automatically.So, it can be achieved that
Efficiently using for SSR code resources greatly reduces " sky accounts for " SSR code phenomenons.
That is, the system of secondary radar answering machine code duplicate allocation provided in this embodiment, can enable ATC system
In the case where code flight amount to be matched somebody with somebody of leaving the port is big, more scientific, reasonably automatic is that the code flight to be matched somebody with somebody to leave the port distributes secondary radar
Answering machine code improves the degree of safety of entire control work.
Preferably, code assignment unit 3 are specifically used for, and judge whether the SSR codes being not yet allocated, and are depositing
In not yet allocated SSR codes, directly SSR codes are distributed for code flight to be matched somebody with somebody.
It is further preferred that code assignment unit 3, is specifically additionally operable to, the SSR generations being not yet allocated are judged whether
Code, and there is no during not yet allocated SSR codes, traversal has each been allocated the flight that taken off of SSR codes, and will symbol
The SSR codes duplicate allocation of the flight that taken off of conjunction condition gives code flight to be matched somebody with somebody.
In the present embodiment, the SSR codes duplicate allocation of the qualified flight that taken off will be allocated SSR codes
Code flight to be matched somebody with somebody.And the specific method of salary distribution is to judge the taken off actual time of departure of flight and the time of current time
Difference is more than default second time span；When the time difference being more than the second time span, the SSR codes of flight of judging to have taken off are
It is no to be duplicatedly distributed；When the SSR codes for the flight that taken off are not duplicatedly distributed, the SSR codes for the flight that taken off are repeated to divide
Dispensing code flight to be matched somebody with somebody.
In the present embodiment, the second time span is the interval time of duplicate allocation SSR codes, and usually, during the interval
Between be arranged to 20 minutes or more, the unsafe conditions of same control sector are appeared in the flight for reducing identical SSR codes
The probability of generation.It should be noted that in the present embodiment, regulatory area is made of multiple control sectors, regulatory area spatial domain scope compared with
Greatly, control sector spatial domain scope is smaller.Furthermore, it is necessary to illustrate, two airplanes are had in the same sector of regulatory area
Using the situation of identical SSR codes, to the identification of two flights occurs for the ATC system for being easy to cause this regulatory area chaotic (SSR generations
Code is the key factor of ATC system identification flight), serious influence is caused on the control work of this regulatory area.
It is further preferred that be additionally operable to, the affiliated information area of destination airport of the flight that judges to have taken off whether with code match somebody with somebody boat
Class it is different, and the affiliated information area of destination airport for the flight that taken off with when with code flight it is different when, by the flight that taken off
SSR codes duplicate allocation give code flight to be matched somebody with somebody.
In the present embodiment, to the flight that taken off the departure time interval and SSR codes to the flight that taken off weight
After situations such as subdivision is matched somebody with somebody is judged, continue analyze again the code flight to be matched somebody with somebody that takes off the affiliated information area of destination airport whether with
The affiliated information area of destination airport of code flight to be matched somebody with somebody to be allocated is consistent, if unanimously, not by the SSR code weights of the flight that taken off
Subdivision dispensing code flight to be matched somebody with somebody to be allocated, conversely, can then implement to distribute.
It should be noted that the consistent flight in the affiliated information area of two destination airports is allocated identical SSR codes, easily
Cause the two flights that the identification of the two flights occurs in the ATC system of the subsequent control unit in-flight to be passed through mixed
Disorderly.
Furthermore, it is necessary to explanation, flight information region (Flight Information Region, FIR), is by the world
Civil aviation organization delimited, and for the space for providing flight information service and alerting service draws the line, each information area is by multiple
Adjacent control zone composition.By taking China as an example, Chinese civil aviaton spatial domain is divided altogether for 11 flight information regions.
It is further preferred that be specifically additionally operable to, the grouping for going out interface point of the flight that judges to have taken off whether with code match somebody with somebody boat
Class it is different, and the flight that taken off go out interface point grouping with when with code flight it is different when, by the SSR for the flight that taken off
Code duplicate allocation gives code flight to be matched somebody with somebody.
Specifically, the border of an air-traffic control zone and another air-traffic control zone can be divided into multiple points
Group, each grouping include one or more way points.
It should be noted that the present embodiment is grouped the boundary point of this regulatory area and other regulatory areas, each group can
Comprising one or more way points, to go out interface point and fly away from the way point that this regulatory area uses for flight.In addition, the present embodiment
In, the interface point (or way point) for being subordinated to same group is flown away from the flight of this regulatory area by ATC system, is considered as heading phase
Same flight.
In the present embodiment, the takeoff separation time of identical SSR codes flight was both controlled, further through the purpose machine to flight
Place belongs to the inspection in information area and flight flies away from the inspection of grouping belonging to the boundary point of this regulatory area, it is ensured that identical SSR generations
The heading of code flight is different, causes safety hidden so as to avoid the control work of the control unit subsequently to be passed through to flight
Suffer from.
Although present invention has been a degree of descriptions, it will be apparent that, do not departing from the spirit and scope of the present invention
Under the conditions of, the appropriate variation of each condition can be carried out.It is appreciated that the invention is not restricted to the embodiment, and it is attributed to right
It is required that scope, include the equivalent substitution of each factor.
Claims (10)
- A kind of 1. method of secondary radar answering machine code duplicate allocation, which is characterized in that including,Judge whether the time difference of code flight ETD times to be matched somebody with somebody and current time is equal to default first time length；When the time difference being equal to the first time length, whether code flight to be matched somebody with somebody described in judgement has obtained clearance license；Described when clearance license is obtained with code flight, SSR codes are distributed for the code flight to be matched somebody with somebody.
- 2. the method for secondary radar answering machine code duplicate allocation according to claim 1, which is characterized in that described for institute Code flight distribution SSR codes to be matched somebody with somebody are stated, are specifically included, the SSR codes being not yet allocated is judged whether, and exists not yet It is directly the code flight distribution SSR codes match somebody with somebody during allocated SSR codes.
- 3. the method for secondary radar answering machine code duplicate allocation according to claim 1, which is characterized in that described for institute State code flight to be matched somebody with somebody distribution SSR codes, specifically further include, judge whether the SSR codes being not yet allocated, and there is no During the SSR codes being not yet allocated, traversal has each been allocated the flight that taken off of SSR codes, and has been risen qualified The SSR codes duplicate allocation of flight class gives the code flight to be matched somebody with somebody.
- 4. the method for secondary radar answering machine code duplicate allocation according to claim 3, which is characterized in that the traversal Each flight that taken off for being allocated SSR codes, and by the SSR codes duplicate allocation of the qualified flight that taken off to institute Code flight to be matched somebody with somebody is stated, is specifically included,Judge taken off flight actual time of departure and current time time difference be more than default second time span；When the time difference being more than second time span, whether the SSR codes of flight of judging to have taken off are duplicatedly distributed；When the SSR codes for the flight that taken off are not duplicatedly distributed, the SSR codes duplicate allocation for the flight that taken off is treated to described With code flight.
- 5. the method for secondary radar answering machine code duplicate allocation according to claim 4, which is characterized in that specifically also wrap It includes, whether the affiliated information area of destination airport for the flight that judges to have taken off is different with the code flight to be matched somebody with somebody, and is playing flight Class the affiliated information area of destination airport with it is described when with code flight it is different when, by the SSR code duplicate allocations for the flight that taken off To the code flight to be matched somebody with somebody.
- 6. the method for secondary radar answering machine code duplicate allocation according to claim 4 or 5, which is characterized in that specific It further includes, whether the grouping for going out interface point for the flight that judges to have taken off is different with the code flight to be matched somebody with somebody, and is playing flight Class go out interface point grouping with it is described when with code flight it is different when, by the SSR codes duplicate allocation for the flight that taken off to institute State code flight to be matched somebody with somebody.
- 7. the method for secondary radar answering machine code duplicate allocation according to claim 6, which is characterized in that one aerial The border of traffic control area and another air-traffic control zone can be divided into multiple groupings, each grouping include one or Multiple way points.
- 8. a kind of system of secondary radar answering machine code duplicate allocation, which is characterized in that including,Time difference judging unit, it is default whether the time difference for judging code flight ETD times to be matched somebody with somebody and current time is equal to First time length；Clearance License Authentication unit, for when the time difference being equal to the first time length, code flight to be matched somebody with somebody described in judgement to be It is no to have obtained clearance license；Code assignment unit, for when clearance license is obtained with code flight, SSR generations to be distributed for the code flight to be matched somebody with somebody described Code.
- 9. the system of secondary radar answering machine code duplicate allocation according to claim 8, which is characterized in that the code Allocation unit is specifically used for, and judges whether the SSR codes being not yet allocated, and there is not yet allocated SSR codes When, directly SSR codes are distributed for the code flight to be matched somebody with somebody.
- 10. the system of secondary radar answering machine code duplicate allocation according to claim 8, which is characterized in that the generation Code allocation unit, is specifically additionally operable to, judges whether the SSR codes being not yet allocated, and there is no not yet allocated During SSR codes, traversal has each been allocated the flights that taken off of SSR codes, and by the SSR generations of the qualified flight that taken off Code duplicate allocation gives the code flight to be matched somebody with somebody.
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