CN111210670B - Method and system for centralized distribution of secondary radar responder codes - Google Patents
Method and system for centralized distribution of secondary radar responder codes Download PDFInfo
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- CN111210670B CN111210670B CN202010070698.XA CN202010070698A CN111210670B CN 111210670 B CN111210670 B CN 111210670B CN 202010070698 A CN202010070698 A CN 202010070698A CN 111210670 B CN111210670 B CN 111210670B
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
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- G01S13/91—Radar or analogous systems specially adapted for specific applications for traffic control
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Abstract
The invention discloses a method for centralized distribution of secondary radar responder codes, which comprises the following steps: building a distribution system in an SSR code set; establishing a flight 4D flight path model in a distribution system in an SSR code set; the distribution system in the SSR code set calculates and avoids SSR code conflicts by utilizing a 4D flight path model of flights in a service airspace range, and calculates that the same SSR code can be distributed to a plurality of flights to be distributed for use; and the distribution system in the SSR code set performs information interaction with the ATC system in a set data message mode, and sends a distribution result to the corresponding ATC system. The method realizes unified management and centralized distribution of SSR code resources of all control units in a large-scale airspace, can simultaneously distribute the same SSR code to a plurality of flights to be matched for use, and improves the overall use efficiency of the SSR code resources.
Description
Technical Field
The invention relates to the technical field of air traffic control, in particular to a method and a system for centralized distribution of secondary radar responder codes.
Background
An Air Traffic Control automation System (ATC System) is the most important technical tool for an Air Traffic controller to grasp the Air flight situation in real time and implement Air Traffic Control.
The airborne Secondary Radar responder (SSR) is a device for automatically responding to ground Secondary Radar interrogation signals, and is an important basis for identifying aircrafts in Radar control. Before the flight takes off, the ATC system automatically allocates the SSR codes to the flight to be used in the flight.
Flight Information regions (FIR for short) are defined by the International civil aviation organization, and define the space of the range for providing Flight Information service and alarm service, and each Information Region is composed of a plurality of adjacent controlled airspaces. Taking China as an example, the civil aviation airspace of China is divided into 11 flight information areas.
Currently, the number of globally available SSRs is only 4096, and these SSR resources are distributed by the international civil aviation organization by dividing them into two code segments, namely, inside an information area and outside the information area (cross-information area, which is hereinafter referred to as cross-area). Wherein, only 927 cross-region codes are allocated to China civil aviation.
At present, China civil aviation statically allocates airborne secondary radar responder code (SSR code) resources to each control area for use, the number of SSR codes which can be used in each control area is fixed and limited, and when a flight in the control area takes off and goes to a destination airport in other information areas, an air traffic control automation system (ATC system) in the control area can only select one airborne secondary radar responder (SSR) from the available SSR codes to allocate to the flight for use. The traditional SSR allocation technical scheme is as follows:
the ATC system checks whether the flight has been granted permission by the control department T minutes (parameter, usually between 10-60 minutes) before the predicted Departure Time of the flight (ETD), and automatically allocates SSR to the flight after determining that the control department has granted the flight to be granted permission.
2. And if the number of flights currently leaving the port is large and the available SSR resources are completely allocated, the ATC system starts to repeatedly allocate SSRs. The mechanism for the ATC system to repeatedly assign SSR codes is generally as follows:
a) a time parameter of 'repeatedly allocating SSR flight interval time DT minutes' (more than 20 minutes is recommended) is set in the ATC system, so that the ATC system can control the takeoff time interval of repeatedly allocating the same SSR in real time.
b) The boundary points of the local regulated area and other regulated areas are grouped in the ATC system, and each group can contain one or more waypoints. Flights departing from the local geofence from the same group's junction are considered by the ATC system to be flights in the same flight direction.
c) Traversing and inquiring all flights which have actually taken off for more than DT minutes and are allocated with SSRs, if the destination airport of the flight which is allocated with SSRs does not belong to the same flight information area as the destination airport of the flight which needs to be allocated with SSRs, and the point of departure of the flight which is allocated with SSRs from the intersection point of the control area is not the same point or the point of departure of the new flight which needs to be allocated with SSRs from the intersection point of the control area, the SSRs of the flight which is allocated with SSRs are allowed to be allocated to the new flight to be allocated with SSRs for use.
In order to avoid as much as possible the occurrence of flights using the same SSR occurring simultaneously in the airspace of the present regulatory region, the same SSR, at most, is allowed to be allocated to only two flights simultaneously, one of which must be an already-departing flight and the other must be an unreported flight. The disadvantages of the conventional technique are as follows:
1) the traditional SSR distribution technical mechanism can only serve the control units with smaller airspace range, and is not suitable for the control units with larger airspace range, such as information areas and national airspaces.
2) When the number of overstocked departure flights in the control area is large, the situations that the SSR is insufficient and the departure flights in the control area have no SSR available for distribution still occur.
Disclosure of Invention
Aiming at the defects in the prior art, the method and the system for centralized allocation of the secondary radar responder codes provided by the embodiment of the invention realize unified management and centralized allocation of the SSR code resources of each control unit in a large-scale airspace, can simultaneously allocate the same SSR code to a plurality of flights to be allocated for use, and improve the overall use efficiency of the SSR code resources.
In a first aspect, the present embodiment provides a method for centralized allocation of secondary radar responder codes, where the method includes:
building a distribution system in an SSR code set, wherein the distribution system in the SSR code set is used for carrying out centralized management and centralized distribution on available SSR code resources in a large airspace;
establishing a flight 4D flight path model in a distribution system in an SSR code set;
the distribution system in the SSR code set calculates and avoids SSR code conflicts by utilizing a 4D flight path model of flights in a service airspace range, and calculates that the same SSR code can be distributed to a plurality of flights to be distributed for use;
and the distribution system in the SSR code set performs information interaction with the ATC system in a set data message mode, and sends a distribution result to the corresponding ATC system.
In a second aspect, the system for centralized distribution of secondary radar responder codes provided by this embodiment includes a distribution system construction unit, a flight 4D flight trajectory model establishment unit, an SSR code collision avoidance unit, and an information interaction unit in an SSR code set,
the SSR code set distribution system construction unit is used for constructing an SSR code set distribution system, and the SSR code set distribution system is used for performing centralized management and centralized distribution on available SSR code resources in a large airspace;
the flight 4D flight path model establishing unit is used for establishing a flight 4D flight path model;
the SSR code collision avoidance unit is used for calculating SSR code collision avoidance by using a 4D flight track model of flights in a service airspace range, and calculating the same SSR code which can be distributed to a plurality of flights to be coded for use;
the information interaction unit is used for performing information interaction with the ATC system in a set data message form.
The invention has the beneficial effects that:
the method and the system for centralized allocation of secondary radar responder codes provided by the embodiment realize unified management and centralized allocation of SSR code resources of each control unit in a large airspace, adopt a flight 4D flight trajectory model to calculate whether flights using the same SSR codes can cause SSR code conflict warning in flight, and break through the technical limit of the upper limit of the SSR code reuse rate in the traditional SSR code allocation technology. Therefore, secondary codes are more scientifically and efficiently distributed to the departure flights in the large-range airspace, the utilization rate of the existing SSR code resources is further improved, and the flight operation with more number is supported under the condition that the number of the existing SSR code resources is not changed.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a flow chart of a method for centralized secondary radar responder code allocation according to a first embodiment of the present invention;
FIG. 2 is a flow chart of a specific method for establishing a flight 4D flight path model in FIG. 1;
FIG. 3 is a flowchart illustrating a specific method for avoiding SSR code conflicts by using a 4D flight trajectory model calculation of the flight in FIG. 1;
fig. 4 shows a system block diagram of secondary radar responder code centralized allocation provided by a second embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to a determination" or "in response to a detection". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
Fig. 1 is a flowchart illustrating a method for centralized allocation of secondary radar responder codes according to a first embodiment of the present invention, where the method includes:
s1, constructing an SSR code set distribution system, wherein the SSR concentrated distribution system is used for carrying out centralized management and centralized distribution on available SSR code resources in a large airspace;
s2, establishing a flight 4D flight path model in a distribution system in the SSR code set;
s3, calculating and avoiding SSR code conflicts by a distribution system in an SSR code set through a 4D flight path model of all flights in a service airspace range, and calculating that the same SSR code can be distributed to a plurality of flights to be distributed for use;
and S4, the distribution system in the SSR code set performs information interaction with the ATC system in a set data message mode, and sends a distribution result to the corresponding ATC system.
In this embodiment, a distribution system in an SSR code set is constructed, and the distribution system in the SSR code set implements an output flight plan and a comprehensive trajectory by introducing an ATC system of each important control unit in a large-scale control airspace (a large airspace for short, such as an information area, a national airspace, and the like), so as to grasp an on-day dynamic flight plan and an actual flight situation in the large airspace. And the distribution system in the SSR code set simultaneously integrates the available SSR code resources in the large airspace and performs centralized management and centralized distribution on the available SSR code resources in the large airspace. After the distribution system in the SSR code set is built, the works of SSR code distribution, release and the like of flights taking off from all airports in a service airspace of the distribution system in the SSR code set are completed by the distribution system in the SSR code set, and the distribution system in the SSR code set sends a distribution result to the ATC system.
The method for centralized allocation of secondary radar responder codes provided by the embodiment realizes unified management and centralized allocation of SSR code resources of each control unit in a large airspace, adopts a flight 4D flight path model to calculate whether flights using the same SSR codes possibly cause SSR code collision warning in flight, and breaks through the technical limit of the upper limit of the SSR code reuse rate in the traditional SSR code allocation technology. Therefore, secondary codes are more scientifically and efficiently distributed to the departure flights in the large-range airspace, the utilization rate of the existing SSR code resources is further improved, and the flight operation with more number is supported under the condition that the number of the existing SSR code resources is not changed.
As shown in fig. 2, a flow chart for establishing a flight 4D flight trajectory model is shown. In this embodiment, a specific method for establishing a flight 4D flight trajectory model in a distribution system in an SSR code set includes:
s21, acquiring FPL message information;
s22, analyzing the airway according to the FPL message information, analyzing the airway string into airway points, and obtaining a complete airway point string of the flight along the flight path;
s23, analyzing the terminal area in the service airspace range to obtain a complete flight track point sequence containing departure procedure points/arrival procedure points;
and S24, calculating flight profiles by combining the empirical data, the flight performance data of the airplane and the high-altitude wind data, and calculating the time, the height and the speed of the flight reaching each waypoint to obtain a 4D track model of the flight.
The distribution system in the SSR code set calculates the 4D track of all flights in the service airspace range: according to the flight route of the flight, the time and the height of the flight reaching each waypoint after the flight takes off are calculated, so that a 4D track model with continuity of height and time is formed, and SID/STAR used by the flight is included. The system profile height starts from the height of a take-off airport, the performance of the aircraft and the allowable flight height data are referred by using the flight performance database, the passing time and the flight height of the flight reaching each waypoint are calculated by combining empirical data, and finally, the height of the flight reaching a destination airport and the time predicted to reach the destination airport are calculated.
As shown in fig. 3, a specific flow chart of the method for avoiding SSR code conflicts is shown for a distribution system in SRR code set by computing a 4D flight trajectory model for all flights in the service airspace range. In this embodiment, a specific method for a distribution system in an SSR code set to avoid an SSR code conflict by calculating a 4D flight trajectory model of all flights in a service airspace range includes:
s31, calculating the minimum distance of the target to-be-matched flight using the same SSR code at the current moment and the future moment according to the time, the height and the speed of the flight reaching each waypoint;
s32, comparing the calculated minimum distance with a set distance threshold value;
and S33, if the minimum distance is larger than the set distance threshold, judging that the two flights to be matched can be allocated to use the same SSR codes.
The allocation system in the SSR code set in this embodiment calculates the minimum distance between the target flights to be allocated with the same SSR code at a current time and a future time (for example, after 30 minutes) based on the accurate 4D trajectory of the flight calculated in the foregoing, and if the minimum distance is greater than a set distance threshold (for example, 300 km), it is considered that the two flights to be allocated with the same SSR code can be allocated to use the same SSR code, and it is considered that no SSR code collision occurs between the two flights. Under the precondition of ensuring that flights do not conflict directly with each other, the same SSR code is allowed to be allocated to a plurality of flights to be used simultaneously, so that the overall use efficiency of SSR code resources is improved to the maximum extent.
In order to realize the interactive operation of SSR code information between the distribution system in the SSR code set and each ATC system, the data message form of the distribution system and the ATC system in the SSR code set is specially set. The data message form comprises the following 5 types: the method comprises the steps of requesting to distribute an SSR Code report (Code Request MSG, CRQ report for short), requesting to Release an SSR Code report (Code Release MSG, CRE report for short), distributing an SSR Code report (Code Assignment MSG, CAM report for short), recovering an SSR Code report (Code Cancellation MSG, CCM report for short) and replacing the SSR Code report (Code Replace MSG, CPM report for short).
The message data requesting to distribute the SSR code report comprises: message type, flight execution date, estimated departure time, flight number, landing airport, flight route, SSR code to be assigned (if the user system needs to specify that a SSR is assigned, there is this data), etc. The sending time is as follows: when the ATC system needs to distribute the SSR codes to a certain flight, the ATC system sends the message to a distribution system in the SSR code set. The method for processing the request of the distribution system in the SSR code set to distribute the SSR code report comprises the following steps: and the distribution system in the SSR code set receives the CRQ message, extracts the specific information of the flight from the message and finds the corresponding flight according to the specific information. If the message information carries the SSR code, the SSR centralized distribution system checks whether the SSR code can be distributed to the flight for use, if the SSR code can be distributed to the flight, the designated SSR code is automatically distributed to the flight, and a CAM report is sent to the ATC system to inform the ATC system of the distribution result of the SSR code. If the message information carries the SSR code or the SSR code carried by the message information is unavailable, the distribution system in the SSR code set automatically distributes an SSR code for the flight, and sends a CAM report to the ATC system to inform the ATC system of a new SSR code distribution result.
The message data requesting to release the SSR code report comprises: message type, flight execution date, predicted takeoff time, flight number, landing airport, flight route and SSR code to be released. The sending time is as follows: when the user system needs to release the SSR currently used by the user system for a certain flight, the user system sends the message to the centralized distribution system. The method for processing the request of the distribution system in the SSR code set to release the SSR code report comprises the following steps: and the distribution system in the SSR code set receives the CRE message, extracts the specific information of the flight from the message, finds the corresponding flight according to the information and automatically releases the SSR code distributed to the flight.
The message data for distributing the SSR code report comprises the following steps: the type of the message, the execution date of the flight, the estimated takeoff time, the flight number, the landing airport, the SSR codes distributed to the flight by the distribution system in the SSR code set, and the like. The sending time is as follows: when the distribution system in the SSR code set distributes an SSR code to the flight, the distribution system in the SSR code set sends the message to the ATC system. The method for processing and distributing SSR code reports by the ATC system comprises the following steps: the ATC system receives the distributed SSR code report, extracts the specific information of the flight from the message information, finds the corresponding flight according to the information, and modifies the SSR code of the flight into the SSR code in the CAM report.
Recovering message data of the SSR code report: message type, flight execution date, estimated takeoff time, flight number, airport of taking off and landing, SSR code currently used by flight, and the like. The sending time is as follows: when the distribution system in the SSR code set releases one SSR code for the flight, the distribution system in the SSR code set sends the message to the ATC system. The ATC system receives the recovered SSR code message, extracts the specific information of the flight from the information in the message, finds the corresponding flight according to the information and releases the SSR code of the flight.
Replacing the message data of the SSR code report: message type, flight execution date, estimated takeoff time, flight number, landing airport, new SSR codes which should be replaced and used by flights and the like. The sending time is as follows: when the distribution system in the SSR code set monitors that SSR code conflicts occur between flights or predicts that the SSR code conflicts occur between the flights in a future period of time, the distribution system in the SSR code set automatically calculates an SSR code which can be used for removing the SSR code conflicts for the flights and sends the message to the ATC system.
According to the method for centralized distribution of codes of secondary radar responder, the data interaction format between the distribution system and each ATC system in the SSR code set is set, so that mutual cooperation between information interaction and SSR code distribution between the distribution system and each ATC system in the SSR code set is realized, the same SSR code can be distributed to multiple flights, SSR code conflict does not occur, and the total use efficiency of SSR code resources is improved.
In the first embodiment, a method for centralized distribution of secondary radar responder codes is provided, and correspondingly, a system for centralized distribution of secondary radar responder codes is also provided in the second embodiment of the present invention. Please refer to fig. 4, which is a diagram illustrating a system for centralized code allocation of secondary radar transponders according to a second embodiment of the present invention. Since the apparatus embodiments are substantially similar to the method embodiments, they are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for relevant points. The device embodiments described below are merely illustrative.
As shown in fig. 4, there is a block diagram illustrating a system for centralized distribution of secondary radar responder codes, which includes: the method comprises a distribution system construction unit 1, a flight 4D flight trajectory model construction unit 2, an SSR code collision avoidance unit 3 and an information interaction unit 4 in an SSR code set, wherein the distribution system construction unit 1 in the SSR code set is used for constructing a distribution system in the SSR code set, and the distribution system in the SSR code set is used for carrying out centralized management and centralized distribution on available SSR code resources in a large airspace; the flight 4D flight path model establishing unit 2 is used for establishing a flight 4D flight path model; the avoidance SSR code conflict unit 3 is used for calculating avoidance SSR code conflicts by using a 4D flight track model of flights in a service airspace range, and calculating the same SSR code which can be distributed to a plurality of flights to be coded for use; the information interaction unit 4 is used for performing information interaction with the ATC system in a set data message form.
The system for centralized distribution of secondary radar responder codes provided by the embodiment realizes unified management and centralized distribution of SSR code resources of each control unit in a large airspace, adopts a flight 4D flight path model to calculate whether flights using the same SSR codes possibly cause SSR code collision warning in flight, and breaks through the technical limit of the upper limit of the SSR code reuse rate in the traditional SSR code distribution technology. Therefore, secondary codes are more scientifically and efficiently distributed to the departure flights in the large-range airspace, the utilization rate of the existing SSR code resources is further improved, and the flight operation with more number is supported under the condition that the number of the existing SSR code resources is not changed.
In this embodiment, the flight 4D flight trajectory model establishing unit is specifically configured to:
acquiring FPL message information;
analyzing the airway according to the FPL message information, and analyzing the airway string into airway points to obtain a complete airway point string of the flight along the flight route;
analyzing the terminal area in the service airspace range to obtain a complete flight track point sequence containing departure procedure points/arrival procedure points;
and calculating a flight profile by combining the empirical data, the flight performance data of the airplane and the high-altitude wind data, and calculating the time, the height and the speed of the flight reaching each waypoint to obtain a 4D track model of the flight.
The flight 4D flight path model building unit calculates the 4D paths of all flights in the service airspace range: according to the flight route of the flight, the time and the height of the flight reaching each waypoint after the flight takes off are calculated, so that a 4D track model with continuity of height and time is formed, and SID/STAR used by the flight is included. The system profile height starts from the height of a take-off airport, the performance of the aircraft and the allowable flight height data are referred by using the flight performance database, the passing time and the flight height of the flight reaching each waypoint are calculated by combining empirical data, and finally, the height of the flight reaching a destination airport and the time predicted to reach the destination airport are calculated.
In this embodiment, the flight 4D flight path model building unit is further configured to: and after the flight plan is associated with the track, correcting the 4D flight track model in real time according to the real-time information of the flight track. And the 4D flight track model is corrected in real time according to the flight track real-time information, so that the accuracy of the 4D flight track model is improved.
In this embodiment, the SSR code collision avoidance unit is specifically configured to: calculating the minimum distance of the target to-be-allocated flight using the same SSR code at the current moment and the future moment according to the time, the height and the speed of the flight reaching each waypoint;
comparing the calculated minimum distance with a set distance threshold;
and if the minimum distance is greater than the set distance threshold value, judging that the two flights can be allocated to use the same SSR code.
The avoidance SSR code conflict unit calculates the minimum distance between target code-waiting flights using the same SSR codes at a current moment and a future moment (for example, after 30 minutes) based on the accurate 4D track of the flight calculated in the previous step, and if the minimum distance is greater than a set distance threshold (for example, 300 kilometers), the two code-waiting flights are considered to be allocated to use the same SSR codes, and the two flights are considered not to have SSR code conflict. Under the precondition of ensuring that flights do not conflict directly with each other, the same SSR code is allowed to be allocated to a plurality of flights to be used simultaneously, so that the overall use efficiency of SSR code resources is improved to the maximum extent.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (8)
1.A method for centralized distribution of secondary radar responder codes, the method comprising:
building a distribution system in an SSR code set, wherein the distribution system in the SSR code set is used for carrying out centralized management and centralized distribution on available SSR code resources in a large airspace;
establishing a flight 4D flight path model in a distribution system in an SSR code set;
the distribution system in the SSR code set calculates and avoids SSR code conflicts by utilizing a 4D flight path model of flights in a service airspace range, and calculates that the same SSR code can be distributed to a plurality of flights to be distributed for use;
the distribution system in the SSR code set performs information interaction with the ATC system in a set data message form, and sends a distribution result to the corresponding ATC system;
the specific method for establishing the flight 4D flight path model comprises the following steps:
acquiring FPL message information;
analyzing the airway according to the FPL message information, and analyzing the airway string into airway points to obtain a complete airway point string of the flight along the flight route;
analyzing the terminal area in the service airspace range to obtain a complete flight track point sequence containing departure procedure points/arrival procedure points;
and calculating a flight profile by combining the empirical data, the flight performance data of the airplane and the high-altitude wind data, and calculating the time, the height and the speed of the flight reaching each waypoint to obtain a 4D track model of the flight.
2. The method for secondary radar transponder code centralized assignment as recited in claim 1, further comprising, after the step of obtaining a 4D flight trajectory model of the flight: and after the flight plan is associated with the track, correcting the 4D flight track model in real time according to the real-time information of the flight track.
3. A method for centralized distribution of SSR codes according to claim 2, wherein said specific method for avoiding SSR code collisions by calculation of a 4D flight trajectory model for all flights in the service airspace range by a distribution system comprises:
calculating the minimum distance of the target to-be-allocated flight using the same SSR code at the current moment and the future moment according to the time, the height and the speed of the flight reaching each waypoint;
comparing the calculated minimum distance with a set distance threshold;
and if the minimum distance is greater than the set distance threshold value, judging that the two flights can be allocated to use the same SSR code.
4. The method for centralized distribution of SSR codes according to claim 1, wherein said data message form comprises: requesting to distribute an SSR code report, requesting to release the SSR code report, distributing the SSR code report, recycling the SSR code report and replacing the SSR code report.
5. A system for centralized distribution of secondary radar responder codes is characterized by comprising a distribution system construction unit, a flight 4D flight path model construction unit, an SSR code collision avoidance unit and an information interaction unit in an SSR code set,
the SSR code set distribution system construction unit is used for constructing an SSR code set distribution system, and the SSR code set distribution system is used for performing centralized management and centralized distribution on available SSR code resources in a large airspace;
the flight 4D flight path model establishing unit is used for establishing a flight 4D flight path model;
the SSR code collision avoidance unit is used for calculating SSR code collision avoidance by using a 4D flight track model of flights in a service airspace range, and calculating the same SSR code which can be distributed to a plurality of flights to be coded for use;
the information interaction unit is used for performing information interaction with the ATC system in a set data message form;
the flight 4D flight path model establishing unit is specifically configured to:
acquiring FPL message information;
analyzing the airway according to the FPL message information, and analyzing the airway string into airway points to obtain a complete airway point string of the flight along the flight route;
analyzing the terminal area in the service airspace range to obtain a complete flight track point sequence containing departure procedure points/arrival procedure points;
and calculating a flight profile by combining the empirical data, the flight performance data of the airplane and the high-altitude wind data, and calculating the time, the height and the speed of the flight reaching each waypoint to obtain a 4D track model of the flight.
6. The system for centralized distribution of secondary radar transponder code according to claim 5, wherein the flight 4D flight trajectory model building unit is further configured to: and after the flight plan is associated with the track, correcting the 4D flight track model in real time according to the real-time information of the flight track.
7. System for centralized distribution of SSR code according to claim 6, characterized in that said SSR code collision avoidance unit is specifically adapted to: calculating the minimum distance of the target to-be-allocated flight using the same SSR code at the current moment and the future moment according to the time, the height and the speed of the flight reaching each waypoint;
comparing the calculated minimum distance with a set distance threshold;
and if the minimum distance is greater than the set distance threshold value, judging that the two flights can be allocated to use the same SSR code.
8. The system for centralized distribution of SSR codes according to claim 7, wherein said datamessage form comprises: requesting to distribute an SSR code report, requesting to release the SSR code report, distributing the SSR code report, recycling the SSR code report and replacing the SSR code report.
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