CN111277677B - ADS-B-based aircraft address code conflict detection method and system - Google Patents
ADS-B-based aircraft address code conflict detection method and system Download PDFInfo
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- CN111277677B CN111277677B CN202010070661.7A CN202010070661A CN111277677B CN 111277677 B CN111277677 B CN 111277677B CN 202010070661 A CN202010070661 A CN 202010070661A CN 111277677 B CN111277677 B CN 111277677B
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Abstract
The invention discloses a method and a system for detecting 24-bit address code conflict of an aircraft based on ADS-B, comprising the steps of receiving an S mode message issued by the aircraft and obtaining the 24-bit address code of the S mode message; searching aircraft information matched with the 24-bit address code in a pre-established target database; judging the type of the S-mode message based on the aircraft information, and when the type of the S-mode message is an S-mode position message, calculating position information through CPR decoding; determining a target location of a 24-bit address code collision based on the location information; and determining the effective state information of the message according to the conflict identifier added to the target position of the 24-bit address code conflict. The scheme can accurately detect the conflicting 24-bit address code target at the ADS-B and multipoint positioning data source ends.
Description
Technical Field
The invention belongs to the technical field of aviation control, and particularly relates to an ADS-B-based aircraft address code conflict detection method and system.
Background
In recent years, ADS-B and multilateration have been increasingly adopted domestically as new monitoring technologies and brought to the foreground of technology applications. ADS-B and multipoint positioning are based on processing aircraft S mode signals to provide real-time traffic situation information to controllers. The S mode signal mainly comprises information such as the position, the altitude, the speed, the course, the identification number and the like of the aircraft. The information plays an important role in ensuring the safe implementation of civil aviation air traffic control on command tasks. The most critical of the S-mode signals is the position information of the aircraft. Accurate processing, and analyzing the location information in the S-mode message is particularly important in surveillance technology.
Nowadays, according to the international civil aviation organization, each aircraft in the world is allocated with a unique 24-bit address code, and the 24-bit address code information is contained in an S mode signal issued by an aircraft transponder. Therefore, when the ground receiving station performs data processing, the conventional method is to directly judge which aircraft issued the data by using a 24-bit address code, generate a corresponding target message and send the target message to the rear-end automation system. And then the automatic system is compared with other data to judge whether the target is normal.
However, there are problems in that:
1) when an S-mode transponder of airborne equipment fails, a 24-bit address code issued by an aircraft is wrong, which may cause the target to conflict with 24-bit address codes of other normal aircraft, and if the aircraft target is distinguished by simply using 224-bit address codes, wrong data association may be caused, which may cause false targets on a data source and target loss.
2) Multipoint positioning and ADS-B send wrong target information to an automation system due to 24-bit address code conflict caused by airborne equipment problems, so that the back-end automation system cannot merge normal data, a controller needs to confirm manually, and certain risk is caused to normal control services.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an ADS-B-based aircraft 24-bit address code conflict detection method and system, when an aircraft issues an incorrect 24-bit address code due to airborne equipment and conflicts with other aircraft 24-bit address codes, the target of detecting 24-bit address code conflict can be distinguished from a data source (ADS-B, multipoint positioning) without comparison and verification with other data sources, and an error mark is added in a message to inform a rear-end automation system. Therefore, the problems of false targets and target loss on a data source caused by wrong data association are solved; providing accurate data support for the back end.
The invention solves the technical problems by the following technical means:
an ADS-B-based aircraft 24-bit address code conflict detection method comprises the following steps:
receiving an S mode message issued by an aircraft, and acquiring a 24-bit address code of the S mode message;
searching aircraft information matched with the 24-bit address code in a pre-established target database;
judging the type of an S-mode message based on the aircraft information, and when the type of the S-mode message is an S-mode position message, decoding and resolving position information through CPR (CPR);
determining a target location of a 24-bit address code collision based on the location information;
and determining the effective state information of the message according to the conflict identifier added to the target position of the 24-bit address code conflict.
Preferably, the pre-establishing of the target database includes:
checking pre-collected historical data to obtain aircraft information;
storing the aircraft information passing the verification, and establishing a first target database;
storing the aircraft information which fails to pass the verification, and establishing a second target database;
a target database is obtained that is comprised of a first target database and a second target database.
Preferably, the S-mode packet includes: position, altitude, speed, heading, and identification number information of the aircraft.
Further, the determining the S-mode message type based on the aircraft information includes:
and extracting the 24-bit address code of the S-mode message, searching a target aircraft corresponding to the same address code in a first target database, and determining the type of the S-mode message according to the digit length of the designated field.
Preferably, the determination of the S-mode message class based on aircraft information is performed
When the type of the S-mode message is an S-mode position message, the decoding and resolving the position information by CPR includes:
performing CPR decoding initialization on the S-mode position message, and judging whether track initiation of a target aircraft issuing the S-mode position message is completed or not; if not, executing track initiation of the target aircraft; and if the verification is finished, performing reliability verification on the S-mode position messages continuously sent by the same target aircraft at the next moment.
Further, the performing reliability check on the S-mode position messages continuously sent by the same target aircraft at the next time includes:
when the S-mode position message sent by the same target aircraft is received again, the longitude and latitude information successfully decoded at the previous moment is used as a reference point, and CPR local decoding is adopted to solve the message position information of the current S-mode position message until the accuracy threshold of the target initial position is met.
Further, the executing the track starting step of the target aircraft specifically includes:
when the cache contains two pairs of S-mode position messages with different parity attributes, performing CPR global decoding on a first pair of parity messages issued by the target aircraft to obtain a first global decoding analysis position;
performing global decoding on the second pair of parity messages again to obtain a second global decoding analysis position;
using the first global decoding and analyzing position as a reference point, and performing CPR local decoding to obtain first CPR local decoding longitude and latitude;
judging whether the distance difference between the first CPR local decoding longitude and latitude and the second global decoding analysis position is smaller than a preset threshold value or not, and finishing track initiation of the target aircraft when the distance difference between the first CPR local decoding longitude and latitude and the second global decoding analysis position is smaller than the preset threshold value; if the address code is over, the information in the message is stored in a 24-bit address code conflict list.
Further, the obtaining the first global decoding resolution location comprises:
a, when a target aircraft issues a pair of S-mode position messages, performing CPR global decoding on the S-mode position messages; if the decoding is successful, turning to the step c;
b, if the decoding fails, waiting for receiving S-mode position messages issued by the same target aircraft, and performing CPR global decoding again until the decoding succeeds when parity attributes of the S-mode position messages continuously sent by the same target aircraft are different from each other, so as to obtain longitude and latitude information of the target aircraft;
and c, caching the currently acquired latitude and longitude information of the target aircraft, and taking the latitude and longitude information as a first global decoding and analyzing position.
Preferably, the determining the target position of the 24-bit address code collision based on the position information includes:
searching the 24-bit address code conflict list in a second target database for historical data which are the same as the 24-bit address codes in the 24-bit address code conflict list, defining the aircraft corresponding to the historical data as a suspected target aircraft, and storing the suspected target aircraft in the second target database; when the data volume in the second target database exceeds the upper limit, restarting the flight path of the target aircraft, and decoding and resolving the position information through CPR;
and performing 24-bit address code consistency matching on the successfully decoded position information and the first target database, defining the target aircraft containing the 24-bit address code in the first target database and successfully matched in consistency as a 24-bit address code conflict, and marking conflict target identifiers for the two aircraft.
An ADS-B based aircraft 24-bit address code collision detection system comprising:
the acquisition module is used for receiving an S mode message issued by the aircraft and acquiring a 24-bit address code of the S mode message;
the searching module is used for searching the aircraft information matched with the 24-bit address code in a pre-established target database;
the analysis module is used for judging the type of the S-mode message based on the aircraft information, and when the type of the S-mode message is an S-mode position message, the position information is resolved through CPR decoding;
a first determining module for determining a target location of a 24-bit address code collision based on the location information;
and the second determining module is used for determining the effective state information of the message according to the conflict identifier added to the target position of the 24-bit address code conflict.
The invention has the beneficial effects that:
the invention provides an ADS-B-based aircraft 24-bit address code conflict detection method and system, which can accurately detect a conflicting 24-bit address code target at ADS-B and multipoint-positioned data source ends. When the aircraft issues an erroneous 24-bit address code due to airborne equipment and conflicts with other aircraft 24-bit address codes, under the condition of not carrying out comparison and verification with other data sources, the target of detecting 24-bit address code conflict is distinguished from the data source (ADS-B, multipoint positioning) per se, and an error mark is added in a message to inform a rear-end automation system. Therefore, the problems of false targets and packet loss generated on a data source due to wrong data association are solved, and accurate data support is provided for the rear end.
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 flowchart of a method for detecting 24-bit address code collision of an aircraft based on ADS-B according to an embodiment of the present invention;
fig. 2 is a flowchart of an S-mode packet processing method provided in the embodiment of the present invention;
FIG. 3 is a flowchart of a CPR decode initialization method provided in an embodiment of the present invention;
figure 4 is a flow chart of an aircraft target CPR initiation check provided in an embodiment of the present invention;
FIG. 5 is a flow chart illustrating the decoding of a successful post-initiation position of an aircraft provided in an embodiment of the present invention;
FIG. 6 is a flow chart of suspect data processing provided in an embodiment of the present invention;
fig. 7 is a flow chart of data output provided in the embodiment of the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
In order to specifically understand the technical solutions provided by the present invention, the technical solutions of the present invention will be described and illustrated in detail in the following examples. It is apparent that the embodiments provided by the present invention are not limited to the specific details familiar to those skilled in the art. The following detailed description of the preferred embodiments of the invention is intended to provide further embodiments of the invention in addition to those described herein.
As shown in fig. 1, a specific embodiment of the present invention relates to a method for detecting 24-bit address code collision of an aircraft based on ADS-B, including:
s1, receiving an S mode message issued by the aircraft, and acquiring a 24-bit address code of the S mode message;
s2, searching the aircraft information matched with the 24-bit address code in a pre-established target database;
s3, judging the type of the S-mode message based on the aircraft information, and when the type of the S-mode message is an S-mode position message, decoding and resolving position information through CPR;
s4 determining a target location of the 24-bit address code collision based on the location information;
s5, according to the conflict identifier added at the destination position of 24-bit address code conflict, determining the effective state information of the message.
In step S2, the pre-establishing of the target database includes:
checking pre-collected historical data to obtain aircraft information;
storing the aircraft information passing the verification, and establishing a first target database;
storing the aircraft information which fails to pass the verification, and establishing a second target database;
a target database is obtained that is comprised of a first target database and a second target database.
Wherein the S-mode packet includes: position, altitude, speed, heading, and identification number information of the aircraft.
In step S3, determining the S-mode message type based on the aircraft information includes:
and extracting the 24-bit address code of the S-mode message, searching a target aircraft corresponding to the same address code in a first target database, and determining the type of the S-mode message according to the digit length of the designated field.
In step S4, the S-mode packet type is determined based on the aircraft information, and when the S-mode packet type is an S-mode position packet, the decoding and resolving the position information by CPR includes:
performing CPR decoding initialization on the S-mode position message, and judging whether track initiation of a target aircraft issuing the S-mode position message is completed or not; if not, executing track initiation of the target aircraft; and if the verification is finished, performing reliability verification on the S-mode position messages continuously sent by the same target aircraft at the next moment.
The reliability check of the S-mode position messages continuously sent by the same target aircraft at the next moment comprises the following steps:
when the S-mode position message sent by the same target aircraft is received again, the longitude and latitude information successfully decoded at the previous moment is used as a reference point, and CPR local decoding is adopted to solve the message position information of the current S-mode position message until the accuracy threshold of the target initial position is met.
The track starting step for executing the target aircraft specifically comprises the following steps:
1. when the cache contains two pairs of S-mode position messages with different parity attributes, performing CPR global decoding on a first pair of parity messages issued by the target aircraft to obtain a first global decoding analysis position;
said obtaining a first global decoding resolution location comprises:
a, when a target aircraft issues a pair of S-mode position messages, performing CPR global decoding on the S-mode position messages; if the decoding is successful, turning to the step c;
b, if the decoding fails, waiting for receiving S-mode position messages issued by the same target aircraft, and performing CPR global decoding again until the decoding succeeds when parity attributes of the S-mode position messages continuously sent by the same target aircraft are different from each other, so as to obtain longitude and latitude information of the target aircraft;
and c, caching the currently acquired latitude and longitude information of the target aircraft, and taking the latitude and longitude information as a first global decoding and analyzing position.
2. Performing global decoding on the second pair of parity messages again to obtain a second global decoding analysis position;
using the first global decoding and analyzing position as a reference point, and performing CPR local decoding to obtain first CPR local decoding longitude and latitude;
judging whether the distance difference between the first CPR local decoding longitude and latitude and the second global decoding analysis position is smaller than a preset threshold value or not, and finishing track initiation of the target aircraft when the distance difference between the first CPR local decoding longitude and latitude and the second global decoding analysis position is smaller than the preset threshold value; if the address code is over, the information in the message is stored in a 24-bit address code conflict list.
In step S4, determining the target location of the 24-bit address code collision based on the location information includes:
searching the 24-bit address code conflict list in a second target database for historical data which are the same as the 24-bit address codes in the 24-bit address code conflict list, defining the aircraft corresponding to the historical data as a suspected target aircraft, and storing the suspected target aircraft in the second target database; when the data volume in the second target database exceeds the upper limit, restarting the flight path of the target aircraft, and decoding and resolving the position information through CPR;
and performing 24-bit address code consistency matching on the successfully decoded position information and the first target database, defining the target aircraft containing the 24-bit address code in the first target database and successfully matched in consistency as a 24-bit address code conflict, and marking conflict target identifiers for the two aircraft.
Based on the same technical concept, the specific embodiment of the invention also provides an aircraft 24-bit address code collision detection system based on ADS-B, which comprises:
the acquisition module receives an S-mode message issued by the aircraft and acquires a 24-bit address code of the S-mode message;
the searching module is used for searching the aircraft information matched with the 24-bit address code in a pre-established target database;
the analysis module is used for judging the type of the S-mode message based on the aircraft information, and when the type of the S-mode message is an S-mode position message, the position information is resolved through CPR decoding;
a first determining module for determining a target location of a 24-bit address code collision based on the location information;
and the second determining module is used for determining the effective state information of the message according to the conflict identifier added to the target position of the 24-bit address code conflict.
Example 1:
based on the specific implementation scheme, a method for detecting and processing 24-bit address code conflict of an aircraft based on multipoint positioning and ADS-B is provided. When the receiver receives an S-mode message, firstly, extracting a 24-bit address code of the message, then finding out historical data information of the target from a normal target database according to the extracted 24-bit address code, judging the type of the message according to the first 5 data bits of the ME field, and if the message is a position message, attempting CPR decoding to solve the position information. The general flow is shown in fig. 2.
In the CPR decoding attempt, S-mode position messages issued by an aircraft are divided into odd messages and even messages. For the same aircraft target, only one odd message and one even message can correctly resolve the current longitude and latitude information of the aircraft when CPR global decoding is used. The CPR local decoding needs to provide a reference position and any odd message or even message to analyze the longitude and latitude information represented by the message.
When the aircraft issues the position message information for the first time, the position information of the target cannot be analyzed through global decoding, and only when the same target issues a pair of parity messages continuously, a target can be analyzed, so when the target performs CPR decoding attempt, if the target fails, the current message information can be stored, and when the other type of message (the other one of the odd message or the even message) of the target arrives for the second time, the normal position analysis can be performed.
It is determined whether the current target is properly initiated at the time the CPR decode attempt is made. If the target has not completed normal initiation, then target initiation is performed according to the flow shown in FIG. 3:
when the target has stored two pairs of parity messages in the normal database, a CPR algorithm can be performed to resolve the latitude and longitude and initiate the target. Normally, one pair of parity messages can resolve the longitude and latitude, and the reason for using the two pairs of parity messages is to add rationality judgment to verify whether the initial validity is normal. A kind of reliability verification is added at the beginning of the target to ensure that the starting position is correct. As shown in fig. 4, the method is as follows:
when a first pair of parity messages issued by an aircraft of a first normal target can use CPR global decoding to resolve a position for the first time (G1), when a second pair of parity messages is subjected to second global decoding to obtain a second global decoding position (G2), meanwhile, a position G1 resolved by the first global decoding is used as a reference point to use local decoding to obtain a first CPR local decoding longitude and latitude (L1), and when the distance difference between the L1 position and the G2 position is less than 5 cm, the target is considered to be successful in starting.
After the starting is successful, all the position messages sent by the target aircraft use local decoding to analyze the position information, and the selection of the reference point is the position of the last successful decoding. The logical structure is shown in fig. 5.
When a new message is received by a receiver, the 24-bit address code of the message is firstly analyzed, then the historical data of the same 24-bit address code target is searched from a normal target database, if the target is started, CPR local decoding is carried out on the current message by using a reference point, after the analyzed position, whether the distance between the analyzed position of the current message and the position of the reference point is greater than a detection threshold or not is calculated, if the distance is less than the detection threshold, the current message is output as a normal target, and if the distance is greater than the detection threshold, the current message is regarded as a suspected target, the target is not updated, and the information in the current message is updated and stored into a 24-bit address code conflict suspicion list. For an aerial target, the detection threshold is set to 6 nautical miles for an aerial target because the aerial vehicle is faster, and 2.5 nautical miles for a ground target that is slower. And uses the message to perform a CPR decode attempt, the flow chart is shown in fig. 6:
CPR decode attempts on suspect data are processed as in the normal data processing method, following the flow of fig. 2. When the database is suspected to have enough data stored therein, and the target can be normally restarted and subjected to CPR verification, the normal target database is detected, and if the target with the same 24-bit address code exists in the normal target database, the condition that the two targets conflict with each other is marked at the same time. And simultaneously adds conflicting object identifiers to the database of two objects (same 24-bit address code). If the target with the same 24-bit address code can not be found in the normal target database, the target is directly cut from the suspected database to the normal target database to output the target which is not marked as the conflict 24-bit code. If the position is successfully analyzed, a data target report is output, when the data is output, the conflict identifier of the current target is judged, if the conflict identifier conflicts with the conflict identifier, the message is marked during output, and other relevant information is not output
The process flow of the status message information is shown in fig. 7, because it cannot be distinguished from which target the statuses come from.
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. A24-bit address code collision detection method for an aircraft based on ADS-B is characterized by comprising the following steps:
receiving an S mode message issued by an aircraft, and acquiring a 24-bit address code of the S mode message;
searching aircraft information matched with the 24-bit address code in a pre-established target database;
judging the type of an S-mode message based on the aircraft information, and when the type of the S-mode message is an S-mode position message, decoding and resolving position information through CPR (CPR);
determining a target location of a 24-bit address code collision based on the location information;
determining effective state information of the message according to a conflict identifier added to a target position of 24-bit address code conflict;
the method for judging the type of the S-mode message based on the aircraft information comprises the following steps of when the type of the S-mode message is an S-mode position message, decoding and resolving position information through CPR (CPR solution):
performing CPR decoding initialization on the S-mode position message, and judging whether track initiation of a target aircraft issuing the S-mode position message is completed or not; if not, executing track initiation of the target aircraft; if the position information is finished, carrying out reliability check on the S-mode position messages continuously sent by the same target aircraft at the next moment;
the track starting step of executing the target aircraft specifically comprises the following steps:
when the cache contains two pairs of S-mode position messages with different parity attributes, performing CPR global decoding on a first pair of parity messages issued by the target aircraft to obtain a first global decoding analysis position;
performing global decoding on the second pair of parity messages again to obtain a second global decoding analysis position;
using the first global decoding and analyzing position as a reference point, and performing CPR local decoding to obtain first CPR local decoding longitude and latitude;
judging whether the distance difference between the first CPR local decoding longitude and latitude and the second global decoding analysis position is smaller than a preset threshold value or not, and finishing track initiation of the target aircraft when the distance difference between the first CPR local decoding longitude and latitude and the second global decoding analysis position is smaller than the preset threshold value; if the address code is over, the information in the message is stored in a 24-bit address code conflict list.
2. The method of claim 1, wherein the pre-establishing of the target database comprises:
checking pre-collected historical data to obtain aircraft information;
storing the aircraft information passing the verification, and establishing a first target database;
storing the aircraft information which fails to pass the verification, and establishing a second target database;
a target database is obtained that is comprised of a first target database and a second target database.
3. The method of claim 1, wherein the S-mode packet comprises: position, altitude, speed, heading, and identification number information of the aircraft.
4. The method of claim 2, wherein the determining an S-mode message type based on aircraft information comprises:
and extracting the 24-bit address code of the S-mode message, searching a target aircraft corresponding to the same address code in a first target database, and determining the type of the S-mode message according to the digit length of the specified field.
5. The method of claim 1, wherein the performing the reliability check on the S-mode location messages that are continuously sent by the same target aircraft at the next time comprises:
when the S-mode position message issued by the same target aircraft is received again, the longitude and latitude information successfully decoded at the previous moment is used as a reference point, and CPR local decoding is adopted to solve the message position information of the current S-mode position message until the accuracy threshold of the target initial position is met.
6. The method of claim 1, wherein obtaining the first global decoding resolution location comprises:
a, when a target aircraft issues a pair of S-mode position messages, performing CPR global decoding on the S-mode position messages; if the decoding is successful, turning to the step c;
b, if the decoding fails, waiting for receiving S-mode position messages issued by the same target aircraft, and executing CPR global decoding again until the decoding succeeds when parity attributes of the S-mode position messages continuously sent by the same target aircraft are different from each other, so as to obtain longitude and latitude information of the target aircraft;
and c, caching the currently acquired latitude and longitude information of the target aircraft, and taking the latitude and longitude information as a first global decoding and analyzing position.
7. The method of claim 1, wherein determining the target location of the 24-bit address code collision based on the location information comprises:
searching the 24-bit address code conflict list in a second target database for historical data which are the same as the 24-bit address codes in the 24-bit address code conflict list, defining the aircraft corresponding to the historical data as a suspected target aircraft, and storing the suspected target aircraft in the second target database; when the data volume in the second target database exceeds the upper limit, restarting the flight path of the target aircraft, and decoding and resolving the position information through CPR;
and performing 24-bit address code consistency matching on the successfully decoded position information and the first target database, defining the target aircraft containing the 24-bit address code in the first target database and successfully matched in consistency as a 24-bit address code conflict, and marking conflict target identifiers for the two aircraft.
8. An ADS-B based aircraft 24-bit address code collision detection system based on the ADS-B aircraft 24-bit address code collision detection method of claim 1, comprising:
the acquisition module is used for receiving an S mode message issued by the aircraft and acquiring a 24-bit address code of the S mode message;
the searching module is used for searching the aircraft information matched with the 24-bit address code in a pre-established target database;
the analysis module is used for judging the type of the S-mode message based on the aircraft information, and when the type of the S-mode message is an S-mode position message, the position information is resolved through CPR decoding;
a first determining module for determining a target location of a 24-bit address code collision based on the location information;
and the second determining module is used for determining the effective state information of the message according to the conflict identifier added to the target position of the 24-bit address code conflict.
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