CN100596338C - Automatic identification method of air traffic control radar data - Google Patents

Abstract

The invention provides an air control radar data automatically checking method, belonging to the automation of air traffic, the air control radar data is classified to judge the format of radar data by means of whether the length of the message is fixed or not and the checking types adopted by the radar message, so that distinguishing the types of trace point or flight track in the radar report. Whether the length of message is fixed or not comprises two types: a variation in the length of the target message, a fixed format and length of the target message. According to the checking types adopted, the checking mechanism comprises two types: a using CRC checking mechanism and a checking mechanism without using CRC. Among the radar data with a variation in the length of the target message, according to the internal structure differences of the messages, further analyzing the format of radar data and reporting the types of trace point or flight trace. The invention has the advantages of simplifying the configuration of accessed radar parameters, reducing the automatic system problems caused by the configuration errors, providing an accessing prerequisite for the interconnection of radar data and expanding the air control automatic system in future, capability of wide application in the front-end accessing equipment in the air control automatic system and wide application prospect.

Description

Automatic identification method of air traffic control radar data

Technical field

The invention relates to air traffic automation, in particular to an automatic identification method for air traffic control radar data connected to an air traffic control automation system.

Background technique

The ATC radars currently used in my country's civil aviation system include Raytheon, Thomson/Thales, Alenia, Toshiba, NEC, Telephonics, WestingHouse, Siemens and other systems, from many different manufacturers. However, each manufacturer does not have a unified air traffic control radar data interface control file, which causes different data formats to be used by different air traffic control radars, and causes adaptability problems for the access equipment of the control center automation system. For each control automation system supplier, before connecting the air traffic control radar signal to the system, it is necessary to clarify the format of the air traffic control radar connected to the system, and decode the message according to the interface control file of the corresponding format. Some control automation systems even directly limit the access format to one or two kinds of air traffic control radars, which limits the future expansion of radar networking and control automation systems.

Air traffic control radar manufacturers and control automation system manufacturers at home and abroad are aware of these limitations and have begun to study corresponding solutions. For example, Eurocontrol proposed an Asterix format. Currently, Raytheon, Thomson/Thales air traffic control radar manufacturers provide The air traffic control radar data all meet the Asterix format interface control file. However, since domestic civil aviation is still using a large number of other air traffic control radar data in different formats, the above-mentioned relatively limited solutions are far from meeting the needs of my country's air traffic control.

Contents of the invention

The purpose of the present invention is to provide a convenient and quick identification of various current air traffic control radar data formats, thereby providing an automatic identification method for air traffic control radar data in an accurate configuration mode before accessing the control automation system, and adapting to my country's air traffic control business It lays the foundation for the future expansion of radar networking and control automation.

The object of the present invention is achieved like this: a kind of air traffic control radar data automatic recognition method is characterized in that: whether the air traffic control radar data is fixed according to the length of the message and according to the verification method adopted in the radar message to classify and judge The format and report of radar data distinguishes the point track/track type of radar report: according to whether the message length is fixed or not, it can be divided into two types: air traffic control radar data with variable target message length and air traffic control radar data with fixed format and length; The verification methods used in the message are divided into two types: using CRC checking mechanism and using non-CRC checking mechanism; in the air traffic control radar data with variable target length, the radar data is further analyzed according to the difference in the internal structure of the message format and report the track/track type.

The classification of the air traffic control radar data is carried out according to the following steps: carry out parity check on the radar data, if it is an odd message, it is judged as a WestingHouse radar spot message; if the message does not meet the parity check, perform a CRC check, If it conforms to the CRC16 check polynomial, it is judged as a Toshiba radar dot trace message; if it matches the CRC-CCITT check polynomial, the length of the message is checked, and if it is equal to 5 or 13, it is judged as an NEC dot trace message; if it is equal to 8 or 14, it is judged It is a Telephonic dot message; for other messages, it parses a data message.

According to the different internal structures of the radar data, the air traffic control radar data analysis is carried out according to the following steps: analyze the message data, whether it conforms to the UAP table data item and the message length of Asterix, and if it meets, it is judged to be an Asterix format message, If it is an Asterix message, further analyze the I001/020 field to find out whether it is a point trace message or a track message; if it does not meet the Asterix UAP table data items and message length, read 4 bytes, the third word The section is PWN, and the fourth byte is TWN, then further read whether the length of the subsequent message is equal to 12*PWN+28*TWN, if so, then judge the Alenia with PWN point trace messages and TWN track messages Radar message; if the length of the read follow-up message is not equal to 12*PWN+28*TWN, then judge whether it is a Siemens message, if so, find out the point trace message and track according to the attribute field of the Siemens message message, if not, it is judged to be other new radar messages.

The polynomial for CRC16 check is X ¹⁶ +X ¹⁵ +X ² +1, and the polynomial for CRC-CCITT check is X ¹⁶ +X ¹² +X ⁵ +1.

The beneficial effects of the present invention are:

The automatic recognition of the air traffic control radars provided by various manufacturers in my country is realized, which can simplify the radar parameter configuration of the access control automation system, reduce the shortcomings that the automation system cannot handle due to unnecessary configuration errors, and lay a solid foundation for the future Realize the network of air traffic control radar data and expand the control automation system to provide access conditions. It can be widely used in the front-end access equipment of the air traffic control automation system. It has a great application prospect.

Description of drawings

Figure 1 is a flowchart of the automatic classification of ATC radar data.

Fig. 2 is a flow chart of parsing the radar data format further according to the difference in the internal structure of the message in the air traffic control radar data whose target length changes.

Detailed ways

See attached picture.

The automatic identification method of air traffic control radar data is developed and realized by using Visual C++6.0 on the Windows operating system platform. Complete the synchronous-asynchronous conversion of the received air traffic control radar data through the protocol conversion equipment, and input the asynchronous data into the air traffic control radar data automatic identification method software. The inventive software will identify according to the following steps and rules. After the identification is completed, Output the ATC radar data format type, and give the track/track characteristics of the report.

(1) Through the check code, identify the radar format of the special check method.

The WestingHouse radar format uses odd parity, the lower 12 bits are data, the 13th bit is odd parity, and the other high bits are not used.

The Toshiba radar format uses CRC16 checksum, and the checksum polynomial is X ¹⁶ +X ¹⁵ +X ² +1.

Other radar formats adopt CRC-CCITT checksum, and the polynomial is X ¹⁶ +X ¹² +X ⁵ +1.

That is to say, through different data verification methods, Toshiba radar data and WestingHouse radar data can be identified, and both are point trace reports

(2) By fixing the message length, identify the radar format of the fixed-length message.

Radar data in Asterix format, Alenia, and Siemens are of variable length, while radar data of NEC and Telephonics format are of fixed length. Among them: NEC format radar message is a fixed format message, Zhengbei report and sector report are both 5 characters Section, target report 13 bytes, for dot trace message

Telephonics format radar message is a fixed format message, Zhengbei report is 8 bytes, target report is 14 bytes, no sector report

That is, judged by the fixed length of the message, the message length is 5 bytes or 13 bytes, it is an NEC radar format message, and the message length is 8 bytes or 14 bytes, it is a Telephonics radar format message, by This can identify NEC radar data and Telephonics radar data formats, and both are dot plot reports

(3) Identify the radar format of the target message length change through internal structure analysis.

Among the three kinds of radar messages in Asterix format, Alenia and Siemens, the first two include Zhengbei report, sector report and target report. Siemens includes sector report and target report, but their formats and rules are very different. The following takes the target packet as the identification feature to describe in detail:

The target report of Asterix format radar message appears in the form of User Application Profile (UAP: User Application Profile), that is, the specific meaning of each data message item is first specified, and in the real-time radar data message, according to the actual situation, through the user The index field of the related table indicates the data message items in this message. The standard track user correlation table is shown in Table 1 Asterix format radar track message user correlation table:

Table 1:

index datagram item Information description message length 1234567FX I001/010I001/020I001/161I001/040I001/042I001/200I001/070---- Data source indicates target report description track number measured polar coordinate position calculated Cartesian coordinate position calculated aircraft speed 3/A mode code field extension identification 21+24442- 8910 I001/090I001/141I001/130 Features of C-mode height diurnal time traces 221+

11121314FX I001/131I001/120I001/170I001/210---- Received Power Doppler Radial Velocity Track Status Track Quality Field Extension Identification 111+1+- 15161718192021FX I001/050I001/080I001/100I001/060I001/030---------- 2 Mode Code 3/A Mode Code Confidence Identification C Mode Confidence Identification 2 Mode Code Confidence Identification Warning/Error Type (Reserved) (Reserved) Field Extension Identification 22421+--- twenty two I001/150 Appear X pulse 1

Through the I001/020 data message item, it can be identified that the message type is primary track, secondary track, primary track, secondary track, primary and secondary composite track, and primary and secondary composite track.

The first 4 bytes in the Alenia radar data message are used to describe the number of traces, the number of tracks and the sector number information contained in this message, followed by several fixed-format trace reports (12 bytes long) And fixed format track report (28 byte length), as shown in Table 2 Alenia radar data target message format:

Table 2:

NPL=1 means no track, NTK=1 means no track, SCT=1 means change of sector number.

The Siemens radar data message first defines the meaning of 9 data message items, and each message item is represented by 2 bytes. In the first message item of each message, indicate which message items are included in this radar message and the type of this message item, as shown in Table 3 Siemens radar data message format:

table 3:

Data items 2, 3, and 4 are mandatory items, which must be included in all messages. F5=1 means that data item 5 is included, F6=1 means that data item 6 is included, F7=1 means that data item 7 is included, Ex1= 1 means that data item 8 is included, and Ex2=1 means that data item 9 is included.

From the message type label, one can identify primary track report, primary track report, secondary track report, secondary track report, primary and secondary composite track report, primary and secondary composite track report, etc.

That is, it can automatically recognize the Asterix format, Alenia, and Siemens radar data formats through the difference in the message structure, and can identify whether the message contains a point track or a track, or both.

In summary, by the method of the present invention, the ATC radar data formats commonly used in civil aviation such as Asterix format, Alenia, Siemens, Toshiba, NEC, Telephonics, and WestingHouse can be automatically recognized, and the point track/track of the radar report can be distinguished type.

Claims (5)

1. A method for automatic identification of air traffic control radar data, characterized in that: before the air traffic control radar signal is connected to the control automation system, the air traffic control radar data is fixed according to the length of the message and according to the correction method adopted in the radar message. Classify the format of radar data and report and distinguish the point track/track type of radar report: according to whether the message length is fixed or not, it can be divided into air traffic control radar data with variable target message length and air traffic control radar with fixed format and length There are two types of data; according to the verification method used in the radar message, it is divided into two types: using the CRC check mechanism and using the non-CRC check mechanism; Differences in internal structure, parsing radar data format and reporting track/track type. 2. The air traffic control radar data automatic identification method as claimed in claim 1, characterized in that: in the air traffic control radar data of the target message length change, further according to the difference in the internal structure of the message, the analytical radar data format is Refers to judging the Asterix radar format according to the defined user-related table, judging the Alenia radar format according to the attributes and positions of the subsequent messages described in the first 4 bytes, and judging the Siemens radar format according to whether the subsequent data items described in the header exist. radar format. 3. The method for automatic identification of air traffic control radar data as claimed in claim 1, characterized in that: the classification of the air traffic control radar data is carried out according to the following steps: parity check is performed on the radar data, and if it is an odd message, it is judged as WestingHouse radar trace message; if the message does not meet the parity check, perform CRC check, if it meets the CRC16 check polynomial, it is judged as a Toshiba radar trace message; if it meets the CRC-CCITT check polynomial, check the length of the message , is equal to 5 or 13, it is judged as an NEC dot trace message; if it is equal to 8 or 14, it is judged as a Telephonic dot trace message; for other messages, it is judged as a data message. 4. The air traffic control radar data automatic identification method as claimed in claim 1, characterized in that: the said internal structure of the radar data is different, and the analysis of the air traffic control radar data is carried out according to the following steps: analyzing the message data, whether The UAP table data item and message length conforming to Asterix, if it conforms, it is judged as an Asterix format message. If it is an Asterix message, further analyze the I001/020 field to analyze whether it is a point trace message or a track message; if it does not meet Asterix UAP table data items and message length, read 4 bytes, the third byte is PWN, the fourth byte is TWN, then further read whether the subsequent message length is equal to 12*PWN+28*TWN , if so, judge whether there are Alenia radar messages with PWN point trace messages and TWN track messages; if the length of the subsequent message read is not equal to 12*PWN+28*TWN, then judge whether it is a Siemens message , if so, find out the point trace message and the track message according to the attribute field of the Siemens message, if not, then judge that it is other new radar messages. 5. The automatic identification method of air traffic control radar data as claimed in claim 3, characterized in that: the polynomial for performing CRC16 check is X ¹⁶ +X ¹⁵ +X ² +1, and the polynomial for CRC-CCITT check is X ¹⁶ +X ¹² +X ⁵ +1.

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