CN107633049B - Flight position information playback system and method - Google Patents
Flight position information playback system and method Download PDFInfo
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- CN107633049B CN107633049B CN201710839749.9A CN201710839749A CN107633049B CN 107633049 B CN107633049 B CN 107633049B CN 201710839749 A CN201710839749 A CN 201710839749A CN 107633049 B CN107633049 B CN 107633049B
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Abstract
A flight position information playback system and a flight position information playback method are provided. The system comprises a database, a data processing module, a playback control terminal and a playback display terminal; the data processing module is respectively connected with the database, the playback control terminal and the playback display terminal. The invention has the advantages that: (a) the flight position information is stored by adopting a database, and indexes are configured for the playback condition data items, so that the query speed of playback data is improved, and the real-time performance of data playback is realized; (b) displaying effective information during playback initialization, only reserving and displaying flight information of flights with position updates in specified time, including historical information of the flights, and deleting the flight information of flights without position updates in the specified time; (c) the self-adaptive time-segmented playback adopts a mode that playback cache data is read according to time segments, so that the data cache pressure of a playback control terminal is greatly reduced, the time segment length is self-adaptively adjusted along with the fast forward or slow forward of the playback, and the smoothness of the playback is guaranteed.
Description
Technical Field
The invention relates to a flight position information playback system and a playback method, which are used for playing back historical flight position information stored in a database.
Background
At present, there are multiple ways for monitoring the position information of an aircraft in a civil aviation system, the main monitoring means in an air traffic control system include a primary radar, a secondary radar and an ADS-B which is promoting implementation, and an airline company mainly adopts an ACARS POS report to realize the real-time tracking and monitoring of the flight position information. The recording and playback system of flight monitoring data can record, save and play back the flight position information. The flight position information can be played back, so that the flight operation situation can be analyzed more visually by related personnel; meanwhile, when special conditions occur in the operation process of the aircraft, the playback system can help to analyze the reasons of the special conditions, and investigation is facilitated.
Now, recording and playback of flight position information in civil aviation systems are generally realized by using a traditional recorder, and since data is stored in a hard disk in a file form, reading of file contents during playback takes a lot of time, so that the playback fast forward speed is limited, and selective playback is not facilitated, for example, only position information of a few flights or flights taking off from a certain airport are played back. Unlike conventional video or voice playback, the playback of flight position information focuses on the continuity of the historical position information of flights, that is, the historical position information of flights before the playback start time is displayed in the playback display terminal at the time of playback initialization. Meanwhile, the acquisition of the playback data needs time, and the acquisition of the data before the playback data is adopted easily causes the pause phenomenon in the playback process, so that corresponding measures are adopted to avoid unnecessary pause.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a flight position information playback system and a playback method.
In order to achieve the above object, the flight position information playback system provided by the present invention includes: the system comprises a database, a data processing module, a playback control terminal and a playback display terminal; wherein: the data processing module is respectively connected with the database, the playback control terminal and the playback display terminal.
The database 1 adopts a universal relational database including SQL Server, MySQL and Oracle.
The method for replaying the flight position information provided by the invention comprises a replay initialization stage and a double-cache replay stage; the playback initialization phase comprises the following steps performed in sequence:
step one, obtaining flight data with position update in the appointed time before the playback starting time at the S101 stage: after receiving a playback instruction of a playback control terminal, a data processing module acquires flight data with position update in a specified time before a playback starting moment from a database, wherein the specified time is 2 times of a flight position information update period, and the flight position information update period represents a time period for issuing position information by a flight;
step two, obtaining continuous historical position data of flights with position updating at S102 stage: according to the flight data with the position update obtained in the S101 stage, continuous historical position data of the flights is obtained from a database, namely all position update data of the flights from the departure time of the flight closest to the playback starting time;
step three, a stage S103 of continuously displaying the historical flight position data: sending the continuous historical position data of the flight acquired at the S102 stage to a playback display terminal and displaying the continuous historical position data by the playback display terminal;
the double-buffer playback phase comprises the following steps which are executed in sequence:
step one, dividing the playback time of the continuous historical position data of the flight into a plurality of playback time periods, and creating a playback buffer and a download buffer at the S201 stage: firstly, the playback time t of the continuous historical position data of the flight isstart—tendDividing the time length T into a plurality of playback time periods at equal intervals, wherein: t is tstartFor the playback start time, tendFor playback deadline, PiFor the current playback period, Pi+1Is the next playback period; then creating a playback cache and a download cache, wherein the playback cache is used for storing flight historical position data in the current playback time period, and the download cache is used for storing flight historical position data in the next time period to be played back;
step two, downloading the data in the first time period to a playback buffer S202 stage: during playback, firstly, the data processing module downloads the flight historical position data in the first playback time period from the database to the playback cache;
step three, starting playback data and downloading data in the next playback time period to a downloading cache S203: the data processing module acquires flight historical position data from the playback cache, sends the flight historical position data to the playback display terminal according to a preset playback speed, then the flight historical position data is played back by the playback display terminal, and then the played back flight historical position data is deleted from the playback cache; meanwhile, the historical flight position data downloading in the next playback time period is executed in parallel, and the historical flight position data obtained by downloading is stored in a downloading cache;
step four, judging whether the playback of the cache data is finished at the S204 stage: judging whether the data in the playback cache is played back completely, and if the judgment result is yes, entering the next step S205; otherwise, repeating the step;
step five, judging whether the data downloading in the next playback time period is finished or not at S205 stage: judging whether the downloading of the flight historical position data in the next playback time period is finished, and if the judgment result is yes, entering the next step S206; otherwise, repeating the step;
step six, storing the data of the download cache into a playback cache, and clearing the download cache in S206: storing the flight historical position data, which is downloaded in the download cache and is to be played back next, in the next playback time period into the playback cache, and meanwhile emptying the flight historical position data in the download cache to prepare for downloading the flight historical position data in the subsequent playback time period;
step seven, judging whether all flight historical position data are played back completely at S207 stage: judging whether the flight historical position data in the playback cache is empty or not, if so, indicating that no flight historical position data exists in the playback cache and the download cache, and ending the playback; otherwise, the next step returns to the step S203.
The flight position information recording and playback method provided by the invention has the advantages that: (a) the flight position information is stored by adopting a database, and indexes are configured for the playback condition data items, so that the query speed of playback data is improved, and the real-time performance of data playback is realized; (b) displaying effective information during playback initialization, only reserving and displaying flight information of flights with position updates in specified time, including historical information of the flights, and deleting the flight information of flights without position updates in the specified time; (c) the self-adaptive time-segmented playback adopts a mode that playback cache data is read according to time segments, so that the data cache pressure of a playback control terminal is greatly reduced, the time segment length is self-adaptively adjusted along with the fast forward or slow forward of the playback, and the smoothness of the playback is guaranteed.
Drawings
Fig. 1 is a schematic structural diagram of a flight location information playback system provided by the invention;
FIG. 2 is a flowchart of a playback initialization phase in the flight location information playback method provided by the present invention;
fig. 3 is a schematic diagram of a playback time period setting process in the flight position information playback method provided by the invention;
fig. 4 is a flow chart of a double-buffer playback stage in the flight location information playback method provided by the invention.
Detailed Description
The flight position information playback system and the flight position information playback method provided by the invention are described in detail below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the flight location information playback system provided by the present invention includes: the system comprises a database 1, a data processing module 2, a playback control terminal 3 and a playback display terminal 4; wherein: the data processing module 2 is respectively connected with the database 1, the playback control terminal 3 and the playback display terminal 4; the data processing module 2 receives flight position data including primary radar, secondary radar, ADS-B and ACARS POS reports, then fuses the flight position data and stores the flight position data into a corresponding data table which is established in advance in the database 1 in a unified structure; the data table is established according to a certain time period to avoid all data from being stored in a large table, so that the data query time is prolonged; when a data table is established, indexes are configured for data items related to playback conditions so as to improve the acquisition speed of playback data; wherein, the database 1 can adopt a universal relational database including SQL Server, MySQL and Oracle; the data processing module 2 receives a playback instruction of the playback control terminal 3, acquires data to be played back from the database 1, and sends the data to be played back to the playback display terminal 4 at a specified speed for playback; meanwhile, the data processing module 2 receives instructions including pause, start, fast forward and slow forward from the playback control terminal 3 to control the whole playback process.
The playback method using the flight position information playback system comprises a playback initialization stage and a double-cache playback stage; as shown in fig. 2, the playback initialization phase includes the following steps performed in sequence:
step one, obtaining flight data with position update in the appointed time before the playback starting time at the S101 stage: after receiving a playback instruction of the playback control terminal 3, the data processing module 2 acquires flight data with position update in a specified time before a playback starting moment from the database 1, wherein the specified time is 2 times of a flight position information update period, and the flight position information update period represents a time period for issuing position information by a flight;
step two, obtaining continuous historical position data of flights with position updating at S102 stage: according to the flight data with the position update obtained in the S101 stage, continuous historical position data of the flights is obtained from the database 1, namely all position update data of the flights from the departure time of the flight closest to the playback starting time;
step three, a stage S103 of continuously displaying the historical flight position data: and sending the continuous historical position data of the flights acquired in the S102 stage to the playback display terminal 4 and displaying the data by the playback display terminal 4.
As shown in fig. 4, the double-buffer playback phase includes the following steps performed in sequence:
step one, dividing the playback time of the continuous historical position data of the flight into a plurality of playback time periods, and creating a playback buffer and a download buffer at the S201 stage: as shown in FIG. 3, the playback time t of the continuous historical position data of the flight is first determinedstart—tendDividing the time interval into a plurality of playback time intervals according to the time interval length T, wherein: t is tstartFor the playback start time, tendFor playback deadline, PiFor the current playback period, Pi+1Is the next playback period; then creating a playback cache and a download cache, wherein the playback cache is used for storing flight historical position data in the current playback time period, and the download cache is used for storing flight historical position data in the next time period to be played back;
step two, downloading the data in the first time period to a playback buffer S202 stage: during playback, firstly, the data processing module 2 downloads the flight historical position data in the first playback time period from the database 1 to a playback cache;
step three, starting playback data and downloading data in the next playback time period to a downloading cache S203: the data processing module 2 acquires flight historical position data from the playback cache, sends the flight historical position data to the playback display terminal 4 according to a preset playback speed, then the flight historical position data is played back by the playback display terminal 4, and then the played back flight historical position data is deleted from the playback cache; meanwhile, the historical flight position data downloading in the next playback time period is executed in parallel, and the historical flight position data obtained by downloading is stored in a downloading cache;
step four, judging whether the playback of the cache data is finished at the S204 stage: judging whether the data in the playback cache is played back completely, and if the judgment result is yes, entering the next step S205; otherwise, repeating the step;
step five, judging whether the data downloading in the next playback time period is finished or not at S205 stage: judging whether the downloading of the flight historical position data in the next playback time period is finished, and if the judgment result is yes, entering the next step S206; otherwise, repeating the step;
step six, storing the data of the download cache into a playback cache, and clearing the download cache in S206: storing the flight historical position data, which is downloaded in the download cache and is to be played back next, in the next playback time period into the playback cache, and meanwhile emptying the flight historical position data in the download cache to prepare for downloading the flight historical position data in the subsequent playback time period;
step seven, judging whether all flight historical position data are played back completely at S207 stage: judging whether the flight historical position data in the playback cache is empty or not, if so, indicating that no flight historical position data exists in the playback cache and the download cache, and ending the playback; otherwise, the next step returns to the step S203.
The playback time interval length T in the double-buffer playback stage is adaptively adjusted according to the playback speed, and the adjusting method comprises the following steps: and updating the playback time segment length T of the segmented playback in equal proportion according to the playback speed specified by the playback control terminal 3, and if the playback speed is n times of the normal speed, changing the playback time segment length T into nT so as to avoid that the data volume requirement of one-time playback is larger than the data volume of the playback cache and guarantee the smoothness of playback.
Claims (1)
1. A playback method of a flight position information playback system is characterized in that: the flight position information playback system includes: the system comprises a database (1), a data processing module (2), a playback control terminal (3) and a playback display terminal (4); wherein: the data processing module (2) is respectively connected with the database (1), the playback control terminal (3) and the playback display terminal (4);
the method is characterized in that: the playback method comprises a playback initialization stage and a double-cache playback stage; the playback initialization phase comprises the following steps performed in sequence:
step one, obtaining flight data with position update in the appointed time before the playback starting time at the S101 stage: after receiving a playback instruction of a playback control terminal (3), a data processing module (2) acquires flight data with position update in a specified time before a playback starting time from a database (1), wherein the specified time is 2 times of a flight position information update period, and the flight position information update period represents a time period for issuing position information by a flight;
step two, obtaining continuous historical position data of flights with position updating at S102 stage: according to the flight data with the position update obtained in the S101 stage, continuous historical position data of the flights is obtained from a database (1), namely all position update data of the flights from the departure time of the flight closest to the playback starting time;
step three, a stage S103 of continuously displaying the historical flight position data: sending the continuous historical position data of the flight acquired in the S102 stage to a playback display terminal (4) and displaying the continuous historical position data by the playback display terminal (4);
the double-buffer playback phase comprises the following steps which are executed in sequence:
step one, dividing the playback time of the continuous historical position data of the flight into a plurality of playback time periods, and creating a playback buffer and a download buffer at the S201 stage: firstly, the playback time t of the continuous historical position data of the flight isstart—tendDividing the time length T into a plurality of playback time periods at equal intervals, wherein: t is tstartFor the playback start time, tendFor playback deadline, PiFor the current playback period, Pi+1Is the next playback period; then creating a playback cache and a download cache, wherein the playback cache is used for storing flight historical position data in the current playback time period, and the download cache is used for storing flight historical position data in the next time period to be played back;
step two, downloading the data in the first time period to a playback buffer S202 stage: during playback, firstly, the data processing module (2) downloads the flight historical position data in a first playback time period from the database (1) to a playback cache;
step three, starting playback data and downloading data in the next playback time period to a downloading cache S203: the data processing module (2) acquires flight historical position data from the playback cache, sends the flight historical position data to the playback display terminal (4) according to a preset playback speed, then the playback display terminal (4) plays back the flight historical position data, and then deletes the played back flight historical position data from the playback cache; meanwhile, the historical flight position data downloading in the next playback time period is executed in parallel, and the historical flight position data obtained by downloading is stored in a downloading cache;
step four, judging whether the playback of the cache data is finished at the S204 stage: judging whether the data in the playback cache is played back completely, and if the judgment result is yes, entering the next step S205; otherwise, repeating the step;
step five, judging whether the data downloading in the next playback time period is finished or not at S205 stage: judging whether the downloading of the flight historical position data in the next playback time period is finished, and if the judgment result is yes, entering the next step S206; otherwise, repeating the step;
step six, storing the data of the download cache into a playback cache, and clearing the download cache in S206: storing the flight historical position data, which is downloaded in the download cache and is to be played back next, in the next playback time period into the playback cache, and meanwhile emptying the flight historical position data in the download cache to prepare for downloading the flight historical position data in the subsequent playback time period;
step seven, judging whether all flight historical position data are played back completely at S207 stage:
judging whether the flight historical position data in the playback cache is empty or not, if so, indicating that no flight historical position data exists in the playback cache and the download cache, and ending the playback; otherwise, the next step returns to the step S203.
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| CN108614853A (en) * | 2018-03-15 | 2018-10-02 | 中国人民解放军63895部队 | A kind of multi-data source synchronizing information mixing storage and playback system and method |
| CN109343368A (en) * | 2018-09-21 | 2019-02-15 | 南京国电南自维美德自动化有限公司 | Real-time control system panoramic view data with buffering recurs system and method online |
| CN109523836A (en) * | 2018-10-29 | 2019-03-26 | 中国航空无线电电子研究所 | A kind of unmanned plane aviation management access General Platform |
| CN109710707A (en) * | 2018-12-06 | 2019-05-03 | 北斗天地股份有限公司 | A kind of method and device of big data trace playback |
| CN110009545B (en) * | 2019-03-19 | 2023-01-24 | 中国民航大学 | Flight position information parallelization fusion method based on multiple data sources |
| CN110673807B (en) * | 2019-08-20 | 2021-07-20 | 华为技术有限公司 | Data display method, terminal and data display system |
| CN110751858B (en) * | 2019-10-16 | 2021-09-07 | 中国民航大学 | Multi-element operation information correlation method suitable for abnormal status information of continuous flight |
| CN112463766B (en) * | 2020-12-08 | 2022-09-27 | 卡斯柯信号有限公司 | Train information recording, reading and playback method based on high-speed read-write database |
| CN114842679B (en) * | 2022-04-20 | 2023-03-03 | 中国民用航空总局第二研究所 | Recording and playback method and system for airport scene track data |
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