CN117640682A - Display control system-based data processing method and system - Google Patents
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Abstract
The invention relates to the technical field of display control systems, and discloses a data processing method and system based on a display control system, wherein the method comprises the following steps: s1, avionics data information registration: the data forwarding unit registers available avionics data information with the data server; s2, checking registration information: after receiving the registration message of the data forwarding unit, the data server checks the registration message which is completed by itself and returns whether the registration is successful to the data forwarding unit; s3, parameter transmission: after the message registration is completed, the data forwarding unit sends the parameters for display control to the data server for caching. The invention solves the problems of non-decoupling of the bottom data business logic and the upper human-computer interface driving data and the like in the prior art.
Description
Technical Field
The invention relates to the technical field of display control systems, in particular to a data processing method and system based on a display control system.
Background
The civil aircraft display and control system replaces the traditional mechanical flight instrument, displays information such as instruments related to flight, communication navigation monitoring and the like in a graphical mode, and helps a pilot to quickly master the flight dynamics of an aircraft. The design method of the data server based on the civil aircraft display control system is designed for meeting the requirement of mutual decoupling of the bottom data service logic and the upper human-computer interface display of the project of the civil aircraft display control system of the company.
The conventional display control system adopts a star-shaped architecture of display control equipment and avionics (data source) equipment, as shown in fig. 1.
The traditional display control system architecture has the advantages of being visual and simple, conforming to objective physical connection reality, each avionics device only needs to report own avionics display data to the display control device, and has the defects that the display control device is required to be responsible for comprehensive processing of data, data management and graphic display of the data, heavy load of working service, strong correlation with a physical interface of avionics device transmission and the representation type of each display data, and large repeated development workload and low software and hardware reusability if the display control device service, display content or accessed avionics device changes.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a data processing method and system based on a display control system, and solves the problems of uncoupling of bottom data business logic and upper human-computer interface driving data and the like in the prior art.
The invention solves the problems by adopting the following technical scheme:
a data processing method based on a display control system comprises the following steps:
s1, avionics data information registration: the data forwarding unit registers available avionics data information with the data server;
s2, checking registration information: after receiving the registration message of the data forwarding unit, the data server checks the registration message which is completed by itself and returns whether the registration is successful to the data forwarding unit;
s3, parameter transmission: after the message registration is completed, the data forwarding unit sends the parameters for display control to the data server for caching.
As a preferred technical solution, in step S1, the registration information sent by the data forwarding unit to the data server includes one or more of the following: parameter ID, storage type mark, storage length, data buffer form mark, data update maximum period.
As a preferred technical scheme, the method further comprises the following steps:
s4, the data server establishes a registration information index table during initialization, and fills the registration information index table after receiving registration information.
In step S4, the data server also creates a memory table for each type of data during initialization.
As a preferred technical scheme, the method further comprises the following steps:
and S5, after the data server receives the data reported by the data forwarding unit, the data server stores the data according to the current parameter ID index information in the registration information index table.
As a preferred technical solution, in S5, the data server also checks periodically whether the data in the table is updated within a specified time, and if not, sets the updatiflag field to 0 in the registration information index table.
As a preferred technical scheme, the method further comprises the following steps:
s6, the display equipment initiates a message subscription command to the data server based on the requirement of the current display data;
s7, after receiving the subscription command, the data server returns a subscription response; meanwhile, the data server reports data to the display equipment according to the parameter reporting period;
s8, the display device sends an avionics data request to the data server, and the data server reports specified request data to the display device after receiving the avionics data request of the display device.
As a preferred technical solution, in step S6, the message subscription includes the following fields: parameter ID, parameter reporting period.
As a preferred technical solution, in step S7, the reported fields include: parameter ID, storage length, data value.
A data processing system based on a display control system is used for realizing the data processing method based on the display control system, and comprises a data forwarding unit, a data server and display equipment which are sequentially in communication connection.
Compared with the prior art, the invention has the following beneficial effects:
the invention avoids the increase of the development work of the data server software caused by the change of the bottom data type and the change of the upper data acquisition mode (periodic acquisition and event request), and has good compatibility with the change of the input data of the external avionics equipment and the display requirement of the MFD equipment.
Drawings
FIG. 1 is a block diagram of a prior art display control system;
FIG. 2 is a block diagram of a display control system-based data processing system according to the present invention;
FIG. 3 is a flow chart of data registration;
FIG. 4 is a flow chart of data management;
FIG. 5 is a flow chart of data subscription and periodic reporting;
FIG. 6 is a flow chart of data request and configuration command data interaction.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
Example 1
As shown in fig. 1 to 6, the design method of the data server based on the civil aircraft display and control system is designed to meet the requirement of mutual decoupling of the underlying data service logic and the upper human-computer interface display of the project of the civil aircraft display and control system. The civil aircraft display and control system replaces the traditional mechanical flight instrument, displays the data such as flight related instruments, communication navigation monitoring and the like in a graphical form, and helps a pilot to quickly master the flight state of an aircraft.
Because the bottom data processing logic of the civil aircraft on-board display control system is different due to service requirements, and the display logic, display form and display content of the upper human-computer interaction interface can be changed and iterated according to the requirements of users, the upper human-computer display interface and the bottom application logic are required to be mutually shielded from the change of each other. In order to meet the above requirements, a general civil aircraft onboard display control system architecture and a general data server based on the architecture are required to be designed, and the following technology is realized:
1. system architecture based on civil aircraft display and control system:
the system architecture based on the civil aircraft display and control system is shown in fig. 2.
The data server functions as:
a) Collecting information of lower-layer avionics parameters;
b) A data management function of avionic parameters;
c) Providing a data source of graphic display elements to an upper multi-function display device (MFD);
therefore, in order to adapt to the change of the type of the reported data of the bottom layer avionics parameters and the change of the request logic of the upper layer data stream, a universal data server is designed, and the requirements of collecting the expandable avionics parameters and the customizable display parameters can be met. The following is a technical method for realizing the general server:
2. registration mechanism based on service data:
and a data server in the display control system provides an avionics data registration interface for each data forwarding unit. After the data forwarding unit is started, the available avionics data information is registered with the data server, and the content included in the registration information sent by the data forwarding unit to the data server is shown in table 1.
Table 1 data registration information definition table
Parameter ID: the unique mark of the avionics parameter has global uniqueness. The avionics parameter in the example is marked as the attitude information 'magnetic heading' of the civil aircraft;
storage type marks: representing common software defined data types, as shown in table 2.
Table 2 store type indication definition table
| Storage type designation | Storage type | Type length (bytes) |
| 1 | Char | 1 |
| 2 | Short | 2 |
| 3 | Unsigned short | 2 |
| 4 | Int | 4 |
| 5 | Unsigned int | 4 |
| 6 | Long | 8 |
| 7 | Unsigned long | 8 |
| 8 | Float | 4 |
| 9 | Double | 8 |
| … | … | … |
In an example, the "magnetic heading" is represented and resolved by floating point (float).
Storage length: marking the length occupied by the parameter based on the storage type, namely the data server supports the caching of the array type data; in the example, the storage length of the magnetic heading is 1, and the marked data forwarding unit only sends 1 floating point type magnetic heading data at a time (single period);
the data cache form designation is as defined in table 3.
Table 3 data cache form indication definition table
The indication indicates a cache form of data in the data server, and in the example, the data cache form of "magnetic heading" is 2, which means that the data server not only caches the magnetic heading data currently reported, but also caches the magnetic heading data reported last time.
Maximum period of data update: 0 indicates no update check; a non-0 indicates an update check time. The survival time of the data in the server is marked, and if the time is exceeded and no update occurs, the data server considers the data as historical data. In the example, the maximum data update period of the magnetic HEADING is 100ms, in fact, the AHRS device reports magnetic HEADING (mag_heading) data in a period of 50ms through the data forwarding unit, and if the data server finds that mag_heading data is not updated within 100ms, it can be judged that communication failure occurs between the AHRS device or the data forwarding unit and the data server, and the data server cannot receive the data reported in the period on time.
In the system power-on initialization stage, the registration flow of the data server and the data forwarding unit is shown in fig. 3.
When the system is powered on, the data server checks the completed registration information after receiving the registration information of the data forwarding unit, checks whether the registration is repeated, the registration type is wrong and the like, and returns whether the registration is successful to the data forwarding unit.
After the message registration is completed, the data forwarding unit periodically/event-based transmission of the parameters for display control to the data server for caching. The data transmission form of each device is shown in table 4.
Table 4 data transmission form table of each device
| Parameter ID | Storage length | Parameter value |
| For example: MAG_HEADING | 1 | --- |
The parameter ID and the storage length are marked as above; the parameter value is the data value reported by the parameter ID in real time.
3. Data management mechanism based on registration information index table:
the data server should build a registration information index table at the time of initialization, and after receiving registration information, the data server fills the content of the registration information index table as shown in table 5.
Table 5 registration information index table
Meanwhile, the data server also establishes a memory table of each type of data during initialization, taking the Float type as an example, and the Float memory table is shown in table 6.
Table 6Float memory table
n is a data server configuration parameter.
The memory table of Char/Short/compact/int/compact int/Long/compact Long/flow/Double is also of similar form.
After receiving the data reported by the data forwarding unit, the data server stores the data according to the current parameter ID index information in the registration information index table; for example: when MAG_HEADING data is received, because the MAG_HEADING type is a float type, the data is put into a float memory table, the address is stored as an indexed 1 address, and meanwhile, the data of the original 1 address is transferred to a 2 address, so that the function of simultaneously caching the current MAG_HEADING data and the last MAG_HEADING data is realized; meanwhile, the data server should also check whether the data in the table is updated in a specified time, if not, the updateFlag field in the registration information index table needs to be set to 0.
Therefore, various types of avionics data reported by the data forwarding unit can be cached in the data server according to the registration information.
4. Data subscription mechanism based on display control application:
the message subscription is a message subscription interface initiated to the data server by the MFD device based on the requirement of the current display data, the subscription message can be initiated to the data server when power is on, and the subscription data can be changed in the normal operation process, and the message subscription comprises the following fields:
a) A parameter ID;
b) Reporting the parameters;
after receiving the subscription command, the data server returns a subscription response; meanwhile, the data server starts reporting the data period to the MFD according to the parameter reporting period, and the reported fields comprise:
a) Parameter ID
b) Storage length
c) Data value
The data server supports the MFD to request data in real time, and the data server reports specified request data to the MFD after receiving an avionics data request of the MFD;
the data request message of the MFD device contains the following fields:
d) Parameter ID
e) Storage of
f) Data value (the value is 0 or NULL when the MFD device initiates a data request)
The data response command of the data server contains the following fields:
a) Parameter ID
b) Storage length
c) Data value (data value of data server fill response according to data request of MFD device)
The data server can also forward control commands such as configuration/setting of the MFD device to each avionics device to complete control of the avionics device. Control commands such as configuration/setup of the MFD device include the following fields:
a) Data type
b) Data length
c) Data value (configuration command value of MFD device)
After receiving the configuration command, the data server transmits the configuration command to each device through the interaction buses (RS 232 bus, RS422 bus and ARINC429 bus) of the data forwarding unit and avionics devices such as AHRS device, ADC device and NAV device according to the communication protocol agreed by each bus.
The invention has the following advantages:
the design method avoids the increase of the development work of the data server software caused by the change of the bottom data type and the change of the upper data acquisition mode (periodic acquisition and event request) based on the civil aircraft display control system architecture, and has good compatibility with the change of the input data of external avionics equipment and the display requirement of the MFD equipment.
The key points of the invention are as follows:
a) The system architecture: the system comprises an MFD device, a data server, a data forwarding unit and physical connection and logical connection relations of entities of each civil aircraft avionics device;
b) Based on the underlying business data registration mechanism: the method comprises a registration command and a corresponding flow;
c) Data management mechanism based on data type: the memory management form comprises a registration information index table and various avionics parameters.
d) Data subscription mechanism based on display control application: including subscription commands for data, data request/response commands.
As described above, the present invention can be preferably implemented.
All of the features disclosed in all of the embodiments of this specification, or all of the steps in any method or process disclosed implicitly, except for the mutually exclusive features and/or steps, may be combined and/or expanded and substituted in any way.
The foregoing description of the preferred embodiment of the invention is not intended to limit the invention in any way, but rather to cover all modifications, equivalents, improvements and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. The data processing method based on the display control system is characterized by comprising the following steps of:
s1, avionics data information registration: the data forwarding unit registers available avionics data information with the data server;
s2, checking registration information: after receiving the registration message of the data forwarding unit, the data server checks the registration message which is completed by itself and returns whether the registration is successful to the data forwarding unit;
s3, parameter transmission: after the message registration is completed, the data forwarding unit sends the parameters for display control to the data server for caching.
2. The display control system-based data processing method according to claim 1, wherein in step S1, the registration information sent by the data forwarding unit to the data server includes one or more of the following: parameter ID, storage type mark, storage length, data buffer form mark, data update maximum period.
3. A display control system-based data processing method according to claim 1 or 2, further comprising the steps of:
s4, the data server establishes a registration information index table during initialization, and fills the registration information index table after receiving registration information.
4. A method for processing data based on a display control system according to claim 3, wherein in step S4, the data server further establishes a memory table of each type of data during initialization.
5. A display control system-based data processing method according to claim 3, further comprising the steps of:
and S5, after the data server receives the data reported by the data forwarding unit, the data server stores the data according to the current parameter ID index information in the registration information index table.
6. The method of claim 5, wherein in S5, the data server further checks whether the data in the table is updated within a predetermined time, and if not, the updateFlag field is set to 0 in the registration information index table.
7. The display control system-based data processing method according to claim 5, further comprising the steps of:
s6, the display equipment initiates a message subscription command to the data server based on the requirement of the current display data;
s7, after receiving the subscription command, the data server returns a subscription response; meanwhile, the data server reports data to the display equipment according to the parameter reporting period;
s8, the display device sends an avionics data request to the data server, and the data server reports specified request data to the display device after receiving the avionics data request of the display device.
8. The method for processing data based on a display control system according to claim 7, wherein in step S6, the message subscription includes the following fields: parameter ID, parameter reporting period.
9. The method for processing data based on a display control system according to claim 8, wherein in step S7, the reported fields include: parameter ID, storage length, data value.
10. A display control system-based data processing system, which is characterized by being used for realizing the display control system-based data processing method according to any one of claims 1 to 9, and comprising a data forwarding unit, a data server and a display device which are sequentially in communication connection.
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