CN112904831B - System for testing delay characteristics of display control system - Google Patents

Abstract

The invention discloses a system for testing the delay characteristics of a display and control system, and relates to the technical field of a test verification platform. The system comprises a master control module, a time synchronization module, an image acquisition module, a bus data acquisition module, a data storage module, and a delay characteristic analysis module. The invention has the following beneficial effects: the invention uses the above modules in coordination, utilizes a set of test system software and hardware environment to implement testing and analysis of performance indicators such as network delay, response delay, and bandwidth utilization rate of the display and control system, and analyzes the test results to evaluate whether a set of test verification platforms are met for system design requirements and performance requirements. The application of the test verification platform provides a complete set of software and hardware solutions for integrated verification testing of the display and control system, solves the problem of testability of the delay characteristics of the display and control system, and greatly improves the system comprehensive verification progress and the correctness and completeness of performance testing.

Description

A system for testing the delay characteristics of display and control systems

Technical Field

The invention relates to the technical field of test verification platforms, and in particular to a system for testing the delay characteristics of a display and control system.

Background technique

The display and control system is an important part of the aircraft avionics system. It is responsible for receiving the interactive data of all other systems on the aircraft and presenting it directly to the crew through the display device to ensure that the crew can obtain the data and status of each system on the aircraft in real time. At the same time, the display and control system provides a control panel as an input device for the crew to switch the display screen, input data and other operations. Functional testing is mainly based on product business requirements and product industry characteristics to conduct product testing to ensure whether they meet user needs. Performance testing is a process of applying pressure to the system under test in a certain way according to a certain test strategy to obtain various performance indicators such as the system's response time, operating efficiency and resource utilization to evaluate whether the system meets user performance requirements. The display and control system has many configuration items, complex functional cross-linking tests, and tight time and heavy tasks for system integration and verification. An effective integrated verification environment must be available to timely discover problems, accurately locate causes, and quickly find reasonable solutions. However, in the current integration and verification process of the display and control system, there is no available verification test environment for performance testing, which makes it difficult to carry out the integration and verification of the performance of the display and control system, affecting the progress of system comprehensive verification and the correctness and completeness of performance testing. The system under test of the display and control system time characteristic test and verification platform is the real display and control system. The system composition is complex, the functional requirements are very high, and the entire development process must meet international airworthiness requirements. In order to ensure that the safety of the product meets the requirements and the technical performance indicators meet the requirements, the system needs to test and verify the performance characteristics of the system. Therefore, during the entire system development process, it is necessary not only to focus on achieving the functions expected by customers, but more importantly to ensure the safety, reliability and stability of the functions. Based on the requirements of the system development process and the limitations of the existing test environment, it has become increasingly important and urgent to build a comprehensive display and control system time characteristic test and verification environment. Therefore, the present invention is required to design a system for display and control system delay characteristic testing to solve the above-mentioned problems.

Summary of the invention

The purpose of the present invention is to provide a system for testing the delay characteristics of a display and control system to solve the problems raised in the above background technology.

To achieve the above object, the present invention provides the following technical solutions: A system for delay characteristic testing of a display and control system, comprising the following contents: a master control module, a time synchronization module, an image acquisition module, a bus data acquisition module, a data storage module, and a delay characteristic analysis module;

The master control module is used to coordinate and control other modules in the system;

The time synchronization module is used to provide time synchronization information for other modules in the system;

The image acquisition module is used to capture the display screen of the display control system under test, and send the captured screen to the data storage module;

The bus data acquisition module is used to collect bus data of each monitoring point of the measured display and control system, and send the collected data to the data storage module; the bus data acquisition module is connected to the measured display and control system in a non-invasive manner;

The data storage module is used to receive and store various types of data collected by the data acquisition module and the bus data acquisition module, and provide them to the delay characteristic analysis module for subsequent analysis and processing;

The delay characteristic analysis module is used to analyze and process the image data and bus data stored in the data storage module, and output the delay characteristic test result of the display and control system under test.

Preferably, the master control module, time synchronization module, image acquisition module, bus data acquisition module, data storage module, and delay characteristic analysis module are deployed in a distributed manner and run on several computers according to load and function categories;

Preferably, the time synchronization module adopts the IRIG-B protocol as the time synchronization standard, which includes a GPS antenna, a timing card, an IRIG-B code distributor, and provides microsecond-level time synchronization accuracy;

Preferably, the image acquisition module system includes a lens, a high-speed camera, a disk array and an image processor, and can achieve a shooting speed of 1000 frames per second.

Preferably, the bus data acquisition module supports access to discrete quantity boards, ARINC825 boards, ARINC429 boards, ARINC664 boards and other types of boards, and the accessed boards all support hardware timestamp marking function.

Preferably, the data storage module supports large-scale image storage and bus data storage functions.

Preferably, the delay characteristic analysis module applies image analysis technology and data frame recognition technology, which can accurately track and identify the characteristic values of each monitoring point of the measured display and control system, and then analyze and process the delay characteristics of the measured display and control system. The delay characteristic analysis module includes the following steps:

S1. Before the analysis begins, the user marks the feature value on the data frame structure of the first monitoring point and selects an initial time t0;

S2, the delay characteristic analysis module selects a certain amount of data frames and image frames collected from each monitoring point starting from t0 from the data storage module, and arranges them in ascending order according to the collection time;

S3, the delay characteristic analysis module performs feature matching at the first monitoring point according to the characteristic value to find the starting data frame;

S4, the delay characteristic analysis module performs feature matching on all subsequent monitoring points according to the feature values to find the associated data frame;

S5, the delay characteristic analysis module performs feature matching on the captured image frames according to the feature values to find the associated image frames;

S6. The delay characteristic analysis module performs delay characteristic analysis and processing according to the starting data frame, the associated data frame and the associated image frame, and outputs the delay characteristic analysis result.

Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention, through the use of the above process, utilizes a set of test system hardware environment to realize the testing and analysis of the performance indicators such as network delay, response delay, bandwidth utilization rate, etc. of the display and control system, and utilizes high-speed camera equipment and image analysis software to realize the testing and verification of the screen synchronization of the display and control system. By analyzing the test results, a set of verification platforms is formed to evaluate whether the system design requirements and performance requirements are met. The application of this performance verification platform provides a complete set of software and hardware solutions for the integrated verification test of the display and control system, solves the problem of the testability of the display and control system, and greatly improves the progress of the system comprehensive verification as well as the correctness and completeness of the performance test.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a system overall framework diagram of the present invention;

FIG2 is a system deployment block diagram of the present invention;

FIG3 is an original database table structure of the present invention;

Fig. 4 is a data frame database table structure of the present invention;

FIG. 5 is a table structure of an image frame database of the present invention.

Detailed ways

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Please refer to Figures 1-2. The present invention provides a technical solution: a system for delay characteristic testing of a display and control system, comprising the following contents: a master control module, a time synchronization module, an image acquisition module, a bus data acquisition module, a data storage module, and a delay characteristic analysis module;

The master control module is used to coordinate and control other modules in the system;

The time synchronization module is used to provide time synchronization information for other modules in the system;

The image acquisition module is used to capture the display screen of the display control system under test, and send the captured screen to the data storage module;

The bus data acquisition module is used to collect bus data of each monitoring point of the measured display and control system, and send the collected data to the data storage module;

The data storage module is used to receive and store various types of data collected by the data acquisition module and the bus data acquisition module, and provide them to the delay characteristic analysis module for subsequent analysis and processing;

The delay characteristic analysis module is used to analyze and process the image data and bus data stored in the data storage module, and output the delay characteristic test result of the display and control system under test.

Among them, the master control module runs on the PC, the delay characteristic analysis module, data storage module, bus data acquisition module, and image acquisition module run on independent high-performance workstations respectively, and the above modules exchange data through high-speed Ethernet, as shown in Figure 2.

Among them, the time synchronization module completes the time synchronization of the signal acquisition of the entire system, ensures that all data acquisition is completed under one time reference, and adopts the IRIG-B protocol as the time synchronization standard. It includes a GPS antenna, a timing card, and an IRIG-B code distributor, as shown in Figure 2.

The image acquisition module system includes a lens, a high-speed camera, a disk array and an image processor, which mainly realizes image capture and image storage, and provides a data delay characteristic analysis module for image analysis and processing.

Among them, the bus data acquisition module mainly realizes Arinc825 data acquisition monitoring, Arinc664 data acquisition and TAP function, Arinc429 data acquisition, and discrete quantity data acquisition.

The data storage module is used to store the bus data collected by the bus data acquisition module and the image data collected by the image acquisition module, and provides an interface for query and analysis for the delay characteristic analysis module. The data storage module is implemented using a MySQL database, including an original database, a data frame database, and an image frame database. The original database table structure is shown in FIG3 , the data frame database table structure is shown in FIG4 , and the image frame database table structure is shown in FIG5 .

Wherein, the delay characteristic analysis module includes the following steps:

S1. Before the analysis begins, the user marks the feature value on the data frame structure of the first monitoring point and selects an initial time t0;

S2, the delay characteristic analysis module selects a certain amount of data frames and image frames collected from each monitoring point starting from t0 from the data storage module, and arranges them in ascending order according to the collection time;

S3, the delay characteristic analysis module performs feature matching at the first monitoring point according to the characteristic value to find the starting data frame;

S4, the delay characteristic analysis module performs feature matching on all subsequent monitoring points according to the feature values to find the associated data frame;

S5, the delay characteristic analysis module performs feature matching on the captured image frames according to the feature values to find the associated image frames;

S6. The delay characteristic analysis module performs delay characteristic analysis and processing according to the starting data frame, the associated data frame and the associated image frame, and outputs the delay characteristic analysis result.

The delay characteristic analysis module includes a data frame identification method, which is described as follows:

A. After being processed, the collected data frame enters the A664 information processing table, the A825 information processing table, and the A429 information processing table.

B. The processing steps of A664 information processing table are as follows:

a) Based on the preliminary identification of 664 data, first identify whether the data frame is native A664 data or data converted from A429 or A825.

b) If the data frame is A664 native data, it is necessary to identify the same data stream data frame information based on the frame identification quintuple, that is, to identify whether the data frame comes from the same data stream through the UDP source port + IP source address + MAC destination address + UDP destination port + IP destination address in the data frame.

c) Then sort the collected data frames and use SQL statements to find the top 5 frames (determined by the number of collectors). These 5 frames are the same frame of data.

d) If the data frame is converted from A429 to 664 data frame, it is necessary to match the corresponding A429 information frame in the A429 information processing table according to the 664 data content, and fill the corresponding A429 frame number back into the "Packaging Information Number List".

e) If the data frame is A825 data, the same processing as A429 is required.

C. After identifying the same frame A of the bus data, the last step is to identify how the data frame matches the image changes when the image changes.

a) First, determine the area information of the data frame displayed on the interface according to the image data frame mapping relationship table, and find the timestamp when the area changes in multiple images according to the image matching algorithm.

b) Sort the time stamps and find the maximum time Tmax of the same data frame collected on the bus.

c) Compare Tmax with the image change timestamp and find the first video timestamp > Tmax. This image frame is the image information that matches data frame A.

D. Special situation handling

a) ARINC664 frame loss: Based on the identification of the same ARINC664 data frames, the SN numbers of the same data frames need to be compared. Only those with the same SN numbers are the same frame data. If the SN numbers are different, it means that the data frame has been lost during transmission. It is necessary to remove the interfering data with different SN numbers.

b) ARINC429 frame loss: The ARINC429 configuration table configures the A429 message including the label number and how the A429 data word is assembled into a meaningful data message. After the data information is collected on the data acquisition board, the label information is configured according to the configuration table to determine whether the received label number is lost. For example, a message is configured with 3 labels, but only 2 are collected on the acquisition board, which is considered as packet loss.

c) ARINC825 frame loss: The ARINC825 configuration table configures each message with a corresponding message ID and message sending cycle. After the A825 board collects data, it parses the message ID and determines whether the message reception time is one cycle apart from the previous identical message. If the interval is more than one cycle, it indicates that data is lost.

The delay characteristic analysis module includes an image frame difference recognition method, which is described as follows:

A. Definition

[Original frame]: The image frame collected in the static state before stimulation;

【Changed frame】: The picture frame generated during the change of the picture frame caused by the stimulus;

[Result frame]: The static state after the change process of the picture frame caused by the stimulus is completed is the result picture frame;

[Frame interval]: A set of image frames collected by a high-speed camera within a continuous period of time;

[Minimum stimulus interval]: The minimum time interval between two consecutive data stimulus from the source;

[Previous frame]: The previous frame used to compare two identical image frames in the image algorithm;

【Next frame】: The next frame used to compare two image frames in the image algorithm to see if they are the same;

[Frame Interval]: In order to improve the calculation speed and reduce the image recognition algorithm, the set frame interval can be replaced by a number to indicate the number of frames in the interval. The first frame in the frame interval is the previous frame, and the last frame is the next frame.

B. Image Segmentation

Divide the image into 100 small images, calculate the DCT changes of each image, and take the largest change as the overall image change rate and record it.

C. Simplify colors

Convert the image into a grayscale image to simplify the calculation.

D. Calculate DCT (discrete cosine transform)

DCT decomposes the image into frequency clusters and trapezoidal shapes, and calculates the overall difference of the image based on the absolute value of the grayscale difference of each pixel in the previous frame and the next frame (mi-ni) to obtain DCT. The formula is as follows:

T＝∑abs(mi-ni)

E. Calculate the average

Divide the total value of DCT by the image area (S) and calculate the mean value of DCT

F. Filtering the DCT

The DCT mean of all image sequences is recorded and average filtered to filter the jitter of the image itself. The formula is as follows, where xi is the mean DTC of each image and (n-i) is the number of images.

G. Result acquisition

According to the DCT mean curve of the filtered picture sequence, the point when the curve starts to change is the change frame, and the point when the curve stops changing is the result frame.

The present invention cooperates with the above process and builds a set of test system software and hardware environment to realize the testing and analysis of performance indicators such as network delay, response delay, bandwidth utilization rate, etc. of the display and control system, and uses high-speed camera equipment and image analysis software to realize the testing and verification of display and control screen synchronization. By analyzing the test results, a set of verification platform is formed to evaluate whether the system design requirements and performance requirements are met. The application of this performance verification platform provides a complete set of software and hardware solutions for the integrated verification test of the display and control system, solves the testability problem of the display and control system, and greatly improves the progress of the system comprehensive verification as well as the correctness and completeness of the performance test.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims (7)

1. A system for testing the delay characteristics of a display and control system, characterized in that it comprises the following contents: a master control module, a time synchronization module, an image acquisition module, a bus data acquisition module, a data storage module, and a delay characteristics analysis module; The master control module is used to coordinate and control other modules in the system; The time synchronization module is used to provide time synchronization information for other modules in the system; The image acquisition module is used to capture the display screen of the display control system under test, and send the captured screen to the data storage module; The bus data acquisition module is used to collect bus data of each monitoring point of the measured display and control system, and send the collected data to the data storage module; The data storage module is used to receive and store various types of data collected by the data acquisition module and the bus data acquisition module, and provide them to the delay characteristic analysis module for subsequent analysis and processing; The delay characteristic analysis module is used to analyze and process the image data and bus data stored in the data storage module, and output the delay characteristic test result of the tested display and control system. 2. According to claim 1, a system for delay characteristic testing of a display and control system is characterized in that the master control module, image acquisition module, bus data acquisition module, data storage module, and delay characteristic analysis module have a distributed deployment function, and each module can run on different computers according to the characteristics of the system under test. 3. A system for testing the delay characteristics of a display and control system according to claim 1, characterized in that: the time synchronization module adopts the IRIG-B protocol as the time synchronization standard, and it includes a GPS antenna, a timing card, and an IRIG-B code distributor. 4. A system for testing the delay characteristics of a display and control system according to claim 1, characterized in that the image acquisition module system includes a lens, a high-speed camera, a disk array and an image processor. 5. A system for delay characteristic testing of a display and control system according to claim 1, characterized in that: the bus data acquisition module supports access to discrete quantity boards, ARINC825 boards, ARINC429 boards, ARINC664 boards and other types of boards, and the accessed boards must support hardware timestamp marking function. 6. A system for testing the delay characteristics of a display and control system according to claim 1, characterized in that: the data storage module supports large-scale image storage and bus data storage functions. 7. A system for testing the delay characteristics of a display and control system according to claim 1, characterized in that: the delay characteristics analysis module applies image analysis technology and data frame recognition technology, can accurately track and identify the characteristic values of each monitoring point of the display and control system under test, and then analyze and process the delay characteristics of the display and control system under test, and the delay characteristics analysis module includes the following steps: S1. Before the analysis begins, the user marks the feature value on the data frame structure of the first monitoring point and selects an initial time t0; S2, the delay characteristic analysis module selects a certain amount of data frames and image frames collected from each monitoring point starting from t0 from the data storage module, and arranges them in ascending order according to the collection time; S3, the delay characteristic analysis module performs feature matching at the first monitoring point according to the characteristic value to find the starting data frame; S4, the delay characteristic analysis module performs feature matching on all subsequent monitoring points according to the feature values to find the associated data frame; S5, the delay characteristic analysis module performs feature matching on the captured image frames according to the feature values to find the associated image frames; S6. The delay characteristic analysis module performs delay characteristic analysis and processing according to the starting data frame, the associated data frame and the associated image frame, and outputs the delay characteristic analysis result.