CN111768653B - ADS-B test data simulation method - Google Patents

Abstract

The invention discloses a method for simulating ADS-B test data, which comprises the following steps: drawing data to perform target simulation; calculating flight plan state and target position and speed information according to the flight plan and the simulation time, and sending a flight dynamic telegraph; calculating the high-precision time of receiving the same target ADS-B signal by different ground stations; and performing ADS-B ground station and radar simulation to generate the associated radar track and ADS-B track. The invention can improve the automation degree of the test and the coverage rate of the test case to the standard.

Description

A Method of ADS-B Test Data Simulation

technical field

The invention relates to ADS-B technology, in particular to a method for ADS-B test data simulation.

Background technique

With the development of ADS-B technology and the construction of ADS-B system nationwide by civil aviation, higher requirements are put forward for the test of ADS-B system. ADS-B system is a brand-new surveillance system, which is different from radar in terms of working principle, working method, operation process and convenience of data characteristics. So the original radar data simulator can not meet the ADS-B system function and performance test requirements.

The traditional test method simulates ADS-B track and radar track through different simulators, each simulator works independently, and multiple simulators need to be set for each test process, and it is impossible to generate ADS-B, radar and flight tracks. The target track associated with the plan cannot simulate high-precision time-scale information. As a result, test cases have low standard coverage and low test automation.

SUMMARY OF THE INVENTION

Aiming at the problems existing in the prior art, the present invention provides a method for ADS-B test data simulation which can improve the automation degree of the test and the coverage ratio of the test case to the standard.

The object of the present invention is achieved through the following technical solutions.

A method for ADS-B test data simulation, the steps comprising:

Target simulation based on flight plan data;

According to the flight plan and simulation time, calculate the flight plan status, target position and speed information, and send flight dynamic telegrams;

Calculate the high-precision time when different ground stations receive the same target ADS-B signal;

Run ADS-B ground station and radar simulations to generate associated radar tracks and ADS-B tracks.

The target simulation is performed based on the flight plan, and specifically includes:

According to the simulation time, combined with the target flight plan information, the status judgment of the target takeoff, landing, etc. is carried out, and the current position, altitude, speed and heading of the target are calculated according to the waypoint, passing time, and passing speed information in the flight plan; according to the target Status changes send flight dynamic telegrams.

Update flight plan status based on time, including:

Determine whether the current simulation time is greater than the take-off time set in the target flight plan: when the simulation time is less than or equal to the take-off time, the status is set to "waiting"; the current simulation time is greater than or equal to the landing time, and the flight plan status is set to "landing" status; The current time is between takeoff time and landing time, update the status of the flight plan to "take off".

Send corresponding flight telegrams according to changes in flight status, including:

Determine the current status of the flight plan and the status of the previous cycle, and use the preset template to send flight dynamic telegrams according to the status changes. The specific method is: the status changes from "waiting" to "takeoff", and a "takeoff report" is sent; the status changes from "takeoff" to "landing", and a "landing report" is sent.

The calculation of the high-precision time when different ground stations receive the same target ADS-B signal specifically includes:

Calculate the distance between the target and each ground station, calculate the time when the signal arrives at the ground station, and perform time difference positioning through the high-precision time difference arriving at different ground stations.

Calculate the current motion state of the target according to the route string information in the flight plan, including:

When the target state is "takeoff", according to the current time and the waypoints, passing time, and passing speed in the planned route string, the current position, altitude and speed information of the target are calculated, and the target simulation data is generated; the target data includes: Target's position, speed, secondary code, flight number, 24-digit aircraft address code and SPI.

Simultaneously simulates interrelated ADS-B tracks and radar tracks, including:

For each target, ADS-B ground station simulation and radar simulation are simultaneously performed to generate ADS-B track and radar track, and the generated ADS-B track, radar track and flight plan can be correlated with each other.

Can simulate ADS-B ground station status information, including:

While simulating the ADS-B track, according to the working status of the ground station, simulate the status data, including: identification number, time, ground station status, service configuration and service status.

Compared with the prior art, the present invention has the advantages that: the present invention judges the flight state of the target and generates simulated target data according to the flight plan, and uses the ADS-B ground station simulation model and the radar simulation model to generate the ADS-B ground station track and the simulation model. Secondary radar track. The generated radar track can be correlated with the ADS-B track and flight plan for verification of the ADS-B track. Using the ADS-B ground station and radar data simulation method based on the flight plan, the ADS-B track and radar track related to the plan can be generated, and the data can be used for the test of the ADS-B system, which can improve the coverage of test cases, Improve test automation, simplify manual operations in the test process, and improve test efficiency.

Description of drawings

Fig. 1 is the flow chart of the present invention;

Fig. 2 is a flow chart of generating target data according to flight plan information;

Fig. 3 is the flow chart of judging and updating the flight plan state;

Fig. 4 is the ADS-B data simulation flow chart;

Figure 5 is a flow chart of radar data simulation;

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

A method for ADS-B test data simulation, which can be implemented by a terminal. The terminal may be a server, a desktop computer, a notebook computer, etc., and system programs and application programs are installed in the terminal. In the process of using the terminal, the user can use the method provided by the embodiment of the present invention to simulate the ADS-B data. The simulated data can be sent to the ADS-B system for system testing.

As shown in Figure 1, the processing flow may include the following steps:

Step 1: Obtain ground station and radar configuration information.

While the application is running, obtain the configuration information of the ADS-B ground station and radar. The configuration information of the ADS-B ground station mainly includes: the name of the ground station, SAC, SIC, the position of the ground station, coverage, data period, output data format, data output port, etc. The configuration information of the radar mainly includes: radar station number, position, detection range, system error, random error, period, output data format, and output address port. The ground station and radar configuration information is used for subsequent sensor data simulations.

Step 2: Get flight plan information.

In the process of running the application, read the flight plan information of the pre-entered simulation target. The content of the flight plan mainly includes: flight number, 24-digit address code, secondary code, take-off time, landing time, take-off airport, landing Airport and Airline Strings. The route string includes: waypoint name, position, passing speed and altitude, etc.

Step 3: Generate target data according to the flight plan information.

In the process of running the application, according to the simulation time, combined with the target flight plan information, the target take-off, landing and other status judgments are made, and the current position of the target is calculated according to the waypoint, passing time, passing speed and other information in the flight plan. , altitude, speed and heading. Send flight dynamic telegrams (takeoff report, landing report, etc.) according to the change of target state. Generate target simulation data for sensor simulation. The process is shown in Figure 2.

Step 3.1: Get Simulation Time

Calculate the current simulation time based on the simulation start time and simulation step size.

Step 3.2: Determine and update flight plan status

According to the current simulation time and the takeoff and landing time in the flight plan. Determine the current status of the target and update the flight plan status. The steps are shown in Figure 2.

Step 3.2.1: Determine whether the time is greater than the take-off time

Determine whether the current simulation time is greater than the takeoff time set in the target flight plan. If "Yes" go to step 323, if "No" go to step 322.

Step 3.2.2: Status is set to "Waiting"

Update the status of the flight plan to "waiting".

Step 3.2.3: Determine whether the time is greater than the landing time

Determine whether the current simulation time is greater than the landing time set in the target flight plan. If "yes" go to step 325, if "no" go to step 324.

Step 3.2.4: Status is set to "Take Off"

The current time is between takeoff and landing, update the status of the flight plan to "take off".

Step 3.2.5: The status is set to "landing"

The current time is greater than the landing time, and the flight plan status is set to the "landing" status.

Step 3.3: Send flight telegrams based on state changes

Determine the current status of the flight plan and the status of the previous cycle, and use the preset template to send flight dynamic telegrams according to the status changes. The specific method is: the status changes from "waiting" to "takeoff", and the "takeoff report" is sent; the status changes from "takeoff" to "landing", and the "landing report" is sent

Step 3.4: Generate Target Simulation Data

When the target state is "takeoff", according to the current time and planned route string information, the current position, altitude, speed and other information of the target are calculated to generate target simulation data. The target data includes: the target's position, speed, secondary code, flight number (call sign), 24-bit aircraft address code and SPI and so on.

Step 4; ADS-B data simulation

According to the configuration information of the ADS-B ground station, receive the target simulation data generated in step 3, and generate ADS-B track data and ADS-B status data through the ground station simulation. The specific steps are shown in Figure 4.

Step 4.1: Get Ground Station Configuration and Status Information

Get the configuration information of the ground station. Mainly include: ground station name, SAC, SIC, ground station location, coverage, data cycle, output data format, data output port, switch status, etc. If the ADS-B status is normal, the simulation is performed.

Step 4.2: Determine whether the target is within the detection range

According to the position of the ADS-B ground station, the detection range and the target position, determine whether the target is within the detection range of the ADS-B ground station. If it is not within the range, exit

Step 4.3: Calculate High Precision Time Data

According to the time of the target simulation, the distance between the target and the ADS-B ground station, the electromagnetic wave transmission time is calculated by dividing the distance by the electromagnetic wave transmission rate, and the high-precision time when the ground station receives the signal is calculated.

Step 4.4: Generate ADS-B track data and status data.

According to the target simulation data and the ground station simulation model, the ADS-B track and status data are generated. Track content includes: data source identification, position information receiving time, target report description, target address, quality factor, position information based on WGS-84 coordinates, aircraft operating status, transmitter type, geometric altitude, flight level, pressure vertical Velocity (Climb Descent Rate), Geographic Vertical Rate (Climb Descent Rate), Ground Motion Vector (Ground Speed), Target Identification, Target Status, and High Accuracy Time of Target Report received. Status data includes: identification number, time, ground station status, service configuration, and service status.

Step 4.5: Send data by specified port

The track data is sent according to the sending method, sending address and port configured by the ground station. ADS-B track output format adopts ASTERIX CAT021, and status information adopts ASTRIX CAT023 format.

Step 5: Radar Data Simulation

According to the configuration information of the radar, the target simulation data generated in step 3 is received, and the radar track data is generated by simulation. The radar track generated by the simulation adopts the format of MH4008 and ASTERIX CAT048. The specific steps are shown in Figure 5.

Step 5.1: Get the current sector of the radar

According to the number of sectors in the radar configuration, the scanning period and the simulation time, the current scanning sectors of the radar are calculated.

Step 5.2: Determine if the target is within the sector

Interpolate or extrapolate the target simulation data to the current simulation time, and calculate whether the target is within the sector range according to the current radar sector and radar detection range. If it is within the range, execute 5.3, otherwise exit.

Step 5.3 Generate radar track data

According to the current target simulation data, the radar track of the target is generated and updated, the system error and detection error are added, and the track filter is performed. The track content includes: station number, batch number, secondary code, latitude and longitude, altitude, speed and other information.

Step 5.4 Send data by specified port

According to the configured sending method and sending port, the simulated radar data is sent to the specified address and port.

Claims (8)

1. a method for ADS-B test data simulation, is characterized in that step comprises: Target simulation based on flight plan data; According to the flight plan and simulation time, calculate the flight plan status, target position and speed information, and send flight dynamic telegrams; Calculate the high-precision time when different ground stations receive the same target ADS-B signal; Perform ADS-B ground station and radar simulations to generate associated radar tracks and ADS-B tracks; Wherein, generating the associated ADS-B track includes the following steps: acquiring ground station configuration and status information, and performing simulation if the ADS-B status is normal; Judging whether the target is within the detection range: According to the position of the ADS-B ground station, the detection range and the target position determine whether the target is within the detection range of the ADS-B ground station, if not, exit; Calculate high-precision time data: According to the target simulation time, the distance between the target and the ADS-B ground station, divide the distance by the electromagnetic wave transmission rate, calculate the electromagnetic wave transmission time, and calculate the high-precision time when the ground station receives the signal; Generate ADS-B track data and status data: Generate ADS-B track and status data according to target simulation data and ground station simulation model; Send data according to the designated port: Send track data according to the sending method, sending address and port configured by the ground station; Generating the associated ADS-B track consists of the following steps: Obtain the current sector of the radar: Calculate the current scanning sector of the radar according to the number of sectors in the radar configuration, the scanning period and the simulation time; Determine whether the target is within the sector range: Interpolate or extrapolate the target simulation data to the current simulation time, calculate whether the target is within the sector range according to the current radar sector and radar detection range, and exit if it is not within the range; Generate radar track data: According to the current target simulation data, generate and update the target's radar track, add system errors and detection errors, and perform track filtering; Send data by designated port: Send simulated radar data to the designated address and port according to the configured sending method and sending port. 2. the method for a kind of ADS-B test data simulation according to claim 1, is characterized in that described target simulation is carried out based on flight plan, specifically comprises: According to the simulation time, combined with the target flight plan information, the target takeoff and landing status are judged, and the current position, altitude, speed and heading of the target are calculated according to the waypoint, passing time and passing speed information in the flight plan; according to the target status changes to send flight dynamic telegrams. 3. the method for a kind of ADS-B test data simulation according to claim 1, is characterized in that, according to time update flight plan state, specifically comprises: Determine whether the current simulation time is greater than the take-off time set in the target flight plan: when the simulation time is less than or equal to the take-off time, the status is set to "waiting"; the current simulation time is greater than or equal to the landing time, and the flight plan status is set to "landing" status; The current time is between takeoff time and landing time, update the status of the flight plan to "take off". 4. the method for a kind of ADS-B test data simulation according to claim 1, it is characterized in that sending corresponding flight telegram according to the change of flight state, specifically comprises: Determine the current status of the flight plan and the status of the previous cycle, and use the preset template to send flight dynamic telegrams according to the status changes. The specific method is: the status changes from "waiting" to "takeoff", and a "takeoff report" is sent; when the status changes from "takeoff" to "landing", a "landing report" is sent. 5. the method for a kind of ADS-B test data simulation according to claim 1, it is characterized in that described calculating different ground station receives the high precision time of same target ADS-B signal, specifically comprises: Calculate the distance between the target and each ground station, calculate the time when the signal arrives at the ground station, and perform time difference positioning through the high-precision time difference arriving at different ground stations. 6. the method for a kind of ADS-B test data simulation according to claim 1 is characterized in that according to the route string information in the flight plan, calculates the current motion state of the target, specifically comprises: When the target state is "takeoff", according to the current time and the waypoints, passing time, and passing speed in the planned route string, the current position, altitude and speed information of the target are calculated, and the target simulation data is generated; the target data includes: Target's position, speed, secondary code, flight number, 24-digit aircraft address code and SPI. 7. the method for a kind of ADS-B test data simulation according to claim 1, is characterized in that, simulates the ADS-B track and radar track that are correlated with each other simultaneously, specifically comprises: For each target, ADS-B ground station simulation and radar simulation are simultaneously performed to generate ADS-B track and radar track, and the generated ADS-B track, radar track and flight plan can be correlated with each other. 8. the method for a kind of ADS-B test data simulation according to claim 1, is characterized in that, can simulate ADS-B ground station state information, specifically comprises: While simulating the ADS-B track, according to the working status of the ground station, simulate the status data, including: identification number, time, ground station status, service configuration and service status.

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