JP6719405B2 - Distributed simulation system - Google Patents

Description

The present invention relates to a distributed simulation system in which a plurality of simulators perform simulation while exchanging data via a network.

An example of application of the distributed simulation system is a distributed real-time training simulation system for defense. In this type of simulation system, many simulators are connected by a network. The simulation information of the simulation entity simulated in a certain simulator is transmitted to another simulator via the network, and the battle situation by a large number of simulation entities simulating the teams of the ally and the enemy is simulated. One example of a simulated entity is a tank in a tactical training simulator, and another example is a fighter and a fighter unit in an air combat simulator. Further, examples of the simulated information in the simulated entity include motion information including position and velocity, state information including remaining ammo and damage status, and event information including attack and communication.

In such a distributed real-time training simulation system for defense, in order to improve the reusability and interoperability of the simulator, standard technology has been defined and standardized for the purpose of reducing system development and operation costs. Examples of typical standards are Non-Patent Documents 1 to 3 shown below. Hereinafter, the standards of Non-Patent Documents 1 to 3 will be referred to as “DIS”, “HLA”, and “RPR-FOM” by taking the initials of their names.

DIS is a standard that standardizes protocol data for simulators to exchange data by UDP/IP (User Datagram Protocol/Internet Protocol) multicast communication on a network. HLA is a standard that standardizes the functions and interfaces of middleware RTI (Run-Time Infrastructure) that connects simulators to each other. The middleware RTI is the core software in the HLA-compliant system, and is software that manages data transmission/reception and synchronization processing between simulators. RPR-FOM is a standard used in HLA and is a standard that defines a data standard for exchanging simulation data compatible with DIS between middleware RTI and a simulator.

In a distributed real-time training simulation system for defense, events such as positional relationships and collisions between entities simulated in a distributed manner by a plurality of simulators are shared by the simulators by data flowing on a network. Therefore, when the number of connected simulators increases and the system scale increases, the processing load on the network increases, and it becomes difficult to secure the real-time property of the system. In DIS and RPR-FOM, in order to solve this problem, a DR (Dead-Reckoning) algorithm for dynamically controlling so that network communication between simulators is performed only when necessary is used.

Next, an example of processing by the DR algorithm will be described. First, the simulator has a model function unit and a communication function unit. The model function unit internally generates an entity. Further, the communication function unit holds an entity corresponding to the entity generated by the model function unit of the own simulator and an entity corresponding to the entity generated by the model function unit of the external simulator. When these entities utilize the DR algorithm, the former are called "DR internal entities" and the latter are called "DR external entities."

In the model function unit of each simulator, at the stage where the periodic simulation of the entity is executed, the model function unit periodically updates the spatial information of the entity at the current time. The spatial information includes at least position information, velocity information, and acceleration information. The model function unit outputs the spatial information update value, which is the update value of the spatial information, to the DR internal entity of the communication function unit in the same simulator.

The DR internal entity to which the spatial information update value is input calculates the spatial information extrapolated value of the entity at the current time by extrapolation based on the spatial information reference value held therein. Here, the spatial information reference value is spatial information exchanged between the communication function unit of the own simulator and the communication function unit of the external simulator.

Further, the DR internal entity to which the spatial information update value is input evaluates the difference between the input spatial information update value and the spatial information extrapolation value calculated by itself, and when the difference exceeds the transmission control threshold value, The spatial information update value is stored as a new spatial information reference value, and the spatial information reference value of the entity is transmitted to the communication function unit of the external simulator via the network.

The communication function unit of the destination simulator, which has received the spatial information reference value of the entity in the transmission source simulator, stores the spatial information reference value in the DR external entity corresponding to the entity. In the model function part of the destination simulator, when the entity of the model function part needs to refer to the spatial information in the source simulator, the spatial information stored in the DR external entity in the communication function part of the own simulator The spatial information extrapolated value at the current time calculated by extrapolation based on the reference value is used.

IEEE 1278.1-2012-Standard for Distributed Interactive Simulation-Application Protocols IEEE 1516.1-2010-Standard for Modeling and Simulation High Level Architecture-Federate Interface Specification SISO-STD-001-2015-Standard for Guidance, Rationale, and Interoperability Modality for the Real-time Platform Reference Federation Object Model.

Next, problems in the simulation system using the conventional DR algorithm will be described. The simulator that causes an action is called an "active side simulator", and the simulator that operates in response to the action of the active side simulator is called a "passive side simulator". The entity related to the action is referred to as a first entity, and the entity that is the target of the action caused by the first entity is referred to as a second entity. The first entity is generated by the model function unit of the active side simulator, and the second entity is generated by the model function unit of the passive side simulator. Also, the communication function unit of the active side simulator has a DR internal first entity and a DR external second entity, and the communication function unit of the passive side simulator has a DR external first entity and a DR internal second entity.

When the spatial function reference value of the DR internal first entity is transmitted from the communication function unit of the active side simulator, the passive side simulator causes the spatial information extrapolated value of the DR external first entity to An error occurs with the actual spatial information current value of the first entity in the side simulator. When such an error occurs, there arises a problem that inconsistent simulation results occur between the active side simulator and the passive side simulator.

In the DIS and RPR-FOM, which are conventional techniques, it is possible to change the above-described transmission control threshold value when executing the simulation. By reducing the transmission control threshold, it is possible to adjust the error between the spatial information extrapolated value of the DR external first entity in the passive simulator and the current spatial information of the first entity in the active simulator to be small. Is. However, if the transmission control threshold value is reduced, the spatial information reference value is transmitted to the network with high frequency, and the network load increases, which increases the possibility that the communication delay per time increases.

The increase in communication delay leads to a delay in updating the spatial information reference value of the DR external first entity, resulting in an increase in error in the spatial information extrapolated value of the DR external first entity. As a specific example, when a mobile entity with a moving speed of Mach 1 sets the difference in the direction of the transmission control threshold to 1 degree, if the spatial information reference value is delayed by 1 second, extrapolation calculation will result in a position error of about 6 m. Occurs. As described above, even when the transmission control threshold value is adjusted to be small, there is a problem that the positional error of the spatial information extrapolated value cannot be adjusted to a small value because the update of the spatial information reference value is delayed due to the increase in the network load.

As described above, in the conventional technique, an error occurs between the spatial information current value of the entity in the active side simulator and the spatial information extrapolated value of the DR external entity in the passive side simulator, and the active side simulator and the passive side simulator There was a problem that there was a case where a situation where the simulation was performed was inconsistent and an appropriate simulation could not be performed.

The present invention has been made in view of the above, and obtains a distributed simulation system that suppresses an error in a spatial information extrapolation value of a DR external entity in a passive-side simulator, and enables appropriate simulation. With the goal.

In order to solve the above-mentioned problems and achieve the object, a distributed simulation system according to the present invention has a plurality of simulators connected to a network, and performs communication control between the simulators using a DR algorithm. The simulator of the distributed simulation system has an external entity substitution function. The external entity substitution function exchanges information with the external entity simulated by the external simulator and simulates the same entity as the external entity instead of extrapolation calculation by the DR algorithm while the spatial information of the external entity is needed. Obtain spatial information by processing.

According to the present invention, it is possible to suppress the error in the spatial information extrapolation value of the DR external entity in the passive-side simulator, and to perform an appropriate simulation.

Block diagram showing a configuration example of a distributed simulation system according to an embodiment Block diagram when the distributed simulation system in Figure 1 is applied to a distributed real-time training simulation system for defense FIG. 2 is a block diagram showing a configuration in which an active-side entity replacement functional unit and an active-side entity control functional unit are excluded from the configuration of FIG. The figure which shows the example of the positional relationship of each entity in the logical simulation situation performed in the active side simulator and passive side simulator shown in FIG. FIG. 3 is a block diagram showing an example of a hardware configuration that realizes the functions of the active-side simulator and the passive-side simulator according to the embodiment.

Hereinafter, a distributed simulation system according to an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments described below.

Embodiment.
FIG. 1 is a block diagram showing a configuration example of a distributed simulation system according to an embodiment of the present invention. As shown in FIG. 1, the distributed simulation system 50 according to the embodiment includes an active-side simulator 1 and a passive-side simulator 2 that operates in response to an action of the active-side simulator 1. The active simulator 1 and the passive simulator 2 are connected via a network 3 so that they can communicate with each other. The active side simulator 1 and the passive side simulator 2 are both simulators that perform communication control using the DR algorithm.

The active-side simulator 1 has an active-side model function unit 11 and an active-side communication function unit 12. The active-side communication function unit 12 has a DR external entity function 12a and a DR internal entity function 12b.

The passive-side simulator 2 has a passive-side model functional unit 21, a passive-side communication functional unit 22, and an active-side entity substitute functional unit 23. The passive-side communication function unit 22 has a DR internal entity function 22a, a DR external entity function 22b, and an active-side entity control function 22c.

In the configuration of FIG. 1, the active side entity substitution function unit 23 and the active side entity control function 22c are newly provided function units in the distributed simulation system of the present embodiment. Details of these functions will be described later.

FIG. 2 is a block diagram when the distributed simulation system of FIG. 1 is applied to a distributed real-time training simulation system for defense. The same or equivalent components as in FIG. 1 are designated by the same reference numerals. In FIG. 2, an anti-ship missile model function 11A is built in the active-side model function unit 11. Although not shown in FIG. 2, in the active-side model function unit 11, an anti-ship missile entity is generated by the anti-ship missile model function 11A.

In the active side communication function unit 12, the DR external entity function 12a generates the DR ship entity 102, and the DR internal entity function 12b generates the DR anti-ship missile entity 103.

Further, the passive model function unit 21 has a ship model function 21A. Although not shown in FIG. 2, in the passive model function unit 21, the ship model function 21A generates the ship entity 201.

In the passive-side communication function unit 22, the DR ship entity 202 is generated by the DR internal entity function 22a, and the DR anti-ship missile entity 203 is generated by the DR external entity function 22b.

Next, the operation of the distributed simulation system according to this embodiment will be described. In order to facilitate understanding, first, the operation in the case where the active-side entity substitution function unit 23 and the active-side entity control function 22c that form the main part of the distributed simulation system of the present embodiment are not included will be described with reference to FIG. And FIG. 4 will be described. FIG. 3 is a block diagram showing a configuration in which the active-side entity substitution function unit 23 and the active-side entity control function 22c are excluded from the configuration of FIG. 3, the same or equivalent components as those in FIG. 2 are designated by the same reference numerals. Further, FIG. 4 is a diagram showing an example of the positional relationship of each entity in a logical simulation situation executed in the active side simulator 1 and the passive side simulator 2 shown in FIG.

First, when the simulation is started, the model function unit of each simulator creates an entity that it simulates, calculates the initial value of the spatial information of the entity, and outputs it to each communication function unit.

In the example of FIG. 3, the anti-ship missile model function 11A of the active side simulator 1 generates the anti-ship missile entity 101 that is a DR internal entity, calculates the spatial information initial value of the entity, and calculates the calculated spatial information. The initial value is stored as the spatial information reference value, and the calculated spatial information initial value is transmitted to the DR internal entity function 12b. Similarly, the ship model function 21A of the passive side simulator 2 generates the ship entity 201 which is the DR internal entity, calculates the spatial information initial value of the entity, and stores the calculated spatial information initial value as the spatial information reference value. At the same time, the calculated spatial information initial value is transmitted to the DR internal entity function 22a.

The communication function unit having received the spatial information reference value of each entity generates a DR internal entity corresponding to the entity of the model function unit, stores the spatial information initial value of the entity as the spatial information reference value, and stores the stored spatial information. The reference value is transmitted to the communication function unit of the external simulator via the network 3.

Explaining in the example of FIG. 3, the DR internal entity function 12b in the active side simulator 1 generates the DR anti-ship missile entity 103, stores the spatial information initial value of the DR anti-ship missile entity 103 as a spatial information reference value, and The stored spatial information reference value is transmitted to the DR anti-ship missile entity 203 in the passive side simulator 2 via the network 3. Similarly, the DR internal entity function 22a in the passive side simulator 2 generates the DR ship entity 202, stores the spatial information initial value of the DR ship entity 202 as a spatial information reference value, and stores the stored spatial information reference value as It transmits to the DR ship entity 102 in the active side simulator 1 via the network 3.

The communication function unit of each simulator that receives the spatial information reference value of the entity from the network 3 creates a DR external entity corresponding to the entity, and stores the received spatial information reference value in the DR external entity.

In the example of FIG. 3, the DR external entity function 12a in the active side simulator 1 generates the DR ship entity 102 and stores the received spatial information reference value in the DR ship entity 102. Similarly, the DR external entity function 22b in the passive side simulator 2 generates the DR anti-ship missile entity 203 and stores the received spatial information reference value in the DR anti-ship missile entity 203. The spatial information reference value exchanged between the simulators is defined by the protocol called "Entity State PDU (Protocol Data Unit)" in DIS, and the "Update Attribute Values service" in HLA in RPR-FOM. It is defined by the data "Spatial Attribute" of "Base Entity Object Class" that is transmitted and received to and from the "Reflect Attribute Values service".

Next, at the stage where the periodic simulation of the entity is executed in the model function of each simulator, the model function unit periodically updates the spatial information of the entity at the current time. The updated spatial information update value is output to the DR internal entity in the communication function unit in the same simulator.

Explaining with the example of FIG. 3, the anti-ship missile model function 11A of the active side simulator 1 periodically updates the spatial information of the anti-ship missile entity 101 at the current time, and updates the updated spatial information update value to the DR anti-ship. Output to the missile entity 103. Similarly, the ship model function 21A of the passive-side simulator 2 periodically updates the spatial information of the ship entity 201 at the current time, and outputs the updated spatial information update value to the DR ship entity 202.

The DR internal entity that has received the spatial information update value of the entity calculates the spatial information extrapolated value of the entity at the current time by extrapolation based on the stored spatial information reference value. The DR internal entity to which the spatial information update value is input evaluates the difference between the input spatial information update value and the spatial information extrapolation value calculated by itself, and when the difference exceeds the transmission control threshold, The spatial information update value is stored as a new spatial information reference value, and the spatial information reference value of the entity is transmitted to the communication function unit of the external simulator via the network 3. The default values of the transmission control thresholds in DIS and RPR-FOM are defined as a position difference of 1 m and a direction difference of 3 degrees.

Explaining with the example of FIG. 3, in the active-side simulator 1, the DR anti-ship missile entity 103 of the active-side communication function unit 12 receives the spatial information update value of the received anti-ship missile entity 101 and the stored DR anti-ship. Based on the spatial information reference value of the missile entity 103, extrapolation calculation is performed to calculate the spatial information extrapolated value of the DR anti-ship missile entity 103 at the current time. The DR anti-ship missile entity 103 evaluates the difference between the input spatial information update value and the spatial information extrapolation value calculated by itself, and if the difference exceeds the transmission control threshold, updates the spatial information update value. The spatial information reference value of the DR anti-ship missile entity 103 is transmitted to the DR anti-ship missile entity 203 of the DR external entity function 22b via the network 3 as well. Similarly, in the passive-side simulator 2, the DR ship entity 202 of the passive-side communication function unit 22 is based on the received spatial information update value of the ship entity 201 and the stored spatial information reference value of the DR ship entity 202. Then, the extrapolation calculation calculates the spatial information extrapolated value of the DR ship entity 202 at the current time. The DR ship entity 202 evaluates the difference between the input spatial information update value and the spatial information extrapolation value calculated by itself, and when the difference exceeds the transmission control threshold, the spatial information update value is updated to a new space. The spatial information reference value of the DR ship entity 202 is transmitted to the DR ship entity 102 of the DR external entity function 12a via the network 3 while being stored as the information reference value.

The communication function unit of the destination simulator, which has received the spatial information reference value of the entity in the transmission source simulator, stores the spatial information reference value in the DR external entity corresponding to the entity.

In the example of FIG. 3, the DR external entity function 12 a of the active simulator 1 stores the spatial information reference value received from the passive simulator 2 in the DR ship entity 102. Similarly, the DR external entity function 22b of the passive-side simulator 2 stores the spatial information reference value received from the active-side simulator 1 in the DR anti-ship missile entity 203.

In the model function unit of the destination simulator, if the entity of the model function unit needs to refer to the spatial information in the source simulator, the spatial information stored in the DR external entity in the communication function unit of the own simulator The spatial information extrapolated value at the current time calculated by extrapolation based on the reference value is used.

In the example of FIG. 3, the anti-ship missile entity 101 in the active side simulator 1 is stored in the DR ship entity 102 in the active side simulator 1 when it is necessary to refer to the spatial information in the passive side simulator 2. The spatial information extrapolated value at the current time calculated based on the existing spatial information reference value is used. Similarly, when the ship entity 201 in the passive side simulator 2 needs to refer to the spatial information in the active side simulator 1, the spatial information reference value stored in the DR anti-ship missile entity 203 in the passive side simulator 2 is stored. The spatial information extrapolated value at the current time calculated based on is used. In the extrapolation calculation based on the spatial information reference value, a motion calculation such as a constant velocity linear motion or a constant velocity rotary motion is appropriately selected and used according to the motion state of each entity.

Next, the battle simulation such as attack and defense and the damage simulation are performed between the anti-ship missile entity 101 simulated by the active side simulator 1 and the ship entity 201 simulated by the passive side simulator 2. The operation in this case will be described. The attack is an example of an "active action", and the defense is an example of a "passive action". Further, the battle is an example of an “action action” that collectively refers to an “active action” and a “passive action”.

The anti-ship missile entity 101 in the active-side simulator 1 that attacks the ship entity 201 simulates an attack by an attack means such as a shell or a missile based on the spatial information extrapolated value of the DR ship entity 102.

The anti-ship missile entity 101 transmits the result of the attack to the passive-side simulator 2 via the network 3 to the launch event of the anti-ship missile entity 101 and the meeting event of the anti-ship missile entity 101 to the DR ship entity 102.

In DIS, an event communicated between simulators is defined by a protocol called "Fire PDU" that corresponds to the launch of an attack entity and "Detonation PDU" that corresponds to a meeting of an attack entity with an attack target. Further, in the RPR-FOM, as the data transmitted and received by the "Send Interaction service" and the "Receive Interaction service" in the HLA, "Weapon Fire Interaction Class" corresponding to the launch of the attack entity and the attack target entity of the attack entity Is defined by the data "Munition Detonation Interaction Class" corresponding to the meeting.

The ship entity 201 of the passive simulator 2 receives the launch event and the meeting event transmitted from the active simulator 1. The ship entity 201 simulates the damage of the ship entity 201 based on the meeting event.

The passive simulator 2 receives the launch event before the meeting event, and simulates the DR anti-ship missile entity 203, and the spatial information extrapolated value of the DR anti-ship missile entity 203. Based on the above, it is possible to imitate an attack by a defense means such as an anti-missile weapon against the DR anti-ship missile entity 203. In this case, the launching event and the meeting event in the defense means entity are transmitted from the passive-side simulator 2 to the active-side simulator 1 via the network 3. Upon receiving the meeting event, the active simulator 1 simulates whether the passive simulator 2 has successfully defended.

In the above description, one attack and defense against the attack have been described, but during the simulation of the battle, the firing event and the meeting event between the active side simulator 1 and the passive side simulator 2 are due to the attack, Needless to say, it is repeatedly and complicatedly exchanged for a defense attack.

Next, problems of the conventional technology will be described. Although the problems of the prior art have been briefly described above, they will be described in detail here with reference to FIG.

FIG. 4 visually shows the simulated situation of the battle in the active side simulator 1 and the simulated situation of the battle in the active side simulator 1. In the diagram on the left side of FIG. 4, the course of the anti-ship missile entity that is the attacking entity toward the ship entity that is the attacking target is simulated. As described above, the spatial information reference value of the anti-ship missile entity is transmitted from the active simulator 1 to the passive simulator 2. Here, it is assumed that a communication delay occurs in the network. At this time, in the passive-side simulator 2, an error occurs between the spatial information extrapolated value of the anti-ship missile entity and the actual spatial information of the anti-ship missile entity in the actual active simulator. This situation is shown in the diagram on the right side of FIG. More specifically, in the passive-side simulator 2, the anti-ship missile entity is not coming toward the defending ship entity because of an error in the spatial information extrapolation value. In this way, when the communication delay occurs in the network, the situations simulated by the active side simulator 1 and the passive side simulator 2 respectively conflict. In this case, the trainee who is using the passive-side simulator 2 to perform ship defense training decides that there is no anti-ship missile coming to the ship entity and does not take defense action. However, in reality, the attack side simulator, the active side simulator, transmits a meeting event indicating damage to the ship. As a result, there arises a problem that simulation results that are inconsistent with respect to the trainee are generated.

In order to solve the above problems, in the distributed simulation system according to the present embodiment, as shown in FIGS. 1 and 2, the passive side simulator 2 has an active side model which is a model function unit of the active side simulator 1. The active-side entity replacement function unit 23 that replaces the entity simulated by the function unit 11 inside the passive-side simulator 2 and the passive-side communication function unit 22 that has the communication function of the passive-side simulator 2 execute the replacement function of the active-side entity. An active side entity control function 22c for controlling is constructed. The other configurations and functions are the same as or equivalent to the simulator of the conventional distributed simulation system using the DR algorithm.

The active-side entity substitute function unit 23 has a function of simulating the motion state of the same entity as the active entity simulated by the active-side model function unit 11 of the active-side simulator 1. According to the active-side entity substitution function unit 23, the passive-side simulator 2 exchanges information with the entity simulated by the active-side simulator 1, and extrapolates by the DR algorithm while the spatial information of the entity is needed. By performing the same entity as the entity simulated by the active side simulator 1 inside the passive side simulator 2 without performing the calculation or in place of the extrapolation calculation, the spatial information of the entity simulated by the active side simulator 1 is obtained. Can be obtained.

Here, consider a case where the active entity modeled by the active model function unit 11 of the active simulator 1 is a missile. A typical missile flies along a route guided from a launch point or launch platform toward a destination or target, but for each type of missile, a flight including speed and altitude depending on the distance after launch or with the target is launched. Sho profile has been decided. Therefore, the active-side entity substitute function unit 23 can simulate a motion state based on the same flight profile as the attack entity simulated by the active-side model function unit 11 of the active-side simulator 1.

The active-side entity substitution function unit 23 suspends its operation until the active-side entity control function 22c controls execution start and execution end.

When the active-side entity control function 22c receives the attack event of the attacking entity from the active-side simulator 1, the active-side entity substitution function unit 23 starts executing. In addition, the execution of the active side entity substitution function unit 23 ends when the active side entity control function 22c receives the meeting event from the active side simulator 1.

Upon starting execution, the active-side entity alternative function unit 23 starts simulating the motion state of the active entity based on the information included in the firing event received by the passive-side simulator 2 that triggered the execution. The launch event includes at least the coordinates of the launch point, the type of active entity that was launched, and the velocity vector when it was launched. The launch event is information defined in “Fire PDU” of DIS and “Weapon Fire Interaction Class” of RPR-FOM. The active-side entity alternative function unit 23 that has started execution calculates the spatial information current value of the active entity in place of the DR external entity function 22b in the passive-side communication function unit 22 of the passive-side simulator 2 until the end. ..

As described above, the active-side entity substitute function unit 23 of the passive-side simulator 2 detects the motion state of the same active entity as that of the active-side simulator 1 from the reception of the launch event of the active entity to the reception of the meeting event. Simulate. At this time, since the active-side entity substitution function unit 23 calculates the spatial information current value of the active entity in place of the DR external entity function 22b, the problem exposed in the prior art, that is, the DR external entity function 22b calculates. It is possible to solve the problem due to the error between the spatial information extrapolated value and the spatial information current value. As a result, the distributed simulation system according to this embodiment can perform an appropriate simulation.

In the present embodiment, the simulation performed between one active-side simulator 1 and one passive-side simulator 2 has been described, but the number of active-side simulators 1 may be plural. The number of the passive simulators 2 may be plural. Further, in the present embodiment, the active-side simulator 1 and the passive-side simulator 2 are fixedly handled, but in various simulation aspects, the active-side simulator 1 becomes the passive-side simulator and the passive-side simulator 2 becomes the active-side simulator. It can also be a simulator. In this sense, the simulator that causes the action may be referred to as an "external simulator", and the simulator that corresponds to the action caused by the external simulator may be simply referred to as a "simulator". Also, an entity generated by an external simulator that causes an action may be referred to as an “external entity”, and an entity generated by a simulator corresponding to the action may be simply referred to as an “entity”. Further, the active-side entity substitute function unit 23 built in the passive-side simulator 2 is referred to as “external entity substitute function unit” or “external entity substitute function”, and is built in the passive-side communication function unit 22 of the passive-side simulator 2. The active side entity control function 22c may be referred to as an “external entity control function”.

As described above, according to the distributed simulation system according to the present embodiment, the simulator configuring the distributed simulation system has an external entity substitution function, and the external entity substitution function is an external entity simulated by the external simulator. While exchanging information with the external entity and requiring the spatial information of the external entity, without performing extrapolation calculation by the Dead-Reckoning algorithm, or instead of extrapolation calculation, by the simulated processing of the same entity as the external entity. Since the spatial information is calculated, it is possible to suppress an error between the current spatial information value of the external entity simulated by the external simulator and the spatial information extrapolated value calculated by itself. As a result, it is possible to suppress the occurrence of discrepancy between the situations simulated by the simulator and the external simulator, and to provide an appropriate simulation environment to the training target.

Finally, a hardware configuration for realizing the functions of the active side simulator 1 and the passive side simulator 2 in the distributed simulation system according to the present embodiment will be described with reference to the drawing of FIG. FIG. 5 is a block diagram showing an example of a hardware configuration that realizes the functions of the active simulator 1 and the passive simulator 2.

When the functions of the active-side simulator 1 and the passive-side simulator 2 are realized, the active-side simulator 1 and the passive-side simulator 2 are, as shown in FIG. 5, a CPU (Central Processing Unit) that performs various processes. 82 and an input/output unit 83 which is an input/output interface with the network 3. The active-side simulator 1 and the passive-side simulator 2 each include a RAM (Random Access Memory) 84 including a program storage area and a data storage area, and a ROM (Read Only Memory) 85 that is a non-volatile memory. The bus 86 connects the CPU 82, the input/output unit 83, the RAM 84, and the ROM 85. The CPU 82 may be a computing unit such as a microprocessor, a microcomputer, a processor, or a DSP (Digital Signal Processor).

The ROM 85 stores programs for various processes. The program may be recorded in a drive-readable recording medium other than the ROM 85. The recording medium may be a portable recording medium such as a CD-ROM, a DVD disc, a USB memory, or a semiconductor memory such as a flash memory.

The program is loaded into the RAM 84. The CPU 82 expands the program in the program storage area in the RAM 84 and executes various processes. The data storage area in the RAM 84 is a work area for executing various processes. The above-described functions of the active-side model function unit 11, the active-side communication function unit 12, the passive-side model function unit 21, the passive-side communication function unit 22, and the active-side entity replacement function unit 23 are realized using the CPU 82. It

Note that the configurations described in the above embodiments are examples of the content of the present invention, and can be combined with other known techniques, and the configurations are within the scope not departing from the gist of the present invention. It is also possible to omit or change a part of.

1 active side simulator, 2 passive side simulator, 3 network, 11 active side model function unit, 11A anti-ship missile model function, 12 active side communication function unit, 12a, 22b DR external entity function, 12b, 22a DR internal entity function, 21 passive side model function part, 21A ship model function, 22 passive side communication function part, 22c active side entity control function, 23 active side entity replacement function part, 50 distributed simulation system, 82 CPU, 83 input/output part, 84 RAM, 85 ROM, 86 bus, 101 anti-ship missile entity, 102,202 DR ship entity, 103,203 DR anti-ship missile entity, 201 ship entity.

Claims (6)

A distributed simulation system having a plurality of simulators connected to a network and performing communication control between simulators using a Dead-Reckoning algorithm,
The simulator is
While exchanging information with an external entity simulated by an external simulator and requiring spatial information of the external entity, a simulation process of the same entity as the external entity is performed instead of the extrapolation calculation by the Dead-Reckoning algorithm. and external entities alternative function of acquiring space information by,
An external entity control function of detecting that the external simulator requires spatial information of an external entity simulated by starting an active action from the external simulator,
The distributed simulation system, wherein the external entity control function starts execution of the external entity substitution function upon detection of the start of the active action . The distributed simulation system according to claim 1 , wherein the detection of the start of the active action is detected by receiving a "Fire PDU" of DIS. The distributed simulation system according to claim 1 , wherein the detection of the start of the active action is detected by receiving data of an RPR-FOM "Weapon Fire Interaction Class" in the "Receive Interaction service" of the HLA. The distributed simulation system according to claim 1 , wherein the detection of the start of the active action is detected by receiving data of "Munition Detonation Interaction Class" of RPR-FOM in "Receive Interaction service " of HLA. The external entity control function detects that the spatial information of the external entity is no longer needed by the end of the active action, and ends the execution of the external entity substitution function by the end or disappearance of the active action. The distributed simulation system according to any one of claims 1 to 4 . The distributed simulation system according to claim 5 , wherein the end of the active action is detected by receiving a "Detonation PDU" of DIS.

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