Distributed interaction simulation-dis

1. Introduction to DIS System

Distributed Interactive Simulation originated from the simnet plan jointly developed by the Defense Advanced Research Projects Agency (DARPA) and the US Army in 1983. It is an expression of a comprehensive environment with time-space consistency, interoperability, and scalability. Dis adopts consistent structures, standards, andAlgorithmThe network is used to interconnect and interoperate different types of Simulation Applications scattered in different geographical locations with the real world, and build a comprehensive environment where people can participate and interact.

In terms of architecture, the basic structure and implementation methods of DIS have the following characteristics:

1. No Central Computer Controlling the entire Simulation Drill

Some simulation systems (such as network mud) Use a central computer to maintain the overall state, and calculate the impact of each entity action on other entities and environments, such a system must determine the resource configuration based on its maximum potential load to be able to handle the computing load in extreme cases. Dis uses the distributed simulation method to leave the task of simulating the entity state to an independent simulation computer connected through the network.

2. Transmit underlying real data using a standard protocol

Each simulation application calls the state of the entity controlled (measured) by it (the position, direction, speed, and the position of the hinge component as the underlying real data) transmitted to other Simulation Applications in the network. the receiver is responsible for receiving and calculating the information to determine whether the entity represented by the sender can be perceived by a visual or electronic device, the perceived entity status is displayed to the user according to the requirements of a single simulation.

3. Platform-Level System Simulation

Dis makes full use of the powerful distributed computing capabilities provided by modern computer networks to simulate complex large systems. This is different from the previous single computer system simulation strategy. For example, if a single computer is used for simulation of a combat process, the probability model (typical Lanchester equation) can only be used for large-granularity modeling and simulation due to the limitations of the computing capability, without sufficient experimental data, the simulation results of this probability model have low reliability. While DIS provides granularity-level simulation based on the weapon platform, and simulates large systems through large-scale networking. Obviously, the simulation model of a single weapon platform is easier to establish than that of a single combat process, and has a higher level of reliability. Therefore, the simulation results of DIS simulate the actual system more realistically.

In terms of technical features, DIS also has three major features: interoperability, scalability, and simulation time-space coherence. Next we will introduce the technical methods of DIS in these three aspects.