A hierarchical hybrid time synchronization method for remote simulation systems

Abstract

The present invention discloses a hierarchical hybrid time synchronization method applied to a remote simulation system, which is mainly implemented through a three-layer method: the first layer is to build a hardware clock server by installing a clock board in a remote distributed high-real-time simulation system node to receive the clock signal transmitted by the Beidou system. A remote software clock server is built, and the hardware clock server sends a time signal to the remote software clock server through a wide area network. The second layer of the hardware clock server and the software clock server send time signals to the business servers in the system through the local system LAN; the third layer of the business application layer, each business end relies on the wide area network to exchange data based on the synchronized time signal. The time consistency of each simulation node of the remote simulation system is achieved, which solves the problem of inconsistent time and frequency requirements of large-scale remote simulation systems and the inability to meet all system differences in one node, while reducing the construction cost.

Description

Technical Field

[0001] The invention belongs to the technical field of integrated interconnection of remote simulation systems, and in particular to a hierarchical hybrid time synchronization method applied to remote simulation systems. Background Art

[0002] In a large-scale remote simulation system, each complete simulation subsystem has its own independent time and space description method. When different remote simulation systems are interconnected to form an integrated simulation system, the time, space description method and granularity of the remote simulation system of each node are inconsistent, resulting in inconsistent time information and space information in the integrated and interconnected remote simulation system. Time and space consistency is a basic requirement for remote simulation systems. However, the phenomenon of system time and space inconsistency is ubiquitous. In large-scale remote simulation systems, there are many entities and long running times. In addition, the limited level of integration technology will aggravate the degree of system time and space inconsistency.

[0003] The problem of time and space inconsistency is particularly evident in heterogeneous systems. The standards for system construction are inconsistent, and they are built independently and self-contained. Each system has its own main field of use and its own time and space description method. However, in the integration construction of remote systems, the integrated system is required to maintain time and space consistency to facilitate interoperability. The existence of these two contradictions requires the construction of a new method to solve the time consistency of remote simulation systems. Summary of the invention

[0004] The purpose of the present invention is to provide a hierarchical hybrid time synchronization method applied to remote simulation systems. By adopting a hierarchical hybrid synchronization method of "hardware plus software", the problems of "high cost of time synchronization caused by global application hardware", "low time accuracy caused by synchronization of all application software" and "difficulty in time synchronization due to the remote and heterogeneous characteristics of the joint system" are solved.

[0005] The technical solution to achieve the purpose of the present invention is:

[0006] A hierarchical hybrid time synchronization method for a remote simulation system is implemented in the following manner:

[0007] Divide the remote simulation system into high real-time simulation subsystem and general real-time simulation subsystem according to the moving speed;

[0008] A hardware clock server is built by installing a clock board in the high real-time simulation system node to locate the clock signal emitted by the navigation system; a software clock server is built in the general real-time simulation subsystem, and the hardware clock server sends the time signal to the software clock server in a different location through the wide area network;

[0009] The hardware clock server and software clock server send time signals to the business servers in their respective systems through the local system LAN; each business server interpolates the time signal in accordance with the requirements of the simulation system of the node for the simulation frequency to meet the requirements of the simulation business end for the time frequency;

[0010] The business servers of the high real-time simulation subsystem and the general real-time simulation subsystem exchange data based on synchronized time signals and rely on the wide area network.

[0011] Compared with the prior art, the present invention has the following significant advantages:

[0012] It avoids the high cost of hardware-based time synchronization caused by the full application of the Beidou system, and the large delay and low precision of time synchronization in application software, which increases the computer processor overhead. It solves the problem of clock synchronization difficulty in remote simulation systems. According to the personalized needs of the remote simulation system's participating nodes for real-time requirements, the present invention proposes methods of "hardware + software layered mixed time synchronization" and "layered cutting of clock signal sources". While solving the problem of time inconsistency in large-scale remote simulation systems, it reduces construction costs and provides a solution for time synchronization of integrated interconnection of large-scale remote simulation training systems. The above methods are combined to solve the problem of time inconsistency in remote systems and provide technical means for the integrated application of remote simulation systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The present invention is a flow chart of a hierarchical hybrid time synchronization method applied to a remote simulation system. DETAILED DESCRIPTION

[0014] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0015] Combination Figure 1 The present invention proposes a hierarchical hybrid time synchronization method for a remote simulation system, which comprises the following steps:

[0016] Step 1: Design the remote simulation system in general and divide it into "high real-time simulation subsystem" and "general real-time simulation subsystem". The division method is usually that the simulation system with an average moving speed of "main entities in the simulation system" higher than 80km / h is a "high real-time simulation system", otherwise it is a "general real-time simulation subsystem". For example, the simulation objects of the "Air Force and Rocket Force Simulation Subsystem" are mostly high-speed objects such as "missiles" and "aircraft", with strong real-time interaction, which is a "high real-time simulation subsystem"; the simulation objects of the "Logistics Support Force Subsystem" are mainly "cars", with low speed and low real-time interaction, which is a "general real-time simulation subsystem".

[0017] Step 2, the first layer, in the remote distributed high real-time simulation system node, a hardware clock server is built by installing a clock board to receive the clock signal transmitted by the Beidou system (BD). A remote software clock server is built, and the hardware clock server sends a time signal to the remote software clock server through the wide area network. For the time delay when the remote physical network transmits data, the time compensation is performed through the dead-time algorithm. At the hardware clock server, the 1 Hz clock signal transmitted by Beidou is divided in proportion to the ratio of the timer clock frequency and the frequency used by the digital filter to meet the demand of the remote high real-time simulation system for the clock signal source.

[0018] Step 3, the second layer, the hardware clock server and the software clock server send time signals to the business servers in their respective systems through the local system LAN; each business server interpolates the time signal in accordance with the requirements of the simulation system of the node for the simulation frequency to meet the requirements of the simulation business end for the time frequency;

[0019] Step 4, the third layer, the business application layer, each business end exchanges data based on the synchronized time signal and relies on the wide area network.

[0020] The hardware and software clock servers are consistent through computer time, and the navigation algorithm is used to solve the fixed delay, ensuring the consistency of time between the hardware clock server and the software clock server between remote subsystems.

Claims

1. A hierarchical hybrid time synchronization method for a remote simulation system, characterized in that: This is accomplished by: Divide the remote simulation system into high real-time simulation subsystem and general real-time simulation subsystem according to the moving speed; A hardware clock server is built by installing a clock board in the high real-time simulation system node to locate the clock signal emitted by the navigation system; A software clock server is built in the general real-time simulation subsystem, and the hardware clock server sends time signals to a remote software clock server through a wide area network. The hardware clock server and software clock server send time signals to the business servers in their respective systems through the local system LAN; each business server interpolates the time signal in accordance with the requirements of the simulation system of the node for the simulation frequency to meet the requirements of the simulation business end for the time frequency; The business servers of the high real-time simulation subsystem and the general real-time simulation subsystem exchange data based on synchronized time signals and rely on the wide area network.

2. The hierarchical hybrid time synchronization method for a remote simulation system according to claim 1, characterized in that: The time delay that occurs when data is transmitted over a physical network in a different location is compensated for through a navigation algorithm.

3. The hierarchical hybrid time synchronization method for a remote simulation system according to claim 1, characterized in that: At the hardware clock server, the clock signal transmitted by Beidou is divided in proportion to the frequency of the timer clock frequency and the frequency used by the digital filter, meeting the requirements of the remote high-real-time simulation system for the clock signal source.

4. The hierarchical hybrid time synchronization method for a remote simulation system according to claim 1, characterized in that: For simulation systems with an average moving speed higher than 80km / h, they are high real-time simulation systems; otherwise, they are general real-time simulation subsystems.

5. The hierarchical hybrid time synchronization method for a remote simulation system according to claim 1, characterized in that: The positioning and navigation system adopts the Beidou system.

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