Geological survey management and service networking based on Beidou technology

The networking of geological survey management and service based on Beidou technology refers to a set of network composition framework which integrates information service, monitoring command and safety guarantee functions by using the communication command function of Beidou satellite and combining the management level and working mode of geological survey, and the satellite and ground network are redundant. Scientific and effective networking framework is the first and guarantee for using Beidou to serve the field geological survey.

According to the management structure and hierarchy of geological survey, the network structure is centered on China Geological Survey and roughly divided into four levels: geological survey center node, regional center and sub-center node of geological survey institute, field resident node and mobile operation node.

(1) Central Node of Geological Survey

The top layer of networking architecture, deployed in the network center of Geological Survey, has the function of monitoring and commanding other regional centers and sub-center nodes such as Geological Survey and all Beidou mobile terminal nodes, and can provide special information services such as SMS forwarding, regional early warning and announcement information services, and automatic notification of emergencies.

(2) The regional center and the Geological Exploration Institute are equally divided into central nodes.

It belongs to the central node of Geological Survey and is deployed in regional centers, provincial geological survey institutes or field workstations, and can command and monitor the field project resident nodes and Beidou mobile terminals within its jurisdiction.

(3) Resident nodes in other places

Deployed in the site project team's residence, it is mainly used to monitor and command the site operation team to ensure safety; meanwhile, it is monitored by the superior central node, responsible for communicating with the superior node and reporting the working status and emergency handling in time.

(4) Mobile operation node

Mainly refers to the field workers, vehicles or large equipment equipped with Beidou terminal. They can communicate with each other by using the short message function of Beidou, and also accept the monitoring and command of field stations and superior central nodes. In case of emergency, you can use the quick alarm function provided by the system to ask for help.

Four-level network nodes can be interconnected by Beidou satellite, and the upper node has the function of monitoring and commanding the lower nodes. The primary and secondary nodes belong to fixed command nodes, and generally have ground networking conditions, and can use the Internet for data synchronization and intercommunication, thus forming a dual-link redundant networking architecture of satellites and networks (Figure 6. 10).

Figure 6- 10 Topology Structure of Geological Survey Network Based on Beidou

Second, the construction and deployment of network nodes.

Nodes at all levels should be equipped with different types of Beidou equipment and software systems due to different working methods and jurisdiction. As the general center, the nodes of Geological Exploration Bureau should monitor all nodes, so a centralized Beidou commander with many subordinate users (at most 1000 users) was deployed. The regional center has a larger jurisdiction and can also be equipped with a central Beidou commander: small and medium-sized management nodes such as provincial geological survey institutes can choose ordinary Beidou commanders with fewer subordinate users (at most 100 users) (Figure 6- 1 1). The above nodes are fixed in position and the network environment is stable. The software system can be equipped with GSIGrid field geological survey management service and safety guarantee system. The field station has the dual identities of command node and mobile node, and can be equipped with both ordinary Beidou commander and Beidou mobile terminal. Because most field stations have no ground network environment, the software system is equipped with a digital geological survey information comprehensive platform DG SInfo, which can be used independently. The mobile node is equipped with a handheld or vehicle-mounted Beidou terminal according to the working mode, and the software adopts the digital mapping field data acquisition system RGM ap (Figure 6- 12).

Third, realize the dynamic networking mode.

The subordinate relationship between the early Beidou command equipment and its subordinate terminals is generally statically bound, that is, it is solidified at the factory and cannot be dynamically adjusted by users at will. This is very unfavorable to the current situation of large mobility and complicated subordinate relationship of geological staff. For example, Fujian Geological Prospecting Team undertakes the Qinghai-Tibet Plateau Project, and its subordinate relationship should be dynamically increased to the management departments such as field workstations or regional centers in Qinghai-Tibet region to provide more direct and effective guarantee and information services.

In order to realize the dynamic binding of Beidou command subordination, this project jointly tackled the problem with Beidou equipment manufacturers, carried out technical transformation on the existing Beidou command machine, achieved a technical breakthrough from the original static subordination based on Beidou card to the current dynamic binding based on Beidou command machine hardware, and developed a simple and easy-to-use subordinate setting software, which laid the foundation for establishing a unified and flexible geological survey Beidou networking architecture (Figure 6- 13).

Figure 6- 1 1 Beidou satellite communication and navigation system geological survey equipment configuration and networking diagram

Fig. 6- 12 Node Deployment Diagram of Digital Geological Survey Software System Based on Beidou

Figure 6- 13 Dynamic setting of the card interface of the commander's subordinates.

Fourth, the central node Beidou database construction

Beidou monitoring database is established at the geological survey center node and other sub-center nodes to monitor, store and manage Beidou data. The Beidou information database model is shown in Figure 6- 14. Among them, the regional information table and provincial information table are dictionary tables, the positioning information table and communication information table are Beidou original information tables, and the real-time positioning table and routing information table are extracted and merged on the basis of positioning information, mainly to improve the efficiency of real-time display of positioning information and routing tracking display at W EB end. Announcement information table and regional information table are service information tables, which mainly provide services for monitoring subordinate announcement inquiry, regional early warning and regional geological and humanistic information inquiry.

By the end of 20 12 and 12, the central node of Geological Exploration Bureau has established 186 pieces of Beidou monitoring personnel information, 232 pieces of Beidou equipment information, 16025 pieces of communication short messages, 87,923 pieces of Beidou positioning records and 2,446 Beidou monitoring routes (Figure 6.

Fifth, the automatic synchronization mechanism of node autonomy information

Node information at all levels can be roughly divided into two categories according to data sources: ① Information obtained by Beidou monitoring: including positioning information and interactive communication information. ② Node autonomy information: including equipment card information, company information and personnel information. According to different data sources, data is transmitted between nodes in different ways. Beidou monitoring information of nodes is realized through the dynamic binding of equipment card number and commander monitoring function. The Beidou information monitored by the lower nodes will be monitored by all the commanders of the upper nodes at the same time, and Beidou satellite will be used as the air link for data transmission. The information of node autonomy is maintained by each node.

In order to realize the effective management of superior nodes to subordinate nodes, subordinate nodes must report their node autonomy information in real time. If the Beidou personnel table of Xi 'an Center changes, the corresponding personnel information of the central node of Geological Exploration Bureau needs to change. Based on this consideration, the project team established a synchronous updating mechanism for automatic reporting of independent information of nodes at all levels, relying on the geological survey information grid platform, which ensured the timeliness of basic information of senior nodes. The synchronization mechanism of nodes is realized by taking the initiative step by step. The W eb interface providing external data services is deployed on the W eb server of the lower nodes of the system, and each lower node only provides services to its upper nodes, but not to the upper nodes. Therefore, IP address restrictions are added to the service interface to ensure that only the designated upper nodes can obtain the provided data services, thus increasing data security. Deploy an automatic data acquisition update program on the W eb server of the upper node, obtain the autonomy information of the lower node by calling the data service interface of the lower node, and update and maintain the relevant records in the database according to the keyword fields of the information, so as to ensure the synchronization of autonomy information among nodes at different levels, as shown in Figure 6- 16.

Figure 6- 14 Beidou information database model diagram

Figure 6- 15 Query of all short messages in the central node

Fig. 6- 16 schematic diagram of node autonomy information synchronization

Construction of intransitive verb network system

The networking mode and system software of geological survey based on Beidou satellite technology have been popularized and applied since March 20 1 1 year. The first batch of demonstration nodes are mainly deployed in the northwest, northeast and southwest areas where no man's land or dangerous areas are widely distributed in China.

By the end of 20 12, the construction of demonstration nodes of Geological Survey Center, Xi 'an Geological Survey Center, Chengdu Geological Survey Center, Shenyang Geological Survey Center, Qinghai Geological Survey Institute, Tibet Geological Survey Institute, Yunnan Geological Survey Institute, Sichuan Geological Survey Institute, Xinjiang Geological Survey Institute and China Geo University (Wuhan) Geological Survey Institute has been completed. Four central nodes, seven provincial sub-nodes and two project-level nodes will be built. * * * Four central Beidou commanders, 12 ordinary Beidou commanders and more than 200 Beidou positioning communication terminals were deployed, and relevant technical training was carried out, with about 900 trainees, which achieved good application results.