Research and Development of Geological Survey System Based on Beidou Satellite Technology

Combining Beidou-1 navigation satellite system with geological survey system is a typical application of satellite technology in the field of field geological survey in China. On the one hand, the introduction of Beidou-1 navigation satellite system has improved the function of geological survey system, made it have communication function, and enhanced the information service and security guarantee ability of the system; On the other hand, the wide application of geological survey system provides a technical and hardware foundation for the promotion of Beidou-1 navigation satellite system, which is conducive to its rooting and rapid development in the field of geological survey.

The general idea of system integration and research and development is to deeply integrate Beidou-1 navigation satellite system technology with digital geological survey workflow in software and hardware. In terms of software, the positioning, communication and monitoring functions of Beidou-1 navigation satellite system are integrated with mature digital survey software systems in geological survey field data collection, indoor data sorting and management scheduling, including three subsystems: ① digital mapping field data collection system (RGMAP); ② Digital Geological Survey Information Integration Platform (DGSInfo); ③GSIGrid field geological survey management service and safety guarantee system.

1. Digital Surveying and Mapping Field Data Acquisition System (RGM ap)

The digital mapping field data acquisition system (RGMap) is suitable for mobile nodes working in the field and runs on handheld devices. The system supports Beidou Bluetooth mobile module and most kinds of Beidou mobile integrated machines (screen size is not less than 3.5 inches, operating system is Windows Mobile or Android series). Among them, the Beidou Bluetooth module is connected with the program through the Bluetooth function, and the Beidou module in the integrated machine is directly connected with the program through the serial port. Due to the small amount of data stored in PDA, it is convenient for users to edit from outside. The system uses xml file to store Beidou data. The functional framework of the system is shown in Figure 6- 17.

Figure 6-17 Functional Framework of Beidou Information Management Module of RGMAP Digital Mapping System

The functional modules of the system are divided into basic functions, safety-related functions and active response functions. The system not only has the basic Beidou satellite positioning and communication functions, but also fully combines GIS, GPS and mobile phone communication to provide real-time location service, communication service and security service for field geological investigators.

. 1 Beidou-1 and GPS dual-mode position reporting mechanism

Position submission is an important function provided by Beidou-1 navigation satellite system for field geological work. It enables field geological investigators not only to know their own positions, but also to inform others of these position information, which is the basis for realizing real-time monitoring and safety guarantee of field work. Location submission needs to locate first, and then send the location information to the designated node through Beidou SMS. Due to the limited positioning function of Beidou-1 navigation satellite system itself, such as low signal strength and limited positioning frequency (the frequency of general civil cards is 1 minute, that is, it can be positioned once every minute), the system adopts the joint application of GPS and Beidou-1 satellite system to realize the position reporting function of 1 frequency.

2. Send urgent information quickly

Users can pre-set the address book and short message content for sending emergency short messages, and call the police with one button in case of emergency. Urgent messages are sent one by one according to the order in the address book, and users can adjust the priority of addresses. Because the field station is the most convenient node to carry out rescue, its address is usually set at the first time. The emergency SMS interface is shown in Figure 6- 18.

3. SMS interworking between Beidou terminal and mobile phone.

By forwarding the command node server, the short message communication between Beidou terminal and mobile phone can be realized, and real-time communication with the outside world can be maintained in dangerous areas without mobile phone network. When the Beidou terminal sends a short message to the mobile phone, the system will automatically add the command header "# # PM[[ mobile phone number] #" (Figure 6- 19) before the short message, and then send the short message spontaneously and automatically. When the server detects that the message is received, it will forward the message content and Beidou card number to the mobile phone number through the mobile phone cat. When the mobile phone replies to a short message, it must edit the short message header "b[ Beidou card number] m". This process is shown in Figure 6-20.

Figure 6- 18 RGMap Beidou Emergency SMS

Figure 6- 19 RGM Associated Press Editing SMS

Figure 6-20 Communication process between Beidou and SMS

4. Information inquiry service

At present, it includes two functions: unit announcement information query and regional early warning information query. The information inquiry function of unit announcement enables field geological surveyors to conveniently inquire about the latest announcement of the competent unit (Figure 6-2 1), so as to grasp the latest work trends. The query function of regional early warning information is to establish a regional basic information database at the command node, including early warning, geological background, geography and humanities of the work area, etc., so as to facilitate field geological investigators to enter unfamiliar areas for query.

Figure 6-2 1 RGMap announcement information query

Second, Digital Geological Survey Information Integrated Platform (DG SInfo)

Digital Geological Survey Information Integration Platform (DGSInfo) is suitable for small and medium-sized fixed management nodes such as field stations or provincial geological survey institutes, and has all the functions of Beidou mobile terminal and some functions of Beidou server management program. The program accesses Beidou equipment through serial port, which can be connected with Beidou master control computer (under the jurisdiction of 100 users) as a simple management node, and can also be connected with Beidou vehicle-mounted machine and Bluetooth module. As a mobile terminal.

The system obtains data from Beidou equipment and uses Access database to store data. Functional modules are divided into basic functions, Beidou information comprehensive query function and Beidou information visualization function. See table 6- 1 for specific functions and descriptions, and see figure 6-22 for system commands and monitoring interfaces.

Table 6- 1 DGSInfo Beidou monitoring and command system function list

Figure 6-22 DGSInfo Beidou Monitoring Interface

Beidou console (Figure 6-23) is the core tool for DGSInfo to realize command and monitoring by using Beidou-1 navigation satellite system. Through the Beidou console, users can conveniently monitor the location and short messages of the terminals under their jurisdiction, communicate with them in real time, and support the query and browsing of historical data.

Figure 6-23 Beidou Console

1) Effective time setting of information: control the effective time of currently displayed information, and set the time value and time unit (mhi/h/d).

2) Drawing information refresh: two modes can be selected: automatic refresh and manual refresh.

3) Currently displayed users: query user positioning information according to the effective time. Note that this is the latest location information of users, so each user only corresponds to 1 records.

4) SMS: query the SMS information of users according to the effective time. You can link graphic points or reply to any short message.

5) Beidou transaction queue: record the tasks that Beidou has not yet executed in the queue, and automatically execute them in sequence if the frequency allows. You can pause, delete, and empty transaction queues. Note: There are two modes for Beidou trading to enter the queue: active and passive. "Active" transaction refers to the transaction generated by the direct operation of this machine, such as local location, local communication, local call to other users, etc. "Passive" transaction refers to service requests sent by other users, such as recent user inquiries from other users and incoming calls from other users. The default "active" transaction in the program has higher priority, so it will be inserted in front of the queue and processed first; "Passive" transactions have a low priority and will be stacked at the end of the queue, waiting for the frequency, and processed in order.

6) View the national map: When the information of the users under its jurisdiction is beyond the scope of this map, you can use this function to view it in the pop-up national map (1: 5000000).

7) Restore Default Configuration: Restore some configurations in the dialog box to the system default values.

Digital Geological Survey Information Integration Platform (DGSInfo) is mainly used for real-time communication, command and scheduling of field projects after integrating Beidou functions, so as to realize the monitoring and safety guarantee of field workers in the station and ensure the progress and quality of field operations.

Third, the management service and guarantee system of G SIG rid field geological survey

GSIGrid field geological survey management service and support system mainly adopts Beidou satellite (positioning and communication) technology. Based on China Geological Survey Information Grid (GSIG rid), it can realize real-time monitoring of mobile nodes' moving trajectory and communication information at fixed nodes such as Geological Survey, regional center or field workstation, and can interact with field stations and moving targets to realize modern production scheduling and management services. At the same time, the rich data resources of the central node are used to provide query services for field geological surveyors and provide data support for emergency response management and decision-making.

The system adopts B/S architecture, represented by W eb three-dimensional earth, the geographical map refers to the sky map issued by the State Bureau of Surveying and Mapping, and the Beidou information data is managed by Oracle database. Its main functions include real-time monitoring (positioning and communication) personnel information inquiry, Beidou historical information inquiry (positioning and communication), route tracking, emergency search and rescue, interactive communication and path analysis (Figure 6-24).

See Figure 6-25 for the functional design structure of GSIGrid field geological survey management service and safety guarantee system.

Figure 6-24 Monitoring and Command Function of GSIGRID Field Geological Survey Management Service and Security System

Figure 6-25 Functional Design Structure Diagram of GSIGRID Field Geological Survey Management Service and Security Assurance System

As can be seen from Figure 6-25, the functional composition of the system can be roughly divided into two parts: ① Beidou information management system; ②GSIGrid field geological survey management service and safety guarantee system. Wherein each system can be divided into a plurality of functional modules according to functional types.

Beidou information management system can be divided into three modules according to functional types: equipment management module, database management module and comprehensive service, as shown in Figure 6-26:

1) equipment management module: This module mainly includes the functions of Beidou commanding user machine serial connection, status information viewing, signal strength viewing and so on. Realize the management of hardware equipment information.

2) Database management module: it mainly realizes the functions of database creation and table information management, mainly including: ① receiving and storing Beidou monitoring data, and storing Beidou information of subordinate users monitored by the commander in Beidou information database. ② Company, personnel and card number information management: add, delete and update company information, user information and Beidou equipment card information, and bind cards with personnel, as shown in Figure 6-27. ③ Announcement information management function: realize the functions of adding, deleting and updating the company's announcement information. ④ Regional information management function: realize the functions of adding, deleting and updating unit regional information, including regional early warning information, regional geological information and regional humanistic information.

Figure 6-26 Functional Design of Beidou Information Management System

Figure 6-27 Company, Personnel and Card Number Information Management Interface

3) Comprehensive service module: This function module makes full use of the positioning information of lower users and the rich data resources of the central node to provide users with humanized services. It mainly includes: ① Recent user query service: analyzing the current coordinate position contained in the recent user query request of subordinate users, performing spatial analysis according to the location information of other users stored in the command node database, and sending the query results, including the latest user's card number, name, company, etc., to the service requesting user in the form of Beidou short message. ② Regional information service: analyze the current coordinate position and query data type contained in the regional information query request of subordinate users, obtain the early warning information, geological information and humanistic information of the query user's region according to the regional information stored in the command node database, and send them to the query user through Beidou SMS. Through this function, safety precautions can be achieved to a certain extent and safety accidents can be avoided. (3) Announcement inquiry service: users can keep abreast of the company's dynamics in a blind area without conventional mobile communication signals through announcement inquiry. ④ SMS forwarding service: Using Beidou-1 commander and SMS forwarding equipment, the SMS interactive communication between mobile phone and Bluetooth communication positioning terminal can be realized.

GSIGrid field geological survey management service and safety guarantee system Beidou information has the functions of real-time display on W eb client virtual three-dimensional earth, historical information query, route tracking simulation and so on. The functional design of the system is shown in Figure 6-28.

Figure 6-28 Functional Design of Management Service and Security System of GSIGRID Field Geological Survey

1) Real-time monitoring display module: This module mainly realizes real-time display of system monitoring information (Beidou positioning information, Beidou communication information and emergency alarm information). It mainly includes: ① Real-time display function of positioning information: the spatial position of subordinate equipment users is updated and displayed on the virtual three-dimensional earth at a certain frequency during the monitoring period. Monitoring time and refresh frequency can be customized by users according to their needs. ② Real-time monitoring function of communication information: During the monitoring period, the short message interaction information between users of subordinate devices is displayed on the W eb client in a conversational way. ③ Emergency alarm display function: analyze the alarm information sent by subordinate equipment users, display the user's control position on the virtual three-dimensional earth with special marks, and display the equipment card number, user name and company of the equipment user in the emergency alarm user list. And the system will automatically send rescue information to the security officer's mobile phone to ensure the timeliness of rescue. ④ Real-time route monitoring function of the day, the system will automatically simulate and form the running track of the day according to the positioning information of Beidou and the position information reported by SMS on the day, and dynamically display it on the virtual three-dimensional earth.

2) Information query module: This module mainly realizes conditional query and display of historical information of data storage. It mainly includes: ① personnel information query: the four-level directory management of region-province-unit-personnel can be used to display and query the latest location and personnel details of users in virtual three-dimensional earth positioning. ② Location information query: historical location information can be queried according to various conditions such as province, unit, personnel and card number, and the spatial location of the query structure and information of equipment users can be displayed by virtual three-dimensional earth positioning. ③ Communication information inquiry: historical communication information can be inquired according to various conditions such as province, unit, personnel and card number. The query results are classified according to the information type and displayed in the reverse list of communication time, as shown in Figure 6-29. ④ Simulation display of route trajectory: dynamically simulate and display the historical running trajectory of equipment users on the virtual three-dimensional earth (Figure 6-30).

3) Interactive communication module: This module mainly interacts with subordinate equipment users by means of Beidou instruction. It mainly includes: ① SMS interaction: sending SMS to subordinate users, and selecting one or more subordinate users at the same time. (2) Call location: actively obtain the location information of equipment users by means of instructions. ③ Broadcast function: Send short messages to all users who monitor subordinate equipment. Compared with sending short messages to multiple subordinate users, the advantage of this function is that it only takes up one time frequency of the commander, but the disadvantage is that only Beidou command card has this function, and it can only be realized at a certain level in multi-level management nodes, but not at multiple levels at the same time (Figure 6-3 1).

Figure 6-29 Information Query Interface

Figure 6-30 route trajectory simulation display interface

Figure 6-3 1 short message interactive communication interface

4) Basic tool module: This module mainly includes the basic functions of distance measurement, area measurement, driving path analysis, earth operation and so on.