Chapter 1 Railway industry background
1.1 Necessity for building a cluster intercom system
With the completion of the reform of my country's railway system, the development of my country's railway technology has been further improved, especially the development of high-speed rail technology has been significantly improved, my country's railway transportation speed has been further improved, and the railway operation cycle has been closer, which will bring huge challenges to railway work, because the improvement of railway transportation speed and shortening of operating cycles have led to the increase in the maintenance and maintenance workload of workers and the difficulty of work will also increase. Based on the experience and lessons learned from domestic and foreign work management, we can see that the traditional railway work management system and management methods can no longer meet the needs of the development of modern railway technology. For this reason, railway engineering management agencies and personnel must change traditional management methods and means, and use advanced management systems to achieve unified management of work information and scientific analysis and transmission of work information. All information unified management and analysis requires the help of modern computer technology. Therefore, in the context of the continuous development of railway technology, studying the information management system of railway engineering has important theoretical significance for realizing the construction of railway engineering information sharing.
1.2 Realization significance
Railway engineering is an important part of railway construction. Railway engineering work contains a lot of content. It is responsible for the safety of equipment along the railway and the inspection of railway infrastructure, and also for the maintenance and reporting of railway safety implicitly. Railway work directly affects the safe transportation of railways. If there is untimely maintenance in railway work, it will lead to safety accidents during the railway. At the same time, the expenses consumed by railway workers account for a large part of the entire railway operating cost, while railway maintenance accounts for almost half of the total railway construction cost. Therefore, in order to improve the safety of railway transportation and extend the service life of railway equipment, it is necessary to optimize the railway engineering management model, and use advanced system management technology to realize the information management of railway workers. Railway information management can scientifically analyze and judge the performance of railway engineering equipment, as well as scientifically predict and plan railway maintenance and maintenance, ensure the scientific and systematic railway work, avoid resource waste, reduce railway construction and operation costs, realize safe transportation of railways, and improve its economic benefits.
Chapter 2 Current status of the railway industry
2.1 Communication difficulties
There are many mountainous areas, tunnels, bridges, etc. along the railway, and there is difficulty in signal coverage. If there is an emergency, the staff cannot be quickly contacted by phone. The efficiency is low.
Rail accidents usually have no signs. Once it occurs, it will lead to chain accidents, which will cause strong destructiveness and serious damage to personnel. This puts high demands on the rapid response and resource coordination capabilities of rescue personnel.
2.3 Unity
The daily work of the railway department requires coordination with the public security, power supply, work, medical care, health and other aspects of joint dispatch. The existing analog signal intercom cannot achieve joint dispatch. In an emergency, when multiple departments need to cooperate, it is impossible to form unified call and command dispatch.
2.4 Instability
Undefined location, it is difficult to find nearby employees and quickly deal with the problem. Whether the personnel are on duty and patrol according to regulations is uncontrollable in management and there is no basis for assessment. In the event of an emergency, nearby employees cannot be quickly identified and notified to quickly rush to the scene.
2.5 Lack of real-time monitoring
For high-risk assets and areas, it cannot monitor real-time status and environment anytime, anywhere, and when an emergency occurs, it will cause major personnel and property losses due to the lack of real-time monitoring.
2.6 Poor communication confidentiality
With the progress of the times, the development of science and technology. Current simulated communication can obtain communication information through simple spectrum scanning, which leaves huge hidden dangers to the communications of various railway departments.
2.7 The multimedia data preservation system is missing.
. The daily work of various railway departments often require inspection, photography, video, text notes, recording notes and other multimedia data, but existing traditional equipment cannot realize this kind of function. Timely sharing, saving and uploading of multimedia data can greatly increase work efficiency and reduce the chance of accidents.
Chapter 3 Industry needs
The daily work of the railway department contains a lot of content. It is responsible for the safety of equipment along the railway and the inspection of railway infrastructure, and also responsible for the implicit maintenance and reporting of railway safety. If the work is not in timely maintenance, it will lead to safety accidents during the railway operation, causing personnel and property losses. In this context, the railway department has a growing demand for intercom communication systems. The existing frequency resources of traditional analog signals are very tight, frequency interference is becoming increasingly serious, and communication security means are lacking. Traditional analog systems have few functions and small data volumes, making it difficult to meet the daily work of today's railway departments. The
system has the following urgent needs to be solved on the premise of meeting the needs of the railway department:
3.1 Communication Requirements
3.1.1 Voice Communication
can provide efficient, convenient and rich voice call methods. The voice of the cluster intercom needs to be clear and accurate, comply with professional noise reduction design, and meet the voice intercom needs in noisy environments, including: single call, group call, emergency call, broadcast call, forced plug/demolition, dispatch station monitoring and other functions.
3.1.2 Video communication
When handling emergency cases, the on-site situation can be returned to the command center seat in real time in the form of a video stream or have video calls with the leader, so that the leader can view the video screen on the scene in real time, so as to make accurate command decisions based on the on-site situation, including: video single call, video group call, video pull-up of the dispatch station, video forwarding of the dispatch station and other functions.
3.1.3 Data communication
Data service is also an important means of wireless communication. When it is inconvenient to make voice calls, you can contact by sending text, or you can report status through predefined shortcut keys, including: text short messages, picture messages, video messages and other functions.
3.2 Management requirements
3.2.1 Command and dispatch management
In order to meet the application requirements of unified dispatching and command of various railway departments and a map of personnel, the command and dispatch platform should have the networking capabilities of horizontal interconnection, vertical multi-layer hierarchy, and management decentralization and domain-based networking, and have functions such as voice, video, data communication scheduling, map application, holding multimedia video conferences, voice conferences, communication naming, etc. In emergency events such as major mass incidents to maintain stability and natural disasters, the command and dispatch platform should be able to connect the communication systems of each department horizontally, realize the interconnection between terminals of different standards, conduct unified dispatch, respond to one call, force interruption of intercom for broadcasting, etc.
3.2.2 Patrol Management
The railway line is long, there are many stations, and the employees are widely distributed. If there is untimely maintenance in daily work, it will lead to safety accidents during the railway operation, causing personnel and property losses. In order to reduce accidents and ensure the safety of personnel and property, a complete and accurate patrol system with functions such as clock-in patrol, incident patrol, multimedia data upload and other functions
3.2.3 Positioning management
Due to the long railway line and wide distribution of employees, in case of an emergency, it is necessary to quickly locate nearby employees and notify them to rush to the scene. Therefore, a positioning system for accurate positioning, quick viewing, recording positioning, and recording trajectory information
.2.4 Multimedia management
Files generated during daily patrol, intercom, video, and file uploading and dispatching of railway employees. The system needs to record all voice, pictures, recordings and video calls that occur and store them in the backend server, so that the system can operate efficiently and stably under high pressure, making it easier to find and save files in the subsequent search and save them, and maintain the daily work of various railway departments.
3.3 Security and emergency accident requirements
3.3.1 Communication encryption
can freely choose end-to-end encryption method to protect the security of voice and video data. The function of business data always exists in the form of ciphertext during the transmission process from the source point to the end point is realized through software and hardware encryption.
3.3.2 System operation log
Intercom system needs to save operation records, including modifying user account, function, name, deleting group and other operations, so as to facilitate subsequent operators to query past operations, and to query deleted or modified information for unexpected operation errors.
3.3.3 members have one-click alarm
When an emergency occurs in a railway, members can notify all members through the one-click alarm function after discovering it, including the dispatching station operating users, forcing a warning to pop up and an alarm sound is issued.
Chapter 4 System Solution Overview
Intercom service is the most widely used communication scheduling tool in cluster communication. It generally needs to be implemented within a certain coverage through specially planned wireless communication frequency and dedicated intercom bearer tools, and has the characteristics of specialization and regionality. The SMART-PTT cluster system implemented by our company using various wireless access technologies (GPRS/CDMA 1x/EVDO/WCDMA/LTE/WiFi) reflects the difference from the above-mentioned traditional walkie-talkies, and can realize flexible intercom within a larger range of mobile communication network coverage, which is an extension and supplement to the functions of traditional cluster communication products.
SMART-PTT cluster system provides different types of solutions such as voice intercom, personnel positioning, video intercom, picture short messages, patrol attendance, etc. The management platform is a B/S architecture model, supports two login methods: web pages and APPs, and can create different access and operation permission accounts and perform flexible scheduling and management. It supports access to multiple network modes, realizes the integration of multiple terminals such as walkie-talkies, law enforcement instruments, mobile phones, cameras, and multiple terminals with computer terminals and platforms in multiple directions. It is suitable for multi-level visual command and dispatch system, and can meet daily and emergency command and dispatch needs at the same time.
SMMART-PTT cluster system is flexiblely deployed, has powerful functions, is safe and reliable, and is simple to operate. It can collect, upload and store a variety of data such as voice, video, positioning, user information in real time. It can query, playback, download and statistical analysis of data records on the platform, computer, device, etc., providing powerful data management support for command and dispatch and improving scheduling efficiency.
Chapter 5 Solution Features
l Just press and connect to
Press the intercom key to quickly initiate a call, and flexibly form "one-to-one" and "one-to-many" instant calls.
l One call 100 response
group members have large capacity, and intercom members in the group answer at the same time, improving the efficiency of command and dispatch.
l Cross-domain linkage
is not restricted by region and distance, and realizes remote real-time command and dispatch.
l Speech Management
realizes the forced insertion of speeches with permissions. Multi-level permissions are optional, and emergency instructions are given priority.
l has various functions
provides voice, images, video, positioning, patrol and other functions to meet the needs of different users.
l Simple networking
Relying on China Mobile Communications network, you only need to add a PTT server to implement the PTT cluster system.
l Secure encryption
platform can freely choose end-to-end encryption methods to protect the security of user voice and video data.
Chapter 6 Business Function Introduction
6.1 Intercom Service
Intercom Function is the most basic function of the SMART-PTT cluster system, including group call, single call, monitoring, broadcast, forced pull, remote kill, ban call, associated group, speech priority, SOS alarm and other usage methods. It can meet users' daily communication needs and emergency command and dispatch communication needs.
6.1.1 Fixed group call
After the user enters the fixed group, he can make calls to the users used in this group, and at the same time answer calls from users in the group.Users can join multiple groups and switch to different groups for group call.
6.1.2 Dynamic Group
Users initiate invitations to one or more online users and create dynamic groups to make calls;
When the user invites a user to create a dynamic group, a one-to-one single call intercom scenario is realized.
6.1.3 Listen
Select one or more groups on the dispatching platform for monitoring operations, and listen to the intercoms of these listened groups.
6.1.4 Speech Priority
There are 10 levels in speech priority. Level 10 is the highest speech level, and intercoms for users from level 1 to level 9 can be cut off. In different groups, users can set different speech levels. Finely manage users' speech permissions and improve command and dispatch efficiency.
6.1.5 Broadcast
Use the broadcast function, and all members of the group that users join can receive intercoms, which is suitable for issuing unified instructions and emergency commands. Broadcasting has the highest speech priority and is suitable for fast response and command and dispatch.
6.1.6 Group Broadcast
initiates group broadcast. As long as members of the current group are online, they can receive group broadcast speeches. Applicable to situations where command notifications are issued for all members of the group.
6.1.7 Associated Group
Communication needs to be conducted between multiple groups, and the group can be set as an association group. The selected group and its associated group can communicate with each other, and one group can establish associated groups with multiple other groups respectively.
can edit the established association group and set whether the group receives intercoms for the corresponding association group.
6.1.8 ban call
account cannot send intercom, you can receive intercom. Applicable to situations where a user is prohibited from speaking but allows him to listen to other users.
6.1.9 Invisible
Other users cannot see the user's existence, but they can hear the user's speech. It is suitable for situations where you cannot expose your identity and need to secretly listen to other users of the group speeches.
6.1.10 SOS alarm
SOS alarm information sent to group members is displayed on the map of the alarm user's location. When a user encounters an emergency and needs support, he can send SOS to the group members. Teammates can quickly provide assistance when receiving SOS requests.
6.1.11 Death
Forced the user to be offline and suspended on the dispatching station. When a group member performs operations that do not comply with the regulations, the administrator can force the member to be offline and suspend the user's use.
6.1.12 Set monitoring time
monitors the speech of group members. When the member does not perform any speech operations within the specified time, the dispatching station will alarm and issue a reminder message to the user, informing the user that he has not spoken for a long time.
6.1.13 The last group
When the user logs in again, he will enter the group where the last intercom is located, allowing the user to quickly enter the intercom state.
6.1.14 Force pull
Select a user in the group that is not currently in this group and let the user force back to the group.
6.1.15 Demolition
Select a user in the group and force the user to leave the current group to use.
6.1.16 Voice Call
Select a friend or user in the group to initiate a voice call to realize the real-time one-to-one call function.
6.2 Positioning Service
Positioning function is mainly used to view user positioning and trajectory. It can also set up electronic fences, route marking, ranging, circle selection and other operations, and can also customize user icons.
6.2.1 Positioning
View user positioning details, including user name, online status, positioning time, latitude and longitude, speed, direction and altitude. The location details of each member of the group can be viewed in the information list bar.
6.2.2 Track
View the user's running trajectory, you can select different time ranges to view the user's trajectory information, and you can export the user's trajectory.
6.2.3 tracks
monitors the location of a certain user from the current time and generates real-time motion trajectory.
6.2.4 Electronic fence
Plan a range on the map. An alarm can be set when the user enters or walks out of the fence.
6.2.5 circle select call
circle select to select users on the map to create temporary groups for intercom. Circle a range in the map interface and select users within this range to create a temporary group for intercom. Suitable for use when the personnel dispatching and command is required in combination with positioning.
6.2.6 Speeding Alarm
sets a limit speed for the user. When the user's movement speed exceeds the limit speed, an alarm prompt pops up on the computer dispatching desk.
6.2.7 Timeout Alarm
sets a residence time for the user. When the user stays in a certain position for a long time for more than the residence time, the dispatching station issues an alarm prompt.
6.2.8 Speaker of the Gather
Check the speaker of the Gather , the map will jump according to the speaker's location , and the speaker's location will be displayed in the center of the map.
6.2.9 KML
KML file is a geographic information file created by Google , which is used to describe and save track parameters such as time, location, latitude and longitude, and altitude. In the map interface, we can add KML URLs or open local edited KML files to import them into the map.
6.2.10 Three map types:
Users can choose Baidu Map, Gaode Map or Tianma to display user positioning or track information.
6.2.11 Location Mark
Draw punctuation points on the map interface, click on the location, enter the name and click confirm, and it can be displayed in the fence list, and the marking points can be deleted and displayed.
6.2.12 Line mark
Draw the line in the map interface, plan the line, enter the name and click confirm, it can be displayed in the fence list, and the line can be deleted and displayed.
6.2.13 Distance measurement
Select the positioning point on the map and measure the straight line distance between the positioning points.
6.3 Video service
Video functions include video calls, hands-free videos, video calls, video surveillance, video upload, video distribution, audio collection, picture upload, file upload, etc. The video call function supports one-to-one video calls, and video surveillance and video call support 32 channels simultaneously.
6.3.1 Video call
After selecting the user to initiate a video call, you can see the other party's image in real time and make a real-time call. During the video process, you can rotate the video screen, distribute the video, and share the video with members of the same group to watch; you can also switch between front and rear cameras and view different scenes.
6.3.2 Video hands-free
Select the user to create a video hands-free, and you don’t need to confirm by the other party, and you can directly create a video call.
6.3.3 Video call
When a video call is initiated on the user, the selected user will be forced to call the video function, the dispatching station will display the real-time video and voice information of the called user, and the user's mobile dispatching station interface will also display the video screen.
6.3.4 Video surveillance
performs video surveillance on the device, which can be implemented without the other party's consent. It can view the picture of the device in real time, but the device has no changes and does not know that it has been monitored by video. Video surveillance can support 32 channels at the same time. In video surveillance mode, you can hear group intercoms, while video surveillance users and establish video calls with other users.
6.3.5 Video distribution
Whether it is video calls, video hands-free, video calls and video surveillance, the other party's video screen can be distributed to other users, and video sharing can be established with other members to improve communication efficiency.
6.3.6 Video upload
Upload the live shot screen to the designated user or upload it directly to the server to save, recording and uploading.
6.3.7 file storage
file storage is used to view video, audio, pictures and other files saved on the machine. When the user does not have a network or is inconvenient to upload files, he can first record videos or take pictures, save them on the machine, and then upload them to the server when there is a network.
6.3.8 file upload
Upload video, audio, pictures and other files stored on the device to the server.
6.4 patrol service
patrol function is suitable for a variety of scenarios, such as work attendance, fixed-point patrol, equipment maintenance, etc. The establishment of electronic patrol system has made patrol security work more scientific and reasonable, and made security management more standardized, standardized and institutionalized. Managers set up patrol lines and set up patrol points on the patrol lines. Through the patrol management department, a defense network is formed in the patrol area, which further improves the work efficiency of patrols, reduces the work intensity of patrol personnel, saves manpower, and forms a comprehensive, multi-level, and high-efficiency patrol management system. There are two main ways to patrol
: ① NFC patrol ② Position patrol.
6.4.1NFC patrol
NFC patrol requires hardware support: ① Card with NFC function ② Patrol equipment with NFC function.
patrol personnel patrol according to the patrol plan set by the patrol system. After the patrol personnel arrive at the NFC patrol point, they use equipment to sense the NFC patrol point, select the on-site inspection event, record the on-site situation through pictures, videos, texts, etc. and upload it to the server, and send it to the administrator. Management dispatchers can use background software to combine historical inspection records to automatically analyze and count, and generate various reports to provide auxiliary decision-making for subsequent management.
6.4.2 Positioning and Patrol Update
Positioning and Patrol Update timely uploads inspection information and alarm information to the dispatch center through patrol personnel positioning. Ensure the timeliness of uploading inspection information in specific environments and special times. The management and dispatching desk can view the location and work status of patrol personnel in real time, greatly improving the system's real-time processing speed.
Chapter 7 Data convenience and security
7.1 Data storage
User recording, positioning, video, pictures, online recording and other data can be saved on the server and queried through the dispatching desk software or the management background. Users can also play recordings, videos and other records online. If the user needs to save it for a long time, he can download the record to locally save it, or directly select the save to local option when using it.
7.2 User status display
User status is divided into online, offline, pause, normal and other types. For online users, you can check whether the user is in this group, so that the dispatcher can better grasp the use of members and make timely adjustments and commands to members.
7.3 Call prompt
During the cluster call process, the user participating in the call can receive prompt information related to the cluster call status and inform the group members of the call status of other users of the group.
7.4 Send a short message
Send a text short message with a maximum of 120 characters to a single user or a certain group, or you can also send a picture message.
7.5 Disconnect and automatic reconnect
When the data network is disconnected for some reason, the software will detect whether the network is available. When the network is available, the software will re-dial connection.
7.6 Data Backup Recovery
system can back up and restore data such as users, groups and user logs. The data backup uses the SQL text format, which can realize cross-platform recovery and increase data security.
7.7 Data encryption
Voice data encryption uses two encryption methods: RSA/AES and SM2/SM4.
RSA/AES: Symmetric encryption AES, the encryption standard of the National Institute of Standards and Technology, its characteristics are: simple algorithms and fast encryption speed.
SM2/SM4: my country's independently designed grouping symmetric password algorithm is used to implement data encryption/decryption operations to ensure the confidentiality of data and information.
7.8 Dongle Login
In order to prevent the dispatching station's account password from being stolen or used by others, the administrator can log in to the computer dispatching station in the form of a dongle, that is, the administrator uses the dongle method to log in to the dispatching station. Even if others know the dispatching station's account password, the login will fail.
You can follow the official account: Zhuozhida Public Intercom Platform
