- System Overview -
The rapid development of the national economy has accelerated the process of urbanization, and urban public transportation is facing enormous pressure. Urban rail transit, a safe, comfortable, fast, punctual, and environmentally friendly transportation tool with large capacity, is rapidly developing. With the rise of internet cloud computing and the upgrading of mobile communication technology, passengers' demand for information is becoming more diversified, and mobile interconnection will shorten the distance between trains and the ground, Deep train ground interconnection and interoperability have become an inevitable trend, and the Passenger Information System (PIS) will become a complete system solution covering ground centers, stations, depots (parking lots), and on-board equipment.
- On board passenger information system -
The onboard passenger information system (PIS) is the onboard part of the overall solution for urban rail transit passenger information system (PIS). On board PIS is a set of on-board system equipment that provides passengers with various information services. It can provide real-time and dynamic multimedia information such as travel instructions, service time, train arrival and departure time, train timetable, government announcement, travel reference, etc., and provide dynamic Emergency evacuation tips in abnormal situations such as fire, congestion and terrorist attacks.
With the development of electronic information technology and network communication technology, in vehicle PIS has evolved from a traditional analog platform solution based on bus control and analog audio and video transmission to a fully digital solution based on a combination of gigabit Ethernet communication, digital audio, and multimedia technology.
The fully digital in vehicle PIS is based on gigabit Ethernet communication technology, which integrates the three subsystems of traditional in vehicle PIS and integrates Ethernet switches inside the system host. Functionally, the concept of subsystems is weakened, and the equipment in the system is divided into host devices, operation terminals, multimedia terminals, video acquisition terminals, and text display terminals. The main features of the fully digital on-board PIS system are as follows:
• Bus Link aggregation (IEEE 802.3ad): extended bandwidth, load balancing, system fault tolerance
• POE power supply (IEEE 802.3 af/at): Simplify wiring and save costs
• Dynamic Host Configuration Protocol (DHCP): Automatic IP address assignment of terminal equipment
• Digital audio and video technology: AGC, H.265, Onvif, NVR
• Integrated host: broadcasting, media, monitoring, and switch in one
• Industrial grade ARM processors: embedded, low power consumption, high reliability
• European standard chassis specification (IEEE 1101): 3U, 19 inch, modular
Driver's cab host: Passenger Information System Controller (PISC)
Passenger compartment host: Passenger compartment communication controller (CCU)
The PISC/CCU adopts a 19 inch 3U European standard chassis, with unified planning for the two products, integrating broadcasting, media, monitoring, and switches. The internal units of the product adopt modular design, considering unit reusability, and achieve different product functions by configuring different backboards and units:
• Processor: iMX6Q CORTEX-A9 quad core 1GHZ
• Memory: DDR3 SDRAM 4Gb
• System storage: eMMC4GB
• Application storage: SSD 1T
• Communication interface: 1000MbpsEthernet, 100MbpsEthernet, MVB
Intelligent operation terminal
The Passenger Information System Operation Screen (PISM) integrates functions such as broadcast control, media control, and video monitoring display, and is an operating terminal for controlling and setting digital on-board PIS. This device is installed on the control consoles in the driver's cabs at both ends of the train. Through PISM touch operation, functions such as driver communication and intercom, broadcasting station announcements, monitoring queries, etc. can be achieved. At the same time, the PISM display interface can display the current operation status, monitoring images, related operations, and system equipment operation status of the train. PISM adopts a 12 or 14 inch intelligent touch display.
The multimedia terminal includes a passenger information display (TGS) and a passenger compartment media television (LCD). Among them, TGS is used for map and media information display, while LCD is used for operation and media information display and integrates passenger emergency alarm function.
Video capture terminal
All video capture terminals use network IP cameras for train rear view images, driving records, cab and passenger compartment cameras, and support infrared day and night mode.
Camera in the driver's cab
Passenger compartment camera
Train rear view image
Text display terminal
The text display terminal adopts an LED dot matrix display, supporting three types of dot matrices: 5mm, 3mm, and 2.5mm. It has single and dual color display capabilities and can be controlled and upgraded through an Ethernet interface.