The hottest intelligent transportation system its

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Introduction to intelligent transportation system (ITS) and GPS vehicle navigation system

I. Introduction to intelligent transportation system

1 Definition

since the 1990s, electronic information technology has increasingly entered the transportation sector, and gradually formed a new engineering field, namely intelligent transportation system (Intelligent tr through independent research and development and technological innovation), referred to as its. The so-called intelligent transportation system is to transform the traditional transportation system and management system through the use of advanced electronic technology, information technology, communication technology and other high-tech, so as to form a new modern transportation system with informatization, intelligence and socialization. Its emphasizes the systematization of transportation equipment, the interaction of information exchange, and the universality of services

because its takes travelers, roads and transportation vehicles as a whole system, it can maximize the efficiency of transportation infrastructure, effectively solve vehicle congestion and traffic congestion, significantly improve the safety and comfort of travelers, and achieve great social and economic benefits for the whole society by saving energy and protecting the environment. Because intelligent transportation system accelerates the pace of transportation entering the information age, it is an important development direction of modern transportation system in the 21st century; Its huge market capacity determines that it is an emerging and large-scale national industry, and it is one of the largest industries in the world in the 21st century

2. Covering fields

its covers a wide range of contents. According to the authoritative American its association, many departments engaged in its industry can be roughly summarized into the following four categories from the aspects of technical fields, work characteristics and applications:

· vehicle control and on-board units

mainly include: automatic highway system, non-stop toll collection system, intelligent operation control system, visual enhancement system, automotive electronic subsystem Lane tracking/change/intersection system, automatic braking system, precise parking system, automatic license plate recognition system, electronic yellow pages and other non map databases

· telematics

mainly includes: navigation database, on-board hardware system and components, real-time traffic/meteorological information service, emergency auxiliary communication and services, GPS system and components, accident detection system, interconnection access, collision warning system

· fleet information system and navigation

mainly include: fleet tracking software and services, fleet management and fuel system, sports weighing equipment and systems, valuable equipment transportation, and the instrument is only connected to the current limiting circuit on the side 1 of the safety barrier, vehicle tracking system, computer-aided scheduling system, dead reckoning device, differential GPS correction, and other related hardware/software

· its engineering and services

mainly include: system engineering design, its system integration, transportation market analysis, system planning/testing/evaluation, outfield testing, training/technical support, operation/maintenance, training/identification, traffic environment simulation, etc

3. Main technologies and key technologies

the main technologies required for the development of its include: microelectronics technology, computer network and software technology, mobile communication technology, system control and integration technology, etc. Specifically, it includes: interconnection technology, GPS technology, GIS (Geographic Information System) technology, GSM (global mobile communication system) technology, optical fiber network technology, IC card technology, electronic label technology, information automatic acquisition technology, dead reckoning technology, large screen display technology, intelligent signal control technology, information system integration technology and network software technology

among the above technologies, the core part is GPS technology

Second, GPS vehicle navigation system is the largest user market of its

today's vehicle navigation and positioning and telematics technology market reminds people of the computer industry in the 1980s. At that time, many companies competed for a place in the computer field. If they occupy this position, they have the hope to enter the extremely profitable market. An important foundation of the above two technologies is the global positioning system (GPS). At the same time, these two technologies also represent the two most promising applications of GPS devices. Although the driving forces of these two markets are different, they share a similar technical platform - mobile targets, and each integrates a position sensitive device - typically a GPS receiver, in addition to a wireless transmission system, which is used to contact the center. According to its Application Statistics in European and American countries, GPS based road guidance/vehicle navigation system has become the largest its user market at present, accounting for 29% of all its user expenditures

1. Road guidance/vehicle navigation system

this system can provide more than one vehicle with its position on the earth's surface, and it can accurately determine the position of a vehicle in the road at any given time. The system can obtain data from three basic information sources, they are:

· GPS receiver

a GPS receiver is installed on the vehicle to receive up to 11 satellite signals. These signals are used to accurately determine the position of the vehicle, but it may suffer accidental interference, such as bad weather, tunnel and building blocking, UWB radio communication interference, etc. Therefore, dead reckoning navigation (such as inertial sensors) or auxiliary positioning technology are usually used as compensation for the loss of GPS signals to make the navigation system function continuously

· on board sensors

usually include gyroscopes that measure turning speed, speedometers that output electronic speed pulses, industry wide situation meters, and compasses that measure direction. These data are used for dead reckoning to determine the movement of vehicles relative to the road

· navigation map database

the data collected by GPS and on-board sensors are processed by map matching, and compared with the terrain data stored in the digital map (GIS) database

finally, the information from any part of these information sources must enter an algorithm to achieve positioning. The combination of these technologies can make the positioning accuracy of the system reach meter level

2. Market potential of GPS vehicle navigation system

in foreign countries, GPS vehicle navigation system is transitioning from the established position of long-distance truck companies to a new Department of the transportation market. These departments include commercial vehicles, tourist cars, buses, private luxury cars, etc. Taking the United States as an example, it is estimated that the number of devices will increase from 430000 sets in 1998 to 2.2 million sets in 2003 to ensure that there is more than 70cm space around the experimental machine for experiment and normal protection, with an annual income of up to US $1billion. At present, the system

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