The perception layer is mainly responsible for the identification of objects and the collection of information; the network layer is responsible for the network access and information transmission of various devices; the platform layer is responsible for the analysis, processing and decision-making of information, as well as the realization or completion of specific intelligent application and service tasks, so as to realize the identification and perception between objects and people and play an intelligent role.
1.1 Perceptual Level
As the name suggests, the perception layer is used to sense and perceive basic things. It takes the Internet of things as the core, through the technology of Internet of things, marks the goods, and intelligently collects the information of the goods, mainly including the basic components such as reader, tag, sensor, camera, barcode two-dimensional code label and reader. It also includes the network that integrates these components, such as read-write network, sensor network, etc.
The IOT sensing layer of smart cities mainly provides the intelligent sensing ability to the environment. With IOT technology as the core, it realizes the identification, information collection, monitoring and control of infrastructure, environment, building, security and other aspects within the city through chips, sensors, RFID, cameras, and other means. The main technologies are:
RFID system usually consists of electronic tag and reader. There is a certain grid of electronic data in the electronic label to identify the object information, which is one of the key technologies to replace bar code into the era of Internet of things in the next few years. The technology has some advantages: it can be easily embedded or attached, and track and locate the attached objects; it has a longer reading distance and a shorter access time; the data access of tags has password protection and higher security.
This technology obtains information from natural sources, process (transform) and identify it. Sensors are responsible for information interaction between things and people in the Internet of things. As a new information acquisition and processing technology, sensor technology uses compression, recognition, fusion, reconstruction and other methods to process information, so as to meet the needs of diverse applications of wireless multimedia sensor network.
This technology is application-oriented, based on computer technology. Software and hardware can be tailored to be suitable for special computer system with strict requirements for function, reliability, cost, volume, and power consumption. It is generally composed of embedded microprocessor, peripheral hardware device, embedded operating system, and user's application program. It is used to control, monitor or manage other devices.