Application of GSM communication in water level remote detection system
Abstract: This paper introduces a water level display and remote detection system composed of single chip microcomputer and GsM wireless transceiver module. The system designs a simple water level detection method to measure the water level, which is displayed by LED on the water level field through the single chip microcomputer display system, and the water level information is wirelessly sent to the remote terminal through the GSM module connected with it, which plays the role of detection.
Keywords: GSM GSl00 serial communication remote detection S9C205 1
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The water tower and high-level pool in the water supply system are very inconvenient to get up and down because of their high terrain, and sometimes they don't know that the water is running out, which leads to the situation that there is no water available when water is needed. In addition, in the process of filling water into the pool, because the water level is unknown, it is impossible to control the water injection quantity, which will seriously affect the normal work efficiency. Therefore, it is necessary to automatically display, monitor and alarm the water level. The traditional water level detection system is generally connected with the monitoring center by wired way, which is not only difficult to maintain, but also limits its expansion in time and space to a great extent. The system composed of GSM module and single chip microcomputer can solve the above problems. The display function of water level can be conveniently realized through the parallel I/O port of single chip microcomputer. The existing GSM network has realized nationwide network roaming and has the characteristics of strong network capability. Users don't need to set up another network, which greatly improves the network coverage and saves expensive network construction and maintenance costs for customers. When using GSM module, remote terminal monitoring and alarm functions can be realized by wireless communication.
Realization of telephone interconnection between trunking communication system and GSM communication system
Overview system and communication system belong to different categories, have different service objects and uses, and cannot replace each other. Trunking communication system serves private network users and has developed into an advanced mobile communication system with multi-purpose, high efficiency, low investment, dispatching communication and telephone communication. Compared with other mobile communication systems, trunking communication system has high channel utilization rate and strong ability to quickly access and deal with emergencies, and has been widely used in military, public security, transportation, water conservancy, earthquake and other departments. GSM communication system mainly serves public network users. It is a mature, perfect and widely used mobile communication system based on time division multiple access technology, with wide signal coverage and users all over the society. In the emergency mobile communication system constructed by trunking communication system, in some applications, such as emergency rescue and disaster relief, it is sometimes more important to ensure the smooth communication between the system and the outside world than to ensure the smooth communication within the system because many departments and personnel are involved. Just as the interconnection between trunking communication system and PSTN telephone makes private network communication extend to public wired communication network, the interconnection between trunking communication system and GSM communication system can make private network communication extend to public wireless communication network, thus making full use of the technical advantages of GSM communication system and greatly enhancing the emergency communication capability of trunking communication system.
Based on the above application background, this paper studies the telephone interconnection between trunking communication system and GSM communication system, puts forward a practical system telephone interconnection scheme, and expounds the specific software and hardware design process.
Application of GSM network communication in vehicle positioning system
GSM (Global System for Mobile Communications) is a European cellular mobile communication standard formulated by ETSI (European Radio Communication Standards Committee). The most important service of GSM is voice communication, which is digitally encoded and transmitted by GSM network as a data stream by circuit switching. However, the maximum transmission rate of the circuit-switched channel it uses in the air interface is 14.4kbit/s, so GSM is limited.
GPRS is the main development of packet switching technology based on GSM standard, which provides wireless users with much higher transmission rate to meet explosive data transmission requirements. Theoretically, GPRS users can use several time slots (packet data channel) at the same time to achieve the highest transmission rate of170 kbit/s. Since the channel is allocated to users when sending or receiving data packets, it can be charged according to the flow. A large number of data services effectively balance the network resources between users, because service providers can use transmission time slots for other user activities. General Packet Radio Service (GPRS), as a data extension of GSM, a mobile phone standard, is being regarded as the first real packet switching structure, which enables mobile users to benefit from high-speed data transmission rate and complete various data service applications through their mobile terminals. GPRS services are divided into PTP (point-to-point) and PTM (point-to-multipoint) services.
Global Positioning System (GPS) is a new generation of inter-satellite radio navigation system, which was put into full operation at 1993 1000 billion dollars after more than 20 years of experimental research by the US Department of Defense. Its appearance and development gave birth to an emerging market with great potential and increasingly fierce competition. According to the latest statistics, there are currently more than 4 million GPS users in the world, and the market for related products and services is expanding rapidly. Global positioning system has developed into an important industry.
With the development of automobile industry and intelligent traffic management, vehicle-mounted GPS navigation and positioning will become one of the biggest potential markets for global satellite positioning system applications. As far as China's national conditions are concerned, vehicle-mounted GPS navigation and positioning has broad market prospects in the fields of special vehicle dispatching and monitoring, intelligent public transport management, taxi operation management and so on. Communication subsystem is one of the key subsystems of vehicle GPS navigation and positioning. In the past, the communication subsystem was realized by radio and other related means, which had some problems such as tight frequency resources and small coverage.