The Designe Of Position Searching Device Based On GPS And GSM Short Message

With increasingly close ties between the GSM network and GPS technology, , the short message service of GSM system quickly became a new channels of establish communication link and data transmission in the application of the GPS positioning system. In order to solve the problem that the recyclable products is difficult to find,the Position Searching Device Through GPS positioning and GSM base station location to get the exact latitude and longitude information and base station information, and then the information will be sent in the form of GSM short message .This paper describes the develop status and trends of domestic and international positioning first, and introduces the principle of GPS positioning and the theory of GSM base station location, and then gives the components and systems of work Mode of the positioning device based on two methods of GPS positioning and GSM base stations positioning.In this paper, there ie a detailed description of parts of the module of the hardware, Including the power module circuit, GPS module circuit, GSM module circuit and microcontroller control module. One of the GPS module for receiving GPS latitude and longitude information, GSM module to send short messages via AT commands and queries GSM base station location information, the control of two modules to achieve through the microcontroller serial communication. In addition, by the watchdog program, serial communication program, GPS data extraction procedures and the GSM short message sending procedures for the preparation of the positioning device to complete the overall design process, and then details the key part of the positioning device debugging, including the AT command port Communications testing, antenna testing, commissioning and overall function of the sand deep experiments.Protection against the problem of positioning device, the paper first choice and design from the chip up to consider, and then enhanced by pouring buffer protection measures and to achieve effective protection of products, and describes the process of protection issues that need attention, and finally a brief GSM base stations and the GPS information and information inquiry method.