The centralized procurement layer is mainly composed of GPS mobile terminals, which complete the collection of front-end data in the system. It mainly consists of CPU+GSM+GPRS+GPS functional modules. Complete data collection and transmission. The terminal collects various sensor data and peripheral data, and then transmits them to the remote server through GPRS. The core part of the entire system is the GPS module. GPS determines the positioning accuracy and reliability of the entire system. The price difference between a good module and a regular module is 1-3 times. The two largest GPS manufacturers in the world are Sirf in the United States and Sublox in Switzerland. Sirf mainly produces chips, and there are usually many third-party modules based on Sirf chips. The module parameters also vary depending on different technologies and processes. Another giant is Switzerland's UBLOX, a rapidly developing full solution company. Since purchasing the core of ATmel, it has launched many standalone solutions, which are favored by many domestic mobile phone manufacturers due to their high precision and integration, such as Huawei K3 solution and Meizu solution. UBLOX not only produces its own chips, but also a full range of internationally certified GPS modules and communication modules. Due to its high stability, many industrial control industries and vehicle navigation solutions in China use the UBLOX module. Solutions that use the UBLOX module are also more easily certified in industry standards. The mainstream GPS solutions in China include MTK, Philips, Japan JRC, sirf, ublox, etc. The prices also increase in sequence, and the differences in prices also reflect the differences in performance

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