Tracker composition

Common receiving chip

( 1).sirf starⅱe:

Sirfstar Ⅱ E is the first high-performance GPS chip, which was released in 2002. Sirfstar Ⅱ E/LP (GSW 2.3) is a low-power version of Sirfstar Ⅱ E. Both of them use a correlator of 1920 times/frequency, and the cold start/warm start/warm start time reaches 45s/35s/8s respectively, which can track 12 satellite channels at the same time. It should be said that the indicators of these two chips can meet the daily application requirements, and these two chips have been widely used in dependent GPS products launched in 2003-2004.

Commonly used GPS receiving chip

(2).SiRFstar:

In 2004, SiRF chip released the latest third-generation chip SIRF STAR III (GSW 3.0/3.1), which made the performance of civil GPS chip reach a peak, and the sensitivity was greatly improved compared with previous products. The sensitivity of the chip is improved by using a correlator with a frequency of 200,000. The cold start/warm start/hot start time is 42s/38s/8s respectively, which can track 20 satellite channels at the same time. Many of the latest dependent GPS receivers introduced in 2005 adopted this chip.

(3). sonysinglechipsolutioncxd 295 1:

Sony's third-generation chips are only packaged in RF and baseband, and the sensitivity is-152dBm.

2.GSM/CDMA launch part

GSM module integrates GSM RF chip, baseband processing chip, memory and power amplifier on a circuit board, and has independent operating system, GSM RF processing, baseband processing and functional modules providing standard interfaces.

Developers use ARM or MCU to communicate with GSM module through RS232 serial port, and use standard AT commands to control GSM module to realize various wireless communication functions, such as sending short messages, making phone calls, accessing the Internet through GPRS, etc. Product development based on GSM module is often based on ARM platform and embedded system. Some GSM modules have? Open built-in platform? Function, which allows customers to embed their own programs into the software platform in the module.

The earliest manufacturers of GSM modules are mainly in foreign countries, including Siemens, Wavcom, Sagem, etc. With the domestic technological progress, domestic manufacturers such as Huawei, Simcom, BenQ and other modules have gradually replaced the mainstream position of foreign brands in the domestic market because of their higher cost performance. The popular modules in the market are GTM900-B[ 1] of Huawei, Mc39i of Siemens, Q24 of Wavecom, etc.

3. Receiving platform part

The network operator (Unicom or Mobile) will open a service port (about 6000- 10000) for you, and then build your own website. The system generally adopts B/S (Browser/Server) structure, and there is no need to build any system or install any software. As long as the computer can access the internet, it can realize the rapid and accurate scheduling management of enterprises.

The query operation is as follows: enter the website system interface, select GoogleEarth query at the top of the interface, and the system will start to query the number in real time, and display the query results on this page. Users can click on GoogleEarth to view the actual location of the vehicle through the satellite map provided by GoogleEarth. If you want to do positioning, you need the following conditions:

(1) There are many brands of general GPS receiving equipment, ranging from 600 to 2000 (responsible for receiving satellite signals);

(2) Network platform (showing the position of the person or thing you want to observe);

(3) the support of network operators (the information of network platform is transmitted and reflected through the base station of network operators);

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