The GR47 module-based vehicle positioning monitoring system introduced in this paper is a set of remote monitoring and management developed by using the world's leading GPS global satellite positioning technology, GSM/GPRS global mobile communication technology, GIS geographic information processing technology and data processing technology. system. The system can remotely monitor and schedule all mobile targets such as police vehicles, emergency vehicles, fire-fighting vehicles, rental vehicles, rental vehicles, and civilian vehicles within the coverage of the GPRS+GSM network. The GPS data of the moving target, other commands and various types of alarm data are transmitted from the GPRS channel to the remote data processing center, and voice calls can be made as needed.
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First, the features of GR47
The GR47 is configurable, which makes the external control applications provided by the external input and output interfaces more efficient. The embedded controller is accessible in group applications such as alarms, meter acquisition and application announcements, and supports C programming. The unique advantage of GR47 is that it transmits a large amount of data and keeps the connection at all times. According to our tests in different regions, the probability of dropped calls is the smallest of its kind; it has the function of TCP/IP protocol stack, and can also open internal CPU resources and have All the necessary features for M2M communication.
The figure shows the GR47 internal real-time operating system (RTOS) and external hardware interface block diagram. The controller is located inside the GR47 and runs the real-time operating system. The RTOS provides users with GSM processing procedures, AT command channel functions, TCP/IP protocols, UART, I/O ports, I2C, SPI bus and other external interface driver functions and some other application functions. The microcontroller runs in the background, so it does not affect the GSM functionality of the module. The user downloads the application as a script to the module's FLASH. The module uses an interpreter that reads the script from FLASH and interprets it line by line. Make it perform the required functions. There are 3 serial ports on the outside of GR47, among which serial port 1 is used for AT command channel or program download, serial port 2 is mainly used for debugging program, serial port 3 is universal 232 port, can be connected to other external devices, and there are also I2C, SPI bus and 8 Root I/O line.
The GR47 module has two working modes. One is the internal controller mode, that is, directly using the embedded CPU and open system resources, downloading the application to the module, and the script runs in the internal controller of the module itself. When the script is running, the module can send and receive data and process it. The other way is the external controller mode, that is, the module is embedded in the user's system, the external processor controls the operation, and the script is externally controlled. Running in the device. A typical application is to combine a microcontroller with the GR47 module and send an AT command from the microprocessor to the GR47 via UART1.
Second, the system design
The whole system consists of GPS global positioning system, mobile terminal, GSM/GPRS network and remote monitoring center: GPS global positioning system is mainly used to receive satellite positioning signals and calculate the current geographical position of the vehicle-mounted device; wireless communication system adopts GPRS mobile communication system is mainly used for real-time uploading information such as longitude, latitude, speed, movement direction, time, vehicle status and alarm of the mobile vehicle encoded by the communication control device of the mobile terminal to the monitoring center, and moving the monitoring center to the mobile center The control command of the terminal is sent to the mobile terminal; the monitoring workstation performs appropriate data processing on the received vehicle position and status information, and displays the position of the vehicle and its trajectory on the electronic map, thereby achieving real-time monitoring of the moving vehicle. . At the same time, the monitoring center can also send instructions to the mobile terminal to implement scheduling management of the vehicle. The mobile terminal in this design is the core of the vehicle positioning monitoring system, and is mainly composed of a GPS receiving unit, a GPRS communication unit, a main controller unit, a human-computer interaction unit composed of a Chinese liquid crystal display and a keyboard, and a telephone handle.
1. GPRS communication unit and main control unit
GR47 has GSM/GPRS full voice and data functions, integrates powerful CPU and opens its system resources to users. At the same time, the module has built-in TCP/IP protocol stack and real-time operating system, which can collect GPRS communication and main vehicle. The controller functions in one. In this design, the GR47 module works in the internal controller mode, and the controller is used to coordinate the work of each module in the mobile terminal and perform necessary data processing. At the same time, GR47 has two wireless data transmission channels, GPRS and SMS. In the case that the GPRS network is in good condition, the information such as the location, speed, and car number of the vehicle is transmitted to the monitoring center through GPRS communication, and the command from the monitoring center is received. At the same time, the GR47 continuously checks the status of the GPRS network. When there is network congestion, GPRS is not covered, or the TCP/IP connection is disconnected due to the misoperation of the central staff, it will immediately switch to the SMS mode until the TCR/IP re-establishes the connection.
2. GPS receiving unit
The GPS-OEM board is the main component of the GPS receiving unit. It receives the positioning signal from the GPS satellite through the antenna, and through a series of processing procedures such as frequency conversion, amplification and filtering, it can track, lock and measure the GPS satellite signal and generate the calculation position. The data information (including latitude, longitude, altitude, speed, date, time, heading, satellite status, etc.) communicates with GR47 through standard RS232 serial port, GR47 cyclically receives the positioning information sent by GPS-OEM board, and is extracted after calculation. Data information of interest to the user (such as latitude, longitude, altitude, speed, date, time, etc.), plus a packet header to form a data packet to be sent to the monitoring center via the wireless channel.
3. Human-computer interaction unit
The GR47 module itself provides 4 row lines and 4 column lines. It requires only a few peripheral circuits to implement a 4×5 keyboard, and a keyboard scan function is provided in the development kit. The software implementation is also quite convenient. After the embedded application scripting language is used, the keyboard interface and the I2C interface on the module can be directly used, and a simple human-machine interface can be provided without an external controller.
The display mainly displays the control information and text information sent by the monitoring center on the LCD screen. In this design, the I2C interface of the GR47 module is used, and the LCD module of the parallel port control is controlled by the I2C to parallel port chip PCF837GA. As shown in FIG. When the script is running, the output of the GPIO chip is set by writing I2C data. The output of the GPIO is connected to the data and control lines of the LCD module. The high-speed I2C data output allows us to create a set of discrete waveforms up to 8 bits to meet the LCD interface requirements.
4. Telephone handle unit
The telephone unit in this design can communicate with the monitoring center through software settings, and can also make and receive calls by any means. The GR47 module provides a voice signal line, and the designer only needs to perform amplification and filtering to obtain a voice signal with good sound quality.
Third, the conclusion
The system makes full use of the GR47's A/D conversion, UART, I2C and other functions, so the structure is compact, whether it is software or hardware development is very convenient, improve development efficiency, reduce costs, and greatly enhance product features. .
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