Abstract : The hardware composition and GIS software development of vehicle navigation in vehicle remote terminal instrument are discussed. The circuit diagram of the Renesas Electronics SH7764 microprocessor is given, and the architecture and data management of the embedded electronic map are discussed. It also introduces the process of secondary integration development under MapXMobile. This system has been running on the experimental vehicle of Shanghai Pan Asia Automotive Technology Co., Ltd. for two years. It has proved that the system is reliable and can meet the basic needs of production. The main function of the vehicle remote diagnostics is navigation. The navigation function focuses on driving route design, automatic vehicle positioning, integrated information service, and route guidance service. The navigation function is a comprehensive application system combining GIS technology, communication technology, embedded technology and GPS positioning technology. Through the GPS positioning all-weather, high-precision and real-time characteristics, the system can accurately and real-time tracking the vehicle. By applying GLS technology, the positioning information of the vehicle can be displayed on the electronic map to clarify the exact location of the user. Based on the introduction of the typical software and hardware components of the navigation system, this paper focuses on the design and implementation of the car navigation electronic map, which has practical significance for the further optimization of car navigation. 1 Car navigation electronic map architecture 1.1 system hardware design When the embedded system is used as the carrier of the electronic map, the hardware system needs to adopt a 32-bit microprocessor and the working frequency is above 400 HMz, so that it can process a large amount of data and smoothly run the operating system. The hardware system needs to be able to support multimedia functions, support LCD touch screen input, and load function with large capacity SD card. The selected operating system should have the management function of information database and map database. As the core processor of the diagnostic instrument, the SH7764 has a maximum operating frequency of 324MHz and can achieve 583MI/S processing performance. The FPU supports single and double precision operations and achieves the highest performance of 2.3GFLOPS. And has a wealth of hardware resources, including hardware audio decoding, Zheng Xuan / Yu Xuan operation and vector meta-operation functions. Peripheral execution memory functions include NAND flash controller and memory card controller, Ethernet controller (10/100BASE-T), USB interface (full speed/high speed), I2C bus interface, serial communication interface with FIFO, display Support functions are provided by the 2D graphics engine, LCD controller and digital RGB output. The high-speed data processing performance and rich peripheral functions of the SH7764 make the SH7764 processor a high-performance on-board diagnostic processing system at a low cost. When using the SH7764 to form a vehicle remote diagnostic instrument, the circuit block diagram is shown in Figure 1. 1.2 Operating system WinCE operating system is a powerful, tailorable, and portable system, and has the storage and management functions of the user information database and digital map database necessary for the system. In the WinCE operating system, the virtual private network (VPN) has strong operability and applicability. It mainly uses the public network as the media for user information transmission, through additional tunnel encapsulation, information encryption, user authentication and Technologies such as access control implement security protection for the information transmission process, thereby providing users with security performance similar to a private network. Relatively speaking, the security is greatly improved. Therefore, such a network information security system generally adopts a complicated password authentication mechanism to ensure the security of the system account. The system uses strict rights management to ensure the security of the system operation. (1) Network operating system layer: Through the management mechanism of network and operating system and corresponding management software and firewall technology, prevent viruses and hackers from invading the information management network of enterprises, encrypting important data and transmitted data to prevent Illegal personnel log in to the database and application system to ensure the smooth operation of various businesses in the network environment. (2) Database system layer: Through the database operating system ORACLE and other management mechanisms and corresponding management software, the verification of the login database users, the control of various operational rights of data, the timely backup of data and the management of historical data. (3) System application layer: mainly the management function test provided by the system platform, with function permission setting, data permission setting, time permission setting, application control mechanism and operation log management. 1.3 GIS software design The design of GIS software is based on the definition of data structure and database structure, which directly determines the stability, rationality, functional integrity and scalability of the system. The query retrieval function, image function, and analysis function of the GIS software are developed in turn. A carbon oven is a kind of barbecue equipment using charcoal as fuel. From the baking pan, carbon bucket, oil tank, base composition, barbecue need to prepare the oven, charcoal, solid alcohol, igniter. Carbon Oven - a kind of barbecue equipment made of charcoal as raw material for smokeless barbecue. It is the most widely used oven in carbon oven. Mainly used for garden dinners, outdoor picnic. Charcoal BBQ Grill,Smokeless Charcoal BBQ Grill,Outdoor Charcoal BBQ Grill,Portable Barbeque Grill Ningbo APG Machine(appliance)Co.,Ltd , http://www.apgelectrical.com
Figure 1 Circuit block diagram of the vehicle remote diagnostic instrument using the SH7764
Advantages: easy to carry, clean and sanitary
Disadvantages: one can only meet four to six people, need two or more difficult to meet a big party to use.
Practical number: 4 ~ 6 people
Floor-type carbon oven, usually on the desktop or mat above the practical. Popular in Korea and Japan and Europe and the United States, will be in some courtyard party, family dinner and outdoor travel to see the equipment to the figure, very easy to carry and clean health by the outdoor family favorite. Such as in the outdoor want to eat clean and healthy food is really difficult, if brought a carbon oven basically what are resolved. Desk-type carbon oven, this looks like a table, there are four feet. Is a very common carbon oven, the street is very much.
Advantages: You can do a lot of food at the same time to meet user needs.
Disadvantages: too large, inconvenient to carry and health problems
Number of users: should be determined