Research on GPS-Beidou satellite positioning System "technology-independent"

Objective

Land transportation is the largest application field of GPS satellite positioning system, since the implementation of the satellite positioning system in 08, our province has played a prominent role in vehicle monitoring and dispatching: the main functions include vehicle tracking, route planning and navigation, information inquiry, Traffic command, emergency assistance, etc. It can be said that the satellite positioning system has become the transportation industry management indispensable an important tool.

However, in taking full advantage of the benefits of GPs, we must also face the congenital shortcomings of GPS system: The current GPS Global Positioning system is the United States and the the 1970s development of the space satellite navigation positioning System, its main purpose is to land, sea and air three areas to provide real-time, Round-the-clock and global navigation services. Too much reliance on GPS system will also make our country in the construction of important projects in a more passive position.

According to the Ministry of Transport documents: nine provinces and cities nationwide "two passenger and one dangerous" vehicles need to update the vehicle terminal should be installed Beidou compatible car terminal; All new heavy duty trucks and semi-trailer tractors entering the transport market should be equipped with Beidou compatible vehicle terminals and access to the public supervision and service platform of road freight vehicles. To the end of 2012, 9 provinces and cities nationwide 100,000 vehicles have been installed Beidou satellite navigation device, 80% or more before the end of March installed Beidou car terminal. It can be seen that the use of Beidou system to replace the existing GPS system has become a major trend in the transportation industry. The following is a brief introduction to the existing GPS system characteristics, Beidou system characteristics and the use of Beidou system to replace the existing GPS system problems.

Existing satellite positioning System

Dragon GPS System

The province's road transportation industry GPS Security Management Service system consists of a provincial platform, 11 city-level platforms, several enterprise platforms. Provincial and municipal level two platforms are located in the provincial Transport Authority and the municipal Transportation and management office respectively. Provincial, municipal and enterprise level three platform accountability. With dispatching, alarm, electronic fence, data storage and other functions.

The existing GPS system in the provinces in the province gradually opened in 2006, the system relies on GSM network, the use of GPRS data flow and GPS platform for data communication. In addition to providing real-time location information for the monitoring platform, the in-car camera can be returned to the monitoring platform via a photo. In addition to provincial, municipal and enterprise level three management platform, but also includes installed in tourism, class line, dangerous goods vehicles on the GPS receiving terminal equipment . Terminal equipment mainly includes the following modules:

1. The positioning module is responsible for GPS satellite positioning;
2. Responsible for the data communication module with management platform;
3. Responsible for the vehicle operation information Monitoring, control module.

Beidou navigation System

In recent years, with China's efforts in satellite navigation, as of December 25, 2011, China's Beidou system has launched 16 satellites, built a basic system covering China and neighboring countries, December 27 China's autonomous construction, independent operation of the Beidou satellite navigation system to start regional official services. The Beidou navigation System (BDS) is a self-developed, independently-operated global satellite navigation system that is being implemented in China. The goal of the system is: to form an independent, open and compatible, technologically advanced, stable and reliable global Beidou satellite navigation system, promote the formation of the satellite navigation industry chain, the formation of a sound national satellite navigation application industry support, promotion and security system, promote satellite navigation in the national economy and social industry wide application.

Implementation plan

According to the existing system usage in Shanxi Province, the GPS system can be transferred to the Beidou navigation system with the following options:

1. Use the vehicle Beidou navigation terminal to replace the existing passenger and freight vehicle GPS receiving terminal, and make some modifications to the existing system to make it compatible with the new terminal;
2. Upgrade the existing GPS monitoring platform, add or modify some of the functions to make it more consistent with the needs of the business regulatory Department;
3. The development of a new system suitable for Beidou system, completely replace the current GPS monitoring platform;

Scenario Analysis

Programme one:

Advantages: Considering the compatibility with the existing GPS system, data sharing and other issues, switching to the Beidou system should not affect the existing provincial platform network use, the adoption of a plan to receive GPS signal receiving terminal changes to the Beidou navigation terminal, is the most convenient method. Because only accept the satellite positioning signal equipment replacement, the vehicle terminal back to the monitoring platform content can be unchanged, so that the entire monitoring platform does not need to make any changes.

Disadvantage: The existing GPS system has been used for many years, monitoring system used in the use of a variety of problems can not be corrected, the business unit proposed new requirements have not been able to join.

Scenario Two:

Advantages: Upgrade the existing GPS monitoring system, improve the use of the shortcomings, to increase the business sector to put forward new requirements, such as increased in-car status real-time video backhaul needs. There are some domestic terminal equipment manufacturers using 3G network can be used in real-time video backhaul car status, such equipment prices around 2500 to 6000 yuan, and the need to open China Unicom WCDMA 3G Network services, network operating costs between 100 yuan to 300 yuan per month.

Disadvantage: First, the GPS system has been used in China for more than 10 years, has a wealth of vendor resources. And the production of Beidou navigation terminal manufacturers relatively few, at present most are also in the starting state. Need to find some big manufacturers such as Huaqiang, SEG, Adsale and so on not only have Beidou related products, but also to the existing system of the transformation to provide technical support. Second, the 3G network has been promoted in China for many years, but due to its high cost of use, coupled with the real-time video backhaul requires sufficient network traffic, which also formed an unavoidable contradiction.

The current implementation of vehicle video surveillance, most of the use of car recorder , the price of about 200 to thousands of yuan. The driving record technology realizes relatively simple, is adds the large capacity memory card the camera device, if configures the maximum capacity memory card, may record the video information within half month at a time. This device is equivalent to the black box on the aircraft, can call the recorder internal video image at any time when needed, some high-end traffic recorder also provides the function of video real-time back to the monitoring center.

Programme III:

Advantage: Replace the current GPS monitoring system with the new system, which can be fully customized to the requirements of the business unit.

Disadvantage: The development of new systems work a large amount. Need the business units, counties and enterprises to provide clear and complete requirements of the document, GPS system in Shanxi province for many years, during the period also continued to improve and update. The replacement of the existing GPS system, but also abandoned the GPS system accumulated all the experience and regulation provisions on the implementation of the realized function; second, the new system needs to be connected to the current provincial operating GPS network, that is, the new system and the old system integration workload to be evaluated.

Other questions:

1. The construction of a new system needs to have related hardware equipment support, the current GPS hardware equipment may not be suitable for continued use, hardware input to be evaluated;
2. The scale of system construction needs to be evaluated;
3. The use of the new system will lead to the training of relevant operators and the familiar process.
4. The use of the new system needs to take into account the acceptability of the enterprise and the business households.

Conclusion

The further implementation of the Beidou system needs to be considered in terms of cost, investment, team technical strength and compatibility of existing systems, and only after further research and confirmation by various business units can the next outline design be carried out.

Research on GPS-Beidou satellite positioning System "technology-independent"