第1个回答 2011-06-28
" The Big Dipper, first " several ground tracking station is mainly used for tracking and satellite navigation satellite orbits of good monitoring, on this basis, we can turn it into a new system of tracking systems, expansion of the new tracking station, to ensure that the navigation and completeness of the data processing. Navigation controls are mainly used for : the whole constellation of orbit determination and track extrapolation ; monitoring the working conditions of satellite ; standardization of in - orbit satellite clock ; signal accuracy of prediction in orbit ; generate a geocentric reference frame, generation navigation data information. Completeness detection include : signal to regional or global coverage completeness monitoring ; granting of completeness of the data can be observed in real time ; focus on completeness of all satellite data ; provides all satellite completeness of identifiers. Regional enhanced GPS navigation systems is stepping up its construction in China. " The Big Dipper, first " satellite navigation enhancement system is China's development plans and the construction of wide area differential GPS system. With an enhanced system of ground facilities for the purposes of satellite monitoring and management, leveraging its communication links for communication satellites and ground segment. China currently has several distribution GPS tracking stations and satellite laser stations across the country, after appropriate modification to the implementation of China's next - generation navigation satellite monitoring tasks. High - accuracy characteristics from satellite observations, completed in the high - precision navigation satellite orbit, creating conditions for further navigation and positioning services. This shows that China has a lot of ground infrastructure, through appropriate reform for China's new generation of navigation and positioning systems provides ground control center monitoring and satellite tracking station, navigation information into the station, for construction of the satellite navigation system to save a lot of expenses. Renovation work to tighter overall plan, must take into account geographic distribution and the number of different types of ground stations and other factors, so that they assume different responsibilities in the new system, achieving optimal use of existing ground facilities and optimal design of new systems. 3. Compatible with the foreign system, enhanced reliability and anti-interference system in China In order to seize the enormous opportunities of satellite navigation system has, to regain the domestic market, further participate in international competition and cooperation, China's second generation satellite navigation system should be compatible with the international navigation system. To achieve compatibility with systems in foreign countries, mainly by GPSGLANASSGalileo three system and China's satellite navigation and positioning system of satellites, satellite clock time coordinates system standards, research of receiver signal and navigation message format to develop combined satellite navigation signal communication system standards and data formats standards, reach and international synchronization, constellation navigation system standards and coordinate frame and time format. National security , and information war , and space security , and marine security , and disaster disaster relief , and traffic security , and emergency rescue , and burst accident processing , and expedition and so on and national economy and social development many area close associated of affairs , on satellite positioning system of reliability and anti - interference sexual requirements highest , required guarantee in any when does not by abroad hostile forces interference , and navigation system in space cover and time continuity two aspects are is seamless connection of . For this , need take corresponding countermeasures : ① navigation satellite ground track station of track way used two species or two species above , as increased has anti - electronic interference function of satellite laser ranging track way ; ② established can while track multiple navigation satellite system of satellite ground track station network , and established Star base enhanced system , implementation information service automation ; ③ development can received and processing multiple navigation satellite signal of more star fusion received device and the hard software system , improve positioning navigation of reliability . Third, the development of China's civilian global positioning system recommendations In China independent of satellite navigation system of development , must based on Yu in China of basic conditions , target is to built a has world advanced level of regional or global satellite navigation positioning system , to meet high - tech conditions Xia local wars on navigation positioning of need , gradually built a tactical performance good , run stability reliable , Yu future military struggle task and weapons equipment development phase adaptation , full independent of satellite navigation positioning system . The system should be an around-the-clock, continuous, three - dimensional, passive high - precision global positioning and navigation, and timing system, supports terrestrial, marine and air needs of the users navigation and location, at the same time can do GPSGLONASS GALILEO system - compatible. 1. Fully autonomous, suitable for China Navigation satellite systems must have the self control, cannot guarantee future wars means in other hands. System must meet the construction and development of China's national conditions, that is, to adapt to the needs of national defense and economic construction, and technology, and economic capacity to adapt.