Is the navigation system used by our mobile phone Beidou or gps now?

1. Poem about Beidou navigation system

Poem 1 about Beidou navigation system. About Beidou satellite navigation system

By 20 10, three Beidou navigation satellites have been launched. According to the overall planning of system construction, the Beidou satellite navigation system covering the whole world can only be built around 2020.

The launch time of Beidou-1 navigation and positioning satellite is as follows:

June 2000 65438+1October 3 1, Beidou-1a.

June 5438+February 2, 20001,Beidou-1b.

On may 25, 2003, the standby satellite Beidou-1c.

On February 3rd, 2007, xichang satellite launch center successfully launched Beidou-1D, the Beidou navigation test satellite.

The launch time of Beidou-2 navigation and positioning satellite is as follows:

A Beidou navigation satellite (M/KOOC-0/) was launched from xichang satellite launch center by the Long March 3A carrier rocket at 4: 00/KOOC-0/on April/4, 2007.

On April 15, 2009, Beidou G2 was successfully launched by the Long March III C rocket, which was located in the geostationary orbit.

20 10, 1 On June 7th, 2008, xichang satellite launch center launched the third Beidou navigation satellite (G 1) with the Long March III C carrier rocket.

The construction of Beidou satellite navigation system has successfully launched three Beidou navigation satellites. According to the overall planning of system construction, after launching more than ten satellites around 20 12, the system will first have the ability of positioning, navigation, timing and short message communication services covering the Asia-Pacific region, that is, to solve regional problems; Around 2020, geostationary orbit and 30 non-geostationary orbit satellites will be launched, and Beidou satellite navigation system covering the whole world will be built in an all-round way.

2. Beidou navigation essay

Beidou navigation system is a regional navigation system covering China. The coverage is about 70- 140 east longitude and 5-55 north latitude. Gps is an all-weather navigation system covering the whole world. It can be guaranteed that 6-9 satellites can be observed anywhere on the earth at any time (in fact, at most 1 1 satellite can be observed).

primary data

Beidou navigation system is to set two geosynchronous satellites on the equatorial plane of the earth, and the equatorial angle of each satellite is about 60. Gps will set 24 satellites on six orbital planes, with an equatorial inclination of 55 and an equatorial angular distance of 60. The satellite is in quasi-synchronous orbit, circling the earth once 1 1 hour and 58 minutes.

Positioning principle

Beidou navigation system is an active two-way ranging two-dimensional navigation. The ground center control system solves the calculation of three-dimensional positioning data for users. Gps is passive pseudo-code one-way ranging three-dimensional navigation. The user equipment independently solves its own three dimensions.

Positioning data. This working principle of Beidou-1 brings two problems. On the one hand, users lose radio concealment while positioning, which is quite unfavorable in the military. On the other hand, devices must include transmission.

Machine, so in terms of volume, weight, price and power consumption at a disadvantage. positioning accuracy

The three-dimensional positioning accuracy of Beidou navigation system is about tens of meters, and the timing accuracy is about 100ns. The three-dimensional positioning accuracy of gps P code is improved from 16m to 6m, and that of C/A code is improved from 25- 100m to 12m. The timing accuracy is about 20ns.

User capacity

Beidou navigation system is an inquiry-response system with active two-way ranging. The user equipment and geosynchronous satellite not only receive the inquiry signal from the ground center control system, but also need the user equipment to transmit to the geosynchronous satellite.

In this way, the user capacity of the system depends on the channel blocking rate allowed by the user, the interrogation signal rate and the user's response frequency. Therefore, the user equipment capacity of Beidou navigation system is limited. Gps is a one-way measurement.

As far as the system is concerned, as long as the user equipment receives the navigation message from the navigation satellite, it can carry out ranging and positioning, so the capacity of the gps user equipment is infinite. viability

3. How to write the composition about Beidou satellite navigation?

Beidou satellite navigation system is a global satellite navigation system independently developed by China, which is compatible with American GPS, Russian GLONASS and EU Galileo.

Beidou navigation has been providing continuous navigation, positioning and timing services since 20112.27, but it is estimated that it will take six years to really start using it. There are 35 Beidou satellites, of which 5 are geostationary orbit satellites and the rest are non-geostationary orbit satellites. Since 2007, China has put 10 Beidou satellite into the scheduled orbit. Beidou navigation is China's ninth five-year plan, code-named Beidou 1, and its scheme was put forward in 1938. As for why China should build Beidou navigation, it is because China, as a developing country, has a vast territory and vast sea area. The application of Beidou system in national defense can improve the operational efficiency by more than 100 times, and the operational efficiency-cost ratio is 10. Of course, not only that, Beidou navigation will have a wide application prospect in intelligent transportation, road information management, road congestion control, vehicle monitoring, vehicle autonomous navigation and so on. But also plays an important role in surveying and mapping telecommunications, water conservancy, transportation, transportation, fishery exploration, forest fire prevention and many other fields.

Many people think that because Beidou navigation system is not as good as GPS and has poor stability, it will not support the research and development of Beidou. In my opinion, the development of Beidou is very necessary. Beidou is China's own navigation system, which can be controlled by itself. If the system of other countries is used for a long time, once the two countries are hostile, the country that develops the navigation system has the right to block the signal. At this time, it is not only the traffic, but also the military losses. In addition, Beidou is more advanced than other navigation. 1) Beidou has dual functions of positioning and communication, and its short message communication function is not available in many navigation systems. 2) The positioning accuracy of Beidou is about 20 meters. 3) At present, the price of Beidou terminal has tended to the price of American GPS terminal. 4). The receiving terminal does not need to lay a ground base station. 5) Ships in the disaster center can send messages within one second.

But the biggest challenge that Beidou navigation system will face, in my opinion, is how to survive in the global market. For example, there is no relevant information when searching for Beidou navigation in the smart phone software market, but there are quite a few related softwares when searching for GPS. From this point of view, Beidou lags behind GPS in by-products. Yes, what Beidou lacks is not technology, but applied imagination. The gps in America has been used for 30 years. Mature and steady, of course. Beidou system was built in 2020 and just born. The prime of life and the baby are not the same order of magnitude and incomparable, but the political, military, policy and market development of Beidou is necessary. e 799 be 5 ba a6 e4b 893 e5b 19e 3 13336333333333334。 In addition, the prices of Beidou and GPS are also far apart. In the global satellite navigation market, due to the early development of GPS in the United States, the share has exceeded 95%, and it is difficult for Beidou to occupy the market.

So how do we get the market? On our own, if the openness and longitude are enough, our own market will be fine. First, in terms of civilian use, the Beidou car navigation system is supported by the government, and this hard condition is very reliable. After all, the domestic market is very large, and China auto market accounts for a large part of the global auto market. Second, the starting point of developing Beidou navigation system is military practical value, and the development of civilian use is only an additional channel to increase income, and military value cannot be measured by money.

4. How to write a novel about Beidou car navigation system?

Let me give you a general idea.

The use method and working principle of the so-called Beidou vehicle navigation system are similar to GPS. Its function is firstly to determine its own position, and secondly to obtain the recommended driving route.

Then there is an idea. As long as it is about finding people or traveling or exploring, it can be written into novels as long as it is applied to the system.

I do it in an easy-to-understand way. For example, a boy whose girlfriend was angry with him left and went back to his hometown. The boy didn't know the way to her house, but he found her address in the previous letter, so he found her with the help of Beidou satellite navigation system and apologized to her with a bunch of roses. They made up. That's it, the standard happy ending.

5. Beidou navigation system

Beidou satellite navigation system (Beidou navigation satellite system) is a global satellite navigation system independently developed and operated by China.

Beidou satellite navigation system consists of three parts: space terminal, ground terminal and user terminal. The space terminal includes 5 geostationary satellites and 30 non-geostationary satellites. The ground terminal includes several ground stations, such as main control station, injection station and monitoring station. The user terminal consists of Beidou user terminal and terminals compatible with other satellite navigation systems such as American GPS, Russian GLONASS and European Galileo. The space section of Beidou satellite navigation system consists of 5 geostationary satellites and 30 non-geostationary satellites, providing two service modes (open service and authorized service).

Open service is to provide free positioning, speed measurement and time service in the service area. The positioning accuracy is10m, the timing accuracy is 50ns, and the speed measurement accuracy is 0.2m per second. Authorization service is to provide more secure positioning, speed measurement, timing and communication services and system integrity information for authorized users.

China plans to cover the Asia-Pacific region around 20 12 and the whole world around 2020. China is implementing the Beidou satellite navigation system, and has successfully launched six Beidou navigation satellites.

According to the overall planning of system construction, around 20 12, the system will first have the ability of positioning, navigation, timing and short message communication services covering the Asia-Pacific region; Around 2020, the Beidou satellite navigation system covering the whole world will be built. Beidou satellite navigation test system (also known as "double-star positioning navigation system") is one of the ninth five-year plan projects in China. Its engineering code is "Beidou-1", and the scheme is put forward in 1983.

At 0: 34 on May 25th, 2003, China successfully sent the third Beidou-1 satellite into space by the Long March 3A carrier rocket in xichang satellite launch center. The first two satellites were launched on June 3, 2000 1,1,February 2, 20001and 65438, respectively. Since the operation, the navigation and positioning system has been stable and in good condition.

This launch is the backup star of the navigation and positioning system, which together with the first two working stars of Beidou-1 form a complete satellite navigation and positioning system to ensure all-weather and all-day satellite navigation information. This indicates that China has become the third country in the world to establish and improve the satellite navigation system after GPS in the United States and GLONASS in Russia. The establishment of this system will play a positive role in China's national defense and economic construction.

On February 3, 2007, the fourth satellite of Beidou-1 was successfully launched. This satellite will not only serve as a backup for the early three satellites, but also carry out related tests of Beidou satellite navigation and positioning system. At present, Beidou-1 has four satellites roaming in space, forming a complete satellite navigation and positioning system to ensure all-weather and all-day satellite navigation information.

Beidou-1 is an all-weather and regional satellite positioning system, which provides users with fast positioning, short digital message communication and time service by using geosynchronous satellites. The system consists of two geostationary satellites (800E and 1400E), an on-orbit backup satellite (1 10.50E), a central control system, a calibration system and various user computers.

It covers the heart area between 5-55 north latitude and 70-140 east longitude, the largest part and the smallest part, and the widest part is about 35 north latitude. The positioning accuracy is horizontal 100 m (1), 20 m after setting the calibration station (similar to differential state), the working frequency is 249 1.75MHz, and the system can accommodate 540,000 users/hour.

Beidou-1 has a small number of satellites, low investment, simple and cheap user equipment, and can realize navigation and positioning in a certain area, communication and other purposes, and can meet the current needs of land, sea and air traffic in China for navigation and positioning. In terms of performance, Beidou-1 is far from American GPS.

First, the coverage is only a preliminary ability to locate the periphery of China, which is far from the global positioning of GPS. Second, the positioning accuracy is low, with the highest positioning accuracy of 20 meters, while GPS can reach 10 meters.

Thirdly, due to the satellite radio measurement system, the user terminal will send out radio signals when working, which will be found by enemy radio detection equipment and is not suitable for military use. Fourthly, it cannot be used on high-speed mobile platforms, which limits its application in aviation and land transportation.

But most importantly, Beidou-1 is a satellite navigation system independently established by China. Its successful development indicates that China has broken the monopoly position of the United States and Russia in this field and solved the problem of China's autonomous satellite navigation system. It is a successful, practical and low-cost initial startup system.

In addition, the system does not rule out the wide application of GPS in the domestic civil market. Based on the Beidou navigation test system, China has gradually implemented the construction of Beidou satellite navigation system. First, to meet the navigation and positioning needs of China and its surrounding areas, the system will be networked and tested, and gradually expanded into a global satellite navigation and positioning system.

"Beidou" satellite navigation and positioning system (referred to as "Beidou II") and "2006 China Aerospace White Paper" announced that five major aerospace projects will be launched in the next five years, among which the second generation Beidou satellite navigation system with military use will be deployed within four years. Some experts say that after the deployment of the second generation Beidou satellite system, China will be able to launch precise strikes against small targets, while some American media believe that China will use the Beidou plan to suppress the military superiority of American satellites.

With the improvement of China's comprehensive national strength and the comprehensive penetration of satellite navigation and positioning system into the lives of ordinary people, as well as the temptation of the United States to attack GPS-guided high-precision weapons in the Kosovo War and the Second Gulf War, the construction of a global satellite navigation and positioning system similar to GPS began to be put on the agenda, and the Beidou satellite navigation and positioning system ("Beidou II") was officially completed in 2007. Beidou satellite navigation and positioning system needs to launch 35 satellites, 1 1 more than GPS.

According to the plan, the Beidou satellite navigation and positioning system will be composed of 5 geostationary satellites and 30 non-geostationary satellites, using the "Dongfanghong" -3 satellite platform. The 30 non-geostationary orbit satellites are subdivided into 27 MEO satellites and 3 IGSO satellites. Twenty-seven MEO satellites are evenly distributed on three planes with an inclination of 55 degrees.

6. China Beidou satellite navigation system

Beidou satellite navigation system is a regional active three-dimensional satellite positioning communication system (CNSS) independently developed by China. It is the third mature satellite navigation system after the global positioning system (GPS) in the United States and GLONASS in Russia. It can provide high-precision and high-reliability positioning, navigation and timing services for all kinds of users around the world, and has the ability of short message communication. The eighth and ninth Beidou satellites were sent into space by the Long March 3A carrier rocket at 20 1 1. 2011/in February, Ran Chengqi, spokesman of Beidou satellite navigation system, said that Beidou satellite navigation system will form global coverage in 2020. 20 12 March, China officially launched the world's first "Beidou +GPS" dual-system vehicle navigation product.

catalogue

System introduction

System service

Characteristics of systematic evaluation

Disadvantaged

Development history

Openness of architectural principles

independence

get along well with

Progressives

structure chart

Construction goal

launch time

Composition and working principle of satellite

Four functions

Three steps of Beidou progress

Comprehensive test

Full underwriting

Introduction of Beidou from generation to generation

Color development method

Own characteristics

Cracking event

Introduction of Beidou Second Generation and Second Generation

Color development method

Practical application of military functions

Civil function

Global coverage

Future development process

Face challenges

Cooperation and communication

Strategic significance

Brief introduction of GPS and comparison of GPS

Scope of action

Quantitative orbit

Positioning principle

positioning accuracy

User capacity

viability

Real-time effect

Terminal matching

Channel dispute

Operate on the basis of experiments

Other systems

Introduction of the first dual-system launch system

System service

Characteristics of systematic evaluation

Disadvantaged

Development history

Openness of architectural principles

independence

get along well with

Progressives

structure chart

Construction goal

launch time

Composition and working principle

Progress in Four Functions of Beidou Satellite

Three steps, comprehensive testing, Beidou generation comprehensive coverage

The first generation introduced the characteristics of the development process and cracked the Beidou-2 incident.

Practical application of the second generation introduction and development process

Military and civilian functions cover the future development of the world.

The development process is facing challenges, and the strategic significance of cooperation and exchange is compared with that of GPS.

This paper briefly introduces the coverage, quantity, orbit positioning principle, positioning accuracy, user capacity, survivability, real-time effect, competition for terminal support channels, trial operation of other systems and the launch of the first dual system.