Is the navigation system we use on our mobile phones now Beidou or GPS?

1. Verses about the Beidou Navigation System

Verses about the Beidou Navigation System 1. About the Beidou Satellite Navigation System

As of 2010, 3 satellites have been launched Beidou navigation satellite. According to the overall system construction plan, the global Beidou satellite navigation system can only be completed around 2020.

The launch times of the Beidou-1 navigation and positioning satellites are:

October 31, 2000, Beidou-1A.

December 21, 2000, Beidou-1B.

On May 25, 2003, the backup satellite Beidou-1C was launched.

On February 3, 2007, the Xichang Satellite Launch Center successfully launched the Beidou navigation test satellite Beidou-1D.

The launch times of the Beidou-2 navigation and positioning satellites are:

At 4:11 on April 14, 2007, a Beidou navigation satellite (M1) launched from the Xichang Satellite Launch Center It was launched into space using the "Long March 3A" carrier rocket.

On April 15, 2009, Beidou G2 was successfully launched by the Long March-3C rocket and was located in the geostationary orbit.

On January 17, 2010, the Xichang Satellite Launch Center used the Long March The No. 3C carrier rocket launched the third Beidou navigation satellite (G1).

The construction of the Beidou satellite navigation system has successfully launched three Beidou navigation satellites. According to the overall system construction plan, around 2012, after launching more than ten satellites, the system will first have positioning, navigation and timing as well as short message communication service capabilities covering the Asia-Pacific region, that is, to solve regional problems; around 2020, By launching a network of 30 geostationary and non-geostationary satellites, the global Beidou satellite navigation system will be fully completed.

2. Essay collection on Beidou Navigation

Beidou Navigation System is a regional navigation system covering my country’s mainland. The coverage area is about 70° to 140° east longitude and 5° to 55° north latitude. GPS is an all-weather navigation system covering the world. It can ensure that 6-9 satellites can be observed at any time and anywhere on the earth (actually up to 11 satellites can be observed).

Basic data

The Beidou navigation system is to set up two geosynchronous satellites on the earth's equatorial plane. The equatorial angular distance of the satellites is about 60°. GPS sets 24 satellites on 6 orbital planes, with an orbital equatorial inclination of 55° and an equatorial angular distance of 60°. The satellite is in a quasi-synchronous orbit, orbiting the earth in 11 hours and 58 minutes.

Positioning principle

The Beidou navigation system is an active two-way ranging two-dimensional navigation. The ground center control system solves the problem and provides users with three-dimensional positioning data. GPS is a passive pseudo-code one-way ranging three-dimensional navigation. The user device independently solves its own three-dimensional

positioning data. This working principle of "Beidou-1" brings two problems. One is that the user loses radio concealment while positioning, which is quite disadvantageous in the military. On the other hand, the equipment must contain transmitters

< p> machine, so it is at a disadvantage in terms of size, weight, price and power consumption. Positioning accuracy

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

User capacity

Since the Beidou navigation system is an active two-way ranging interrogation-response system, the user equipment and the geostationary satellite must not only receive interrogation signals from the ground center control system , the user equipment is also required to transmit a response signal to the geostationary 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 the Beidou navigation system is limited. GPS is a one-way ranging system. User equipment can perform ranging and positioning as long as it receives navigation messages sent by navigation satellites. Therefore, the capacity of GPS user equipment is unlimited.

Survivability

3. How to write an essay about Beidou Satellite Navigation

Beidou Satellite Navigation System is an independently operated global satellite navigation system that China is implementing independent research and development. It is similar to the GPS of the United States. Russia's GLONASS and the European Union's Galileo system are compatible with the world's most popular global satellite navigation systems.

Beidou Navigation has provided continuous navigation, positioning and timing services since December 27, 2011, but it is estimated that it will still be 6 years before we start using it. There are 35 Beidou satellites, 5 of which are in geostationary orbit and the rest are in non-geostationary orbit. From 2007 - my country sent 10 Beidou satellites into predetermined orbits. Beidou Navigation is my country's "Ninth Five-Year Plan" project, code-named Beidou 1. Its plan was proposed in 1938. As for why our country wants to build Beidou Navigation, it is because as a developing country, our country has vast territory and sea areas. The Beidou system plays an important role in national defense. The application can increase combat effectiveness by more than 100 times and combat cost-effectiveness ratio by 10 times, which can greatly improve national defense capabilities and reduce the burden on the national defense economy. Of course, that’s not all. Beidou Navigation will have broad application prospects in intelligent transportation, traffic information management, road congestion management, vehicle monitoring and autonomous vehicle navigation. And it gradually plays an important role in many fields such as surveying, mapping, telecommunications, water, transportation, fishery exploration, forest fire prevention, etc.

Many people believe that because the Beidou navigation system is not as good and stable as GPS, they do not support the research and development of Beidou. In my opinion, the research and development of Beidou is very necessary. Beidou is my country's own navigation system and can be controlled by itself. If the system of another country is used for a long time, and if the two countries become hostile, the country that develops the navigation system will have the right to block the signal. At this time, not only transportation was paralyzed, but also military losses were more serious. In addition, Beidou also has advantages over other navigation systems. 1) "Beidou" has dual functions of positioning and communication. It has SMS communication functions that many navigation systems do not have. 2) The positioning accuracy of "Beidou" is about 20 meters. 3) The current price of "Beidou" terminals has tended to the price of GPS terminals in the United States. 4) Using receiving terminals does not require the laying of ground base stations. 5) The ships at the disaster center can be Can send information

However, in my opinion, the biggest challenge that the Beidou navigation system will face is how to survive in the global market. For example, no relevant information appears when searching for Beidou navigation in the smartphone software market. , but there are quite a lot of related software for searching for GPS. From this point of view, Beidou lags behind GPS in terms of by-products. Yes, what Beidou lacks is not technology, but application imagination. GPS in the United States has been exhausted for 30 years. , Of course, it is mature and stable. The Beidou system was only completed in 2020 and was just born. The prime of life and the baby are not of the same order of magnitude and cannot be compared, but Beidou is necessary for the development of politics, military, policy, and market. In addition, the price of Beidou and GPS. There is also a huge difference. In the global satellite navigation market, the American GPS accounts for more than 95% due to its early development. It is difficult for Beidou to occupy the market.

So how do we gain the market? On our own, if the openness and longitude are sufficient, our own market will be fine. First, in terms of civilian use, the Beidou car navigation system has government support. This rigid condition is very reliable. After all, the domestic market is huge. The Chinese automobile market accounts for a large proportion of the global automobile market. Second, the starting point for developing the Beidou navigation system is its military practical value. The development of civilian applications is just an additional revenue channel, and the military value cannot be measured in terms of money. /p>

4. How to write a short novel about the Beidou vehicle navigation system

Let me give you a general idea

The use of the so-called Beidou vehicle navigation system. The method and working principle are similar to GPS. The first is to determine your location, and the second is to get a recommended driving route.

Then the idea is there. Or plots such as travel or adventure can be written into novels, as long as the system is applied.

I will use an easy-to-understand method. For example, a boy, his girlfriend was angry with him, ran away, and returned to his hometown. The boy didn’t know the way to her house. I found her address in the previous letter, so I found her with the help of the Beidou satellite navigation system, apologized to her with a large bouquet of roses, and the two reconciled. That's it, a standard HAPPY END.

5. BeiDou Navigation System

BeiDou (COMPASS) Navigation Satellite System﹞ is an independently developed and independently operated global satellite navigation system being implemented by China.

The Beidou satellite navigation system consists of three parts: the space end, the ground end and the user end. The space end includes 5 geostationary orbit satellites and 30 non-geostationary orbit satellites. The ground end includes the main control station, injection station and There are several ground stations such as monitoring stations, and the user terminal consists of Beidou user terminals and terminals compatible with other satellite navigation systems such as American GPS, Russian GLONASS, and European GALILEO. The space segment of the Beidou satellite navigation system consists of 5 geostationary orbit satellites and 30 non-geostationary orbit satellites. It provides two service methods, namely open service and authorized service (belonging to the second generation system).

The open service provides free positioning, speed measurement and timing services in the service area. The positioning accuracy is 10 meters, the timing accuracy is 50 nanoseconds, and the speed measurement accuracy is 0.2 meters/second. Authorization services provide authorized users with more secure positioning, speed measurement, timing and communication services, as well as system integrity information.

China plans to have the Beidou system covering the Asia-Pacific region around 2012 and the whole world around 2020. Our country is implementing the construction of the Beidou satellite navigation system and has successfully launched six Beidou navigation satellites.

According to the overall system construction plan, around 2012, the system will first have positioning, navigation, timing and short message communication service capabilities covering the Asia-Pacific region; around 2020, the Beidou satellite navigation system will be completed covering the world. . The "Beidou" satellite navigation test system (also known as the "Double Star Positioning and Navigation System") is listed in my country's "Ninth Five-Year Plan". Its project code is named "Beidou-1", and its plan was proposed in 1983.

At 0:34 on May 25, 2003, my country successfully launched the third "Beidou-1" satellite into space using the "Long March-3A" carrier rocket at the Xichang Satellite Launch Center. The first two satellites were launched on October 31 and December 21, 2000 respectively. So far, the navigation and positioning system has been operating stably and in good condition.

What is launched this time is the backup satellite of the navigation and positioning system. It forms a complete satellite navigation and positioning system with the first two "Beidou-1" working satellites to ensure the provision of satellite navigation information all-weather and around the clock. . This marks that our country has become the third country in the world to have established a complete satellite navigation system after the United States GPS and Russia's GLONASS. The establishment of this system will play a positive role in our country's national defense and economic construction.

On February 3, 2007, the fourth satellite of "Beidou-1" was successfully launched. This satellite not only serves as a backup for the three earlier satellites, but will also perform related tasks for the "Beidou" satellite navigation and positioning system. test. Currently, "Beidou-1" has four satellites traveling in space, forming a complete satellite navigation and positioning system to ensure that satellite navigation information is provided around the clock and around the clock.

"Beidou-1" is an all-weather, regional satellite positioning system that uses geostationary satellites to provide users with rapid positioning, short digital message communication and timing services. The system consists of two geostationary satellites (800E and 1400E), an on-orbit backup satellite (110.50E), a central control system, a calibration system and various user computers.

Its coverage area is the heartland between 55 and 55 degrees north latitude and 70 and 140 degrees east longitude. It is large at the top and small at the bottom. The widest point is around 35 degrees north latitude. The positioning accuracy is a horizontal accuracy of 100 meters (1), and after the calibration station is established, it is 20 meters (similar to a differential state). The operating frequency is 2491.75MHz. The number of users the system can accommodate is 540,000 households per hour.

"Beidou-1" has a small number of satellites, small investment, simple and cheap user equipment, and can realize navigation, positioning, communication and other purposes in a certain area. It can meet the needs of my country's current land, sea and air transportation navigation. positioning needs. In terms of performance, there is a big gap between Beidou-1 and American GPS.

First, the coverage is only preliminary in positioning capabilities in the surrounding areas of my country, which is far from the global positioning of GPS. Second, the positioning accuracy is low, with a maximum positioning accuracy of 20 meters, while GPS can reach within 10 meters.

Third, due to the satellite radio measurement system, user terminals need to send radio signals when working, which will be discovered by enemy radio detection equipment, and are not suitable for military use. Fourth, it cannot be used on high-speed mobile platforms, which limits its application in aviation and land transportation.

But the most important thing is that "Beidou-1" is a satellite navigation system independently established by our country. Its successful development marks that our country has broken the monopoly of the United States and Russia in this field and solved China's independent problem. Are there any problems with the satellite navigation system? It is a successful, practical, low-investment system for getting started.

In addition, this system does not exclude the widespread use of GPS in the domestic civilian market. Based on the "Beidou" navigation test system, my country has begun to gradually implement the construction of the "Beidou" satellite navigation system. It will first meet the navigation and positioning needs of China and its surrounding areas, and then conduct system networking and testing, and gradually expand to global satellite navigation. positioning system.

"Beidou" satellite navigation and positioning system ("Beidou 2") "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" has military uses "The satellite navigation system will be deployed within 4 years. Some experts say that after the deployment of the second-generation Beidou satellite system is completed, China will be able to launch precise attacks on small targets. Some media in the United States believe that China is using the Beidou program to suppress the military advantages of U.S. satellites.

With the improvement of my country’s comprehensive national strength and the full penetration of satellite navigation and positioning systems into ordinary people’s lives, as well as the temptation of the United States’ GPS-guided high-precision strike weapons in the Kosovo War and the Second Gulf War, it is necessary to build a system similar to GPS The global satellite navigation and positioning system has been put on the agenda, and the "Beidou" satellite navigation and positioning system ("Beidou-2") has been officially constructed since 2007. The "Beidou" satellite navigation and positioning system requires the launch of 35 satellites, a full 11 more than GPS.

According to the plan, the "Beidou" satellite navigation and positioning system will consist of 5 geostationary orbit satellites and 30 non-geostationary orbit satellites, using the "Dongfanghong"-3 satellite platform. The 30 non-geostationary orbit satellites are subdivided into 27 medium orbit (MEO) satellites and 3 inclined synchronous orbit (IGSO) satellites. The 27 MEO satellites are evenly distributed on three planes with an inclination angle of 55 degrees and an orbital altitude.

6. China's Beidou Satellite Navigation System

The Beidou Satellite Navigation System is a regional active three-dimensional satellite positioning and communication system (CNSS) independently developed by China. It is the only global satellite navigation system besides the United States. Positioning System (GPS), the third mature satellite navigation system after Russia's GLONASS. It can provide high-precision and highly reliable positioning, navigation, and timing services to all types of users around the world, all day and night, and has short message communication capabilities. The eighth and ninth Beidou satellites were launched into scheduled transfer orbits in space by the Long March 3A carrier rocket in 2011. In December 2011, Beidou Satellite Navigation System spokesperson Ran Chengqi said that the Beidou Satellite Navigation System will have global coverage capabilities by 2020. In March 2012, my country officially launched the world's first "Beidou + GPS" dual-system vehicle navigation product.

Table of Contents

System Introduction

System Services

System Evaluation Features

Disadvantages

Development History

Construction Principles Openness

Autonomy

Compatibility

Progressiveness

Construction Plan

Construction Goals

Launch Time

Composition and Working Principle of Satellite

Four Major Functions

Beidou Progress Three Step by step progress

Comprehensive testing

Comprehensive coverage

Introduction to Beidou from generation to generation

Development process

Own characteristics< /p>

Cracking incident

Introduction to Beidou II

Development process

Practical application of military functions

Civilian functions

Global coverage

Future development and development process

Challenges faced

Cooperation and exchanges

Strategic significance

Introduction to GPS GPS compared to

Coverage

Number of tracks

Positioning principle

Positioning accuracy

User capacity

Survivability

Real-time effect

Terminal support

Channel battle

Trial operation< /p>

Other systems

Introduction to the first dual-system launch system

System services

System evaluation features

Disadvantages< /p>

Development History

Construction Principle Openness

Autonomy

Compatibility

Progressiveness

Construction Plan

Construction Goals

Launch Time

Composition and Working Principle

Progress of Beidou Satellite's Four Major Functions

The three-step progress comprehensive test fully covers Beidou first generation

The first generation introduces the development process, its own characteristics and cracking events, Beidou second generation

The second generation introduces the practical application of the development process

< p> Military functions and civilian functions cover the global future development

The development process faces challenges, cooperation and exchanges, strategic significance compared to GPS

Introduction to GPS Coverage Quantity Orbital Positioning Principle Positioning Accuracy User Capacity Survivability Real-time The battle for effect terminal supporting channels, trial operation of other systems, and the launch of the first dual system are underway