What is the positioning principle of Beidou satellite? What are the difficulties?

Introduction: Our country's Beidou satellite navigation system.

It's very good and relatively safe. Many people want to know what is the positioning principle of Beidou satellites and what are their difficulties? Let's find out.

<> fact, the principle of Beidou satellite positioning is to calculate the user's distance through the distance of some satellites for positioning. We need to know the sum of the distances between the user and the satellite, at this time, we need to know that the first satellite is in a spherical surface in the center of the sphere, at this time there will be two satellites as an intersection point, on a plane of an elliptical sphere, forming an intersection line, at this time we can calculate the user's location. And there will be some central control system in the middle, there will be some quality stored in the computer at this time to find a map, you can accurately calculate the user's location, you can also know that the user is in a certain place and a focus of the earth.

Therefore, at this time, through the central control system, the three-dimensional coordinates of the user's point can be finally calculated, according to this coordinate system.

You can send a signal to the user, and the user can find out where he is.

It is very easy for people to use the Beidou satellite positioning system, but researchers need to make some difficult leaps before making it to make the Beidou satellite positioning system more perfect. First of all, we need to know the satellite positioning, which may have a time difference in arrival.

Therefore, researchers have to cross this difficulty to calculate some concepts of arrival time difference. First of all, we need to know what the concept of arrival time difference is, which is to use the precise position of each satellite. In order to send some navigation information, you can get some received information on the satellite, and the time difference of arrival at this time is called the arrival time difference.

And it is also necessary to know the position of the satellite, and it is necessary to know how to receive the observation of the satellite, and also to calculate the distance between the satellite and the receiver, so as to calculate the accurate position.

Positioning is based on GPS cruise. It is difficult to position, it is very difficult to cruise, it is very difficult to position, it is very difficult to propagate signals, it is also difficult to propagate signals in a vacuum, and then it will be very difficult to transmit.

Beidou applications have five major advantages:

1. It has both positioning and communication functions, and does not need the support of other communication systems, while GPS can only be positioned.

2. With large coverage and no communication blind spots, the Beidou system covers China and neighboring countries and regions, and can serve not only China but also neighboring countries.

3. It is especially suitable for large-scale monitoring management and data collection user data transmission applications of group users.

4. Integrate the two major resources of Beidou navigation and positioning system and satellite augmentation system, so GPS can also be used to make its application more abundant.

5. Autonomous system, safe, reliable, stable, strong confidentiality, suitable for key department applications.

1. The space segment of the Beidou system adopts a hybrid constellation composed of three orbital satellites, which has strong anti-blocking ability, especially in low-latitude areas.

2. The Beidou system provides navigation signals at multiple frequencies, which can improve the service accuracy through the combination of multi-frequency signals.

3. The Beidou system innovatively integrates navigation and communication capabilities, and has five major functions: real-time navigation, rapid identification of friends, accurate timing, location reporting and short message communication services.

Disadvantages of Beidou Satellite Positioning System over GPS Positioning System:

The Beidou satellite positioning system was built more than 20 years later than the GPS positioning system, and is at a disadvantage in terms of global coverage and market share.

Over the years, the Beidou system has been successfully applied to many fields such as surveying and mapping, telecommunications, water conservancy, fishery, transportation, forest fire prevention, disaster reduction and relief, and public safety.

Compared with the Beidou-2 regional system, the Beidou-3 service area will be expanded to the world, and at the same time, it has achieved breakthroughs in key technologies such as the upgrading and transformation of downlink navigation signals, realized a smooth transition with the Beidou-2 downlink navigation signals, and added new navigation signals on this basis to provide users with better services. The global coverage and full-time connectivity of the Beidou system will accelerate the arrival of the era of the Internet of Everything, and a new "Beidou+" production and lifestyle has begun to take shape.

Beidou + Traffic": real-time monitoring of the vehicle speed and route of dangerous goods transport vehicles, tourist buses, or long-distance buses to ensure driving safety; Speeding will be greatly reduced, and traffic accidents will be reduced;

Beidou + Water Conservancy": Beidou satellite navigation is used to measure the drift of the dam position, and the error is accurate to the millimeter level; If the drift value of the dam is too large, an early warning is given, which solves the problem that manual monitoring cannot be carried out under special disaster weather conditions, resulting in blind spots.

Beidou + precision agriculture": precision agriculture realizes the automatic driving instrument of agricultural machinery with the help of high-precision positioning of Beidou system, which can greatly improve the efficiency of agricultural machinery and reduce labor intensity;

Beidou + fishing boats": real-time monitoring of offshore operations, fishing boats can alarm at any time, and weather forecasts and early warning notices can be listened to at sea, Beidou has become a fisherman's mouth of the "clairvoyant", "tailwind" and "talisman" ......

Beidou + payment": It can accurately queue up hundreds of ** and ticket purchase applications within 1 second, and handle them in order; By accurately grasping the change of vehicle location and the length of time, it can quickly and accurately complete highway driving payment, parking fee in public places, and automatic charging and pricing of vehicles from the cloud.

Beidou + work": The police sit in the command center, and they can realize the accurate dispatch of patrol police vehicles and police forces through the Beidou mobile police system, so as to quickly dispatch the police and dispatch the police nearby; Farmers are doing housework at home and teasing their babies, and they can sow seeds and sprinkle medicine in the fields through Beidou drones; Herdsmen sit at home drinking milk tea and chatting, and they can graze sheep and cattle several kilometers away through ......the Beidou collar

The Beidou satellite navigation system is composed of three parts: space segment, ground segment and user segment, which can provide high-precision, high-reliability positioning, navigation and timing services for all kinds of users around the world around the clock and all day, and has the ability of short message communication, and has initially possessed regional navigation, positioning and timing capabilities, with a positioning accuracy of 10 meters, a velocity measurement accuracy of meters and seconds, and a timing accuracy of 10 nanoseconds.

The space segment of the Beidou satellite navigation system consists of 5 geostationary orbit satellites and 30 non-geostationary orbit satellites, and China plans to cover the Asia-Pacific region around 2012 and the world around 2020. China is implementing the construction of the Beidou Navigation Satellite System and has successfully launched 16 BeiDou navigation satellites.

According to the overall plan for system construction, around 2012, the system will first have the ability to cover positioning, navigation and timing, as well as short message communication services covering the Asia-Pacific region. Around 2020, the Beidou satellite navigation system covering the whole world will be built.