Let s take a closer look at China s Beidou positioning system

The Beidou Navigation Satellite System (CNSS) is a global satellite positioning and communication system (CNSS) developed by China, and is the third mature satellite navigation system after the Global Positioning System (GPS) of the United States and GLONASS of Russia. That is, the "Chinese version" of GPS, which provides high-precision and high-reliability positioning, navigation and timing services for all kinds of users.

In November 2012, 16 Beidou satellites were successfully launched; By 2020, China will build the Beidou Global Navigation and Positioning Satellite System, and the space segment will include 5 geostationary orbit satellites and 30 non-geostationary orbit satellites.

The 24 GPS satellites orbit the Earth at an altitude of 20,200 kilometers above the ground in a 12-hour cycle, so that more than four satellites can be observed at any point on the ground at any time and at any time. Because the position of the satellite can be accurately known, in GPS observation, we can get the distance from the satellite to the Beidou locat, using the distance formula in the three-dimensional coordinates, using three satellites, we can form three equations to solve the position of the observation point (x, y, z). Considering the error between the clock of the satellite and the clock of the receiver, there are actually 4 unknowns, x, y, z and clock difference, so it is necessary to introduce the fourth satellite and form 4 equations to solve it, so as to obtain the latitude and longitude and elevation of the observation point.

In fact, the Beidou reporting terminal can often lock more than 4 satellites, at this time, the Beidou reporting terminal can be divided into several groups according to the constellation distribution of satellites, each group of 4, and then select the group with the smallest error through the algorithm for positioning, so as to improve the accuracy.

Due to the errors in the orbit and satellite clock, the influence of the atmospheric troposphere and ionosphere on the signal, and the artificial SA protection policy (cancelled on May 1, 2000), the positioning accuracy of the civilian GPS is only 100 meters. In order to improve the positioning accuracy, differential GPS (DGPS) technology is widely adopted, and a base station (differential station) is established for GPS observation, and the precise coordinates of the known base station are used to compare with the observed value, so as to obtain a correction and release it to the public. After receiving the correction, the Beidou locator compares it with its own observations, eliminates most of the errors, and obtains a relatively accurate position.

Experiments show that the positioning accuracy can be improved to 5 meters by using poor GPS.

There are always stars shining in the vast starry sky, and at the same time, some of them may be real stars, and some of them may just be artificial satellites. These artificial satellites were also developed by scientists with a lot of time, material and financial resources, and their development was also for the benefit of human life. To a certain extent, it has brought a lot of convenience to our lives, so many people will also express doubts, what is the difference between the Beidou navigation system and the Beidou positioning system?

Which one is more suitable for civilian use? Let's talk about it with you. <>

First of all, in terms of function, there is a big difference between the two. The main function of the Beidou satellite is navigation, so to a certain extent, we go to a strange environment, and if we don't know the way, we can navigate. It will give you a complete route to search and provide you with a lot of convenience.

The Beidou positioning system, its main function is to give you a real-time positioning, if you and your friends are in two unfamiliar environments. But the two of you don't know each other's directions, so you can use the positioning function at this time, and then at this time the real-time location will be sent to the other person. <>

Secondly, in contrast, the Beidou navigation system is more suitable for civilian use, because in our daily life, we may encounter a lot of unfamiliar environments, and we don't know what the road ahead is. At this time, navigation is a very necessary function, when we don't know what is going forward, we can open the navigation and provide us with a complete route. Therefore, Beidou navigation is more suitable for civilian use, and positioning, it can only provide a real-time positioning, and will not provide a complete route, so at this time it will also add some trouble, can not play a role in solving the problem.

All in all, the Beidou positioning system and the Beidou navigation system provide a lot of convenience for our lives to a certain extent. They are also a high-tech product developed by scientists, so to a certain extent, they are also for the benefit of our human life. I hope it will be helpful to you.

First of all, the Beidou satellite is the satellite that we often see in the news reports launched into space, it is the most important equipment to provide space geographical location, Beidou navigation is installed in a variety of equipment and instruments, including ships, aircraft, missiles, mobile phones, car navigation devices inside the chip, it is used to receive satellite signals to determine the precise latitude and longitude, altitude and other data of the navigation software. Beidou navigation is more suitable for the early use of rock sparrows.

The main function of the Beidou satellite is navigation, the main function of the Beidou satellite is navigation, in contrast, the Beidou navigation system is more suitable for civilian use, because in our daily life, we may encounter a lot of unfamiliar environment, and do not know how the road ahead is.

Maps support Beidou, but mobile phones are also needed, and almost all domestic mobile phones support Beidou. For example, like Huawei, Xiaomi, etc., will indicate that it supports GPS, Beidou, Gnass, Galileo, etc., while Apple will write that it supports GPS, GNSS, and GNSS is a combination of all navigation systems in the world.

The mobile phone supports navigation by the baseband chip to decide, and the baseband chip is determined by receiving the frequency of wireless signals, at present, when receiving these wireless signals, basically includes all the frequency bands of satellite navigation, plus navigation is actually one-way communication, so the mobile phone supports all navigation systems.

At present, the commonly used maps support Beidou, but they also need to be supported by mobile phones, and almost all domestic mobile phones support Beidou. Samsung partially supports. Apple has been reluctant to use Beidou satellites until now.

In China, Beidou is basically preferred, and other satellites are rarely used, unless the mobile phone does not support it.

1. Beidou belongs to the satellite positioning system.

2. The Beidou Satellite Positioning System is a regional guide model charter positioning system established by China.

3. The system consists of three (two working satellites, one backup satellite) Beidou positioning satellite (Beidou-1), the ground control center as the main ground part of the code, and the Beidou user terminal.

4. The Beidou positioning system can provide users with all-weather, 24-hour real-time positioning services, and the positioning accuracy can reach tens of nanoseconds (ns) synchronization accuracy, and its accuracy is equivalent to GPS.

5. The Beidou-1 navigation satellite is researched and manufactured by the China Academy of Space Technology.

<><3. Enter Beidou navigation in the input box and click to get, as shown in the figure below

<>6. Click on the layer on the right and select the place you need to find, as shown in the figure below

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.