GPS is a positioning system led by the US Air Force, and it is a global satellite navigation system open to all users free of charge. GPS signals can be divided into military and civilian, in which military signals are used exclusively by the US military, and civilian signals are open to users all over the world free of charge. The switch of the GPS system is in the hands of the United States, which can amplify the signal error at any time, turn off the signal, and make millions of square kilometers of people and equipment suddenly "disappear".
For example,1On July 23rd, 1993, the United States accused China's cargo ship "Yinhe" of transporting chemical weapons raw materials to Iran and creating the "Yinhe" incident. On the same day, the GPS navigation equipment on the Galaxy suddenly failed and lost its navigation direction. It was not until the US military forcibly searched that the ship's GPS returned to normal.
This is why China has to spend huge sums of money on Beidou navigation system. As a national heavyweight such as satellite navigation system, China must own it, and cannot be faked, otherwise it will be controlled by others.
Since 201165438+February 27th, Beidou satellite navigation system has been gradually extended to transportation, meteorology, fishery, forestry, telecommunications, water conservancy, surveying and mapping and other application fields. Fishing boat shipping: In the South China Sea, about 70% of fishing boats are equipped with Beidou system. As we all know, there is no base station at sea, so there is no way to make a phone call. Scientific research ships generally have satellite phones, and maritime satellites will guarantee communication. But for fishermen, satellite phones are expensive, and fishermen usually lose contact and can't keep communication when they go out to sea.
Now, after the fishing boat is equipped with Beidou system, fishermen can report their safety to their families by sending text messages, and they can also contact the marine police directly for help in case of danger. Accurate timing: The hydrogen maser of Beidou system has high accuracy. What can you do with such high precision? In real life, even if the time difference on our mobile phone is one or two minutes, it will not have much impact on our lives. However, in industries related to the national economy and people's livelihood, such as the financial industry, if the settlement time in financial settlement differs by one millisecond, the settlement amount may differ by tens of millions of dollars;
In the power system, if the time and frequency of each region are not highly consistent, there may be peak overlap during the peak period of power consumption, resulting in power failure in the whole region. Earthquake relief: During the Wenchuan earthquake, all communication facilities could not be used due to natural disasters, and satellites were not affected by disasters in the sky and on the ground.
At that time, if the communication service in the disaster area was restored in time, it could be provided again in a day or two. However, we also know the 72-hour gold rescue, so 1 min 1 sec is very precious and cannot be wasted. The first message after the Wenchuan earthquake was sent by Beidou-1 terminal, which can provide navigation and communication services for emergency rescue in very critical and abnormal situations.
Beidou system provides the most basic spatio-temporal information service for people and vehicles, whether in the sky, in the ground or in the sea. To quote a famous saying of satellite navigation system industry, the application of satellite navigation application system is only limited by people's imagination! Therefore, if there is no Beidou, GPS paralysis is particularly serious. Now we should be proud of our Beidou global navigation system.