What kind of satellite is the "Yinhe 3" rocket launched by North Korea? Whether it is an application satellite, a technical test satellite or a scientific satellite.

Yinhe-3 carrier rocket is a launch vehicle independently developed by North Korea, with a height of 30 meters and a diameter of 2.4 meters. The launch weight is 9 1 ton, and the initial thrust of the rocket is 120 ton. Both thrust and range exceed the previous North Korean launch vehicle. The satellite successfully launched this time is the "Light Star 3" satellite independently developed by North Korea, which is an earth observation satellite operating in polar orbit. Is it an application satellite, a technical experimental satellite or a scientific satellite according to the purpose? Let's listen to what North Korean and South Korean experts think:

North Korean scientists and technicians introduced the satellite light star No.3 to be installed on Yinhe No.3 (Taepodong No.2) to foreign journalists at the Dongcangli launch site in Tieshan County, North Pyongan Province. A related person from the South Korean government said that Light Star 3 "can hardly be regarded as a practical satellite. No country in the world has spent hundreds of millions of dollars to launch rockets to put such a rough satellite into orbit. " Picture = Reuters, Yonhap News Agency? Aerospace experts believe that only according to the performance parameters announced by North Korea, it can be known that Light Star 3 is a first-class experimental satellite, which is different from North Korea's statement. The scientific experimental satellite "Woxing 3" launched by Korea 1999 weighs 1 10 kg and has a service life of 5 years. Practical satellites are so heavy because they are loaded with commercial high-priced equipment as much as possible in consideration of launch costs. Zhao Guang said: "The cost of satellite 1 kg is only 25,000 to 40,000 dollars. If it is not economical, it is often launched with other commercial satellites. "

According to the calculation of the relevant departments in South Korea, the launch cost of Gwangjing-3, excluding the construction cost of Dongcangli launch site ($400 million) and satellite production cost ($65.438+$500 million), reached $300 million. In other words, the launch cost per kilogram is $3 million. North Korea said that the satellite's life span is two years, which also proves that the light star 3 is not a practical satellite. A person from a national research institute said: "It cannot be said that it is not a practical satellite with a life span of two years. But considering that the cost is usually designed for more than 5 years, this is common sense. "

The general view in Korean scientific and technological circles is that considering the appearance and performance parameters of Light Star 3, its function may be limited to shooting simple images and playing the songs of General Kim Il Sung. A government official said: "No country in the world has spent hundreds of millions of dollars to launch a 92-ton rocket and put such a crude satellite into orbit." This shows that the purpose of launching Light Star 3 is to test the performance of the rocket (which can be transferred to a long-range missile), not to put the satellite into orbit.

Attached with the parameters of bright star three:

It has a mass of 65,438+000 kilograms and runs in a sun-synchronous orbit with a height of 500 kilometers. The life span of this satellite is two years. Install the camera.

Use:

Determine the distribution of mountain forest resources, natural disasters, grain yield estimation, etc. In North Korea, collect the information needed for weather forecast and resource exploration.

Booster rocket:

Name: Yinhe No.3

Tall? 30 meters

Diameter? 2.4 meters

Launch weight? 9 1 ton

Initial thrust? 120 ton