At 9:23 on September 15, 2020, China’s Long March 11 carrier rocket was launched, and jilin-1 high score 03-1 satellites were successfully put into 535 km solar synchronous orbit through “one arrow and nine satellites”. The GF 03-1 group of “jilin-1” consists of three video imaging mode satellites and six push broom imaging mode satellites. Among them are the “central video” satellite and the “Bili Bili video satellite” that the children have been looking forward to. Indeed, the Long March 11 launch vehicle was launched in the Yellow Sea. This is the second time that China has successfully carried out the sea launch mission, and it is also the first time that the maritime commercial application launch is carried out in a real sense. In geography, there is a word called “location condition”, which refers to the conditions, characteristics and attributes of an area. It is a comprehensive concept including natural resources, geographical location, economy, science and technology, politics, culture and so on. To build a space launch site, the location conditions to be satisfied are generally: low latitude, sparsely populated, flat terrain, wide vision, suitable climate and meteorological conditions, and sometimes ensuring that there are no large cities or important projects in the active phase of the launch direction. It is believed that many people know that China has four major space launch sites, namely Jiuquan, Xichang, Taiyuan and Wenchang, which have witnessed the vigorous development of China’s space industry for more than half a century. Generally speaking, the offshore launch platform is closer to the low latitude area near the equator. The rocket can make full use of the additional speed of the earth’s rotation on the equator, thus saving fuel and improving the carrying capacity. < / P > < p > after the rocket takes off for a period of time, the “debris” such as booster will fall off. The worst case is that the launch fails, and the rocket falls down. However, there is a small population around the offshore launch platform, which ensures the safety to a large extent. < / P > < p > the offshore launch platform is easier to move on a large scale and has good mission adaptability. It can meet the launch requirements of different orbital payloads by flexibly selecting the launching point and landing area. < / P > < p > it has a total length of nearly 160 meters, a width of nearly 40 meters, a load of about 20000 tons, and a speed of more than 20 kilometers per hour. It is propelled by all electric power and has the function of rapid load adjustment. Of course, in addition to the above advantages, sea launch is inevitably faced with some influencing factors. Compared with the land, the marine launch site is more affected by the sea state and other natural environment. < / P > < p > on June 5, 2019, the Long March 11 launch vehicle realized “seven satellites with one arrow” in the Yellow Sea by sea launch, and China’s first sea launch technology test of solid carrier rocket was successful. < p > < p > in this test, the Long March 11 sea launched solid launch vehicle was used, and the civil ship was used as the launching platform. The management mode of China’s maritime launch was explored and the maritime launch capability was verified. On September 15, the Long March 11 launch vehicle launched by sea again completed its launch mission at the “Oriental space port” located in Haiyang, Shandong Province (subordinate to Yantai City). On July 30, 2019, shortly after China’s first sea launch technology test, the construction project of China’s first maritime launch home port, Dongfang space port, was launched. < / P > < p > we have to mention a company, sea launch, the only one in the world that provides sea based launch services. In 1995, Boeing company of the United States, Ukraine Southern Company, Russian energy research and production company and Norway kewerner company jointly established sea launch. The first commercial satellite was launched on October 9, 1999. After that, the payloads of the launch vehicles launched by the company were basically communication satellites. In this regard, Elon Musk, SpaceX CEO, explained on twitter that the launch site should be far enough away from land to avoid disturbing people when launching and landing. SpaceX may also test fly the spacecraft with the help of a sea launch pad within 2-3 years. Global Tech

By ibmwl