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Spacecraft flew hundreds of thousands to hundreds of millions of kilometers from the earth, injecting speed when the size and direction of a slight error, arrived at target planets will appear large deviation error, for example, when Mars probe injecting speed 1 m/s speed (about one over ten thousand), arrived at Mars, about 100000 km distance deviation. Therefore, precise control and navigation must be carried out during the long flight. Flying to the moon is usually controlled by the orbital control system of the ground and space probe (see orbit control). Interplanetary flight distances, radio signal transmission time is long, the real-time remote control, can't so planets and interplanetary spacecraft orbit control system shall have the ability of autonomous navigation (see interstellar travel navigation and control). The United States, for example, "pirates" spacecraft in space flight of more than eight hundred million km, for 11 months of 2000 times of autonomous orbit adjustment, the final surface to achieve a soft landing on Mars, placement accuracy up to 50 km. In addition, in order to ensure the accuracy of the orbit control engine, the communication antenna is always aimed at the earth, and other systems work normally, and the detector has the autonomous attitude control ability
The annual north American international auto show, formerly known as the Detroit international motor show, has a history of nearly a century and is one of the longest in the United States. Sponsored by the Detroit automobile dealers association. In November 1900, the New York U.S. auto club held the first world expo, ZhuanQian to Detroit in 1907, when the venue is located in the bei le beer garden, small exhibit to vendors only 17, but 33 vehicles. In 1957, the European automakers finally, to the ocean for the first time appeared the figure of Volvo, Benz, porsche, won the attaches great importance to the American people, "Wang Qi" official form of the Detroit auto show. From 1965 onwards, exhibition moved to Cobo convention and exhibition center. In 1989, the Detroit motor show was renamed the north American international auto show. The north American auto show has about forty or fifty new cars a year. Many people have been attracted to the show, except for their interest in cars, because the show is a big holiday gathering, eating, drinking and having fun
GPS systems for cars and trucks are incredibly useful since you can find out what your location is driving under the influence lost or find your car or truck whether or not this has been stolen. Parents will also be by using these GPS systems to hold tabs on new teenage drivers.
New Car Buying Tips--




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