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Qualir Auto Electronics Co., LTD, founded in 1998, aims to Make car owners' drive with less effort and cosily by giving auto electronics of Quality and Reliability. In May 1998, Qualir developed and create Car CD, VCD Players and home CD,DVD Players. In March 2003, Qualir began to develop and create Car Mp3 players,Car DVD Players,and effectively developed Car DVD Players with Built-in GPS function in 2004. In June 2007, Qualir made a decision to create a platform for direct wholesale of Auto electronics. In September 2007, Qualir's wholesale Dept was successfully founded and our online wholesale store was finally completed.
To restore the original driving block method;
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
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