On October 9, with the efforts of the flight control team of China’s first Mars exploration mission, tianwen-1 successfully completed its deep space maneuver. At this point, the flight orbit of the probe becomes an orbit that can be accurately captured by Mars and intersects with Mars accurately. Up to now, tianwen-1 has been flying for more than 78 days and is more than 29 million kilometers away from the earth. For China’s first Mars exploration mission, this deep space maneuver is of great significance. < / P > < p > deep air maneuver refers to an orbit change maneuver implemented in the ground fire transfer section. Experts from the Mars Orbiter team of the eighth Academy of China Aerospace Science and technology group told reporters that the original flight speed and direction of the probe can be changed through deep space maneuver, so that it can successfully fly to Mars along the orbit after orbit change. According to experts, deep space maneuver is the result of joint optimization of launch vehicle’s orbit entry trajectory and ground fire transfer orbit, which can improve the launch capability of the carrier rocket, increase the launch quality of the detector, and enable the detector to carry more propellant to better complete the detection task. < p > < p > previously, tianwen-1 has completed two half-way orbit corrections. Experts said that different from the conventional midway correction with small speed increment and short engine operation, during the deep space maneuver, the probe changed from an escape transfer orbit launched into orbit to an orbit that accurately arrived at Mars, with large speed increment and long engine working time, which put forward extremely high requirements for the control and propulsion system of the probe. < / P > < p > to carry out deep space maneuver mission, the flight control team should formulate the deep space maneuver orbit change strategy according to the scheduled time to Mars, orbit parameters and real-time measurement and control orbit determination parameters, and complete the corresponding attitude and orbit control of the probe, so as to ensure that the probe is in the orbit accurately intersecting with the fire star after deep space maneuver. < / P > < p > “tianwen-1 is running, the earth is running, and Mars is running. At present, “tianwen-1″ is more than 29 million kilometers away from the earth, and the time delay between us is relatively large. Therefore, many actions have to be designed in advance and completed by the detector itself. All of these are difficult and challenging. ” Zhang Yuhua, deputy chief commander of tianwen-1 probe, China’s first Mars exploration mission, said. < / P > < p > in order to complete the precise orbit determination of ground-based TT & C and the precise and autonomous orbit control on the detector, the orbit determination task of the ground to the detector was jointly completed by China’s deep space TT & C station and the observatory, which accurately ensured the precise orbit determination requirements of the detector’s orbit change. In order to control the orbit accurately and autonomously, the Mars Orbiter is equipped with a computer capable of fault identification and autonomous processing, which fully ensures the accuracy and reliability of orbit control. < / P > < p > it is reported that through the use of deep space maneuver for orbit design and orbit control, not only has the propellant carrying capacity of the detector been increased, but also three objectives have been achieved. First of all, deep space maneuver decomposes a large acquisition speed increment into two relatively small speed increments, which is conducive to reducing the single engine working time and ensuring the reliability of the engine. At the same time, the implementation of deep space maneuver is conducive to the calibration of 3000n engine. In the process, the thrust and specific impulse of 3000n engine can be calibrated, and accurate engine calibration parameters can better ensure the accuracy of Mars capture. < / P > < p > in addition, through deep space maneuver, the Mars Orbiter development team of the eighth Institute of research and development of the Mars Orbiter has optimized the arrival time of the probe, which can obtain more favorable lighting conditions and communication conditions at the capture point, and shorten the fire shadow time (the probe enters the shadow area covered by too much sunlight by Mars) and the communication blind area. After 12 years, “world class Super project” Shantou Bay Tunnel ushers in a historic breakthrough today

By ibmwl