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The Deep Space Exploration Laboratory released news on April 13 that as of the 12th, the Tiandu-1 and Tiandu-2 communication technology test satellites had successfully carried out high-reliability transmission and routing of the moon and the earth, and lunar orbit navigation space benchmark allogeneic calibration. Waiting for new technology trials. Calculation results based on telemetry data show that the test project can effectively improve the accuracy of spacecraft orbit determination around the moon, and the test design has important practical value.
After Tiandu-1 and Tiandu-2 were launched on March 20, after about 14 days of space flight, including mid-course correction, near-month braking, and orbital maneuvering around the moon, the double-star combination was launched on April 3. Successful separation of binary stars in mission orbit around the moon.
China's Deep Space Exploration Laboratory announced on April 13 that as of the 12th, the Tiandu-1 and 2 communication technology test satellites have successfully carried out new technology tests such as high-reliability transmission and routing from the moon to the ground, and heterologous calibration of lunar orbit navigation space datum. The results of telemetry data show that the experimental project can effectively improve the accuracy of orbit determination around the moon, and the experimental design has important practical value.
After the launch of Tiandu-1 and Tiandu-2 on March 20, after about 14 days of space flight, the binary satellite combination successfully carried out the binary separation in the orbit of the circumlunar mission on April 3 after about 14 days of space flight.
On April 3, 2024, the binary star combination successfully separated the binary stars. Tiandu-1 image clip taken by Tiandu-2
On April 8, Tiandu-1 completed the flight orbit adjustment control as planned, and flew in formation with Tiandu-2 in a frozen orbit around the moon, with the distance between the two stars maintained at around 200 kilometers. The communication between the two satellites is normal, the posture is stable, and the energy is balanced, laying an important foundation for carrying out a series of communication technology test tasks.
On April 3, 2024, the binary star combination successfully implemented the binary separation. Image clip of Tiandu-1 taken by Tiandu-2
On April 8, Tiandu-1 completed the flight orbit adjustment control as planned, and flew in formation with Tiandu-2 in a large elliptical frozen orbit around the moon, and the distance between the two satellites was maintained at around 200 kilometers. The two-satellite communication is normal, the attitude is stable, and the energy balance is balanced, which lays an important foundation for carrying out a series of communication and conduction technology test tasks.
On April 8, 2024, Tiandu-2 took a photo of the Earth and the Moon. Moon imaging data in the far-infrared spectrum with a wavelength of 8~14 um. The smaller celestial body in the background is the Earth.
Tiandu 1 and 2, as the first satellites developed by the Deep Space Exploration Laboratory, carried out a series of new lunar communication and navigation tests, effectively verifying the key technologies related to lunar communication, and will provide the basis for the subsequent International Lunar Research Station and Queqiao Communication Provide strong support for the design and construction of remote integrated constellation systems.
On April 8, 2024, Tiandu-2 took a group photo of the Earth and the Moon. Lunar imaging data in the far-infrared spectral band with a wavelength of 8~14 um, and the smaller celestial body in the background is the Earth
Tiandu-1 and Tiandu-2, as the first satellites developed by the Deep Space Exploration Laboratory, have carried out a series of new lunar communication and navigation technology tests, effectively verifying the key technologies related to lunar communication, and will provide strong support for the design and construction of the follow-up international lunar scientific research station and the Queqiao communication and navigation remote integrated constellation system.
Queqiao Telecom Comprehensive Constellation System
Since one side of the moon always faces away from the earth, a probe landing on the back of the moon is blocked by the moon itself and cannot directly achieve measurement and control communication and data transmission with the earth. The landing detection and sampling sites for the fourth phase of the lunar exploration project are mainly located in the south pole and far side of the moon. Therefore, relay stars with wider functions and stronger performance are needed to set up a new "relay communication station" from the moon to the earth. , to solve the communication and data transmission problems between the probe on the back of the moon and the earth.
On the eighth China Space Day in 2023, the two Queqiao communication technology test satellites were officially named "Tiandu-1" and "Tiandu-2". The "Tiandu-1" satellite weighs 61 kilograms and is equipped with Ka dual-band integrated communication devices, laser corner reflectors, space routers and other loads.
Queqiao communication and remote integrated constellation system
Since the moon always has its back to the earth, the probe landing on the far side of the moon is blocked by the moon itself and cannot directly realize the TT&C communication and data transmission with the earth. The missions of the fourth phase of the lunar exploration project are mainly located at the south pole of the moon and the far side of the moon, so it is necessary to set up a new "relay communication station" from the moon to the ground to solve the communication and data transmission problems between the probe on the far side of the moon and the earth.
On the eighth China Space Day in 2023, the two Queqiao communication and guidance technology test satellites were officially named "Tiandu-1" and "Tiandu-2". The whole satellite weighs 61 kilograms and is equipped with a Ka dual-band integrated communication machine, a laser corner reflector, a space router and other payloads.
Schematic diagram of the flight of the Tiandu Navigation Technology Test Star.
According to the planned goals, after the two stars "Tiandu 1" and "Tiandu 2" entered the earth-moon transfer orbit together with the Queqiao 2 lunar relay satellite, the two stars performed near-month braking and entered a large elliptical orbit around the moon. , in a large elliptical orbit around the moon, using satellite-to-ground laser ranging, inter-satellite microwave ranging and other methods to carry out high-precision lunar orbit determination technology verification.
The Deep Space Exploration Laboratory is a new technology research and development institution jointly established by the National Space Administration, Anhui Province, and the University of Science and Technology of China. Chen xiao, commander-in-chief of Tiandu Navigation Technology Experimental Satellite of the Deep Space Exploration Laboratory, said that these two small and micro test satellites will provide strong reference and basis for the subsequent establishment of China's Queqiao Navigation and Telecommunications Comprehensive Constellation System.
Schematic diagram of the flight of the Tiandu navigation technology test star.
According to the planned objectives, after the two satellites "Tiandu-1" and "Tiandu-2" enter the Earth-Moon transfer orbit together with the Queqiao-2 lunar relay satellite, the two satellites will carry out near-moon braking and enter the large elliptical orbit around the moon.
The Deep Space Exploration Laboratory is a new scientific and technological research and development institution jointly established by the China National Space Administration, Anhui Province and the University of Science and Technology of China. Chen Xiao, commander-in-chief of the Tiandu Communication and Guidance Technology Test Satellite of the Deep Space Exploration Laboratory, said that the two small and micro test satellites will provide a strong reference and basis for the subsequent establishment of China's Queqiao communication and remote integrated constellation system.