The Queqiao-2 satellite has recently completed in-orbit communication tests, with its platform and payloads working normally, according to the China National Space Administration (CNSA) on Friday.

"The functions and performance of Queqiao-2 meet mission requirements, and it can provide relay communication services for the fourth phase of China's lunar exploration project and future lunar exploration missions of China and other countries," said the CNSA.

Queqiao-2 will be used as a communications bridge between the ground operations on earth and upcoming lunar probe missions on the far side of the moon until at least 2030.

Queqiao-2 researcher and developer Xiong Liang described the satellite as "the main switch" of the whole fourth phase of lunar missions, according to state television CCTV.

"Only when the main switch is flipped on, all the communications can kick off," Xiong said.

The satellite successfully completed a communication test on April 6 with Chang'e-4, which is now carrying out an exploration mission on the far side of the moon. From April 8 to 9, it conducted communication tests with the Chang'e-6 probe, which is yet to be launched.

Queqiao-2 was launched on March 20 and entered its target highly elliptical orbit on April 2 after midway correction, near-moon braking and orbital maneuver around the moon.

Two communication and navigation technology test satellites, Tiandu-1 and Tiandu-2, were sent into space together with Queqiao-2 and are now conducting a series of tests on communication and navigation technology.

The landing and sample collection sites of China's moon missions in the coming years are mainly in the lunar south pole region or on the far side of the moon. A more powerful relay satellite with more functions is necessary to provide communications and data transmission services for the missions. (Xinhua)