TJS 1 (Tongxin Jishu Shiyan) is a Chinese geostationary satellite billed as a communications technology test satellite, but which is likely a military SIGINT mission.
The satellite is repordedly mainly used to conduct a test on Ka-band in broadband communication. Also it has been reported, that it features a large unfulable dish antenna of ~32 m diameter. It has been positioned at 154.5° East.
The lack of public information has lead to the suspiction, that this satellite has a military mission. It has been speculated, that the satellite might be in fact a military Qianshao-3 SIGINT satellite.
TJS 1 was launched in September 2015 on a CZ-3B/G2 rocket.
A second sarellite of this type, TJS 4 (Tongxin Jishu Shiyan), was launched in October 2019 into a geostationary transfer orbit.
Reportedly the satellite was built by CAST and is a technological demonstration of multi-band, high speed communication techniques. The launch animation showed a satellite featuring a deployable mesh antenna and a number of smaller antennas, hinting to a SIGINT mission.
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