The Mysterious World of Chinese Satellites: Unpacking the Enigmatic Movements of China’s Space Program

In recent years, the world of space exploration has witnessed a significant increase in satellite launches by countries like China. While these launches have been met with excitement and curiosity, they also raise important questions about the intentions behind them. A new analysis by the Center for Strategic and International Studies (CSIS) has shed light on the movements of 75 Chinese satellites in geosynchronous Earth orbit (GEO) over the past nine years.

The CSIS analysis was based on a mix of US Space Command data, Chinese-language media, and research literature. It pinpointed eight Chinese birds that have made frequent maneuvers and/or exhibited “unusual behavior” in the GEO belt, an orbital region where many high-value Western military and commercial communications satellites are stationed. The movements of these eight satellites were tracked and published on Space-Track.org, a public space object catalog maintained by the US Space Command’s 18th Space Defense Squadron.

Among the most striking features of the Chinese satellites’ behavior is their frequent movement in GEO. While many Western satellites follow predictable patterns of orbit, the Chinese satellites seem to be doing something different. The CSIS study found that these satellites exhibit distinct categories of movement, which they have termed “Larks,” “Skyliners,” “Drifters,” and “Inkspots.” Each category has its own unique characteristics and raises important questions about the intentions behind the Chinese satellites’ behavior.

The Lark category consists of satellites that move in a way that is consistent with communications operations. One example cited by the CSIS study is ChinaSat-20A, which was launched in 2010 and is now defunct. Despite being characterized as a “civil comsat” by Chinese state media, many Western analysts and NASA have concluded that it is more likely to be a military comsat. The CSIS study notes that China Satellite Communications Group Co., Ltd. does not list it among their satellite fleet providing services, and neither the firm nor the Chinese government has provided any details about its capabilities.

In contrast, the Skyliner category consists of satellites that exhibit frequent stair-step maneuvers throughout their lifetimes. These movements are similar to those of Russia’s Luch/Olymp satellites, which US and NATO officials have alleged are stalking Western satellites to eavesdrop. The CSIS study notes that it is difficult to verify whether these Chinese satellites are engaging in similar activities.

The Drifter category consists of satellites that move in slow, constant sweeps across a set longitudinal band. These movements are unlike those of any other satellite in GEO and raise important questions about the intentions behind them. The CSIS study suggests that one possible explanation for these movements is that the satellites are surveying all of the GEO satellites over Asia, possibly for intelligence or space situational awareness purposes.

Finally, the Inkspot category consists of satellites that exhibit movements that do not yet fit neatly into the other categories. One example cited by the CSIS study is SJ-25, which was launched in January 2025 and is designed to test and verify “satellite fuel replenishment and life extension service technology.” The satellite’s movements have been described as erratic and unpredictable, but it has also been observed rendezvousing with another satellite, SJ-21, in a maneuver that may be the first of its kind.

The CSIS study concludes by urging more study of Chinese satellite maneuvers and notes that a great deal of open-source information is available from Chinese-language sources and Chinese government publications. The findings of this analysis are significant not only because they shed light on the mysterious world of Chinese satellites but also because they raise important questions about the intentions behind these operations.

What do these movements mean for global security? How do they impact the ability of Western countries to communicate with each other in space? And what do they reveal about China’s military and intelligence capabilities? The answers to these questions are not yet clear, but one thing is certain: the world of space exploration is becoming increasingly complex and challenging.

As we continue to explore and utilize space, it is essential that we remain vigilant and informed about the activities of nations like China. The future of space exploration depends on it.

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