Yaogan series

China's expansive military ISR satellite constellation — optical, SAR, and ELINT triplets that form the space backbone of the PLA's anti-ship missile kill chain across the Western Pacific.

Overview

The Yaogan series is the People’s Liberation Army’s principal space-based intelligence, surveillance, and reconnaissance (ISR) system, blending electro-optical (EO) imaging, synthetic-aperture radar (SAR), and signals-intelligence payloads into one proliferated low-Earth-orbit constellation. Its most distinctive element is a set of co-orbiting ELINT triplets that mirror the US Naval Ocean Surveillance System (NOSS), designed to detect, identify, and geolocate surface vessels by their radio-frequency emissions. Open-source orbit trackers catalogue approximately 179 active Yaogan satellites as of late 2025, according to satellitemap.space, and the broader Chinese ISR architecture — which includes dedicated military comsats and experimental platforms — has grown to over 510 satellites per the US Department of Defense, making it the fastest-expanding reconnaissance fleet in the world.

Development

The program’s first satellite, Yaogan-1, lifted off on 26 April 2006, and the constellation has since grown through a sustained launch cadence that has logged 149 successful missions with a single failure by 2026, documented in the Wikipedia compilation of public Chinese space data. The early years saw a mix of optical and SAR satellites, while the naval-surveillance arm debuted in March 2010 with the first JB-8/Yaogan-9 series triplet. Through the 2010s and early 2020s, CASC-built spacecraft — assembled at the China Academy of Space Technology (CAST) and the Shanghai Academy of Spaceflight Technology (SAST) — filled out the Jianbing (“JB”) family, from the JB-5/-6 optical mappers to the JB-7/-10 SAR platforms. The most recent publicly noted launch, Yaogan-50-01 in January 2026, was highlighted by the U.S. Space Force as evidence of the constellation’s relentless expansion.

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