SJ-2
The announced missions of the three SJ-2 [Shi Jian - Practice] spacecraft launched on a single booster on 20 September 1981 included ionospheric and atmospheric studies. This cover story was frequently used by early American electronic intelligence satellites launched by the US Navy, and the mass and orbital parameters [200 by 1600 kilometer orbits at 59.4 degree inclination] of the SJ-2 spacecraft are consistent both with the announced missions as well as with ELINT applications.
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