軍ぐん事じ衛えい星せい

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Meanings

1

noun

military satellite

A satellite used for military purposes such as reconnaissance, communication, or navigation.

army, force, troops

事matter, thing, fact

衛defense, protection

星star, spot, dot

人じん工こう衛えい星せい
人工衛星 is a general term for any artificial satellite, while 軍事衛星 specifically refers to military-purpose satellites.
偵てい察さつ衛えい星せい
偵察衛星 is a reconnaissance satellite, a type of military satellite used for intelligence gathering.

Compound of 軍事 (military) and 衛星 (satellite).