IGS-Optical 5V & IGS-Radar 4

The IGS-Optical 5V (Intelligence Gathering Satellite) is a prototype for the third generation Japanese optical reconnaissance satellite. The satellite is operated by the Cabinet Satellite Information Center. The satellite serves both Japan's national defense and civil natural disaster monitoring. Reportedly, the satellite has a ground resolution of 40 cm and a design life of 2 years.

The IGS-Radar 3 and 4 (Intelligence Gathering Satellite), are the second generation of Japanese radar reconnaissance satellites. The satellite are operated by the Cabinet Satellite Information Center. The satellite serves both Japan's national defense and civil natural disaster monitoring. Reportedly, the satellite has a ground resolution of less than 1 m.