ALOS-2 Project / ALOS-2 Overview

The Advanced Land Observing Satellite-2 (ALOS-2, "DAICHI-2") is a follow-on mission from the ALOS "Daichi". ALOS has contributed to cartography, regional observation, disaster monitoring, and resource surveys, since its launch in 2006. ALOS-2 will succeed this mission with enhanced capabilities.

JAXA conducted research and development activities for ALOS-2 to improve wide and high-resolution observation technologies developed for ALOS in order to further fulfill social needs. These social needs include: 1) Disaster monitoring of damage areas, both in considerable detail, and when these areas may be large 2) Continuous updating of data archives related to national land and infrastructure information 3) Effective monitoring of cultivated areas 4) Global monitoring of tropical rain forests to identify carbon sinks.

The state-of-the-art L-band Synthetic Aperture Radar (PALSAR-2) aboard ALOS-2 will have enhanced performance compared to ALOS/PALSAR. The PALSAR-2 is capable of observing day and night, and in all weather conditions.
The ALOS-2 was launched by the H-IIA Launch Vehicle on May 24, 2014.

ALOS-2 Overview Figure
ALOS-2 Specifications
Orbit Type Sun-synchronous sub-recurrent orbit
Altitude 628km above the equator
Inclination angle 97.9°
Local sun time 12:00±15min at descending node
Revisit cycle 14 days
Shape 3.5m×3.2m×4.5m (Launch Configuration)
16.5m×3.7m×9.9m (On-orbit Configuration)
Mass Approx. 2100kg
Life time 5years (target: 7years)
Power Generated power Approx. 5300W (EOL)
Battery Li-ion battery: 200Ah
Duty ratio 50% (49min.)
Mission data downlink Direct transmission (max. 800Mbps) or
via Data Relay Satellite (278Mbps)
Data recorder 128GByte (EOL)
Mission instruments L-band Synthetic Aperture Radar (PALSAR-2)
Launch Launch date May 24, 2014
Launch vehicle H-ⅡA launch vehicle #24