Close

At the heart of the remote sensing industry

Remote Sensing Technology Center of Japan

Japanese
公式Facebookページ公式Facebookページ

Solution

About ALOS-2

About

The Advanced Land Observing Satellite-2 (ALOS-2) is follow-on mission from the “DAICHI”, which contributed to cartography, regional observation, disaster monitoring, and resource surveys. ALOS-2 will succeed this mission with enhanced capabilities.
Specifically, JAXA is conducting research and development activities to improve wide and high-resolution observation technologies developed for DAICHI in order to further fulfill social needs.

Characteristics

  1. Disaster monitoring of damage areas, both in cosiderable 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-2 (PALSAR-2) aboard ALOS-2, which is an active microwave radar using the 1.2GHz frequency range, will, in responding to society’s needs, have enhanced performance compared to DAICHI/PALSAR. The PALSAR-2 is capable of observing day and night, and in all weather conditions.

Precise diagnosis of the earth using “L-band SAR” Japanese advanced technology

ALOS-2 will have a spotlight mode (1 to 3m) and a high resolution mode (3 to 10m), whilst PALSAR has a 10m resolution. It will allow comprehensive monitoring of disasters by providing users with more detailed data than DAICHI/PALSAR.
The observation frequency of ALOS-2 will be improved by greatly expanding the observable range of the satellite up to about 3 times, througe an improvement in obserble areas (from 870km to 2,320km), as well as giving ALOS-2 a right-and-left looking function, currently not available on DAICHI/PALSAR.

Specs

Sensor SAR
PALSAR-2(Frequency) L-band (1.2 GHz band)
Observation mode Spotlight Resolution:1×3m
Swath:25km
Strip Map Resolution:3m~10m
Swath:50km,70km
ScanSAR Resolution:60~100m
Swath:350km
Design life 5 years (target: 7 years)
Satellite mass Approx. 2,100 kg
Mission data transmission Direct transmission, and via data relay satellite
Launch date 24 May 2014
Launch vehicle H-IIA launch vehicle No. 24

Observation Modes

Observation
Mode
Range
Resolution
Azimuth
Resolution
Scene
Size
Polarimetry
Spotlight 3.0m 1.0m 25km x 25km Single (HH or HV or VH or VV)
Ultra-Fine 3.0m 3.0m 55km x 70km Single (HH or HV or VH or VV)
Dual (HH + HV or VH + VV)
High-sensitive 6.0m 4.3m 55km x 70km Single (HH or HV or VH or VV)
Dual (HH + HV or VH + VV)
Fine 9.1m 5.3m 70km x 70km Single (HH or HV or VH or VV)
Dual (HH + HV or VH + VV)
High-sensitive (Full Polarimetry) 5.1m 4.3m 30km x 70km Quad (HH + HV + VH + VV)
Fine (Full Polarimetry) 8.7m 5.3m 30km x 70km Quad (HH + HV + VH + VV)
ScanSAR nominal (28Mhz) 47.5m (5 look) 77.7m (3 look) 350.5km x 355km Single (HH or HV or VH or VV)
Dual (HH + HV or VH + VV)
ScanSAR nominal (14Mhz) 95.1m (5 look) 77.7m (3 look) 350.5km x 355km Single (HH or HV or VH or VV)
Dual (HH + HV or VH + VV)
ScanSAR wide (490km) 44.2m (2 look) 56.7m (1.51 look) 489.5km x 355km Single (HH or HV or VH or VV)
Dual (HH + HV or VH + VV)

※ The values are defined at the incidence angle of 37 degrees.