About ALOS-2

Advanced Land Observing Satellite-2 "DAICHI-2" (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
25kmx25km
Single (HH or HV or VH or VV)
Ultra-Fine
3.0m
3.0m
55kmx70km
Single (HH or HV or VH or VV)
Dual (HH + HV or VH + VV)
High-sensitive
6.0m
4.3m
55kmx70km
Single (HH or HV or VH or VV)
Dual (HH + HV or VH + VV)
Fine
9.1m
5.3m
70kmx70km
Single (HH or HV or VH or VV)
Dual (HH + HV or VH + VV)
High-sensitive (Full Polarimetry)
5.1m
4.3m
30kmx70km
Quad (HH + HV + VH + VV)
Fine (Full Polarimetry)
8.7m
5.3m
30kmx70km
Quad (HH + HV + VH + VV)
ScanSAR nominal (28Mhz)
47.5m (5 look)
77.7m (3 look)
350.5kmx355km
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)
350.5kmx355km
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)
489.5kmx355km
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.

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