Utilizing Space Through Satellites Advanced Land Observing Satellite-3 (ALOS-3)

Under Development

About Advanced Land Observing Satellite-3

Achieving improved optical observations of wide-swath with high-resolution as successor of optical mission of ALOS

Advanced Land Observing Satellite-3 is a successor of the optical mission of Advanced Land Observation Satellite (ALOS). The new satellite will achieve improved ground resolution (0.8 m) while observing a wide -swath (70 km) by a larger sensor with higher performance compared to DAICH, and continuously observe not only Japan but also global land areas to construct a system that can swiftly and timely acquire, process and distribute image data. ALOS-3 will be instrumental in providing with the nation and the local government data collected before and in times of disaster,which equips them to respond promptly.
Observation data acquired by the satellite is also expected to be useful in various fields such as contributing to the maintenance and updates of precise geospatial information in Japan as well as developing countries, and research and applications on coastal and land environmental monitoring by its observation capabilities.

Characteristics of Advanced Land Observing Satellite-3

Attaining both “wide-swath” and “high-resolution”

The optical sensor onboard ALOS-3 will improve its ground resolution by approx. three times from that of DAICHI (2.5 to 0.8 m at nadir) while maintaining a wide-swath of 70 km at nadir. Such a high-resolution sensor with a wide-swath is a unique characteristic of the sensor, which is achieved using maximize our accumulated knowledge and manufacturing technology for a large optical system and a high resolution detector.

Images: Around JAXA Tsukuba Space Center, Ibaraki Pref., Japan
left: ALOS 2.5-m resolution
right: ALOS-3 0.8-m resolution (Simulated image)

Various observation functions to meet various needs

ALOS-3 can normally perform observation covering a wide area of 70 km in width and 4000 km in along-track direction as the strip-map observation mode. In addition, the satellite has also capable following observation functions, and the acquired image data is expected to be useful in various application fields.

[Stereoscopic observation mode]

Acquire stereo-pair image at a certain ground point from two different directions.

[Wide-area observation mode]

Covering a wide-area of 200 km (in along-track direction) x 100 km (in cross-track direction) in an orbit path. by satellite’s single orbital passage.

[Observation direction changing mode]

Changing observation direction from satellite nadir.
The satellite can be observed any given point in Japan within 24 hours after receiving the request by the pointing capability up to 60 degrees in all direction against the satellite nadir.

Major Characteristics

Mission instrument Wide-swath and high-resolution optical imager
  • Panchromatic band (black and white)
    70km / Ground resolution: 0.8 m / Swath width: 70km at nadir
  • Multi-band (color)
    Ground resolution: 3.2 m / Swath width: 70km at nadir
    Band 1 0.40~0.45μm (Coastal)
    Band 2 0.45~0.50μm (Blue)
    Band 3 0.52~0.60μm (Green)
    Band 4 0.61~0.69μm (Red)
    Band 5 0.69~0.74μm (Red Edge)
    Band 6 0.76~0.89μm (Near-Infrared)
Data transmission method Direct transmission to the ground
Optical data transmission . the optical data relay sate
Size 5.0m×16.5m×3.6m (after the solar paddle deployed)
Mass Approx. 3 tons
Design life Over 7 years
Operational orbit Sun-synchronous subrecurrent orbit at an altitude of 669 km
Revisit time 35 days (Sub-cycle: about 3 days)
Local solar time at descending node: 10:30 (a.m.) +/- 15 minutes