ALOS4

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Overview

Advanced Land Observing Satellite-4 (ALOS-4)

The Advanced Land Observing Satellite-4 (ALOS-4) is a successor of the SAR mission of ALOS and ALOS-2. ALOS-4 will be equipped with the phased array type L-band synthetic aperture radar (PALSAR-3).

The observation swath of ALOS-4 will be drastically increased from 50 km (ALOS-2) to 200 km while keeping the high resolution.

Specifications

Launch Date July 1, 2024, 12:06:42 (JST) by the third H3 Launch Vehicle (H3 F3; Flight No. 3)
Orbit Same orbit as ALOS-2
  • Sun-synchronous sub-recurrent orbit
  • Altitude: 628km
  • Inclination angle: 97.9 degree
  • Local sun time at descending: 12:00 ± 15min.
  • Revisit time: 14 day (15-3/14 rev/day)
Life time 7 years
Size X 10.0m x Y 20.0m x Z 6.4m
Satellite Mass Approx. 3,000 kg
Downlink

Direct Transmission: 1.8/3.6 Gbps (Ka-band)

Optical Inter-orbit Communications: 1.8 Gbps
Mission Instruments

Phased Array type L-band Synthetic Aperture Radar-3 (PALSAR-3)

SPace based AIS Experiment 3 (SPAISE3)
Coverage of 1 repeat cycle (14days)
ALOS-4 PALSAR-3(200km)
ALOS-4 PALSAR-3(200km)
ALOS-4 PALSAR-2(50km)
ALOS-2 PALSAR-2(50km)