Space Programs | FORMOSAT-5


The basic characteristics of FORMOSAT-5 are similar to FORMOSAT-2 and shown below.

Characteristic Description
Category Remote sensing satellite
Weight About 450 kg (including payload and fuel)
Dimension Hexagonal, 2.8 m height, 1.6 m OD
Orbit altitude 720 km, sun-synchronous
Repeatability Every two days
Image Down Link Rate 150 Mbits/sec
Field of Regard 45° in pitch and roll axis
Period about 99 minutes
Mission Life 5 years
Attitude Pointing Accuracy ≦2 km in nadir direction for RSI imaging
Attitude Pointing Knowledge ≦ 390 m without GCP
Agility ≧24°/60 sec (Roll); ≧24°/60 sec (Pitch); ≧7°/60 sec (Yaw)
Ground Sampling Distance (GSD) 2m @ nadir (PAN), 4m @ nadir (Blue, Green, Red, Infrared)
Swath Width 24 km @ nadir
Contrast Transfer Function (CTF) ≧ 0.1(PAN)
≧ 0.2 (Blue, Green, Red)
≧ 0.16 (Infrared)
Signal-to-Noise Ratio (SNR) ≧83 (PAN); ≧95 (Red); ≧95 (Green); ≧100 (Blue);
≧100 (Infrared)
RSI Duty Cycle ≧8% per orbit
Image Data Storage ≧80 Gbits

FORMOSAT-5 satellite is self-reliantly developed by NSPO. NSPO is responsible for the development of satellite system, remote sensing instrument, key technologies and a heritage satellite platform. The components of FORMOSAT-5 are as indicated in the figure below.

FORMOSAT-5 is composed of Attitude and Orbit Control Subsystem (AOCS), Command and Data Handling Subsystem (C&DH), Electrical Power Subsystem (EPS), Reaction Control Subsystem (RCS), Structure and Mechanism Subsystem (SMS), Thermal Control Subsystem (TCS), Telemetry, Tracking and Command Subsystem (TT&C), Flight Software (FSW) and Payload Subsystems. The system block diagram is shown below.