Diwata-1

The baseline design of the 50 kilogram micro-satellite is assigned to Tohoku University while Hokkaido University is tasked with the payload and thermal design.


The payload subsystem includes a high-precision telescope (HPT) with 3 meter spatial resolution and bands R\G\B\NIR. The HPT will provide surface reflectance data with its derived products which will be used mostly for damage extent determination during disasters and calamities. It can also be used for imaging natural and cultural heritage sites.


The second payload is a space-borne multi-spectral imager (SMI) with liquid crystal tunable filter (LCTF), which has an 80 meter spatial resolution. The LCTF allows for image capture to be taken at 10 nanometer increments from 420nm – 650nm for the visible range and 700nm – 1050nm for the near infrared region. Space products derived from this payload can be used to determine the health and composition of the ocean, identify distribution and magnitude of harmful algal blooms, and monitor coastal ecosystems.


With a spatial resolution of 7 kilometers, the wide field camera can used to complement current weather forcasting capabilities. This sensor can potentially image cloud formations and typhoons. Other subsystems included are command and data handling, attitude determination and control, telemetry tracking and command, and power supply system.

Overview of Bus Specification and Payload

PAYLOAD

  • High Precision Telescope (HPT)
  • Multispectral Imager with LCTF (MSI)
  • Wide Field CCD, Panchromatic (WFC)
  • Medium Field CCD, Color (MFC)

COMMAND AND HANDLING

  • Satellite Handling Unit (SCU)

ALTITUDE DETERMINATION AND CONTROL

  • Geomagnetic Aspect Sensor (GAS)
  • Sun Aspect Sensor (SAS)
  • Sun Earth Sensor (SES)
  • Magnetic Torquer (MTQ)
  • Reaction Wheel (RW)

TELEMETRY, TRACKING AND COMMAND

  • UHF-band Receiver (URX)
  • S-band Transmitter (STX)
  • X-band Transmitter (XTX)

POWER SUPPLY SYSTEM

  • Battery (BAT)
  • Solar Cell Panels (SCP)