ISRO Successfully Launches Earth Observation Satellite EOS-08

ISRO Launches Earth Observation Satellite EOS-08: A Leap in Space Technology

ISRO’s Latest Satellite EOS-08 Successfully Launched

On August 16, 2024, at 9:17 AM IST, the Indian Space Research Organisation (ISRO) successfully launched the Earth Observation Satellite EOS-08 from the Satish Dhawan Space Centre in Shriharikota. This mission marks a significant milestone in India’s space program, with the EOS-08 being launched aboard the Small Satellite Launch Vehicle (SSLV)-D3.

ISRO Successfully Launches Earth Observation Satellite EOS-08 — ISRO Successfully Launches Earth Observation Satellite EOS 08

Mission Objectives and Satellite Features

The EOS-08 mission was conceived with the primary objectives of designing and developing a microsatellite equipped with advanced payload instruments. These payloads are tailored to be compatible with the microsatellite bus, incorporating cutting-edge technologies essential for future operational satellites.

Built on the Microsat/IMS-1 bus, EOS-08 carries three critical payloads:

Electro Optical Infrared Payload (EOIR): Designed to capture images in the Mid-Wave IR (MIR) and Long-Wave IR (LWIR) bands, the EOIR payload functions effectively during both day and night. It serves applications in satellite-based surveillance, disaster monitoring, environmental observation, fire detection, volcanic activity observation, and industrial disaster monitoring.
Global Navigation Satellite System-Reflectometry Payload (GNSS-R): This payload demonstrates the capability of using GNSS-R-based remote sensing for ocean surface wind analysis, soil moisture assessment, cryosphere studies over the Himalayan region, flood detection, and inland waterbody observation.
SiC UV Dosimeter: The SiC UV Dosimeter plays a critical role in monitoring UV irradiance at the Crew Module’s viewport in the Gaganyaan Mission. Additionally, it acts as a high-dose alarm sensor for gamma radiation.

Technical Specifications and Innovations

EOS-08 is designed to operate in a Circular Low Earth Orbit (LEO) at an altitude of 475 km, with an inclination of 37.4°. The satellite has a mission life of one year and a mass of approximately 175.5 kg. It generates power around 420 W, interfacing seamlessly with the SSLV-D3 launch vehicle.

The satellite’s advancements in mainframe systems include an Integrated Avionics system, known as the Communication, Baseband, Storage, and Positioning (CBSP) Package. This package combines multiple functions into a single, efficient unit. The system supports up to 400 Gb of data storage and is designed with cold redundant systems using commercial off-the-shelf (COTS) components and evaluation boards.

Miniaturized Design and Advanced Components

EOS-08 showcases a miniaturized design in its Antenna Pointing Mechanisms, achieving a rotational speed of 6 degrees per second with a pointing accuracy of ±1 degree. The miniaturized phased array antenna enhances communication capabilities, while the flexible solar panel, incorporating a foldable solar panel substrate and advanced materials, offers improved power generation and structural integrity.

A notable innovation is the use of a pyrolytic graphite sheet diffuser plate with a high thermal conductivity of 350 W/mK. This feature reduces mass and is applied in various satellite functions. Additionally, EOS-08 introduces a new method of integrating housekeeping panels using a hinge-based fixture, significantly reducing the duration of the Assembly, Integration, and Testing (AIT) phase.

Indigenization and Technological Advances

The EOS-08 mission highlights ISRO’s commitment to indigenization through solar cell fabrication processes and the use of a Nano-Star Sensor for Microsat Applications. The satellite’s inertial system benefits from reaction wheel isolators that attenuate vibrations, and a single antenna interface is used for Telemetry, Tracking, and Command (TTC) and Satellite Positioning System (SPS) applications.

Thermal management in EOS-08 is enhanced by utilizing advanced materials such as AFE BGA, Kintex FPGA, Germanium Black Kapton, and STAMET (Si-Al Alloy) Black Kapton. These materials handle the thermal properties of COTS components effectively. The mission also features an auto-launch pad initialization, demonstrating its innovative approach to mission management.

Conclusion

The successful launch of EOS-08 by ISRO is a testament to India’s growing capabilities in space technology. The advanced payloads, miniaturized design, and innovative technologies incorporated in this mission are expected to significantly enhance the country’s ability to monitor and respond to environmental changes, disasters, and other critical events.

As ISRO continues to push the boundaries of space exploration, the EOS-08 mission marks another proud achievement in India’s space journey, promising to contribute valuable data and insights to a wide range of applications.

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