ISRO Scientists Successfully Fire 4th Stage of PSLV-C58 to Hold Experiments

Space News ,India :- In a remarkable achievement, the Indian Space Research Organisation (ISRO) executed a flawless mission using the PSLV-DL variant, boasting a lift-off mass of 260 tons. At the heart of today success was the fourth stage, meticulously configured as a 3-axis stabilized Orbital platform designed for groundbreaking experiments.

The mission pivotal moment unfolded with the injection of XPOSAT, followed by the PS4 stage undergoing two re-starts. This strategic move reduced the orbit to a 350 km circular orbit, setting the stage for a 3-axis stabilized mode to conduct extensive Orbital Platform (OP) experiments.

In a groundbreaking maneuver on Monday, ISRO conducted a maneuvering experiment by firing the fourth stage of the Polar Satellite Launch Vehicle rocket twice. This scientific feat aimed to delve into uncharted territories and expand our understanding of space through experimentation.

Further enhancing the scientific endeavor, scientists at ISRO Bangalore headquarters initiated the firing of the fourth stage twice, effectively lowering the altitude from 650 km to 350 km. This adjustment paved the way for the POEM-3 experiment, wherein 10 diverse payloads from various ISRO centers were activated in Low Earth Orbits.

This success story mirrors a previous achievement in April 2023 when ISRO conducted a similar scientific experiment during the PSLV-C55 mission using the POEM-2 module.

The fourth stage orbital platform electrical power needs are met through a combination of Flexible Solar Panels and a 50 Ah Li-ion battery. This platform encompasses avionic systems responsible for navigation, guidance, control, telecommands, and altitude control systems crucial for testing payloads.

The intricate process of orbit change and passivation involved lowering the PS4 stage from 650 km to approximately 350 km. This was achieved through two restarts of the PS4 stage, with the remaining propellant disposed of through the main engines. This crucial step ensures the safety of the PS4 stage for future atmospheric re-entry experiments.

ISRO PSLV Orbital Experimental Module-3 (POEM-3) is a key player in this mission, utilizing the fourth stage as a 3-axis stabilized Orbital platform. The platform is geared towards conducting experiments to space-qualify systems with innovative concepts. Avionic systems, flexible solar panels, and a Li-ion battery work in tandem to ensure precise navigation, guidance, control, and telecommands.

Among the 10 payloads featured in this pioneering mission are projects such as the Radiation Shielding Experiment Module, Women Engineered Satellite, BeliefSat (an amateur radio satellite), Green Impulse Transmitter, LEATTD Technology Demonstrator, RUDRA 0.3HPGP, ARKA 200, Dust Experiment (DEX), and Fuel Cell Power System. These diverse experiments represent a collective stride towards advancing space exploration and technology.