ISRO completes its Reusable Launch Vehicle technology demonstrations through LEX trio

PTI

Bengaluru, June 23

Space agency ISRO on Sunday said it had achieved a third consecutive success in the Reusable Launch Vehicle Landing Experiment by demonstrating the autonomous landing capability of the launch vehicle under more challenging conditions.

This mission simulated the approach and landing interface and high-speed landing conditions for a vehicle returning from space, reaffirming the Indian Space Research Organisation's (ISRO) expertise in acquiring the most critical technologies required for the development of a Reusable Launch Vehicle (RLV), the space agency said.

The third and final test in the series of Landing Experiment (LEX-03) was conducted at 7.10 am at the Aeronautical Test Range (ATR) in Chitradurga, Karnataka.

Following the success of the RLV LEX-01 and LEX-02 missions, ISRO in a release said RLV LEX-03 re-demonstrated the autonomous landing capability of the RLV under more challenging release conditions (cross range of 500 m against 150 m for LEX-02) and more severe wind conditions.

The winged vehicle, named 'Pushpak', was released from an Indian Air Force Chinook Helicopter at an altitude of 4.5 km "from a release point 4.5 km away from the runway. Pushpak autonomously executed cross-range correction manoeuvres, approached the runway and performed a precise horizontal landing at the runway centreline," it said.

Due to this vehicle's low lift-to-drag ratio aerodynamic configuration, the landing velocity exceeded 320 kmph, compared to 260 kmph for a commercial aircraft and 280 kmph for a typical fighter aircraft, it added.

ISRO said that after touchdown, the vehicle velocity was reduced to nearly 100 kmph using its brake parachute, after which the landing gear brakes were employed for deceleration and stop on the runway.

During this ground roll phase, Pushpak utilises its rudder and nose wheel steering system to autonomously maintain a stable and precise ground roll along the runway, it said.

According to the space agency, this mission simulated the approach and landing interface and high-speed landing conditions for a vehicle returning from space, reaffirming ISRO's expertise in acquiring the most critical technologies required for the development of a Reusable Launch Vehicle (RLV).

Through this mission, the advanced guidance algorithm catering to longitudinal and lateral plane error corrections, which is essential for the future Orbital Re-entry Mission, has been validated, the space agency noted. 

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