India successfully achieves autonomous landing of Space vehicle
Bengaluru (PTI): The Indian Space Research Organisation on Sunday successfully conducted the Reusable Launch Vehicle Autonomous Landing Mission (RLV LEX).
The test was conducted at the Aeronautical Test Range (ATR), Chitradurga, Karnataka, the national agency headquartered here said.
"With that, ISRO successfully achieved the autonomous landing of a space vehicle", it said in a statement.
"With LEX, the dream of an Indian Reusable Launch Vehicle arrives one step closer to reality", ISRO said.
In a first in the world, a winged body has been carried to an altitude of 4.5 km by a helicopter and released for carrying out an autonomous landing on a runway.
RLV is essentially a space plane with a low lift to drag ratio requiring an approach at high glide angles that necessitated a landing at high velocities of 350 kmph.
The RLV took off at 7:10 am IST by a Chinook Helicopter of the Indian Air Force (IAF) as an underslung load and flew to a height of 4.5 km (above Mean Sea Level).
Once the predetermined pillbox parameters were attained, based on the RLV's Mission Management Computer command, the RLV was released in mid-air, at a down range of 4.6 km.
Release conditions included 10 parameters covering position, velocity, altitude and body rates, etc. The release of RLV was autonomous. RLV then performed approach and landing maneuvers using the Integrated Navigation, Guidance & control system and completed an autonomous landing on the ATR air strip at 7:40 AM IST.
The autonomous landing was carried out under the exact conditions of a Space Re-entry vehicle's landing high speed, unmanned, precise landing from the same return path as if the vehicle arrives from space.
Landing parameters such as Ground relative velocity, the sink rate of Landing Gears, and precise body rates, as might be experienced by an orbital re-entry space vehicle in its return path, were achieved.
The RLV LEX demanded several state-of-the-art technologies including accurate Navigation hardware and software, Pseudolite system, Ka-band Radar Altimeter, NavIC receiver, indigenous Landing Gear, Aerofoil honey-comb fins and brake parachute system.
LEX utilised several indigenous systems. Localized Navigation systems based on pseudolite systems, instrumentation, and sensor systems, etc. were developed by ISRO.
Digital Elevation Model (DEM) of the landing site with a Ka-band Radar Altimeter provided accurate altitude information.
Extensive wind tunnel tests and CFD simulations enabled aerodynamic characterisation of RLV prior to the flight.
"Adaptation of contemporary technologies developed for RLV LEX turns other operational launch vehicles of ISRO more cost-effective", the statement said.
ISRO had demonstrated the re-entry of its winged vehicle RLV-TD in the HEX mission in May 2016. The re-entry of a hypersonic sub-orbital vehicle marked a major accomplishment in developing Reusable Launch Vehicles.
In HEX, the vehicle landed on a hypothetical runway over the Bay of Bengal. Precise landing on a runway was an aspect not included in the HEX mission.
The LEX mission achieved the final approach phase that coincided with the re-entry return flight path exhibiting an autonomous, high speed (350 kmph) landing.
The LEX began with an Integrated Navigation test in 2019 and followed multiple Engineering Model Trials and Captive Phase tests in subsequent years.
Along with ISRO, IAF, Centre for Military Airworthiness and Certification (CEMILAC), Aeronautical Development Establishment (ADE), and Aerial Delivery Research and Development Establishment (ADRDE) contributed to this test.
The IAF team hand in hand with the Project team and multiple sorties were conducted to perfect the achievement of release conditions.
Secretary in the Department of Space and ISRO Chairman S Somanath was among who witnessed the test.
India 🇮🇳 achieved it!
— ISRO (@isro) April 2, 2023
ISRO, joined by @DRDO_India @IAF_MCC, successfully conducted the Reusable Launch Vehicle Autonomous Landing Mission (RLV LEX)
at the Aeronautical Test Range (ATR), Chitradurga, Karnataka in the early hours on April 2, 2023.
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Siddaramaiah, I will abide by Cong high command decision on leadership issue, says Shivakumar
Bengaluru (PTI): Karnataka Deputy Chief Minister D K Shivakumar on Sunday said both he and Chief Minister Siddaramaiah will abide by any decision takeb by the Congress high command on the leadership issue in the state.
Speaking to reporters after returning from Delhi, the Congress state president said, he has full faith in the party leadership and that it would take an approapriate decision at the appropriate time.
The remarks comes amid speculations within the party and political circles about a possible leadership change and cabinet reshuffle after May 4, when the results for assembly elections in four states and one union territory, along with bypolls to two assembly segments in the Karnataka are announced.
"I will not speak about political issues before the media. I have already said that when the time comes you will get to know. So I will not tell you," Shivakumar said in response to a question on discussions with the Congress high command during his Delhi visit over the last couple of days.
He asserted that there are no issues within the party, and whatever has been already decided will take place accordingly.
Responding to a question on senior Minister Satish Jarkiholi's reported statement about internal differences, the Deputy CM said, "nothing like that, they (high command) will do what they have to do at the appropriate time."
"There are no issues, we have faith in our party, they will do what they have to," he added.
Asked about the issue of leadership change as the government is about to complete three years in office, Shivakumar said, "... I have never discussed this issue. The CM and I have both said that we will accept whatever and whenever the high command decides, and we will abide by it."
He declined to comment when asked whether any "good news" can be expected by his birthday on May 15.
The leadership tussle within the ruling party has intensified amid speculation about a possible change of chief minister after the Congress government completed the halfway mark of its five-year term on November 20, 2025. The speculation has been fuelled by the reported "power-sharing" arrangement between Siddaramaiah and Shivakumar at the time of government formation in 2023.
Responding to a question on the BJP's criticism against the Congress government over its decision on internal reservation for Scheduled Castes, alleging injustice to several communities and questioning its intent behind the revised quota formula, Shivakumar said the BJP could not do anything on internal reservation while in power, but the Congress has kept its promise.
"We have found a solution and tried to do justice to all sections among SCs. We have fulfilled the promise made and every one should go together," he said.
Shivakumar warned his party workers against erecting flex banners for his birthday on May 15.
"For May 15, I want to tell everyone that no one should put up flex banners or advertisements for my birthday. If flex are installed I will ensure that cases are registered by authorities against those responsible, whether they are party workers or followers....no one should put such things on roads, this is my personal request," he said, adding that he has asked commissioners of the city corporations to register cases and impose heavy fines.
