DRDO Flies Indigenous HAPS At 21 Km, Demonstrates Sustained High-Altitude Endurance Successfully

The Defence Research and Development Organisation (DRDO) has successfully flight-tested an indigenously developed High-Altitude Platform (HAPS), demonstrating the ability of the experimental system to operate at altitudes around the edge of the lower stratosphere. During the test flight, the platform climbed to 21 km above mean sea level and subsequently maintained an altitude of 20 km for more than 30 minutes, the Ministry of Defence said on Tuesday. The platform was later instructed to return to the ground and was successfully recovered, allowing the DRDO team to analyse data generated during the flight and assess its performance.

The test is part of efforts to develop high-altitude platforms that can remain airborne for extended periods and perform specialised functions above conventional aircraft operating altitudes. Unlike conventional satellites, which operate much farther above Earth, HAPS systems are designed to fly at high altitudes within the atmosphere. They can potentially provide persistent coverage over a particular area while carrying sensors, communication equipment or other payloads. Their ability to operate closer to the ground than satellites can also offer advantages for certain surveillance, communication and monitoring applications.

What is HAPS? A High-Altitude Platform is an aircraft-like system designed to operate at very high altitudes, generally in the stratosphere, for prolonged periods. Depending on its design, a HAPS can be powered by solar energy or other systems and can carry equipment for communications, surveillance, navigation, environmental monitoring and intelligence gathering. Because it can remain above much of the weather and operate at an altitude substantially higher than conventional aircraft, a HAPS can potentially provide a wide field of view and long-duration coverage without requiring the same orbital infrastructure as a satellite.

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The indigenous platform tested by DRDO carried an Inertial Measurement Unit (IMU), a GPS receiver, onboard cameras and an altitude-control system. These components enabled the platform to navigate, monitor its flight and maintain the required altitude during the experimental mission. The IMU can provide information about the platform’s movement and orientation, while GPS supports positioning and navigation. Onboard cameras can provide visual information during flight, and the altitude-control system helps maintain the platform at a designated height. Together, these systems allowed DRDO researchers to evaluate the platform’s ability to operate under high-altitude conditions.

During the experimental flight, the HAPS first reached 21 km above mean sea level before maintaining an altitude of 20 km for more than 30 minutes. The ability to climb to the target altitude and subsequently hold a stable flight profile was an important part of the test. After the required flight phase was completed, the platform was commanded to return to the ground and was successfully recovered. The recovery provided the development team with an opportunity to examine the platform and combine that information with the flight data collected during the test.

The Ministry of Defence said the experimental flight generated performance data that would be analysed by the DRDO team. Such data can help engineers evaluate the platform’s flight characteristics, navigation, altitude control and onboard systems, while also identifying areas that require further development. Experimental flight-testing is particularly important for high-altitude systems because operating conditions can differ significantly from those encountered at lower altitudes. Factors such as low atmospheric density, temperature, propulsion performance, power management and flight stability can influence the performance of an aircraft operating at such heights.

HAPS technology has potential applications in both civilian and defence domains. A high-altitude platform could potentially support persistent surveillance over large areas, provide communication links, assist in disaster monitoring and complement existing airborne and space-based systems. For defence applications, such platforms could offer long-duration observation and communication capabilities without depending exclusively on conventional aircraft or satellites. The exact operational capabilities and future applications of the DRDO platform will depend on further testing and development. The latest flight nevertheless represents a step in the development of indigenous high-altitude aviation technology, with the data from the mission expected to guide subsequent improvements to the platform.

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