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Difficulty: MediumScience, Emerging Technology, and Space Missions in News

With reference to High Altitude Pseudo-Satellites (HAPS) developed under emerging aerospace technology initiatives in India, which of the following statements are correct?

  1. They operate in the stratosphere at altitudes of approximately 18 to 20 kilometers, remaining above conventional weather systems and commercial air traffic.Answer
  2. B
    They rely primarily on nuclear thermal propulsion to maintain continuous equatorial geostationary orbit.
  3. They function as solar-powered atmospheric platforms capable of remaining stationary over a targeted geographic area for extended durations.Answer
  4. D
    They require orbital velocities exceeding 7.8 kilometers per second to counteract aerodynamic drag in low Earth orbit.

Answer

The correct statements are that High Altitude Pseudo-Satellites operate in the stratosphere at altitudes of 18 to 20 kilometers above weather systems and commercial air traffic, and that they function as solar-powered atmospheric platforms capable of remaining stationary over a targeted geographic area.
The statements confirming stratospheric operation at 18 to 20 kilometers altitude and long-endurance solar-powered stationary coverage are correct. HAPS vehicles bridge the gap between terrestrial towers and space satellites by operating continuously in the stratosphere using solar energy.

Step-by-Step Solution

1
Analyze the operational altitude and atmospheric layer of High Altitude Pseudo-Satellites (HAPS).
HAPS operate in the lower stratosphere (~18–20 km altitude), positioning them above weather disturbances and commercial aviation.
Establishing the operational altitude confirms their unique atmospheric flight envelope.
2
Evaluate the propulsion mechanism and energy sources of HAPS platforms.
HAPS rely on solar panels during daylight and high-density secondary batteries at night to enable continuous solar-electric flight.
Identifying the power system disproves claims of nuclear thermal propulsion.
3
Distinguish between atmospheric station-keeping and space orbital dynamics.
HAPS generate aerodynamic lift within the atmosphere to hover stationary over target regions, making space orbital velocities unnecessary.
Understanding atmospheric station-keeping clarifies why low Earth orbit velocities do not apply.

Key Concept

Operational Principles and Applications of High Altitude Pseudo-Satellites (HAPS)
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Topics

Science, Emerging Technology, and Space Missions in News

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