Search results
Results from the WOW.Com Content Network
A high altitude platform can provide observation or communication services. A high-altitude platform station (HAPS, which can also mean high-altitude pseudo-satellite or high-altitude platform systems), also known as atmospheric satellite, is a long endurance, high altitude aircraft able to offer observation or communication services similarly to artificial satellites.
The Hawk30 flying-wing is a development of the NASA Pathfinder and NASA Helios high-altitude, long-endurance unmanned aircraft built by AeroVironment for NASA. [2] Resembling the 1999 Helios, the tailless aircraft is a 256 ft (78 m) span flying wing with 10 electric-driven propellers. Orbiting at 65,000 ft (20,000 m), it is solar-powered by day ...
In 2003, QinetiQ, a commercial offshoot of the UK Ministry of Defence, was planning to fly its Zephyr 3 up to 40 km at 70 m/s (250 km/h; 140 kn), after being released from a high-altitude balloon at 9 km, besting the NASA Helios which had reached 29 km. [3] It was envisionned as an alternative to space satellites, stationed permanently in the stratosphere for environmental monitoring, mobile ...
The advantage of high-altitude aerial photography is that it can record the information of a larger area by taking one photograph only. [5] However, high-altitude photographs cannot show as many details as low-altitude photographs since some objects, such as buildings, roads, and infrastructures, are of a very tiny in size in the image. [5]
The exact height of a satellite in a Molniya orbit varies between missions, but a typical orbit will have a perigee altitude of approximately 600 kilometres (370 mi) and an apogee altitude of 39,700 kilometres (24,700 mi), for a semi-major axis of 26,600 kilometres (16,500 mi).
A HAPS (High-Altitude Platform System or High Altitude Pseudo-Satellite), is an unmanned aerial vehicle which is to remain relatively stationary at high altitude. They can be used as communications platforms, for weather surveys, traffic reports etc.
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
High Earth orbit: geocentric orbits above the altitude of geosynchronous orbit (35,786 km or 22,236 mi). [8] For Earth orbiting satellites below the height of about 800 km, the atmospheric drag is the major orbit perturbing force out of all non-gravitational forces. [11]