High Altitude LTA Platforms (HAPs) are the most effective communication and Surveillance tools due to the longest possible mission in the atmosphere and the highest available altitude after the satellites. Beside being the lower cost alternatives to the last ones HAPs can offer several other important advantages, like multiple use, possibility to maintain or upgrade the mission payload. At the same time HAPs use similar to space vehicles approaches such as solar energy use and state of the art technologies and materials capable to withstand challenges of the near space.
Newest technologies and innovative materials allow creating the new generation of the tethered aerostatic systems. To get to the previously unachievable altitudes of 5 to 11 km these aerostats do not use heavy power tethers producing power on board instead. For that purpose, solar or hybrid power system can be used depending on the payload requirements. THAPs are the perfect tools for the long-range radio relays and special monitoring missions and scientific purposes.
Propulsion assisted HAPs are high altitude unmanned solar powered airships with the propulsion system capable to resist the winds with 99% of availability. For the little chance of stronger wind PAHAP can change altitude in the range of 17-21 km finding more favorable conditions. It also easily changes the location of the station keeping. PAHAP can propose the longest possible mission of any aircraft – up to one year. It makes this unique LTA vehicle a perfect platform for persistent surveillance and reliable communications.