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This is going to be offered to potential customers as a significantly cheaper alternative to buying a reconnaissance satellite.
http://www.janes.com/article/79777/bae-systems-reveals-phasa-35-solar-powered-hale-uav
More info here.
https://www.theengineer.co.uk/hale-phasa-35-uav/
BAE Systems has revealed its PHASA-35 concept for a solar-powered high-altitude long-endurance (HALE) unmanned aerial vehicle (UAV) that can remain aloft for up to a year.
The Persistent High Altitude Solar Aircraft (PHASA) UAV features a 35 m wingspan, giving it the moniker PHASA-35. According to the company, a quarter-scale demonstrator known as PHASA-8 flew in 2017 and work is now already under way to prepare the first full-scale aircraft to be ready for flight tests in 2019.
The 150 kg PHASA-35 is being developed by BAE Systems in partnership with UK company Prismatic, which bills itself as an expert in the design, manufacture, and delivery of innovative, high-value aerospace products and systems
http://www.janes.com/article/79777/bae-systems-reveals-phasa-35-solar-powered-hale-uav
More info here.
According to BAE Systems, Solar HALE vehicles offer a significantly cheaper alternative to conventional satellite technology, with PHASA-35 (Persistent High Altitude Solar Aircraft), being a concept solar electric UAV that uses Li-ion battery technology and ultra-lightweight GaAs (Gallium Arsenide) solar cells to potentially maintain flight for up to 12 months.
The PHASA-35 concept has a 35m wingspan and weighs 150kg. A quarter scale model (PHASE-8) completed a maiden flight in 2017, with Prismatic and BAE Systems now looking to take the technology a step further.
https://www.theengineer.co.uk/hale-phasa-35-uav/