DARPA  April 22, 2022 DARPA’s new Ouija program aims to use sensors on low-orbiting satellites to provide new insights into HF radio wave propagation in the ionosphere. Ouija will augment ground-based measurements with in-situ measurements from space, in very low- Earth orbit (VLEO), to develop and validate accurate, near real-time HF propagation predictions. The VLEO altitude regime is of particular interest due to its information-rich environment where ionospheric electron density is at a maximum. The program includes two technical areas. The first technical area announced in a solicitation, seeks to develop, qualify, launch, and operate multiple small satellites carrying scientific […]