Cannot find an appropriate thread so posting it here.
2014 patent from Beijing Institute of Spacecraft Environment Engineering.
A satellite-borne plasma antenna communication method for submarine communication, It ejects an ultra-long plasma jet from a low-orbit satellite as a VLF/ELF transmitting antenna, which has extremely high concealment, flexibility, stealth and maneuverability. By absorbing and refracting the electromagnetic waves emitted by the radar, the scattering cross section formed on the radar is very small, thus having good stealth characteristics.
Traditional submarine communications use the shore based VLF/ELF frequency band. However due to the huge size of ground-based antenna equipment, which occupies a large area and are vulnerable to attack, the wartime survivability and combat effectiveness of submarines are greatly limited.
2014 patent from Beijing Institute of Spacecraft Environment Engineering.
A satellite-borne plasma antenna communication method for submarine communication, It ejects an ultra-long plasma jet from a low-orbit satellite as a VLF/ELF transmitting antenna, which has extremely high concealment, flexibility, stealth and maneuverability. By absorbing and refracting the electromagnetic waves emitted by the radar, the scattering cross section formed on the radar is very small, thus having good stealth characteristics.
Traditional submarine communications use the shore based VLF/ELF frequency band. However due to the huge size of ground-based antenna equipment, which occupies a large area and are vulnerable to attack, the wartime survivability and combat effectiveness of submarines are greatly limited.