The International Telecommunications Union (ITU) and the 2019 World Radiocommunications Conference (WRC19) have adopted standards to prevent interference between satellites in geostationary (GSO) and non-geostationary (NGSO) orbits and between aeronautical and 5G terrestrial services using shared frequencies.
ITU Article 22 specifies that terminals operating on NGSO satellites must limit their emissions in the direction of GSO satellites. This can and will occur when NGSO satellites move in and out of alignment with GSO satellites.
“Our VICTS phased-array technology ensures full compliance with ITU Article 22 by eliminating elevated sidelobes when operating on NGSOs, thereby protecting against interference in the GSO plane,” said Bill Milroy, CTO of ThinKom Solutions. “We have successfully completed numerous trials to demonstrate interoperability between NGSO and GSO satellites with no interference.”
Delegates at WRC19 reaffirmed the use of Ka-band frequencies for aeronautical and maritime satellite communications, but some of these frequencies are shared with terrestrial 5G mobile networks for use in point-to-point back-haul and distribution services. For that reason, WRC19 imposed strict limitations on spurious emissions from satellite terminals on aircraft to prevent interference with 5G ground networks operating on the protected Ka-bands.
“ThinKom’s proprietary VICTS phased-array architecture is designed so that the antenna’s radiating aperture is shielded by its housing,” said Milroy. “This means there is no direct path between the antenna and the ground, even at very low elevation angles, thus eliminating the need to attenuate or mute the transmit signal in order to meet the stringent WRC19 requirements.”