Agency Examining Possible L-Band Interference with Global Positioning Satellites
NTIA is investigating possible L-band direct-to-device (D2D) service impacts on GPS. In a notice Thursday, it said that given the growing deployments of consumer equipment that could operate on mobile satellite service (MSS) networks near the L-1 GPS signal at…
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1575.42 MHz, it is requesting public comments on the risk of interference into GPS by those D2D L-band services and potential routes for mitigation. It said the L band's MSS rules contain "substantially more relaxed" out-of-band emission (OOBE) limits than are placed on fixed satellite service operations in the band. "The wide deployment of devices subject to the MSS limit thus presents an unexpected increase in the risk of interference to nearby GPS receivers." It added that it is seeking input from D2D providers about actual OOBE of the devices and the potential for limiting these further, as well as from GPS manufacturers and users about documented instances of harmful interference from MSS L-band devices and ways of mitigating that while minimizing the impact on MSS service. NTIA's notice hasn't yet been published in the Federal Register.