That said, the committee claims current technology enables building a receiver robust to Ligado signals for any GPS applications. However, high-precision receivers are vulnerable. The committee found that most commercial and certified aviation GPS receivers will not experience significant harmful interference from Ligado emissions as authorized by the FCC. In addition, a cleared subset of the committee received a set of classified briefings. The committee formed in response met weekly from September 2021 to April 2022 to plan the study receive briefings from experts and stakeholders and review relevant reports, technical literature, and written submissions to the committee. Section 1663 of the Fiscal Year 2021 National Defense Authorization Act called on the Department of Defense (DOD) to enter into an agreement with the NASEM to carry out “an independent technical review of the order and authorization to the extent that such Order and Authorization affects the devices, operations or activities of the Department of Defense.” It considers how best to evaluate harmful interference to civilian and defense users of GPS, the potential for harmful interference to GPS users and DOD activities, and the effectiveness and feasibility of the mitigation measures proposed in the FCC order. The 77-page report reviews order FCC 20-48, which authorized Ligado Networks LLC to operate a low-power terrestrial radio network adjacent to the GPS frequency band. The National Academies of Sciences, Engineering and Medicine (NASEM) has issued a report discussing whether a terrestrial wireless network proposed by Ligado Networks - and approved by the Federal Communications Commission (FCC) in April 2020 -will cause widespread interference to millions of GPS receivers.

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