昨天，美国众议院交通和基础设施委员会（House of Representation’s Committee on Transportation and Infrastructure）听取了包括航空运输协会（AirTransportation Association）和航空公司飞行员协会（AirLine Pilots Association）在内的多个机构的意见，称LightSquared提出的LTE网络将直接干扰航班的安全运行。听证会被告知，该网络将无法与依靠GPS提高防止空中碰撞能力的飞行系统的安全兼容。

美国交通部副部长johnd.Porcari要求委员会出台规范GPS相邻频谱使用的标准。他在听证会上说，像那些在飞机上发现的精密GPS系统需要利用宽带接收器，也能接收到规定频谱以外的信号。当被问及为什么LightSquared提出的网络会干扰GPS时，Porcari告诉委员会：

"GPS by its very nature is a very weak space-based signal received by GPS receivers in the atmosphere or in terrestrial applicati***… The recent [neighboring] pieces of spectrum were for mobile satellite service, which was [a] quiet use. What has happened with this specific proposal is essentially, you went from a mobile satellite proposal with limited ground augmentation to a ground-based service with limited satellite augmentation, and that really changed the fundamental nature of signals and how they would be received. It's really important to point out that GPS was put in a quiet piece of the spectrum on purpose, because fundamentally, it has to have quiet neighbors."

昨天，LightSquared公开要求FCC对GPS接收机进行监管，以防止它们使用公司LTE网络所依赖的频谱。有人问波卡里，他为什么建议对频谱使用进行监管，而不是像LightSquared建议的那样，对接收机本身进行监管。他表示，“制定频谱干扰标准的想法是，让所有相关人员、行业和其他方面都对他们建造越来越精确的GPS设备抱有长期信心。”他希望**在另一家公司之前进行测试，确定相邻频谱的哪些用途将与GPS标准兼容使主要资本或产品处于风险之中。

LightSquared继续认为，对GPS干扰进行的测试并不准确，因为“**依赖GPS行业设计测试，并使用不反映现实生活条件的标准秘密进行测试。该公司在昨天的听证会上作证的请求被驳回。