By Brendan Sasso - 01/25/12 06:38 PM EST
He noted that the interference is a result of GPS devices receiving signals from outside of their designated frequencies — not by LightSquared's signal bleeding into the GPS band. He said he hopes it would be possible for GPS companies to modify their receivers to work in the presence of LightSquared's network.
Walden said his hearing will probe why the FCC did not discover the interference problem earlier and what can be done about it now.
Sen. Chuck GrassleyChuck GrassleyThe Trail 2016: Fight night Clinton, Trump tied in Iowa, Grassley leads in Senate race Senate rivals gear up for debates MORE (R-Iowa) has pledged to block President Obama's two nominees to fill FCC vacancies unless the agency releases internal documents related to its review of LightSquared.
The company is financed in large part by billionaire Phil Falcone of Harbinger Capital. But the company is now reportedly running low on cash and risks losing a contract with Sprint unless it can receive regulatory approval in the coming weeks.