US officials say an agreement on a compatible signal structure for the US and European satellite navigation systems could be months away despite a recent advance in negotiations. The European Commission has been considering a compromise offered by US government officials that could end the long-running feud over signal structures for the US global positioning system and Europe's Galileo programme. Both sides continue to wrangle over the signal modulation standard for Galileo's free open service. US sources say the European standard would limit the Pentagon's freedom to deny access to Galileo or GPS navigation signals in a war zone.
Source: Flight International
