Patent ID: 8085194

Claim:
A method of processing signals, the method comprising: performing using one or more processors and/or circuits in a GNSS enabled mobile device: receiving of GNSS assistance data from a central processing station, wherein: said central processing station is communicatively coupled to a wide area reference network comprising a first plurality of GNSS tracking stations from which usable signals are received by said central processing station, and a second plurality of GNSS tracking stations from which unusable or no signals are received by said central processing station; said central processing station generates said GNSS assistance data utilizing a complete set of GNSS reference feeds for said wide area reference network; and said complete set of GNSS reference feeds comprises actual GNSS reference feeds for said first plurality of GNSS tracking stations and virtual GNSS reference feeds for said second plurality of GNSS tracking stations derived from said actual GNSS reference feeds for said first plurality of GNSS tracking stations.