Combined GPS/GLONASS satellite positioning system receiver

摘要

A combined GPS/GLONASS Receiver is disclosed. The GLONASS system of satellites operates at a higher orbit inclination than GPS satellites (64. degree. for GLONASS, 55° for GPS). This leads to GLONASS having better coverage at higher latitudes, e.g. in the State of Alaska or Northern Europe. The combined GPS/GLONASS receiver incorporates this advantage. Another advantage of using the GPS/GLONASS receiver is that GLONASS can become a back up system when the US Government intentionally degrades the GPS system accuracy via Selective Availability (SA). The combined GPS/GLONASS Receiver can receive signals from more satellites and therefore has more resistance to jamming than a single GPS or GLONASS Receiver.