Abstract: The application prospect of combined GPS/GLONASS in civil aviation is researched. The potential of combined GPS/GLONASS in the availability, accuracy and integrity of civil aviation is analysed. The structure of a twelve channel integrated GPS/GLONASS receiver is proposed. Triple down conversion is adopted in the receiver's RF front end to convert GPS and GLONASS RF to IF. The IF signal is sampled to In phase and Quadrature samples. They are accumulated and processed in digital part and the navigation message is demodulated. The transformation of WGS 84 and PZ 90 is incorporated into the solution of GPS/GLONASS navigation.

Key words: r eceiver, civil aviation, navigat ion, GPS, GLONASS