Patent ID: 8587477
Filing Date: 2013-11-19
Classification: G01S

Abstract:
1. A receiver for receiving Global Positioning System (GPS) signals and Global Navigation Satellite System (GLONASS) signals, the receiver comprising: an analog front end (AFE); a GPS digital front end (DFE) and a GLONASS DFE for receiving respective GPS and GLONASS outputs of the AFE; a dual mode interface (DMI) for receiving outputs of the GPS and GLONASS DFEs; an automatic gain control (AGC) unit for selectively receiving outputs of the GPS DFE and the GLONASS DFE via an interface counter device (ICD), the ICD allowing one of GPS operation and GLONASS operation at any given time and counting samples of predetermined magnitude; and search engines for receiving outputs of the DMI, wherein front-end components of the AFE are configured to process both the GPS signals and the GLONASS signals, wherein the AFE includes a single local oscillator (LO), a GPS polyphase filter, and a GLONASS polyphase filter, wherein a LO frequency and a filter center frequency for at least one of the GPS polyphase filter and the GLONASS polyphase filter are tunable dynamically during normal receiver operation, wherein the AGC unit includes a GPS AGC unit and a GLONASS AGC unit, the GPS AGC unit adjusting a gain associated with the GPS polyphase filter, the GLONASS AGC unit adjusting a gain associated with the GLONASS polyphase filter.