Single rf receiver chain architecture for gps, galileo and glonass navigation systems, and other circuits, systems and processes

An electronic circuit for separating frequency-overlapped GLONASS and GPS overlapped in an approximately 4 MHz passband, said circuit comprising:

• a multiple-path analog-to-digital converter circuit (ADC);
• a sampling rate circuit coupled to concurrently operate the analog-to-digital converter circuit at a sampling rate between about 60 Msps and about 80 Msps;
• and
• a digital processing circuit including storage defining complex de-rotation and low pass filtering, said digital processing circuit fed by said analog-to-digital converter circuit and operable A) to establish an access rate and respective distinct phase increments for the complex de-rotation, and B) to execute the complex de-rotation by combinations of trigonometric multiplications using the distinct phase increments approximately concurrently and C) to execute the low pass filtering on the complex de-rotation resulting at the access rate and respective distinct phase increments, whereby to deliver GPS and Glonass signals separated from each other.