LOW POWER ASYNCHRONOUS GPS BASEBAND PROCESSOR
1 Assignment
0 Petitions
Accused Products
Abstract
Asynchronous Global Positioning System (GPS) baseband processor architectures with a focus on minimizing power consumption. All subsystems run at their natural frequency without clocking and all signal processing is done on-the-fly.
-
Citations
31 Claims
-
1-25. -25. (canceled)
-
26. A method for clockless GPS baseband processing, the method comprising:
-
a) receiving an input signal for one channel from an RF front and; b) providing the input signal to a code numerically controlled oscillator (NCO) and a carrier NCO; c) using overflows in the code NCO to mark a predetermined code period, thereby forming an accumulation interval and referencing time to sampling in the input signal; d) obtaining, from output of the carrier NCO and the code NCO, early, prompt and late phase and quadrature accumulations; e) obtaining code offset and Doppler frequency estimates for the one channel; f) tracking deviations in code offset and Doppler frequency for the one channel, using the early, prompt and late phase and quadrature accumulations; g) obtaining GPS satellite time and code start time from code offset and Doppler frequency information and the input signal; and h) repeating steps (a)-(g) until all channels have been processed;
wherein all steps are performed asynchronously. - View Dependent Claims (27, 28, 29, 30, 31)
-
Specification