Patent ID: 7415354

Claim:
A system for acquisition of GPS satellite signals in the presence of interfering signals, comprising: a GPS antenna and radio frequency receiver configured to receive GPS L 1 and L 2 signals as GPS signals; a GPS signal tracker configured to phase de-rotate and correlate one or more of said GPS signals into at least early and late I and Q signals; an acquisition module configured to extract range residual errors and carrier phase residual errors in the presence of interference signals, wherein the acquisition module is further configured to assign a plurality of channels to a desired satellite signal for acquisition and to compute a range offset from said range residual errors; a navigation Kalman filter for processing vehicle range and carrier phase residual signals to generate vehicle position, velocity, attitude, and time estimates; a navigation processor for calculating navigation estimates between update intervals of the navigation Kalman filter; a satellite navigation estimator configured to provide satellite position, velocity, and acceleration (PVA) data to a satellite line of sight projection processor and to the navigation Kalman filter; and the satellite line of sight projection processor, which is configured to project navigation data onto the satellite line of sight, generate range and range rate estimates, and provide these estimates to one or more Numerically Controlled Oscillators configured to provide code and carrier signals for GPS signal phase de-rotation and correlation.