Direction-of-arrival estimation for coherent GPS signals based on oblique projection

A new direction-of-arrival (DOA) estimation method for coherent global positioning system (GPS) signals is proposed. It is applicable to the GPS propagation environment with rich multipath, strong interferences and noise. According to the properties of oblique projection, interferences and noise are first suppressed and only the coherent GPS signals are retained by projecting the received signal onto the signal subspace. Then, the coherent GPS signals are resolved by the Toeplitz decorrelation scheme. Using the proposed method, interferences and noise can be suppressed simultaneously, and more accurate DOA estimation for coherent GPS signals can be obtained in GPS propagation environment. Simulation results demonstrate the effectiveness of the proposed method.

► A DOA estimation method is proposed for coherent GPS signals.
► The interferences and noise are suppressed by oblique projection.
► The coherent GPS signals are resolved by the Toeplitz decorrelation scheme.
► More accurate DOA estimation for coherent GPS signals can be obtained.
► The proposed method is suitable for the GPS propagation environment.