Abstract: With the progress of the differential technology, typical error source of global navigation satellite system (GNSS) receivers have been greatly reduced, while the multi-path ranging error remains the dominant one. To address this problem, the multi-path effects on code measurements, carrier-phase measurements are first analyzed in this paper. A low complexity code multi-path mitigation algorithm for the C/A code receivers based on the carrier-aided smoothing is then introduced, detailed. The code multi-path error is reduced from tens of meters to sub-meter, the C/A code GNSS receiver positioning accuracy is thus greatly improved. System simulation validates the proposed method.