DME pulse interference suppression based on NLS for GPS

As a part of modernization of GPS, L5 signal is set up for civil aviation exclusively, and takes up exclusive frequency band. However, the DME (Distance Measurement Equipment) signal is already working at the same frequency band, and makes pulse interference on L5 signal with high power, which will cause degradation of SINR (Signal to Interference and Noise Ratio) and failure in tracking and acquisition of L5 signal. On DME interference suppression, the traditional methods will bring loss to useful satellite data. Thus the performance of GPS L5 receiver will suffer from serious degradation. In this paper, a new method for DME interference suppression is proposed. Under NLS (Nonlinear Least Squares) criterion, the DME signal can be treated as the signal of interest, and can be estimated and reconstructed, and thus can be eliminated and suppressed. Compared with traditional methods, the proposed method can reserve more useful satellite data. The performance of new method is verified by numerical simulations.