On the use of Hilbert-Huang Transforms in GPS Software Receivers

Global Positioning System (GPS) is susceptible to interference from both man-made and natural sources. The suppression of interference in GPS signals using Hilbert Huang Transform (HHT) in the software receiver model is demonstrated. HHT is a novel method used to analyze non-linear and non-stationary data. It uses Empirical Mode Decomposition (EMD) to obtain the basis function. Here we use EMD to sift out the noise and subsequently remove it from the GPS signal. We attempt to implement this as a part of the GPS software receiver and the results are analyzed for single-tone, linear chirp and pulse interference.