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A Novel Approach in Detection and Characterization of CW Interference of GPS Signal Using Receiver Estimation of C/No

Narrowband interference can severely degrade the performance of GPS receivers. Different narrowband interference suppression techniques also degrade this performance correspondingly. Detecting the presence of interference and then characterizing it can lead to its removal. Knowledge that can be useful is: the location of the source or direction of arrival of the interference (spatial-directional characteristics), the time specification and frequency and power of the interference (temporal-spectral characteristics). Our focus in this work is on the second type. Using the post- processing capability of a software GPS receiver, CW interference is detected and characterized. This is achieved by passing the GPS signal and the interference through the correlator. After correlation, using the definition of carrier to noise density ratio (C/No), a mathematical expression for C/No is given in which the temporal and spectral parameters of interference are found. Then, using the conventional definition of C/No as the squared mean of the correlator output divided by its variance, the actual C/No is calculated. Finally comparing these two values and considering the structure of the GPS C/A code, the existence and characterization of the existing interference is determined.