Multipath error mitigation based on wavelet transform in L1 GPS receivers for kinematic applications

GPS positioning issue has been experienced a surge of interest for multipath mitigation in the past few years. Multipath disturbance is a challenging error in high precision GPS positioning particularly in kinematic mode where the moving receiver undergoes different multipath circumstances. Diverse hardware and software approaches have been implemented to reduce this error in both static and kinematic modes. We have proposed an algorithm to alleviate C/A code multipath in kinematic mode. Our proposed scheme falls into software group where wavelet transform (WT) has been used as the main basis. Of course, we have used stationary wavelet transform (SWT) as the key idea of our proposed method that makes it possible to investigate all frequency sub-bands. Consequently, it would be possible to extract multipath disturbance since it is considered to be a low frequency term. After applying SWT to double difference (DD) residuals, the multipath error is extracted and used to correct DD observations. In this paper, we have designed three experiments to study our proposed method efficiency under different conditions in comparison with existing algorithms.