The Application of New TK Discriminator in GPS Code Tracking Loop

Multipath is a dominant error source in satellite positioning. Despite the development of various multipath mitigation methods, close-in multipath is still a problem area and an efficient delay estimation technique with good accuracy is always desired. A promising concept has been proposed in the literature which is based on the non-linear Teager-Kaiser(TK) energy operator to estimate and track the real delay. However, different implementation schemes of TK method have been developed with various degrees of accuracy and computational complexity. This paper present a new innovation for developing a short TK interval phase method, andTeager-Kaiser Early-Minus-late 5 correlators (TK-EML5) phase discriminator  with less computational complexity. This thoroughly investigation is based on simulations and analysis of experimental data.  Furthermore, comparative analysis is carried out using standard non-coherent early-late power (ELP, Early-minus-Late Power) and TK Early-minus-Late 6 correlators (TK-EML6) discriminator. The results show that GPS receiver which uses TK-EML5approach has a high code tracking and positioning accuracy without compromising the computational burden.