Abstract
Multipath and continuous wave (CW) interference may cause severe performance degradation of global navigation satellite system (GNSS) receivers. This paper analyzes the code tracking performance of early-minus-late power (EMLP) discriminator of GNSS receivers in the presence of multipath and CW interference. An analytical expression of the code tracking error is suggested for EMLP discriminator, and it can be used to assess the effect of multipath and CW interference. The derived expression shows that the combined effects include three components: multipath component; CW interference component and the combined component of multipath and CW interference. The effect of these components depends on some factors which can be classified into two categories: the receiving environment and the receiver parameters. Numerical results show how these factors affect the tracking performances. It is shown that the proper receiver parameters can suppress the combined effects of multipath and CW interference.
Highlights
global navigation satellite system (GNSS) signal is very susceptibility to receiving environment [1,2]
An analytical expression of the code tracking error is suggested for early-minus-late power (EMLP) discriminator, and it can be used to assess the combined effect of multipath and continuous wave (CW) interference
The effects of CW interference and multipath on EMLP discriminator are analyzed in this paper
Summary
GNSS signal is very susceptibility to receiving environment [1,2]. Multipath is the dominant error source in most GNSS applications. Reference [7] suggested analytical expressions for GNSS receiver performance such as the effective carrier-to-noise density ratio, the code tracking error and the carrier phase tracking error for the receiver affected by CW interference. If multipath and interference exist at the same time, their effects on the code tracking performance with EMLP discriminator are not independent. The combined effects of multipath and CW interference haven’t been analyzed in other papers. This paper analyzes the effects of multipath and CW interference on the code tracking performance of GNSS receivers. An analytical expression of the code tracking error is suggested for EMLP discriminator, and it can be used to assess the combined effect of multipath and CW interference.
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