Abstract：Multipath interference is the main error source in high-precision global navigation satellite system (GNSS) applications. The geosynchronous earth orbit (GEO) satellite in the BeiDou navigation satellite system (BDS) has extremely low fading frequencies on the multipath signals, so most measurement based multipath detection techniques are ineffective. This paper describes a multipath detection method based on a circularly rotating antenna. The rotating parameters are controlled to increase the multipath fading frequency so that it is separated from the spectrum of the received signals to facilitate detection. Tests use a GNSS signal generator to create the multipath environment. This method successfully detects a short delay multipath signal that is 30 dB lower than the direct signal. Its signal detection ability is then better than the carrier to noise ratio (CNR) and code minus carrier (CMC)-based multipath detection methods. This method dramatically reduces the detection time and solves the GEO multipath detection problem.
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2018, Vol. 58 
