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Pototype software-based GPS receiver for reflected signal analysis

We will discuss about the prototype software-based GPS receiver for reflected signal analysis. The receiver consists of a dual-antenna front-end device that down-converts the signals from the antenna to an intermediate frequency and digitize them at certain sampling frequency. The down-converted data is then processed by using software for reflected signal analysis. The receiver contains two antennas of different polarization which are left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP). The RHCP antenna is zenith oriented and the LHCP antenna is nadir or ground oriented at certain angle from the nadir. The purpose of such orientation is to acquire direct signal by RHCP antenna and reflected signal by LHCP antenna. GPS signals transmitted by the satellite are RHCP and when reflected the polarization may reverse into LHCP depending upon the incidence angle and the electrical property of the reflecting material. A reflected signal takes more time to arrive the receiver and is weaker compared to the direct signal. The main task of the receiver is to compute the delay of the reflected signal and it’s amplitude with respect to the direct signal. Since,, the reflected signal characteristics are dependent on the reflecting material, there are possibilities to use this type of receiver as a GPS bi-static radar as well as for multipath mitigation.