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Android-based smartphones receive the global navigation satellite system (GNSS) signals to determine their location and provide the GNSS raw measurement to users. The available GNSS signals on the current Android devices are GPS, GLONASS, Galileo, BeiDou, QZSS. This research has analyzed the performance of multi-GNSS position accuracy based on the pseudorange of the smartphone for maritime users. Smartphones capable of receiving dual-frequency are installed on a ship, and multi-GNSS raw information in maritime environment was measured to present the results of comparing the GNSS pseudorange-based dual-frequency positioning performance for each smarphone. Furthermore, we analyzed whether the results of the positioning performance can meet the HEA requirement of IMO for maritime navigation users. As the results of maritime experiment, it was confirmed that in the case of the smartphones supporting the dual-frequency, the position accuracy within 6 meters (95%) could be obtained, and the HEA position accuracy performance within 10 meters (95%) required by IMO could be achieved. [ABSTRACT FROM AUTHOR]

In this study, we propose a wireless meaconing jamming system for use in high-power GPS meaconing. The purpose of GPS meaconing is to ensure that the target GPS receiver calculates the intended jammer position by repeating the jammer-received GPS signal. In this case, because the received and transmitted signals have the same frequency, the front–back Ratio(FBR) of the antenna should be −160 dB when the effective radiated power(ERP) is 1 W(30 dBm). Thus, the meaconing jammer can malfunction by reducing the back-lobe level of the antenna when the receiver and transmitter are located in a jammer device. In general, the receiver and transmitter are isolated by the time-division or duplex-communication method in order to eliminate reception/transmission interference; however, this performance is still limited. Thus, we designed a wireless meaconing jammer to eliminate reception/transmission interference by long-distance separations. [ABSTRACT FROM AUTHOR]