n this paper, a software defined real-time spoofing device was developed. At the previous work, we developed a real-time spoofing simulator. The simulator was consisted of two parts which are a baseband signal generation and a RF up-conversion part. A synchronization with real GNSS signal was not implemented. In implementation of a software defined real-time GNSS spoofing device, a synchronization with a real GNSS signal is a bottle-neck. So we proposed a solution of synchronization which is easily implementable. For the synchronization, two low-cost receivers and one micro-controller are needed. After completing of the synchronization, we acquired accuracy of several tens of nanoseconds. Also, we showed an entire architecture of the software defined real-time GNSS spoofing device.

Keywords: spoofing, software defined radio, GNSS, GPU