In this study, the effect of delay in a simulated Global Positioning System (GPS) signal on the reacquisition time of a GPS receiver was experimentally analyzed. For this purpose, not only conventional GPS signals but also signal loss and subsequent delay were simulated. The proposed simulator was implemented with a software-defined radio, and the resulting simulated GPS signals were received and processed with a commercial GPS receiver. The results of the experiment show that as the delay increases, the reacquisition time also increases, thus confirming that the delay must remain within 0.5 s to maintain a reacquisition time within the hot start range of the receiver.

Keywords: GPS simulation, reacquisition time, software-defined radio