arXiv:2611.06236v1 Announce Type: new Abstract: Integrated Sensing and Communication (ISAC) systems can reuse 5G New Radio (NR) reference signals to enable joint communication and environmental sensing. Among these signals, the Positioning Reference Signal (PRS) is particularly suitable for range and Doppler estimation. However, its comb structure introduces periodic ambiguities that generate ghost targets. Existing solutions resolve these ambiguities by combining PRS with additional signals such as the DeModulation Reference Signal (DMRS), which increases sensing overhead. This paper proposes a PRS-only sensing framework that resolves ambiguities using multi-static observations. Instead of removing ghosts locally at each receiver, the proposed method exploits spatial diversity and performs ambiguity resolution at a fusion anchor. The anchor jointly estimates target locations and ambiguity indices via multilateration across multiple sensing nodes. This approach eliminates the need for additional reference signals while maintaining low receiver complexity. Simulation results show that the proposed method reliably resolves ghost targets and achieves superior detection performance compared to benchmark methods across various scenarios, while significantly enhancing resource efficiency by enabling sensing using PRS-only transmissions.