HD Radio, originally developed by iBiquity Digital Corporation, is a trademarked term for the in-band on-channel (IBOC) digital radio technology used by AM and FM radio stations. is the only digital system approved by the FCC for digital AM/FM broadcasts in the US. It is officially known as NRSC-5, with the latest version being NRSC-5-D. More than 1,900 stations covering approximately 84% of the U.S. are broadcasting with this technology. Digital information is transmitted using OFDM with an audio compression algorithm called HDC (High-Definition Coding). Our project is receiving those HD radio signals from different radio stations around Cincinnati. Every signal has its own time from transmitter to our receiver which is Ettus USRP B210. After we received the HD radio signals, we can correlate it with the reference subcarriers which is generated locally. Those reference subcarrier are created following the standard of HD radio signal, NRSC-5. The correlation result is the relative TOA, which is our goal of this project.