Indoor-Positioning in DVB-T/T2 Single-Frequency Networks Using Inverse Passive Radar Approach

Wide signal bandwidth and precisely time-synchronized single-frequency network predetermines DVB-T and its successor DVB-T2 for Signals of Opportunity (SoP) radio positioning. Previously published methods were based on demanding OFDM symbol synchronization, partial (synchronization subcarriers only) reconstruction, and conventional positioning calculation. Their presented error was around 100 meters and more for the outdoor scenario. Our contribution focuses on an indoor scenario and novel signal processing method using a less demanding computation of autocorrelation function of in single-network present signals. This approach, inverse to passive-radar, exploits total signal bandwidth and is independent of apriori knowledge of signal structure. Then, it is combined with a direct positioning - collective detection metric method for position calculation. Absolute and relative positioning is considered to achieve target error under 50 meters, focusing on positioning IRS (Integrated Rescue Systems) services in dense indoor environments.