Testing OFDM-based positioning using the digital TV signals

Recent regulatory incentives (E911) and numerous location-based services and applications currently require accurate urban and indoor positioning, which are challenging environments for Global Navigation Satellite Systems. This article investigates a means for enhancing positioning through the use of signals-of-opportunity based on the orthogonal frequency division multiplexing modulation. The use of digital video broadcast-terrestrial signals to develop and test a pseudorange estimation method employing real signals is presented. The test bench to do so is thoroughly presented. The first testing results with real signals are then investigated in an urban environment showing a potential accuracy of about 11 meters RMS with a mean bias on the order of 9 meters.