Digital Spectrum Sensing for the Localization of Public Safety Responders

This project has developed a modular sensor network to localize two-way radio transmitters without transmitter cooperation. The sensor network is capable of detecting the spectral location of signals, as well as the transmitting radioÂ’s modulation scheme through the use of a matched filter and autocorrelation spectrum sensing scheme. Each receiving node in the sensor network is capable of identifying a signal as an analog FM or Public Safety P25 transmission. After a signal has been identified, the control center attempts to localize the signal based on the received signal strength (RSS). The sensor network collects information about the transmitters in its environment and displays the transmitters center frequency, modulation scheme, and position as outputs on the central controller