“…PBR exploits existing transmitters as illuminators of opportunity to perform target detection and localisation, while avoiding radio frequency emissions, resulting in covert operation, low vulnerability, low cost, reduced impact on the environment etc. Among all the emitters available in the environment, digital broadcasters with orthogonal frequency division multiplex (OFDM) modulation, such as digital radio mondiale [9, 10], digital audio broadcasting [11], digital video broadcasting [12, 13], China mobile multimedia broadcasting (CMMB) [14], and digital terrestrial multimedia broadcasting (DTMB) [15], supply some of the most attractive choices, owing to their good signal characteristics and excellent coverages.…”