1. A system for establishing a signature of a device emitting electromagnetic radiation (EMR), comprising: a radio frequency (RF) receiver configured to sample detected EMR, generate pulses having characteristics that are a function of the EMR, and select pulses in a spectral band having energy above a predetermined threshold; a signal processor configured to establish a set of correlated pulses from among the selected pulses; and a signature generator configured to compute a vector space associated with the set of correlated pulses, compare each pulse in the set of correlated pulses to a basis of the vector space for establishing a device signature, and associate pulses having a threshold percentage of energy within the basis in a database with a device identifier.