1. A target identifier comprising one or more computing devices having machine readable instructions, the target identifier being configured to: determine a synthesized profile for a target based on active sensor data that characterizes a radio frequency (“RF”) signal reflected by the target and received at an active sensor system, wherein the synthesized profile characterizes an estimated Line of Bearing (“LoB”) and a radial speed (“Rdot”) of the target relative to a passive sensor system; and match the synthesized profile with a measured profile that is determined based on RF signals received at the passive sensor system, wherein the measured profile characterizes a measured LoB and a measured Rdot of the target.