Signals intelligence
Signals intelligence (SIGINT), a discipline overlapping with ES, is the related process of analyzing and identifying intercepted transmissions from sources such as radio communication, mobile phones, radar or microwave communication. SIGINT is broken into three categories: electronic intelligence (ELINT), communications intelligence (COMINT), and foreign instrumentation signals intelligence FISINT. Analysis parameters measured in signals of these categories can include frequency, bandwidth, modulation, and polarization.