The definitions presented in this standard represent a consensus of UWB radar experts at the time of publication. Wherever possible, the definitions have been adopted from governing bodies such as the United States Federal Communications Commission (FCC) responsible for regulating commercial use of UWB radio and radar systems. For historical perspective, alternative definitions used before the establishment of government standards are also given. UWB radar is a field of radar that is finding multiple applications in the United States and internationally. The purpose of this standard is to promote clarity and consistency in the use of the terminology used in UWB radar applications. Changes to this standard are anticipated, and industry professionals in this area of practice are encouraged to communicate directly concerning issues with the current definitions, suggested changes, and/or the addition of new definitions.