Abstract: A radio frequency imaging apparatus comprises a radio frequency receiver (16), which receives radio frequency electromagnetic radiation interacted with a non-stationary object (12) and forms, as a function of time, at least one property of the radio frequency radiation interacted with the object (12), the non-stationarity of the object (12) relating to at least one of the following: a direction from which the radio frequency radiation hits the object (12), a position of the receiver (16). A data gathering unit (18) gathers information on position and/or orientation of the object (12) as a function of time, and forms, as a function of time, information on position and/or orientation of the object (12) within the radio frequency radiation from the gathered data.