Abstract: An image corresponding to an aspect angle computed from tracking data of a target is read out from an actual measurement data base as a reference image, is subjected to a relativity processing with the obtained image of the target in a relativity processor, and a result of the processing is displayed on a display unit.

Abstract: An apparatus is disclosed for detecting the shape of an object by means of radar. A transmitter 1 forms signal units wherein the transmitting frequency is varied continuously and linearly within a predetermined frequency bandwidth. By repeating this signal unit at fixed periods, a transmitting signal having a continuous waveform is generated. A receiver 5 detects signals reflected from a target 11, and converts them to video signals. An A/D converter 6 samples these video signals and digitizes them. The digitized video signals are stored in a first two-dimensional memory 7 according to a transmitting frequency index and a transmitting period index. A range compression device 8 resolves sequences of these digital video signals in a range direction by performing an inverse Fourier transformation on columns of data stored in the memory 7 which have the same transmission period.