PURPOSE: To decrease the erroneous warning rate of a system, which detects targets in a scene by an MTI processing method and to enhance the detecting probability. CONSTITUTION: A memory 12, which stores the first frame of the image data of an input signal Io , a first space filter means 16, which processes the second frame of the image data for supplying an output signal ηs Io of the first space filter, and a subtractor 14, which subtracts the first frame from the second frame of the image data with ηD as the scale of the target agreement of the first and second frames of the image data and outputs the difference signal ηDIo , are provided. Furthermore, a second space filter means 18, which outputs the difference signal ηs ηDIo that is filtered and processed in a space, and a means 30, which processes the difference signal that is obtained by filtering and processing the form νs νDIo for obtaining the above described scale λDof the target agreement, are provided.
AMPLITUDE-RATIO DISCRIMINATING SYSTEM FOR MTI PROCESSOR