×

Interferometric moving vehicle imaging apparatus and method

  • US 5,818,383 A
  • Filed: 10/28/1994
  • Issued: 10/06/1998
  • Est. Priority Date: 11/27/1981
  • Status: Expired due to Fees
First Claim
Patent Images

1. A radar system which transmits a pulsed waveform from a multi-aperture antenna having at least three apertures and receives backscattered energy from stationary and moving objects illuminated by each of the apertures and processes the signals received by each aperture separately to provide a plurality of received signals which are pulse compressed, motion compensated and transformed to the range doppler domain to provide a plurality of compensated received signals which are processed to form images of the stationary and moving objects, the system comprising:

  • signal processing apparatus responsive to at least one of the plurality of compensated received signals for forming an image of the stationary objects; and

    interferometric moving target focusing apparatus which receives and partitions the compensated received signals for at least three of the apertures into temporal subdwell data blocks, and corrects said subdwell data blocks for the differences in the phase centers of their associated apertures, and interferometrically combines the subdwell data blocks to attenuate the return energy associated with stationary objects and provide a first clutter canceled data block and a second clutter canceled data block which are further processed to detect moving objects, by comparing the magnitude and phase angle of the various return signals in said first and second clutter canceled data blocks to detect the moving objects, and combining said first and second clutter canceled data blocks in the range doppler domain to form a range doppler image of the detected moving objects.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×