초록

A feature imaging and adaptive focusing synthetic aperture processing met provides improved sharpness and easier classification of images derived from radar and sonar echo data by applying adaptive focusing and feature imaging to a sequence of echo data.

대표청구항 ▼

[ I claim:] [1.] A feature imaging and adaptive focusing synthetic aperture process comprising the steps of:predicting expected echo delays between a sensor and a target for each pixel coordinate of an image representative of the target and its environment formed from echo data;calculating possible

[ I claim:] [1.] A feature imaging and adaptive focusing synthetic aperture process comprising the steps of:predicting expected echo delays between a sensor and a target for each pixel coordinate of an image representative of the target and its environment formed from echo data;calculating possible perturbations to the expected echo delays;beamforming image data of an echo sequence and constructing a test image for each possible or hypothesized echo delay perturbation at each pixel coordinate;calculating the mean square bandwidth of each test image;selecting the best test image having the largest value of mean square bandwidth resulting in the best local focus for each image pixel;subtracting the predicted expected echo delays from the perturbed delays of the best test image for each image pixel;estimating relative motion of the sensor with respect to each point of the imaged target and its environment;and constructing a motion compensated image from the best test image of the echo sequence.