Scatterers' migration in ISAR imaging and compensation

The range-Doppler (RD) method is the most commonly used method in ISAR imaging. To obtain a radar image of a target, a certain rotation angle of the target with respect to radar line of sight during the coherent integration interval is required. In such cases, there will be scatterer migration. Actually, scatterer migration through resolution cells (MTRC) will happen inevitably in high-resolution radar images, which will result in the point-spread function broadening and image resolution decreasing. The scatterer migration is discussed, and a simple and efficient method is proposed to correct MTRC. Compensation results of simulated data and real data collected in a microwave anechoic chamber show that the resolution of the final radar image is improved.