Range and Doppler Correction of Ubiquitous Radar Targets Based on the Maximum Image Sharpness

The ubiquitous radar can improve the detection probability of weak targets by long-time coherent integration called staring detection. However, long-time coherent integration can increase the two-dimensional movement of the target, i. e. range and Doppler movement, leading to defocusing of the target in the RD domain and decrease SNR. Effective two-dimensional movement correction can better reflect the staring characteristics of the ubiquitous radar and improve the radar detection performance. In this paper, firstly, using the keystone transform to correct the range movement. Secondly, establish the mathematical relationship between the Doppler movement and image definition. Based on the maximum image sharpness, correct the Doppler movement， this method solves the two-dimensional movement problem for staring detection and improves the high resolution of the target in the Doppler dimension, but also enhances the ability to detect weak targets.