The beam-scan allows the terrain observation by progressive scans (TOPS) mode to cover large azimuthal scenes in a short time. which also causes aliasing in both Doppler domain and azimuth time domain. In the TOPS mode. the most popular solution to overcome the aliasing problem is the “sub-aperture” method. https://www.animationbengal.com/?w=mega-price-the-cafe-terrace-on-the-place-du-forum-arles-at-night-c-1888-sale-top-super