Developed FM-CW Radar approach

One of the most disadvantages of continues radar system that it cannot calculate range because the time of transmitting the signal is unknown so we used one of communication system techniques that is frequency modulated wave signal which we can sweep frequency for a certain period so if signal is hit stationary target then it back to the station of radar with the same transmitted frequency and we now that frequency at what time have been transmitted so we can calculate beat frequency then range