By calculating the time delay between the transmitted pulse and the received pulse (denoted by $d$ in Fig 2), we can accurately determine the range of the object. In Fig 7 below, we observe that when sweeping the matched filter across the received signal containing two echo pulses, we first encounter a peak corresponding to the first object. This occurs because decreasing the pulse width of the transmitted pulse also reduces the energy transmitted per pulse, resulting in less powerful signal returning from the target.