1. A radar system for protecting an area of terrain that includes spaces covered with vegetation, said system comprising a fixed-antenna UHF radar designed and configured to cover the area in question, the radar transmitting bursts of pulses, integrating the signal received over a given integration time T i and temporally sampling the received signal with a given sampling pitch that defines a signal analysis cell, or distance bin, the integration time for the received signal and the size of the distance bin being defined in such a way that, taking into account the range of speeds of the targets of interest corresponding to potential intruders, a moving target of interest travels a distance shorter than the size of the distance bin from one integration period to another and the radar implementing a method of forming radar blips from the received signal, said method comprising: a first step of forming elementary blips from the signals received over the chosen integration time; a second step of storing the elementary blips formed, the elementary blips formed being stored from one burst to another and the duration of a burst corresponding to the integration time; a third step of confirming the elementary blips formed, by comparing the attributes of elementary blips formed for two successive bursts and located within the same distance bin or in two adjacent distance bins, an elementary blip formed for a burst p being confirmed if, during the burst p−1, an elementary blip having attributes with values substantially identical to those of the attributes of the elementary blip in question was formed in the same distance bin or in an adjacent distance bin; a fourth step of forming aggregate blips from confirmed elementary blips, an aggregate blip having attributes depending on the attributes of the confirmed elementary blips used to form the aggregate blip in question; and a fifth step of validating the aggregate blips formed during the fourth step, the validation of an aggregate blip being based on criteria defined depending on whether it is formed from confirmed elementary blips situated in one and the same distance bin or based on confirmed elementary blips situated in two adjacent distance bins, the validated aggregate blips being transmitted to the tracking means of the radar.