The article is devoted to the problem of quickly measurement of the initial velocity of a mortar shell. In the article is carried out the simulation modeling of two optimal modifications of the radar response parameters meter from such a target. The structural diagrams of both modifications and the parameters of their analytical mathematical models are given and described. Numerical tests of both models are carried out for a test trajectory that simulates the uniformly decelerated motion of the shell. According to the simulation results, the values of the meters parameters, which ensure the monitoring of the radar response frequency from the shell during the entire observation time and in a wide range of changes in the energy potential, are determined. The possibility of significantly reducing the capture time of the radar response frequency is shown.