PPABLK-A Computer Simulation of the Velocity Response of Moving-Target Indicator Radars Using Pulse or Block Stagger.

摘要

The program PPABLK is designed to analyze the velocity response of a moving-target indicator radar processor. The processor consists of identical in-phase and quadrature N sub m-tap transversal filters, whose outputs are combined as the square-root of the sum of squares. The incoming pulse train consists of N sub t pulses per beam position structured in N sub b blocks of N sub P (=N sub t/N sub b) pulses/block. The individual interpulse spacings can be staggered and a new set of N sub m tap gains, interpulse spacings, and transmitter frequency can be assigned to each block. The program can be used to simulate processors with moving-window filters (N sub P > N sub m) or fixed-window (N sub P = N sub n) filters and N sub b (N sub P - N sub n+1) successive outputs are added in a integrator. The processor amplitude response as a function of target velocity is computed and displayed using either a graphic terminal or line printer. Output data, in addition to a velocity response, includes a histogram of the amplitude response over a user-specified range of target velocities and a tabulation of the improvement factor, i.e., ratio of signal-to-clutter power ratios before and after filtering, as a function of the standard deviation of the Gaussian clutter power-density spectrum. (Author)