Design and Analysis of Target Echo Signal Generation System for Frequency-Agile Radar Based on FPGA

Abstract

In order to improve the verification efficiency of signal processing algorithms for frequency-agile radar, a design method of target echo signal generation for frequency-agile radar based on FPGA is proposed. This method adopts the idea of item-by-item restoration of the echo signal phase, by establishing a mathematical model of the stepped frequency waveform echo signal, it solves the real-time phase of target echo for the target relative uniform radial motion based on FPGA, and the problem of real-time generation of target echo for frequency-agile signals. Simulation results show that in both uniform and non-uniform motion states of the target, the effectiveness and accuracy of the echo generation system is verified. By comparing the target echo phase change curves with and without velocity compensation, the target high-resolution one-dimensional distance image, and the fine-resolution distance cell numbers of the neighboring three frames echo signals, the echo phase with velocity-compensation for uniform velocity motion target is varies linearly between -π and π, and the difference of fine-resolution distance cell numbers is 10 and 10, 9 in turn at uniform and non-uniform motion states of the target.

Keywords

• |target echo|frequency-agile signal|fpga|high-resolution one-dimensional range image|target rela-tive uniform motion