Simulation of restrain of radar´s multi-path effect

When radar traces the target in low altitude, because of multi-path effect, radar echo wave gets interfered and phenomenon of false alarm or false dismissal occurs, which even can lead to losing target. This paper proposes a separating algorithm that utilizes time-frequency clustering characteristic of Fractional Fourier Transform combing features of multi-path signal. The parameter estimation algorithm based on semi-blind signal processing is also adopted. The paper models the process of blind signal which fits low altitude tracking measurement, solves optimal estimation with simulated annealing algorithm and separates direct wave and reflected wave among multi-path signal to decline multi-path error and increase accuracy of tracking measurements.