Study Of Low Altitude Target Tracking Based On Ultra Wide Band Radar

Low altitude penetration is the most efficient artifice applied in modern warfare. The core problem of tracking target at low altitude is the multipath influence, when the phasic difference between direct path and reflect path varies in 0～2πwith the range between target and radar, the echoes (composed of direct path and reflect path) become glint. So in the paper, the key techniques for radar tracking are studied, which possess important theoretic meaning and obvious military benefits.Firstly, an environment model for low altitude and multi-scatters target model under ultra wide band radar are constructed and multipath echoes for a low altitude target is also simulinked. With the preference of SF signal, the difference in HRRP under different model and band is discussed. To track target, the monopulse angle measuring under wide band is introduced, which is good at angular glint. Then an auto-correlation method is proposed with the analysis of low altitude model, which obtains the multipath time delay through the auto-correlation of HRRP. To improve time resolution, an inverse chirp-Z translation (ICZT) method is proposed to sample intensely in the range interested, which could behave the details and estimate the height accurately.