基于自适应Chirp表达的雷达多目标分辨

针对编队机群目标的低分辨雷达回波多普勒信号的线性调频数学模型，采用先作自适应Chirp信号分解再作维格纳维利分布（WVD）的自适应Chirp表示方法。由于分解所选基函数能够较好匹配雷达回波信号，因而在分析结果中产生的交叉项较少，同时具有较高的时频分辨率和抗噪声能力。采用自适应Chirp表示对实测编队目标的雷达回波信号进行分析，证明了该方法能够有效地实现雷达多目标分辨。

Accurate Radar Determination of Number of Targets in Multi-Target Flying Group

Past radar methods often led to a wrong answer to the number of targets in multi-target flying group. We present an accurate method based on a skillful combination of mainly two past research results: (1)according to Ref.2,a refinement of Ref.3, low-resolution radar Doppler signals from targets flying in group can be approximated by the linear frequency modulation model; (2)Ref.4 applied adaptive chirp representation to solving signal processing problems. Adaptive chirp representation(ACR) method firstly made an adaptive chirp decomposition,and then made Wigner-Ville Distribution(WVD). As the base functions used in ACR are quite matched to the radar signals, results from ACR are better in time-frequency resolution and cross terms are diminished,thus ensuring accurate determination of number of targets in multi-target flying group. A number of computer simulation experiments with real echo data of radar targets flying in group were made. Experimental results show that better resolution of radar multiple targets can be obtained by using ACR method. The good properties of suppressing interference and noise are preliminarily proved by the experiments.