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摘要:
弹道导弹在飞行中段形成目标群，窄带雷达无法从距离上将弹道目标分离。为使窄带雷达具备分离弹道目标的能力，对弹道目标的微动特性进行研究。对振动目标的信号回波进行建模，分析其在离散正弦调频变换（DSFMT）中的聚敛特性。利用多分量信号在变换域中的聚敛特性，实现不同信号分量的分离，并估计出目标的振动频率。仿真实验表明，在信噪比-10 dB下，多个振动目标散射点的窄带雷达回波在DSFMT域上具有明显的聚敛特性，分辨出了不同的振动散射点，振动频率估计均方根误差小于-2.5 dB。
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关键词:
- 微动 /
- 弹道中段 /
- 窄带雷达 /
- 离散正弦调频变换(DSFMT) /
- 目标分离
Abstract:The ballistic missile forms a target group in its mid-flight, and the narrowband radar cannot separate the ballistic target from the distance because of its narrow bandwidth. In order to enable narrowband radar to separate ballistic targets, the micro-motion characteristics of ballistic targets were studied. The narrowband radar signal echo of vibration target was modeled and its convergence characteristics in discrete sinusoidal frequency modulation transform (DSFMT) domain were analyzed. The convergence characteristics of multi-component signals in the transform domain were studied to separate different signal components and the vibration frequency of the target was estimated. The simulation results show that the narrowband radar echoes of multiple vibration ballistic targets have obvious convergence characteristics in the DSFMT domain under the signal to noise ratio of -10 dB, the proposed algorithm can distinguish different vibration scattering points, and the estimated vibration frequency root mean square error is less than -2.5 dB.
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图 2 窄带回波信号正弦调频变换结果
Figure 2. Sinusoidal frequency modulation transform result of narrowband echo signal
图 4 初始信号第1次离散正弦调频变换结果
Figure 4. First discrete sinusoidal frequency modulation transform result of initial signal
表 1 原始参数与估计结果
Table 1. Original parameters and estimation results
散射点 L k 理论值 估计值 理论值 估计值 P1 155.777 155.770 5.000 5.000 P2 190.081 187.105 5.900 5.900 P3 184.325 184.320 3.900 3.900 
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