最大SCNR下的随机延伸目标探测波形设计

Waveform design for stochastic extended target detection in signal-dependent interference

针对慢起伏距离延伸静止目标探测问题,采用最大化信号杂波噪声比(SCNR)准则,进行了信号依赖的干扰和背景噪声共同作用下的最优发射波形设计研究。在慢起伏距离延伸目标模型设定下,给出了SCNR和发射波形能量谱(ESD)之间的关系式,并推导出了发射波形ESD的全局最优解;采用实测的干扰、背景和目标谱数据,合成了最优波形的ESD。在不同信号频带范围限定下,对比分析了最优波形和LFM信号所能给出的最大SCNR。仿真结果表明:该方法合成的最优波形所获得的最大SCNR总是高于参考LFM信号所获得的最大SCNR。

In order to make the detection of slowly fluctuating extended targets influenced by signal- dependent interference and additive ambient noises, an optimal transmitting waveform design algorithm is presented by the criterion of the maximum ignal-to-clutter-and-noise ratio （SCNR）. The analytical solution of the optimal signal energy spectral density （ESD） is derived from the relation between the SCNR and the ESD of transmitting signal. The optimal waveform is synthesized by use of the spectrum test data of interference, ambient noise and target. The maximum SCNR of optimal waveforms and LFM signals in different frequency bands are compared. The simulation results show that the maximum SCNR of optimal waveforms is always higher than that of LFM signals.