现代雷达工作在极为复杂的电磁环境中,无线频谱资源被众多系统划分和占用,临近频段信号之间的干扰,将影响雷达系统的工作性能。在雷达发射信号的频谱中有针对性地设置零点,可以避免与外部信号的互相干扰。利用相位扰动技术,对雷达发射信号的相位做适当调整,能够灵活地使频谱在指定频率产生零点。信号幅度保持恒定,因而没有发射能量的损失,由于加入的相位扰动是微小的,雷达信号的固有特征几乎不受影响。相位编码信号是一种脉冲压缩信号,巴克码信号属于相位编码信号中的二相编码信号。文中基于相位扰动技术,研究巴克码序列编码信号的频谱置零处理,仿真和讨论了在巴克码信号频谱的主瓣和副瓣设置单个及多个零点的情况,并分析了误差条件下的置零特性。

Modern radars operate in very complex electromagnetic environments. The wireless spectrum is divided and used by a large amount of RF users. The signals at the near frequencies may interference with each other, disrupting the operation of radar systems. Radar transmitter忆s interference with other RF users can be reduced by producing nulls in the spectrum of radar signal. These nulls are readily formed at desired frequencies by modifying the phase structure of the given radar waveform. Since the radar waveform keeps constant amplitude, no transmit energy is lost. Phase perturbations are small; so that the signal’s inherent characteristics are maintained. Phase code signal is a kind of pulse compression waveform, and Baker code signal is one of the two-phase code signals. In this paper, based on phase perturbation technique, the spectral nulling of Barker-coded signals was studied. The single and multiple nulling in the main lobe and side lobes of the Barker code spectrum are simulated and discussed. And characteristic of the nulling under error conditions is analyzed.

TN957.51