【摘要】 调频步进波形是一组脉内线性调频、脉间载频步进的脉冲串波形，可通过脉间相参处理实现全宽带合成。该波形可以降低系统发射瞬时带宽需求，通过消耗时间资源换取大带宽信号。文中围绕空天高速目标调频步进信号宽带成像问题，提出了一种高速目标调频步进波形解调频接收时域合成处理方法，建立高速目标调频步进信号解调频接收数学模型，详细分析了高速运动引起的脉内、脉间相位项及其补偿方法，通过数值仿真说明了文中方法可有效消除高速运动引起的成像散焦问题，实现了高速目标宽带合成高分辨距离成像，具有波形参数约束少、处理数据量小的特点。更多还原

【Abstract】 A stepped frequency-modulated waveform is a series of linear frequency-modulated pulse train with stepped carrier frequency, which achieve inter-pulse wideband high-resolution synthesis through inter-pulse coherent processing. The waveform can reduce the system′s requirement for instantaneous bandwidth during transmission, and acquire wideband signals by consuming time resources. In this paper, the problem of wideband imaging for high-speed targets in aerospace using stepped frequency-modulated signals is focused, and an approach for receiving and synthesizing the demodulated stepped frequency-modulated waveforms from high-speed targets in time-domain is proposed. A mathematical model is established for receiving demodulated stepped frequency-modulated signals from high-speed targets, and the intra-pulse and inter-pulse phase terms caused by high-speed motion and their compensation methods are completely analyzed. The numerical simulation demonstrates that the method proposed in this paper can effectively eliminate the issue of defocused imaging caused by high-speed motion, and achieve broadband synthesis and high resolution range profile of high-speed targets, featuring fewer constraints on waveform parameters and lower data volume.更多还原