P波段步进线性调频雷达半实物仿真研究
Hardware-in-the-loop Simulation of P-band Radar with Stepped Frequency Chirp Signals
  
DOI:
中文关键词:  步进频,线性调频,宽带雷达,半实物仿真
英文关键词:stepped frequency, chirp, wide-band radar, hardware-in-the-loop simulation
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作者单位
牛晴晴1,2张祥坤1,2 1. 国家空间科学中心 中国科学院微波遥感技术重点实验室,北京 100190
2. 中国科学院大学 电子电气与通信工程学院,北京 100049 
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中文摘要:
      步进线性调频信号是雷达系统中提高距离向分辨率的一种重要的信号形式。其有效降低了雷达高分辨率目标对硬件系统带宽的要求,以多个窄带信号综合的形式降低了雷达系统中DDS 信号源的带宽要求以及数据采集单元中AD 的采样率要求。半实物仿真可以方便、高效、低成本地验证雷达信号性能。搭建半实物仿真系统时主要使用的仪器是信号源和频谱仪。仿真时,在频域进行宽带合成,然后经过IFFT 变换到时域,通过对比信号的主瓣宽度来判断距离向分辨率的高低。实验结果表明随着步进次数的增多,距离向分辨率逐次提高。半实物仿真验证了步进调频技术提高距离向分辨率的技术路线,并为实际雷达系统设计提供了初步技术方案和参数优选手段。
英文摘要:
      Stepped frequency chirp signal is an important signal form to improve range resolution in radar system. It effectively reduces the requirements of high-resolution radar target on hardware system bandwidth, and reduces the requirements of bandwidth in DDS signal generator and AD sampling rate in data acquisition unit in the form of multiple narrow-band signal synthesis. Hardware-in-the-loop simulation can verify the radar signal performance conveniently, efficiently and cheaply. The main instruments used in building the hardware-in-the-loop simulation system are signal generator and spectrum analyzer. In the simulation, wideband synthesis is performed in the frequency domain, and then the IFFT is carried out, which is transformed into the time domain, and the resolution of the distance of the signal is judged by comparing the main lobe width of the signal. The experimental results show that the range resolution increases with the number of steps. Through the hardware-in-the-loop simulation, the technical route of using stepped frequency modulation technology to improve range resolution is verified, and the preliminary technical scheme and parameter optimization method are provided for the actual radar system design.
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