Volume 10 Issue 6
Dec.  2021
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YU Lei, HE Feng, DONG Zhen, et al. A waveform design method based on nonlinear frequency modulation and space-coding for coherent frequency diverse array radar[J]. Journal of Radars, 2021, 10(6): 822–832. doi: 10.12000/JR21008
Citation: YU Lei, HE Feng, DONG Zhen, et al. A waveform design method based on nonlinear frequency modulation and space-coding for coherent frequency diverse array radar[J]. Journal of Radars, 2021, 10(6): 822–832. doi: 10.12000/JR21008

A Waveform Design Method Based on Nonlinear Frequency Modulation and Space-coding for Coherent Frequency Diverse Array Radar

doi: 10.12000/JR21008
Funds:  The National Natural Science Foundation of China (61771478)
More Information
  • Corresponding author: HE Feng, hefeng@nudt.edu.cn
  • Received Date: 2021-01-26
  • Rev Recd Date: 2021-03-26
  • Available Online: 2021-04-19
  • Publish Date: 2021-04-19
  • A Frequency Diverse Array (FDA) radar achieves the uniform coverage of a large-scale airspace within a pulse duration by introducing a designed carrier frequency increment between adjacent transmitting elements. Unfortunately, the beam scanning property of an FDA radar leads to a reduction in dwell time at certain azimuth direction, which results in the deterioration of the range resolution. To solve this problem, we propose a novel coherent FDA radar waveform in the space-time domain, in which spatial phase encoding is introduced between transmitting elements to significantly improve the range resolution of a coherent FDA radar. A nonlinear frequency modulation signal is also used in the time domain to obtain a low-range Peak to SideLobe Ratio (PSLR). Simulation results verify that the proposed FDA radar waveform design realizes both a low PSLR and high range resolution. Finally, we analyze the Doppler sensitivity of our proposed method for the observation of high-speed moving targets.

     

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