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| 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
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A Waveform Design Method Based on Nonlinear Frequency Modulation and Space-coding for Coherent Frequency Diverse Array Radar
DOI: 10.12000/JR21008
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Abstract
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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References
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- Figure 1. The comparison of time-angle transmit beampatterns
- Figure 2. Beam pointing of FDA radar at different instances within pulse in polar coordinates
- Figure 3. The time-frequency relationship of the coherent FDA radar (blue) and the phased array radar (red)
- Figure 4. The comparisons of spectrum shape and range auto-correlation function between Tangent FM and LFM signals
- Figure 5. The comparisons of the array beampattern and the received signal spectrum before and after hybrid coding
- Figure 6. Range-Doppler ambiguity function
- Figure 7. Angle-angle ambiguity function
- Figure 8. Range-angle ambiguity function
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Figure 9. The variation curves of pulse compression performance indexes changing with
$\alpha $ - Figure 10. Range imaging results of three targets
- Figure 11. Pulse compression output for moving targets with high speed