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| Citation: | ZHANG Shunsheng, LIU Meihui, and WANG Wenqin. FDA-MIMO radar moving target detection based on Doppler spread compensation[J]. Journal of Radars, 2022, 11(4): 666–675. doi: 10.12000/JR22042
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FDA-MIMO Radar Moving Target Detection Based on Doppler Spread Compensation
DOI: 10.12000/JR22042
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Abstract
When Frequency Diverse Array and Multiple-Input Multiple-Output (FDA-MIMO) radar detects moving targets, the frequency offset between transmitting arrays is coupled with the target velocity, resulting in severe Doppler spread in the slow time dimension. Further, the signal energy of each receiving channel cannot be coherently accumulated, thereby greatly reducing the detection performance of the system. To address this problem, a method of FDA-MIMO radar moving target detection based on Doppler spread compensation is proposed. Firstly, the moving target echo model of FDA-MIMO radar is established, and the Doppler spread caused by the frequency offset is analyzed. After establishing the maximum likelihood receiver model, a resampling method based on an interpolation filter is proposed to compensate for the Doppler spread caused by FDA-MIMO radar during the detection of moving targets. Simulation results reveal that the proposed method can suppress the Doppler spread, compensate for the cross-cell migration of subtarget echo in the range dimension, and realize the coherent accumulation of signal energy. -
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References
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- Figure 1. FDA-MIMO radar transmit and receive array model
- Figure 2. Maximum likelihood receiver model for FDA-MIMO radar
- Figure 3. Schematic diagram of range migration and Doppler spread
- Figure 4. The flowchart of moving target detection for FDA-MIMO radar
- Figure 5. The Doppler frequency center of each channel of the first receiving array element
- Figure 6. The range Doppler two-dimensional graph of each channel signal of the first receiving array element before and after using the algorithm
- Figure 7. Coherent accumulation results with uncompensated Doppler spread
- Figure 8. Coherent accumulation results with compensated Doppler spread
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Figure 9. When the frequency offset
$ \Delta f = 10 $ - Figure 10. When the coherent processing time is 96 ms, the gain of coherent accumulation varies with frequency offset
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Figure 11. Detection probability graph (
${P_{{\rm{fa}}}} = 0.001$