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| Citation: | LI Yueli, MA Meng’en, ZHAO Chonghui, et al. Forward-looking Imaging via Doppler estimates of sum-difference measurements in scanning monopulse radar[J].Journal of Radars, 2021, 10(1): 131–142. doi: 10.12000/JR20111
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Forward-looking Imaging via Doppler Estimates of Sum-difference Measurements in Scanning Monopulse Radar（in English）
DOI: 10.12000/JR20111
More Information-
Abstract
Monopulse technique is used in scanning radar systems to improve image quality in the forward-looking area. However, monopulse measurements fail to resolve multiple targets in the same resolution cell because of angular glint which often results to image blurring. In response to this, we propose a monopulse forward-looking imaging method utilizing Doppler estimates of sum-difference measurements. First, target multiplicity is resolved by exploiting the different Doppler shifts caused by the relative motion between the platform and the targets at different directions. High azimuthal angle measurement accuracy of the Doppler estimates is then obtained using the Sum-Difference Amplitude-Comparison (SDAC) monopulse technique. Subsequently, the intensity of the sum channel estimates is projected onto the image plane according to the range and angle measurements. To further improve the precision of angle measurements, a Chirp-Z Transform (CZT)-based algorithm is proposed for the reconstruction of the Doppler estimates of the sum-difference channels. Simulation results demonstrate the capability of the proposed methods in resolving multiple targets at high squint angles in a large scanning field. Real data experiments show significant improvement of image profiles using the CZT-based algorithm compared to that of the conventional monopulse imaging method. -
References
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- Figure 1. Geometry for forward-looking imaging of a scanning radar
- Figure 2. Flowchart of mono pulse forward-looking imagination based on Doppler estimates
- Figure 3. Flowchart of monopulse forward-looking imaging based on the reconstructed Doppler estimates
- Figure 4. Comparison of forward-looking imaging performance (SNR=20 dB)
- Figure 5. Azimuthal contour plots for point targets at the range cell 1730 m (SNR=20 dB)
- Figure 6. Comparison of experimental results in forward looking imaging
- Figure 7.
- Figure 7. Comparison of experimental results in forward-looking imaging
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