Moving Real-Target Imaging of a Beam-Broaden ISAL Based on Orthogonal Polarization Receiver and Along-Track Interferometry
Abstract
:1. Introduction
2. Depolarization Effect of Laser Signals for Different Targets
2.1. The Influence of Depolarization Effect on Interferometry
2.2. Study on the Depolarization Effect of Different Targets
2.3. Study on the Depolarization Effect of Targets Corresponding to Light Sources with Different Polarization States
3. Introduction to Experimental System
4. ISAL Imaging Experiment of Moving Target
4.1. Signal Processing Flow
- Preprocess: the echo signal and the transmitted reference signal are preprocessed first, including Hilbert transform and harmonic interference removal.
- Parameter estimation: estimate the oblique angle, depression angle, and oblique distance according to the measured observation geometry, estimate the target motion velocity according to the infrared camera video, and conduct Doppler compensation for the echo signal in combination with the estimated parameters. The equation for calculating the Doppler frequency to be compensated is as follows:
- 3.
- Registration: perform fast-time alignment and slow-time alignment on data from two channels.
- 4.
- Estimation and compensation of vibration phase error: the signals of the two channels after registration are used for coarse-estimation of the vibration phase error using SCA, and then the vibration phase error is fine-estimation using the along-track interferometry.
- 5.
- Construction of matched filter: after compensating for the vibration phase error, the second-order phase generated by translational motion in the phase of the echo signal occupies the main component, and the matched filter is constructed according to the target motion velocity, and the frequency modulation rate of the matched filter is as follows:
- 6.
- Imaging: divide the sub-aperture according to the method in the literature [13] and use the Range-Doppler (RD) algorithm for imaging. The sub-aperture imaging results are then stitched and azimuthally multi-look processed to obtain the final imaging result. The duration of the imaging sub-aperture depends on the synthetic-aperture time. The relationship between the synthetic-aperture time T and the azimuth beamwidth, the slant distance R, the target movement speed V, the oblique angle, and the depression angle is as follows:
4.2. ISAL Imaging Results
5. Discussion
6. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
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Gao, J.; Li, D.; Wu, J.; Cui, A.; Wu, S. Moving Real-Target Imaging of a Beam-Broaden ISAL Based on Orthogonal Polarization Receiver and Along-Track Interferometry. Remote Sens. 2024, 16, 3201. https://doi.org/10.3390/rs16173201
Gao J, Li D, Wu J, Cui A, Wu S. Moving Real-Target Imaging of a Beam-Broaden ISAL Based on Orthogonal Polarization Receiver and Along-Track Interferometry. Remote Sensing. 2024; 16(17):3201. https://doi.org/10.3390/rs16173201
Chicago/Turabian StyleGao, Jinghan, Daojing Li, Jiang Wu, Anjing Cui, and Shumei Wu. 2024. "Moving Real-Target Imaging of a Beam-Broaden ISAL Based on Orthogonal Polarization Receiver and Along-Track Interferometry" Remote Sensing 16, no. 17: 3201. https://doi.org/10.3390/rs16173201