Analysis of Constraints on the Remote Application of Inverse Synthetic Aperture Laser Radar
Abstract
:1. Introduction
2. Basic Principle
2.1. ISAL (Space-Based) Remote Detection Principle
2.2. Coherent Detection Principle
3. Simulation Analysis of the Core Influencing Factors on Remote Applications
3.1. Analysis of Influencing Factors of Laser Power on Remote Applications
3.1.1. Analysis of Influence Factors on Power of Continuous Fiber Laser
3.1.2. Analysis of Influence Factors of Pulsed Laser Power
3.2. Analysis of Influencing Factors of Coherence on Remote Applications
3.2.1. Analysis of Factors Affecting Coherence of Continuous Fiber Lasers
3.2.2. Analysis of Influencing Factors of Coherence of Pulsed Laser
4. Coherence Compensation Scheme
4.1. Large-Travel Fast-Variable Fiber Delay Line Topology Based on Magneto-Optic Switch
4.2. Other Coherence Compensation Methods
5. Conclusions
- (1)
- The remote detection performance of fiber lasers is being studied. The simulation results show that the continuous fiber laser can be used to detect operating distances of 22 km and below without compensation. Between 22 km and 57 km, coherent compensation is required.
- (2)
- By choosing a pulsed solid-state laser to adjust the coherence length within the range of 57 km to 3000 km, while considering the limited pulse width and SBS threshold power, it is determined that coherence compensation is necessary for distances spanning from 57 km to 3000 km. In addition, it is proposed that an angle reflector (cooperative target) can be used to reduce the power demand for detection, thus enabling longer distance detection. The text explains the difficulty of compensation for cooperative and non-cooperative goals, respectively.
- (3)
- Some mature schemes for optical coherence compensation are presented.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Physical Parameter | Physical Meaning | Numerical Value |
---|---|---|
SNR | Image signal-to-noise ratio | 1/3/5 dB |
Target backscatter solid angle | π | |
Electronic noise figure | 3 dB | |
Atmospheric transmittance | 1 | |
System loss | 0.18 | |
Pulse width | 5 μs | |
Transmission gain | 33.5 × 106 | |
Target scattering area | 2.5 × 10−4 m2 | |
Effective receiving area of the telescope | 4π m2 |
Physical Parameter | Physical Meaning | Numerical Value |
---|---|---|
K | Polarization-dependent factor | 1 |
G | Brillouin gain coefficient | 25.9686 |
Aeff | Optical fiber mode field area | 7.07 × 10−10 m2 |
gB | Peak Brillouin gain | 5 × 10−11 m/W |
∆νB | Brillouin scattered light bandwidth | 30 MHz |
Leff | Effective length of fiber | 0.998 m |
Detection Range | Compensating Distance | Compensation Accuracy | Simultaneous Switch |
---|---|---|---|
57 km | 114 km | 2 | 26, 25, 23, 22, 21, 20, 18, 16, 14 |
652 km | 1304 km | 6 | 30, 27, 26, 25, 24, 23, 20, 18, 17, 16 |
1000 km | 2000 km | 2 | 30, 29, 28, 27, 25, 20, 17 |
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Gao, R.; Dong, L. Analysis of Constraints on the Remote Application of Inverse Synthetic Aperture Laser Radar. Sensors 2024, 24, 3381. https://doi.org/10.3390/s24113381
Gao R, Dong L. Analysis of Constraints on the Remote Application of Inverse Synthetic Aperture Laser Radar. Sensors. 2024; 24(11):3381. https://doi.org/10.3390/s24113381
Chicago/Turabian StyleGao, Rui, and Lei Dong. 2024. "Analysis of Constraints on the Remote Application of Inverse Synthetic Aperture Laser Radar" Sensors 24, no. 11: 3381. https://doi.org/10.3390/s24113381
APA StyleGao, R., & Dong, L. (2024). Analysis of Constraints on the Remote Application of Inverse Synthetic Aperture Laser Radar. Sensors, 24(11), 3381. https://doi.org/10.3390/s24113381