Multi-Resolution STAP for Enhanced Ultra-Low-Altitude Target Detection
Abstract
:1. Introduction
- i
- We not only circumvent the target attenuation induced by the multipath signal, but also exploit the multipath signal power to enhance the ULAT detection performance. In specific, the mechanism of the MTC effect is derived for the fast searching of SCNR-enhanced sub-band distribution. Furthermore, the consistent CCM estimation scheme is proposed in the sub-band STAP to reduce computational burden, and the clutter training sample selection scheme is also proposed to satisfy the sample demand.
- ii
- By dividing the whole base band into multiple independent sub-bands, it is feasible to improve the target detection performance with the joint complementary detection among multiple sub-band STAP outputs.
- iii
- On the basis of the SCNR-enhanced sub-band STAP detection results, the dynamic TG-induced target attenuation is further alleviated by multipath-target decoupling with the full-band STAP, which constrains the target Doppler history and provides the foundation for further SCNR improvement within the long-CPI.
2. Signal Model
2.1. Geometric Configuration and Multipath-Target Signal Model
2.2. Space-Time Signal Model
3. Multi-Resolution STAP Based ULAT Detection
3.1. SCNR-Enhanced Sub-Band STAP
3.1.1. Mechanism Analysis of MTC Effect
- i
- The of the SCNR-enhanced sub-band distribution keeps constant with different , because the maximum possible output power is produced under the in-phase envelope superposition condition, which corresponds to a specific .
- ii
- The SCNR performance trend of the sub-band STAP is stable and periodic with respect to the of the sub-band distribution, because of the periodicity of the -dependent phase coupling in the envelope superposition.
3.1.2. Joint Multiple Sub-Bands ΣΔ-STAP
3.2. Full-Band STAP Based Multipath-Target Separation
4. Performance Analysis
4.1. Mechanism Validation of MTC Effect
4.1.1. Numerical Analysis
4.1.2. Experimental Analysis
4.2. Experiment Results of Joint Multi-Resolution STAP
5. Conclusions
Author Contributions
Funding
Conflicts of Interest
Appendix A. Derivations of Sub-Band Range-Compressed Envelope for Target
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Parameter | Value | Parameter | Value |
---|---|---|---|
Carrier frequency | 14.5 GHz | Waveform type | LFM |
Full-band width | 80 MHz | Sub-band width | 20 MHz |
Sampling frequency | 192 MHz | Pulse width | 1 µs |
Center Frequency of Sub-Band | Target | Multipath |
---|---|---|
−3 MHz | −7.50 deg | 165.08 deg |
15 MHz | −7.50 deg | −3.67 deg |
Parameter | Value | Parameter | Value |
---|---|---|---|
Platform height | 1.247 km | Platform velocity | 80 m/s |
PRF | 20 KHz | Beam elevation direction | 9.96 deg |
CPI | 6.4 ms | Beam azimuth direction | 84.5 deg |
Guard cells | 50 | Full-band training samples | 200 |
Parameter | Value | Parameter | Value |
---|---|---|---|
CPI | 25.6 ms | Beam azimuth direction | 84.5 deg |
Guard cells | 50 | Full-band training samples | 200 |
Method | STAP Output SCNR | Output SCNR of Further Coherent Accumulation | Computational Consuming Time |
---|---|---|---|
Proposed multi-resolution STAP | 8.25 dB | 40.04 dB | 4.34 s |
Mono-resolution STAP | 20.35 dB | 35.77 dB | Null |
Conventional full-band STAP | 4.75 dB | Null | 3.37 s |
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Li, H.; Liao, G.; Xu, J.; Zeng, C.; He, X.; Gao, P. Multi-Resolution STAP for Enhanced Ultra-Low-Altitude Target Detection. Remote Sens. 2021, 13, 4212. https://doi.org/10.3390/rs13214212
Li H, Liao G, Xu J, Zeng C, He X, Gao P. Multi-Resolution STAP for Enhanced Ultra-Low-Altitude Target Detection. Remote Sensing. 2021; 13(21):4212. https://doi.org/10.3390/rs13214212
Chicago/Turabian StyleLi, Haodong, Guisheng Liao, Jingwei Xu, Cao Zeng, Xiongpeng He, and Pengfei Gao. 2021. "Multi-Resolution STAP for Enhanced Ultra-Low-Altitude Target Detection" Remote Sensing 13, no. 21: 4212. https://doi.org/10.3390/rs13214212
APA StyleLi, H., Liao, G., Xu, J., Zeng, C., He, X., & Gao, P. (2021). Multi-Resolution STAP for Enhanced Ultra-Low-Altitude Target Detection. Remote Sensing, 13(21), 4212. https://doi.org/10.3390/rs13214212