Ambiguity Suppression Based on Joint Optimization for Multichannel Hybrid and ±π/4 Quad-Pol SAR Systems
Abstract
:1. Introduction
2. Materials and Methods
2.1. Multichannel Hybrid and Quad-Pol SAR Systems
2.1.1. Multichannel Quad-Pol SAR
2.1.2. Sampling Frequency (PRF)
2.2. Reconstruction Methods for Multichannel Quad-Pol SAR
2.2.1. Conventional Matrix Inversion (MI) Method
2.2.2. Joint Optimization to Suppress the Ambiguity (JOSA)
3. Results
- (1)
- AASR for different polarizations after reconstruction;
- (2)
- RASR for different polarizations after reconstruction;
- (3)
- Output signal-to-noise ratio (SNR) for different polarizations.
3.1. Characterization of the Reconstruction and Performance
3.1.1. Effects of Reconstruction on Azimuth Ambiguity
3.1.2. Effects of Reconstruction on Range Ambiguity
3.2. Numerical Simulation Results of Reconstruction Methods
3.2.1. ASRs Performance of Single-Channel Quad-Pol SAR System (System #1)
3.2.2. ASRs Performance of Multichannel Quad-Pol SAR System (Systems #2 & #3)
3.2.3. Imaging Simulation Results
3.3. Effects of Reconstruction on Noise
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
Abbreviations
AASR | Azimuth ambiguity-to-signal ratio |
JOSA | Joint optimization to suppress the ambiguity |
MI | Matrix inverse |
PRF | Pulse repetition frequency |
RASR | Range ambiguity-to-signal ratio |
SNR | Signal-to-noise ratio |
SAR | Synthetic aperture radar |
UDR | Ratio of undesired azimuth signal power and desired azimuth signal power |
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Parameters | System #1 | System #2 | System #3 |
---|---|---|---|
Radar frequency | 5.4 GHz (C-band) | ||
Orbit height | 628 km | ||
Radar velocity | 7600 m/s | ||
Minimum ground range | 334 km | ||
Maximum ground range | 370 km | ||
Tilt angle | |||
Antenna type | Planar | ||
Antenna height | 2.1 m | ||
Tx antenna length | 8 m | 8 m | 8 m |
Rx antenna total length | 8 m | 8 m | 16 m |
Number of Rx channels | 1 | 2 | 2 |
Length of sub-antenna | – | 4 m | 8 m |
Antenna spacing | – | 4 m | 8 m |
Doppler bandwidth | 673 Hz | 838 Hz | 673 Hz |
Backscatter model | Ulaby and Dobson, shrubs |
Systems | System #1 | System #2 | System #3 | ||
---|---|---|---|---|---|
Methods | Combination | MI | JOSA | MI | JOSA |
HV | dB | dB | dB | dB | dB |
HH | dB | dB | dB | dB | dB |
VH | dB | dB | dB | dB | dB |
VV | dB | dB | dB | dB | dB |
Systems | System #1 | System #2 | System #3 | ||
---|---|---|---|---|---|
Methods | Combination | MI | JOSA | MI | JOSA |
HV | dB | dB | dB | dB | dB |
HH | dB | dB | dB | dB | dB |
VH | dB | dB | dB | dB | dB |
VV | dB | dB | dB | dB | dB |
Systems | System #1 | System #2 | |
---|---|---|---|
Methods | Combination | MI | JOSA |
VH | dB | dB | dB |
VV | dB | dB | dB |
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Zhao, P.; Deng, Y.; Wang, W.; Zhang, Y.; Wang, R. Ambiguity Suppression Based on Joint Optimization for Multichannel Hybrid and ±π/4 Quad-Pol SAR Systems. Remote Sens. 2021, 13, 1907. https://doi.org/10.3390/rs13101907
Zhao P, Deng Y, Wang W, Zhang Y, Wang R. Ambiguity Suppression Based on Joint Optimization for Multichannel Hybrid and ±π/4 Quad-Pol SAR Systems. Remote Sensing. 2021; 13(10):1907. https://doi.org/10.3390/rs13101907
Chicago/Turabian StyleZhao, Pengfei, Yunkai Deng, Wei Wang, Yongwei Zhang, and Robert Wang. 2021. "Ambiguity Suppression Based on Joint Optimization for Multichannel Hybrid and ±π/4 Quad-Pol SAR Systems" Remote Sensing 13, no. 10: 1907. https://doi.org/10.3390/rs13101907