Spatial Baseline Optimization for Spaceborne Multistatic SAR Tomography Systems
<p>Spatial geometry model of a spaceborne multistatic synthetic aperture radar tomography (SMS-TomoSAR) system (normal-slant-range (nsr) direction).</p> "> Figure 2
<p>(<b>a</b>) Baseline equivalent schematic diagram of an SMS-TomoSAR system; (<b>b</b>) Schematic diagram of the symmetric-geometric baseline model.</p> "> Figure 3
<p>The baseline distribution with changing <math display="inline"><semantics> <mi>q</mi> </semantics></math> (take <span class="html-italic">MN</span> = 21 as an example).</p> "> Figure 4
<p>Imaging performance in the height direction: PSLR, ISLR, broadening coefficient. The blue dotted line in the figure only represents the imaging result when the baseline is uniformly distributed.</p> "> Figure 5
<p>The imaging results of NDFT and CS at <span class="html-italic">q</span> = 0.2, 0.6, 1.0, 1.4, and 1.8.</p> "> Figure 6
<p>The imaging performance along the deviation direction with <math display="inline"><semantics> <mrow> <mi>q</mi> <mo>=</mo> <mn>0.86</mn> <mo>∼</mo> <mn>1.16</mn> </mrow> </semantics></math>: PSLR, ISLR, broadening coefficient.</p> "> Figure 7
<p>The imaging performance with <math display="inline"><semantics> <mrow> <msub> <mi>B</mi> <mrow> <mi>s</mi> <mi>p</mi> <mi>a</mi> <mi>n</mi> </mrow> </msub> <mo>=</mo> <mn>500</mn> <mrow> <mo> </mo> <mi mathvariant="normal">m</mi> </mrow> </mrow> </semantics></math>: (<b>a</b>) PSLR; (<b>b</b>) ISLR.</p> "> Figure 8
<p>The imaging performance with <math display="inline"><semantics> <mrow> <msub> <mi>B</mi> <mrow> <mi>s</mi> <mi>p</mi> <mi>a</mi> <mi>n</mi> </mrow> </msub> <mo>=</mo> <mn>1000</mn> <mrow> <mo> </mo> <mi mathvariant="normal">m</mi> </mrow> </mrow> </semantics></math>: (<b>a</b>) PSLR; (<b>b</b>) ISLR.</p> "> Figure 9
<p>The imaging performance with <math display="inline"><semantics> <mrow> <msub> <mi>B</mi> <mrow> <mi>s</mi> <mi>p</mi> <mi>a</mi> <mi>n</mi> </mrow> </msub> <mo>=</mo> <mn>2000</mn> <mrow> <mo> </mo> <mi mathvariant="normal">m</mi> </mrow> </mrow> </semantics></math>: (<b>a</b>) PSLR; (<b>b</b>) ISLR.</p> "> Figure 10
<p>Imaging performance results when <math display="inline"><semantics> <mrow> <msub> <mi>e</mi> <mrow> <mi>max</mi> </mrow> </msub> <mo>=</mo> <mn>10</mn> <mo>%</mo> <mo>,</mo> <mo> </mo> <mn>20</mn> <mo>%</mo> <mo>,</mo> <mo> </mo> <mn>40</mn> <mrow> <mo>%</mo> </mrow> </mrow> </semantics></math>.</p> "> Figure 11
<p>The imaging results of SMS-TomoSAR and monostatic SAR.</p> "> Figure 12
<p>Simulated target.</p> "> Figure 13
<p>Results of the NDFT algorithm.</p> "> Figure 14
<p>Results of the CS algorithm.</p> ">
Abstract
:1. Introduction
2. Baseline Equivalence Analysis of SMS-TomoSAR
3. Three-dimensional Imaging Analysis of an SMS-TomoSAR System
4. Spatial Baseline Optimization Method for SMS-TomoSAR systems
4.1. Baseline Model Construction
4.2. Maximum Perturbation Estimation Method
5. Experimental Verification
5.1. Analysis of Imaging Intensity Results
5.2. Baseline Perturbation Analysis
5.3. Baseline Optimization Method Verification
6. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
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Parameter | Value | Parameter | Value |
---|---|---|---|
Main image height (m) | Target height (m) | ||
Number of formation satellites | Target complex scattering coefficient | ||
Number of flights | Target height span (m) | ||
Repeat-track vertical baseline length (m) | Same-track vertical baseline length (m) | ||
Baseline span (m) | Unambiguity height (m) |
DFT | NDFT | CS | |
---|---|---|---|
0.42 m/45.0° | 0.42 m/45.0° | ||
0.42 m/45.0° | 0.33 m/45.0° | ||
0.42 m/45.0° | 0.29 m/45.0° | ||
0.42 m/45.0° | 0.42 m/45.0° | ||
0.42 m/45.0° | 0.42 m/45.0° | 0.42 m/45.0° | |
0.42 m/45.0° | 0.42 m/45.0° | ||
0.42 m/45.0° | 0.42 m/45.0° | ||
0.42 m/45.0° | 0.11 m/45.0° | ||
0.42 m/45.0° | 0.42 m/45.0° |
Parameter | |||
---|---|---|---|
Parameter (NDFT/CS) | Monostatic SAR | SMS-TomoSAR | SMS-TomoSAR |
---|---|---|---|
Target height span (m) | |||
Rayleigh resolution (m) | |||
Imaging height error and phase | |||
Unambiguity height (m) | |||
PSLR (dB) | |||
ISLR (dB) |
Target | Complex Scattering Coefficient | Target nsr Height (m) |
---|---|---|
Target A | ||
Target B | ||
Target C complex scattering coefficient |
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Zhao, J.; Yu, A.; Zhang, Y.; Zhu, X.; Dong, Z. Spatial Baseline Optimization for Spaceborne Multistatic SAR Tomography Systems. Sensors 2019, 19, 2106. https://doi.org/10.3390/s19092106
Zhao J, Yu A, Zhang Y, Zhu X, Dong Z. Spatial Baseline Optimization for Spaceborne Multistatic SAR Tomography Systems. Sensors. 2019; 19(9):2106. https://doi.org/10.3390/s19092106
Chicago/Turabian StyleZhao, Jiuchao, Anxi Yu, Yongsheng Zhang, Xiaoxiang Zhu, and Zhen Dong. 2019. "Spatial Baseline Optimization for Spaceborne Multistatic SAR Tomography Systems" Sensors 19, no. 9: 2106. https://doi.org/10.3390/s19092106