1 Nonlinear Range Cell Migration Nonlinear Range Cell Migration (RCM) Compensation Method for (RCM) Compensation Method for Spaceborne/Airborne Forward-Looking Spaceborne/Airborne Forward-Looking Bistatic SAR Bistatic SAR Zhe Liu Zhe Liu , , Jianyu Yang, Xiaoling Zhang Jianyu Yang, Xiaoling Zhang School of Electronic Engineering, University of School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, Electronic Science and Technology of China, Chengdu, 611731, China 611731, China Presentation by Presentation by Zhe Liu Zhe Liu
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1 Nonlinear Range Cell Migration (RCM) Compensation Method for Spaceborne/Airborne Forward-Looking Bistatic SAR Nonlinear Range Cell Migration (RCM) Compensation.
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Nonlinear Range Cell Migration (RCM) Nonlinear Range Cell Migration (RCM)
Compensation Method for Spaceborne/Airborne Compensation Method for Spaceborne/Airborne
Forward-Looking Bistatic SARForward-Looking Bistatic SAR
Zhe Liu Zhe Liu ,, Jianyu Yang, Xiaoling Zhang Jianyu Yang, Xiaoling Zhang
School of Electronic Engineering, University of Electronic Science and School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, ChinaTechnology of China, Chengdu, 611731, China
Presentation byPresentation by Zhe LiuZhe Liu
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OutlineOutline
Introduction to the SA-FBSAR and its nonlinear RMC
Nonlinear RCM compensation method
Simulation results
Conclusions and further work
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IntroductionIntroduction -- What is SA-FBSARWhat is SA-FBSAR
Spaceborne/Airborne Forward-Looking Bistatic SAR (SA-FBSAR)
Platforms: Transmitter and receiver of SA-FBSAR are low earth orbit (LEO) satellite and aircraft, respectively.
Working Modes: Transmitter antenna works in side-looking or squint-looking mode; receiver antenna in forward-looking mode.
Target imaging scene: Target scene is along the receiver’s forward-looking direction
transmitter
receiver
Imaging scene
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IntroductionIntroduction -- Emergence of SA-FBSAREmergence of SA-FBSAR
Monostatic Monostatic SARSAR
Bistatic/Bistatic/MultistaticMultistatic
SAR(B/M SAR)SAR(B/M SAR)
Spaceborne Spaceborne B/M SARB/M SAR
AirborneAirborneB/M SARB/M SAR
S-A B/MS-A B/MSARSAR
Commu.Commu.satellitesatellite
BroadcastBroadcastsatellitesatellite
RadarRadarsatellitesatellite
• Diversity of target information
• High immunity to attacks
• Low cost
• Wide coverage, high SNR
• Platform flexibility
• Power saving
• wide band
• repeated observation
SA-BSAR SA-BSAR with radarwith radarsatellitesatellite
SA-FBSAR SA-FBSAR • attractive potential for
aircraft landing and navigation
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IntroductionIntroduction -- Emergence of SA-FBSAREmergence of SA-FBSAR
In Nov. 2009, FGAN (German Aerospace Center) launched the first experiment to test the feasibility of SA-FBSAR.
Fig.1 Imaging result of the first SA-FBSAR feasibility experiment in 2009
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IntroductionIntroduction -- Challenges of SA-FBSAR imagingChallenges of SA-FBSAR imaging
(a) Contour of ideal resolution cell’s area (unit: m2)
(b) target located at (500,100)
(c) target located at (0,0)
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SimulationSimulation
From the above simulation results, we could find that: Uncompensated RCM could deteriorate imaging result severely, cause nonlinear distortion
RCM compensation method designed for other FBSAR system could not compensate the nonlinear RCM, thus could not be applied to SA-FBSAR.
The proposed RCM compensation method could effectively compensate the nonlinear RCM in SA-FBSAR, and all targets are arranged in their originally correct positions.
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Conclusions & Further workConclusions & Further work RCM in SA-FBSAR not only depends on the target’s two-dimensional space location, but also varies with its range location nonlinearly. If not properly corrected, RCM would cause nonlinear distortion in the image and greatly degrade the imaging quality. We propose a two-dimensional nonlinear RCMC method for SA-FBSAR. The validity of the proposed method is verified.
Further improvement on resolution performance is under research