Principles of Modern Radar - Volume 2 1891121537

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7.7 Applications 329(a)FIGURE 7-60 Example RADARSAT-1 imagery (a) stripmap image of Atlanta, GA, andvicinity, and (b) expanded view of Atlanta’s Hartsfield-Jackson International Airport.(RADARSAT-1 Data c○ Canadian Space Agency/ Agence spatiale canadienne 1998.Received by the Canada Centre for Remote Sensing. Processed and distributed by MDAGeospatial Services Inc. All rights reserved.)(b)A common theme across these applications is the goal of surveying a large area;indeed, global coverage is sometimes desirable. The properties of an isolated 1 km by1 km spot on the earth are rarely of interest. Consequently, spotlight operation, with itslimited image extents and low area coverage rates, is quite unusual for remote sensing.On the other hand, moderate cross-range resolutions are required to segment and isolatedifferent terrain types and facilitate parameter retrieval as a function of location. Therefore,ScanSAR collections, with their associated poor cross-range resolutions, have limitedutility. Stripmap possesses a reasonable balance between cross-range resolution and ACR,making it the standard acquisition mode for remote sensing.The Canadian Space Agency’s RADARSAT-1 is a fine example of a space-based SARfor remote sensing applications [18,19]. The radar antenna can be steered electronicallyin elevation, providing a ScanSAR capability. However, the antenna is incapable of eitherelectronic or mechanical steering in azimuth, and continuous slewing of the platform isimpractical; therefore, the system does not possess a spotlight mode. Stripmap operationproduces the finest cross-range resolution, and RADARSAT is frequently tasked in thismode. Example imagery appears in Figure 7-60 [20].7.7.2 Penetration ApplicationsIt is sometimes desirable to produce imagery of objects through an intervening medium.Applications include the detection and characterization of ground vehicles hidden fromview underneath treetop canopies, detection and localization of buried landmines andsubterranean pipes, and the estimation of ground elevation beneath glacial ice sheets. Theintervening medium in these three cases is tree foliage, earth soil and rocks, and glacialice, respectively.
330 CHAPTER 7 Stripmap SARFIGURE 7-61Example P-3 FOPENSAR example of (a) astripmap image of aforested regionshowing roads andclearing with agreenhouse nearthe middle, and(b) expanded viewof the greenhouseclearing showingreflector calibrationtargets and twotarget vehicles undertree canopy foliage.(From Sheen et al.[23]. With permissionof the IEEE.)(a)PlantmonitorsGreenhouses(b)Reflector 1Reflector 2Truck 1Truck 2Medium penetration encourages the use of low frequencies and long wavelengths.The impact on SAR is twofold:• A antenna aperture size that produces a narrow beamwidth at high frequencies willhave a wide beamwidth at low, penetrating frequencies, a trend suggested by (7.113).• Wide integration angles are required to achieve fine cross-range resolutions at longwavelengths, as indicated by (7.2).These two observations were intertwined in [1] when we found that the stripmapintegration angle is limited to the antenna beamwidth. In short, low frequencies providelong wavelengths for penetration but also lead to wide antenna beamwidths, but thesesame wide beams yield reasonable stripmap cross-range resolutions.The ERIM/NAWC P-3 Ultra-Wideband SAR is a representative example of a FOPENimaging system [21,22]. Example imagery appears in Figure 7-61 [23]. Stripmap operationyields acceptable cross-range resolutions that are consistent with the down-rangeresolution provided by the operating bandwidth; further improvements to cross-rangeresolution through implementation of a spotlight mode are unnecessary. Indeed, thebeamwidth of the antenna system is already so wide that scanning the beam, in eithera ScanSAR or spotlight mode, would have a negligible impact on resolution and ACR.For these reasons, low frequency SAR system modes tend to be exclusively stripmap innature.7.8 SUMMARYStripmap SAR employs a linear collection geometry and a fixed antenna orientation, typicallyto broadside, that is, normal to the platform velocity vector. This mode of operationachieves the finest possible cross-range resolution while surveying the passing terrainwithout gaps in coverage.
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Principles of Modern Radar
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Published by SciTech Publishing, an
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Brief ContentsPreface xvPublisher A
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xContents3.6 Adaptive MIMO Radar 10
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xiiContents9.3 Adaptive Jammer Canc
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xivContents15.3 Multisensor Trackin
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xviPrefacehas always been the unlik
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Publisher AcknowledgmentsTechnical
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Editors and ContributorsVolume Edit
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xxiiEditors and ContributorsDr. Lis
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xxivEditors and ContributorsMr. Ara
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2 CHAPTER 1 Overview: Advanced Tech
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1.3 Radar and System Topologies 5FI
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1.4 Topics in Advanced Techniques 7
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1.6 References 15TABLE 1-1Summary o
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PART IWaveforms and SpectrumCHAPTER
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20 CHAPTER 2 Advanced Pulse Compres
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2.2 Stretch Processing 35is applied
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2.2 Stretch Processing 37TABLE 2-1
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2.5 Stepped Frequency Waveforms 61T
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2.5 Stepped Frequency Waveforms 63w
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2.5 Stepped Frequency Waveforms 69I
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2.9 References 812.7.4 SummaryWhile
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2.9 References 83[27] Taylor, Jr.,
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2.10 Problems 85shift across the pu
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88 CHAPTER 3 Optimal and Adaptive M
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3.2 Optimum MIMO Waveform Design fo
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3.4 Optimum MIMO Design for Target
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3.4 Optimum MIMO Design for Target
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3.5 Constrained Optimum MIMO Radar
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108 CHAPTER 3 Optimal and Adaptive
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3.6 Adaptive MIMO Radar 111SINR Los
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3.10 Problems 115[22] W. Y. Hsiang,
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3.10 Problems 1179. A constrained o
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120 CHAPTER 4 MIMO Radarperformance
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4.3 The MIMO Virtual Array 123separ
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4.4 MIMO Radar Signal Processing 12
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134 CHAPTER 4 MIMO RadarFIGURE 4-7T
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136 CHAPTER 4 MIMO Radar4.5.2 MIMO
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138 CHAPTER 4 MIMO Radarnamely, R
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140 CHAPTER 4 MIMO RadarTABLE 4-2 P
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142 CHAPTER 4 MIMO RadarSINR Loss (
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144 CHAPTER 4 MIMO Radar[10] H. V.
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Radar Applications of SparseReconst
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5.1 Introduction 149δ = M/N, the u
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152 CHAPTER 5 Radar Applications of
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5.2 CS Theory 163While the notion o
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5.2 CS Theory 165as , where is a b
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5.3 SR Algorithms 167than the norm
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5.3 SR Algorithms 169the value of o
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5.3 SR Algorithms 171takes special
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5.3 SR Algorithms 173The function f
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5.3 SR Algorithms 175of the TV norm
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5.3 SR Algorithms 177One can argue
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5.3 SR Algorithms 179probability ma
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5.3 SR Algorithms 181only a subset
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5.4 Sample Radar Applications 183pr
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5.4 Sample Radar Applications 185We
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5.4 Sample Radar Applications 187th
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5.4 Sample Radar Applications 189tu
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5.4 Sample Radar Applications 191Ra
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5.4 Sample Radar Applications 193Ta
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Spotlight SyntheticAperture RadarCH
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6.1 Introduction 213• Image quali
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6.2 Mathematical Background 215andf
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6.2 Mathematical Background 2172π
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220 CHAPTER 6 Spotlight Synthetic A
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6.4 Sampling Requirements and Resol
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6.4 Sampling Requirements and Resol
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6.5 Image Reconstruction 239FIGURE
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6.6 Image Metrics 241The contrast r
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6.6 Image Metrics 243Along-track am
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6.7 Phase Error Effects 245TABLE 6-
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260 CHAPTER 7 Stripmap SAR3 m SAR O
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262 CHAPTER 7 Stripmap SAR• RMA i
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264 CHAPTER 7 Stripmap SARH 0 (ω)
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268 CHAPTER 7 Stripmap SARTABLE 7-1
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274 CHAPTER 7 Stripmap SARFIGURE 7-
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276 CHAPTER 7 Stripmap SAR−500Sce
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Page 362 and 363: Interferometric SAR andCoherent Exp
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380 CHAPTER 8 Interferometric SAR a
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Adaptive Digital BeamformingCHAPTER
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9.1 Introduction 403c k = clutter s
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408 CHAPTER 9 Adaptive Digital Beam
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9.2 Digital Beamforming Fundamental
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9.3 Adaptive Jammer Cancellation 42
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9.5 Wideband Cancellation 447FIGURE
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454 CHAPTER 10 Clutter Suppression
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10.2 Space-Time Signal Representati
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10.5 STAP Fundamentals 4810−5−1
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10.6 STAP Processing Architectures
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10.7 Other Considerations 4911 CPIM
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10.9 Summary 49310.7.3 Computationa
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10.10 References 495[12] Fenner, D.
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10.11 Problems 497the PSD in Figure
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11.2 Colored Space-Time Exploration
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11.2 Colored Space-Time Exploration
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506 CHAPTER 11 Space-Time Coding fo
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11.8 References 525Cost reduction o
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11.9 Problems 52711.9.2 Equivalence
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530 CHAPTER 12 Electronic Protectio
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12.2 Electronic Attack 535TABLE 12-
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12.2 Electronic Attack 541variation
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12.5 Antenna-Based EP 557are adjust
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12.6 Transmitter-Based EP 561polari
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12.11 Summary 583TABLE 12-4Summary
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12.14 Problems 585[9] Stimson, G.W.
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Introduction to RadarPolarimetryCHA
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13.1 Introduction 591and precipitat
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13.1 Introduction 593S: target scat
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13.2 Polarization 597After substitu
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13.2 Polarization 599zFIGURE 13-4Po
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13.3 Scattering Matrix 601left-hand
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604 CHAPTER 13 Introduction to Rada
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13.4 Radar Applications of Polarime
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13.4 Radar Applications of Polarime
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13.5 Measurement of the Scattering
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13.5 Measurement of the Scattering
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13.8 References 623• Lee, Jong-Se
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13.8 References 625[32] Kraus, J.D.
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13.9 Problems 627with the result in
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Automatic Target RecognitionCHAPTER
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14.2 Unified Framework for ATR 633P
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14.3 Metrics and Performance Predic
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14.3 Metrics and Performance Predic
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14.4 Synthetic Aperture Radar 639TA
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14.4 Synthetic Aperture Radar 641Te
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14.4 Synthetic Aperture Radar 651th
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14.5 Inverse Synthetic Aperture Rad
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14.5 Inverse Synthetic Aperture Rad
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14.6 Passive Radar ATR 657radar sys
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14.7 High-Resolution Range Profiles
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14.9 Further Reading 661take a targ
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14.10 References 663[19] Q. H. Pham
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14.10 References 665[56] M. Martore
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14.10 References 667[92] E. Libby,
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Multitarget, MultisensorTrackingCHA
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15.1 Review Of Tracking Concepts 67
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15.1 Review Of Tracking Concepts 67
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678 CHAPTER 15 Multitarget, Multise
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15.2 Multitarget Tracking 683TABLE
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15.2 Multitarget Tracking 685remove
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15.5 Further Reading 69515.4 SUMMAR
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15.6 References 697[11] Blair, W.D.
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15.7 Problems 6992. Common metrics
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⎡⎤3 0 0 0 0 00 3 0 0 0 0P 2 =0
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Human Detection With Radar:Dismount
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environment that may mask the gener
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D s % = Boulic-Thalmann model param
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16.2 Characterizing the Human Radar
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714 CHAPTER 16 Human Detection With
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16.4 Technical Challenges in Human
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16.4 Technical Challenges in Human
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16.5 Exploiting Knowledge for Detec
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16.7 Further Reading 729enable not
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16.8 References 731[13] Broggi, A.,
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16.8 References 733[53] G.E. Smith,
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16.8 References 735Conference on So
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16.9 Problems 737FIGURE 16-13Pendul
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740 CHAPTER 17 Advanced Processing
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17.3 Direct Signal and Multipath/Cl
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17.4 Signal Processing Techniques f
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17.10 References 817[20] Chetty, K.
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17.11 Problems 819[52] Gao, Z., Tao
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17.11 Problems 8215. Using the sign
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824 Appendix A: Answers to Selected
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ResolutionResolution withDimension
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830 IndexASAR. See Advanced SAR (AS
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832 IndexCross-polarization (XPOL),
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834 IndexExciter-based EP (cont.)fr
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836 IndexInterferencecolored noise,
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838 IndexMoving target indication (
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840 IndexPOI. See Probability of in
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842 IndexSaturated (constant amplit
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844 IndexStripmap SAR (cont.)remote
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846 IndexWWald sequential test, com
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