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The proliferation of HF radar systems for ocean remote sensing and maritime surveillance continues apace, with hundreds of such radars now deployed around the world. The overwhelming majority of these radars operate in the conventional monostatic configuration, with the transmitting and receiving systems collocated or closely spaced; this simple geometry has obvious advantages in terms of cost, siting requirements, communications, maintenance, signal processing, and echo interpretation, and it has been adopted by HF radars exploiting line-of-sight, surface wave, and skywave propagation modalities. All these considerations notwithstanding, in some circumstances there can be compelling reasons to implement bistatic configurations, defined as geometries in which the separation between transmitter and receiver is comparable with the range to the zones being interrogated. Factors that can drive this decision include energy budget, desire to exploit hybrid propagation modes, scattering characteristics of the targets of interest, properties of the clutter, survivability, and covertness. This book, a compilation of papers by leading researchers in the field, offers a panoramic account of the state of the art in bistatic HF radar. Topics covered include system design, HF propagation and scattering, signal processing, echo interpretation, and applications in the maritime domain. Supported with extensive references to the literature, this book should serve as an essential source for practitioners keen to expand the capabilities of their HF radar systems.

bistatic HF radar --- radar cross section (RCS) --- sea clutter --- shore-to-air bistatic HF radar --- scattering coefficient --- Doppler spectra --- cyclic cross ambiguity function --- data fusion --- GPS --- multiple satellites collaboration --- passive detection --- HFSWR --- target tracking --- interacting multiple model --- extended Kalman filter --- track association --- extreme learning machine --- HF radar --- remote sensing --- inversion --- radar cross section --- bistatic radar --- directional wave spectrum --- bistatic HFSWR --- shipborne HFSWR --- first-order sea clutter --- experiment verification --- electromagnetic scattering --- radio oceanography --- OTH radar --- compact HFSWR --- bistatic configuration --- target detection

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The aim of this Printed Edition of Special Issue entitled "Recent Advancements in Radar Imaging and Sensing Technology” was to gather the latest research results in the area of modern radar technology using active and/or radar imaging sensing techniques in different applications, including both military use and a broad spectrum of civilian applications. As a result, the 19 papers that have been published highlighted a variety of topics related to modern radar imaging and microwave sensing technology. The sequence of articles included in the Printed Edition of Special Issue dealt with wide aspects of different applications of radar imaging and sensing technology in the area of topics including high-resolution radar imaging, novel Synthetic Apertura Radar (SAR) and Inverse SAR (ISAR) imaging techniques, passive radar imaging technology, modern civilian applications of using radar technology for sensing, multiply-input multiply-output (MIMO) SAR imaging, tomography imaging, among others.

microwave staring correlated imaging (MSCI) --- gain–phase errors --- strip --- self-calibration --- distributed MIMO radar --- target localization --- double-sided bistatic range (BR) --- microwave staring correlated imaging --- unsteady aerostat platform --- motion parameter fitting --- position error --- radar imaging --- synthetic aperture radar --- compressed sensing --- sparse reconstruction --- regularization --- passive forward scattering radar --- chirp rate estimation --- passive radar --- forward scattering radar --- radar measurements --- time-frequency analysis --- bistatic synthetic aperture radar (SAR) --- hyperbolic approximation --- phase compensation --- modified omega-K --- ground-penetrating radar --- noise suppression --- singular value decomposition --- Hankel matrix --- window length optimization --- synthetic aperture radar (SAR) --- high resolution wide swath (HRWS) --- azimuth multichannel reconstruction --- phase center adaptation --- false targets suppression --- damped exponential (DE) model --- inverse synthetic aperture radar (ISAR) --- radar signatures --- state–space approach (SSA) --- sparse representation --- polarimetric --- SAR tomography --- MIMO radar --- noise radar --- radar signal processing techniques --- analogue correlation --- modern radar applications --- delay line --- high pulse repetition frequency (HPRF) --- random frequency hopping (RFH) --- hypersonic aircraft --- SAR --- Synthetic Aperture Radar --- ASIFT --- Despeckling Filter --- Navigation --- Structure from Motion --- Iterative Closest Point --- radar tomography --- compressive sensing --- bistatic radar --- parameter-refined orthogonal matching pursuit (PROMP) --- orthogonal matching pursuit (OMP) --- k-space tomography --- narrowband radar --- off-grid compressive sensing --- slow-time k-space --- spatial frequency --- Doppler radar tomography --- k-space augmentation --- high-resolution narrowband radar --- multiband processing --- bandwidth stitching --- multi-scale representation learning (MSRL) --- pyramid pooling module (PPM) --- compact depth-wise separable convolution (CSeConv) --- convolution auto-encoder (CAE) --- object classification --- CARABAS II --- ground scene prediction --- image stack --- multi-pass --- SAR images --- moving targets --- inverse SAR (ISAR) --- motion compensation --- hybrid SAR/ISAR --- improved rank-one phase estimation (IROPE) --- Gaofen-3 (GF-3) --- assive radar --- time-frequency reassignment