Includes the top 50 most frequently accessed documents for this publication according to the usage statistics for the month of

• ### Communication-embedded OFDM chirp waveform for delay-Doppler radar

Publication Year: 2018, Page(s):353 - 360
| | PDF (3857 KB)

A fundamental problem in the fusion of wireless communications and radar is to design suitable waveforms that can be simultaneously used for information transmission and radar sensing. In this study, the authors extend the orthogonal frequency division multiplexing (OFDM) waveform by embedding communication codes to communication-embedded OFDM chirp waveforms for delay-Doppler radar applications. ... View full abstract»

• ### State-of-the-art technologies for UAV inspections

Publication Year: 2018, Page(s):151 - 164
| | PDF (5702 KB)

Visual condition inspections serve as the basis for determining the need and schedule for service tasks such as maintenance and remediation projects to preserve the proper functioning of power facilities and infrastructure. An increasing accumulation of service projects has recently surfaced due to the lengthy, labour-intensive and subjective qualities of the current method for inspection. These p... View full abstract»

• ### Development of frequency diverse array radar technology: a review

Publication Year: 2018, Page(s):165 - 175
| | PDF (3634 KB)

Electronic beam steering with greater efficiency is a vibrant feature of a phased array antenna, but for all the range cells, it is fixed at a specific angle. To mitigate this problem, frequency diverse array (FDA) antenna was proposed. This study presents a review on the development of FDA technology in radar and navigation applications. FDA is different from a conventional phased array antenna r... View full abstract»

• ### ISAR imaging and cross-range scaling of high-speed manoeuvring target with complex motion via compressive sensing

Publication Year: 2018, Page(s):301 - 311
| | PDF (3698 KB)

For targets with extreme manoeuvres, inverse synthetic aperture radar (ISAR) imaging suffers from translational motion (TM), which is modelled as a one-dimensional (1D) phase error, and non-uniform rotational motion (RM), which is a multidimensional (MD) phase error that causes severe blurring in ISAR images. Full-aperture data collection is often unachievable because of interference with other ra... View full abstract»

• ### Scalable indoor positioning system with multi-band FMCW

Publication Year: 2018, Page(s):46 - 55
| | PDF (4291 KB)

This study presents a multi-band scalable positioning system that not only provides accurate means of navigation but also seamlessly extends the maximum number of reference and mobile nodes. Time synchronisation is carried out wirelessly, hence minimising the required hardware to easily set up the system. Due to its high precision and immunity to radio frequency interferences, a multi-band frequen... View full abstract»

• ### Cooperative robotic networks for underwater surveillance: an overview

Publication Year: 2017, Page(s):1740 - 1761
| | PDF (4356 KB)

Underwater surveillance has traditionally been carried out by means of surface and undersea manned vessels equipped with advanced sensor systems. This approach is often costly and manpower intensive. Marine robotics is an emerging technological area that enables the development of advanced networks for underwater surveillance applications. In contrast with the use of standard assets, these advance... View full abstract»

• ### Automatic antenna scan type classification for next-generation electronic warfare receivers

Publication Year: 2018, Page(s):466 - 474
| | PDF (3994 KB)

Cognitive electronic warfare (EW) is the key feature for next-generation EW systems. The deinterleaving and classification of received radar pulses and selection of the proper electronic attack technique are the common issues for non-preprogrammed cognitive jamming systems. Antenna scan type (AST) is a dominant parameter to discriminate and solve the ambiguities for the classification of the radar... View full abstract»

• ### Range–Doppler reconstruction for frequency agile and PRF-jittering radar

Publication Year: 2018, Page(s):348 - 352
| | PDF (2971 KB)

Agility radar with the carrier frequency random hopping and the pulse repetition frequency (PRF) staggering from pulse to pulse achieves superior performance against the electromagnetic jamming. This novel scheme leads to the discontinuity of phase in a coherent processing interval, thus the fast Fourier transform-based method is no longer a valid way to estimate the velocity of a target. A novel ... View full abstract»

• ### Modulation classification method for frequency modulation signals based on the time–frequency distribution and CNN

Publication Year: 2018, Page(s):244 - 249
| | PDF (3318 KB)

Signal modulation classification is an important research subject in both military and civilian field. This study proposed a novel blind modulation classification method based on the time-frequency distribution and convolutional neural network (CNN). This is the first attempt to treat the time-frequency map as a picture and use an outstanding (CNN-based) algorithm in computer vision area for signa... View full abstract»

• ### Three-dimensional SAR imaging of sea targets with low PRF sampling

Publication Year: 2018, Page(s):294 - 300
| | PDF (3256 KB)

Three-dimensional (3D) synthetic aperture radar (SAR) image formation provides the scene reflectivity estimation along azimuth, range, and elevation coordinates. A common 3D SAR focusing approach is compressed sensing (CS)-based SAR tomography, but this technique brings image quality problems because of the undesired side-lobes in the focused two-dimensional (2D) images. Moreover, the amount of ra... View full abstract»

• ### Micro-Doppler effect removal for ISAR imaging based on bivariate variational mode decomposition

Publication Year: 2018, Page(s):74 - 81
| | PDF (2972 KB)

Micro-Doppler (m-D) effect is caused by vibrations and/or rotations of mechanical components of moving targets. The m-D signatures corresponding to such micro-motions (m-Ms) may significantly degrade the usefulness of synthetic aperture radar/inverse synthetic aperture radar (ISAR) imagery. The strong echo of the main body of a target can make the m-D parameter estimation of the vibrating or rotat... View full abstract»

• ### Range jamming suppression with a coupled sequential estimation algorithm

Publication Year: 2018, Page(s):341 - 347
| | PDF (5328 KB)

This study deals with the target detection problem embedded in multiple range jamming which is usually employed to mask the useful signal or deceive the radar systems. Exploiting the observation that the waveform of the range jamming would be not identical to the probing signal of the radar system, the authors propose a coupled sequential estimation algorithm to obtain simultaneously the range pro... View full abstract»

• ### Classification of micro-Doppler signatures of human motions using log-Gabor filters

Publication Year: 2015, Page(s):1188 - 1195
Cited by:  Papers (4)
| | PDF (716 KB)

In recent years, Doppler radar has been used as a sensing modality for human gait recognition, due to its ability to operate in adverse weather and penetrate opaque obstacles. Doppler radar captures not only the speed of the target, but also the micro-motions of its moving parts. These micro-motions induce frequency modulations that can be used to characterise the target movements. However, a majo... View full abstract»

Publication Year: 2017, Page(s):116 - 124
| | PDF (5943 KB)

This study presents the use of micro-Doppler signatures collected by a multistatic radar to detect and discriminate between micro-drones hovering and flying while carrying different payloads, which may be an indication of unusual or potentially hostile activities. Different features have been extracted and tested, namely features related to the radar cross-section of the micro-drones, as well as t... View full abstract»

• ### Review of micro-Doppler signatures

Publication Year: 2015, Page(s):1140 - 1146
Cited by:  Papers (12)
| | PDF (302 KB)

Micro-Doppler signals refer to Doppler scattering returns produced by the motions of the target other than gross translation. The small micro-motions of a subject, and even just parts of a subject, can be observed through the micro-Doppler signature it creates in response to an active emitter such as a radar, laser, and even acoustic emitters. These micro-Doppler signatures are produced by the kin... View full abstract»

• ### Analysis of radar micro-Doppler signatures from experimental helicopter and human data

Publication Year: 2007, Page(s):289 - 299
Cited by:  Papers (106)
| | PDF (1387 KB)

This paper highlights the extraction of micro-Doppler (m-D) features from radar signal returns of helicopter and human targets using the wavelet transform method incorporated with time-frequency analysis. In order for the extraction of m-D features to be realised, the time domain radar signal is decomposed into a set of components that are represented at different wavelet scales. The components ar... View full abstract»

• ### Adaptive beamforming algorithms with robustness against steering vector mismatch of signals

Publication Year: 2017, Page(s):1831 - 1838
| | PDF (5015 KB)

Three novel adaptive beamforming algorithms are developed to mitigate the steering vector (SV) random errors of both the desired signal and interferences. With the use of iterative robust Capon beamforming technique, each interference's SV is estimated first, and then the interference-plus-noise covariance matrix is reconstructed according to its definition. To accurately estimate the signal of in... View full abstract»

• ### Overview of frequency diverse array in radar and navigation applications

Publication Year: 2016, Page(s):1001 - 1012
Cited by:  Papers (15)
| | PDF (828 KB)

Different from phased array providing only angle-dependent transmit beampattern, frequency diverse array (FDA) employs a small frequency increment across its array elements to provide range–angle-dependent transmit beampattern. This enables the array beam to scan without the need of phase shifters or mechanical steering. Since FDA has received much attention in antenna and radar signal proc... View full abstract»

• ### Multitarget tracking performance metric: deficiency aware subpattern assignment

Publication Year: 2018, Page(s):373 - 381
| | PDF (1768 KB)

Multitarget tracking is a sequential estimation problem where conditioned on noisy sensor measurements, state variables of several targets need to be estimated recursively. In this study, the authors propose a novel performance measure for multitarget tracking named as Deficiency Aware Subpattern Assignment (DASA), that can be used to consistently compare algorithms in a broad spectrum of formulat... View full abstract»

• ### Improved target direction-of-arrival estimation using multiple adjacent beams for airborne phased array scanning radar

Publication Year: 2018, Page(s):239 - 243
| | PDF (1623 KB)

In order to avoid straddling loss, airborne phased array scanning radar transmits beams with small step angle, and then the same target can be detected again and again in multiple adjacent beams through azimuth scanning. Therefore, considering its long-range surveillance and high revisit rate, the authors may assume that the azimuth angle of the same target almost keeps unchanged during multiple b... View full abstract»

• ### Target detection for a kind of troposcatter over-the-horizon passive radar based on channel fading information

Publication Year: 2018, Page(s):407 - 416
| | PDF (5176 KB)

The troposcatter over-the-horizon (OTH) passive radar plays an important role in the beyond-line-of-sight surveillance, for its high propagation reliability and low probability of interception. However, it has two major limitations, namely, large propagation losses and multipath scattering fading. Since the captured signals are non-stationary with low signal-to-noise ratio, high antenna gain is in... View full abstract»

• ### Human–vehicle classification using feature-based SVM in 77-GHz automotive FMCW radar

Publication Year: 2017, Page(s):1589 - 1596
| | PDF (2100 KB)

In this study, a human-vehicle classification using a feature-based support vector machine (SVM) in a 77-GHz automotive frequency modulated continuous wave (FMCW) radar system is proposed. As a classification criterion, the authors use a newly defined parameter called root radar cross section which reflects the reflection characteristics of targets. Based on this parameter, three distinctive signa... View full abstract»

• ### Low complexity sparse Bayesian estimation for UWB radar imaging

Publication Year: 2018, Page(s):268 - 275
| | PDF (3269 KB)

Ultra-wideband (UWB) radar imaging can provide high-resolution images of obscured objects using radio-frequency signals. Due to its vast applications, UWB radar imaging received considerable attention in the past decade. Compressive sensing (CS) has been used as a viable solution for the larger data required by radar imaging. The advances of CS-based UWB-radar imaging is burdened by the complexity... View full abstract»

• ### Joint registration and multi-target tracking based on labelled random finite set and expectation maximisation

Publication Year: 2018, Page(s):312 - 322
| | PDF (5286 KB)

A new analytical algorithm is developed to address the problem of joint sensor registration and multi-target tracking with varying target number and observation uncertainty based on the labelled random finite set (RFS) and expectation maximisation (EM). A new complete data log-likelihood function is derived with the measurement and state RFS variables, and the EM approach is employed to jointly es... View full abstract»

• ### Classification of human motions using empirical mode decomposition of human micro-Doppler signatures

Publication Year: 2014, Page(s):425 - 434
Cited by:  Papers (34)
| | PDF (1051 KB)

The ability to identify human movements can serve as an important tool in many different applications such as surveillance, military combat situations, search and rescue operations and patient monitoring in hospitals. This information can provide soldiers, security personnel and search and rescue workers with critical knowledge that can be used to potentially save lives and/or avoid dangerous situ... View full abstract»

• ### Multi-radar anti-bias track association based on the reference topology feature

Publication Year: 2018, Page(s):366 - 372
| | PDF (2008 KB)

To address track association problem for more than two radars under the influence of measurement biases, multi-radar anti-bias track association algorithm based on the reference topology feature (RET) is proposed. Influence of radar measurement biases and random errors on the RET is analysed and application conditions of track association algorithm based on the RET are clarified. The distance amon... View full abstract»

• ### Algebraic solution for three-dimensional TDOA/AOA localisation in multiple-input–multiple-output passive radar

Publication Year: 2018, Page(s):21 - 29
| | PDF (3322 KB)

The problem of estimating the location of a single target from time difference of arrival (TDOA) and angle of arrival (AOA) measurements using multi-transmitter multi-receiver passive radar system with widely separated antennas is discussed. A closed-form two-step target position estimator is presented and analysed. Using the measured AOAs, the method is able to resolve the weakness of the TDOA-ba... View full abstract»

• ### Two-stage DOA estimation method for low SNR signals in automotive radars

Publication Year: 2017, Page(s):1613 - 1619
| | PDF (2190 KB)

In this study, the authors propose an effective two-stage direction-of-arrival (DOA) estimation method for low signal-to-noise (SNR) signals in automotive radar systems. When antenna elements in the array receive low SNR signals, the performance of subspace-based DOA estimation algorithms is degraded. Concerning this case, they propose an enhanced DOA estimation method that offers better angular r... View full abstract»

• ### ISAR geometry, signal model, and image processing algorithms

Publication Year: 2017, Page(s):1425 - 1434
| | PDF (1706 KB)

Inverse synthetic aperture radar (ISAR) technique provides high-resolution images of observed moving objects. However, shadow-occluded effects and noise, which results in lack of fractions of the object geometry, often corrupt ISAR images. To facilitate the image analysis and to solve the target identification problem in most practical applications additional image-processing procedures are strong... View full abstract»

• ### Study on performance of bistatic circular synthetic aperture radar imaging using geometric diversity

Publication Year: 2018, Page(s):458 - 465
| | PDF (3320 KB)

Bistatic circular synthetic aperture radar (BCSAR) can realise super-resolution imaging of the complex scenario and eliminate sheltering of the straight line wave propagation. However, BCSAR encounters the ring effect and high sidelobe problem due to the discontinuity of Fourier sampling space induced by the limited signal bandwidth, which causes severe performance degradation in the final image. ... View full abstract»

• ### Polarimetric detection and range estimation for a point-like target in non-Gaussian clutter

Publication Year: 2018, Page(s):361 - 365
| | PDF (2191 KB)

In this study, a method is presented to deal with the problem of polarimetric detection of a point-like target with energy spillover in non-Gaussian clutter. Consecutive range samples are employed to enhance the detection and range estimation performances. Within the framework of the generalised likelihood ratio test, the decision statistic of the proposed polarimetric detector involves the textur... View full abstract»

• ### Cognitive FDA-MIMO radar for LPI transmit beamforming

Publication Year: 2017, Page(s):1574 - 1580
| | PDF (2167 KB)

Active radar is vulnerable to illegal eavesdroppers due to its high-gain beam-scanning signals. To reduce active radar visibility and enhance its low probability of intercept (LPI) capability, this study proposes a cognitive LPI transmit beamforming scheme using frequency diverse array (FDA) and multiple-input multiple-output (MIMO) hybrid array antenna. The achievement of LPI is due to the unique... View full abstract»

• ### High-resolution ISAR imaging based on two-dimensional group sparse recovery

Publication Year: 2018, Page(s):82 - 86
| | PDF (1672 KB)

Owing to the sparsity of the space distribution of point scatterers, compressed sensing (CS) method is successfully applied in inverse synthetic aperture radar (ISAR) imaging. However, in addition to sparsity, ISAR images usually exhibit group sparse structure. Here, the authors propose a novel two-dimensional (2D) group primal dual active set with continuation (2DGPDASC) algorithm to recover an I... View full abstract»

• ### ICA-based phase-comparison monopulse technique for accurate angle estimation of multiple targets

Publication Year: 2018, Page(s):323 - 331
| | PDF (3231 KB)

When multiple targets are located in the same antenna beam, angle measurements using monopulse technique are degraded due to mutual interference caused by overlap among the signals from multiple targets, even though the targets are measured as individual targets by the radar. If multiple targets are closely spaced within a few resolution cells, their mutual interference becomes significant, result... View full abstract»

• ### Distributed multiple-input–multiple-output radar waveform and mismatched filter design with expanded mainlobe

Publication Year: 2018, Page(s):227 - 238
| | PDF (7951 KB)

Distributed multiple-input-multiple-output radar usually needs to transmit nearly orthogonal waveforms, but the constant-modulus requirement from engineering applications often makes sidelobe levels difficult to suppress. In this study, the authors resort to two approaches to further suppress the sidelobe levels, i.e. orthogonal phase-coded waveforms with expanded mainlobe (OPCWEM) and its mismatc... View full abstract»

• ### Contribution of auxiliary coherent radar receiver to target's velocity estimation

Publication Year: 2018, Page(s):287 - 293
| | PDF (3937 KB)

Recent progress in bistatic radar techniques can be used to improve performances of classical monostatic radar. A prominent limitation of coherent radar is its inability to measure the complete velocity vector (magnitude and direction) of a detected target. A single coherent detection can provide range-rate only. At least two detections, separated in time, are needed to estimate the target's veloc... View full abstract»

• ### Joint optimisation of transmit waveform and receive filter for cognitive radar

Publication Year: 2018, Page(s):11 - 20
| | PDF (4972 KB)

In this study, the authors consider the problem of joint transmit waveform and receive filter design for cognitive radar. The problem is analysed in signal-dependent interference, as well as additive channel noise for an extended target with unknown target impulse response (TIR). To address this problem, an iterative algorithm is employed for target detection by maximising the average signal-to-in... View full abstract»

• ### Joint delay–Doppler estimation for passive bistatic radar with direct-path interference using MCMC method

Publication Year: 2018, Page(s):130 - 136
| | PDF (2950 KB)

This study deals with the problem of joint delay-Doppler estimation in a practically motivated scenario of passive bistatic radar, where the surveillance channel is polluted by the direct-path signal residual. A new joint delay-Doppler maximum-likelihood estimator (MLE) based on Markov chain Monte Carlo (MCMC) is proposed. The MCMC method allows one to compute the MLE in a computationally efficien... View full abstract»

• ### Deinterleaving of radar signals and PRF identification algorithms

Publication Year: 2007, Page(s):340 - 347
Cited by:  Papers (9)  |  Patents (1)
| | PDF (547 KB)

Electronic warfare (EW) receivers are passive receivers which receive emissions from other platforms, and do certain analysis on these emissions. Some EW receivers receive radar pulses, measure the parameter of each pulse received and group the pulses that belongs to the same emitter together to determine the radar parameters for each emitter. These parameters are then compared with values stored ... View full abstract»

• ### High-precision estimation of target range, radial velocity, and azimuth in mechanical scanning LFMCW radar

Publication Year: 2017, Page(s):1664 - 1672
| | PDF (2723 KB)

This study investigates the effects of antenna rotation on range, radial velocity, and azimuth estimation during coherent integration in linear frequency-modulated continuous wave (LFMCW) radars. When antenna scans during the coherent integration time, theoretical analysis indicates that the angle sensing with the traditional sum-difference amplitude-comparison (SDAC) monopulse method and the rang... View full abstract»

• ### Blind adaptive channel mismatch equalisation method for GNSS antenna arrays

Publication Year: 2018, Page(s):383 - 389
| | PDF (1913 KB)

A blind adaptive channel mismatch equalisation method for global navigation satellite system (GNSS) antenna arrays is proposed. The anti-jamming performance of the antenna arrays is limited by the channel mismatch that is a relative characteristic of each radio frequency channel but not an absolute non-ideal characteristic. To pre-process the received data in the frequency domain, the least mean s... View full abstract»

• ### Adaptive particle filter based on Kullback–Leibler distance for underwater terrain aided navigation with multi-beam sonar

Publication Year: 2018, Page(s):433 - 441
| | PDF (4055 KB)

Terrain aided navigation (TAN) is a promising approach to bound accumulated errors inherent to inertial navigation system by comparing terrain measurement with a reference map. Due to the non-linear nature of terrain, particle filters (PFs) are extensively studied for TAN because of its strong capability of dealing with non-linear problems. So far, most existing PFs for TAN manually select a fixed... View full abstract»

• ### Mismatched filter for transmit waveform with frequency notches

Publication Year: 2018, Page(s):332 - 340
| | PDF (2715 KB)

In order to reduce radar interference on communication systems within shared bands, the radar transmit waveform forms frequency notches in the shared bands. However, because of the notches, the auto-correlation of the transmit waveform with frequency notches leads to high-range sidelobes. In order to achieve low-range sidelobes, the authors propose a mismatched filter. The mismatched filter for th... View full abstract»

• ### Fast algorithm for sparse signal reconstruction based on off-grid model

Publication Year: 2018, Page(s):390 - 397
| | PDF (2019 KB)

In traditional compressed sensing theory, the authors have to adopt a discretisation procedure to reduce the continuous parameter space to a finite set of grid points. The discretisation procedure will cause the off-grid effect, which result in the reconstruction result unstable. To solve this problem, an alternating iteration algorithm is proposed which is built on the greedy-like algorithms. Fir... View full abstract»

• ### Radar high-resolution range profile feature extraction method based on multiple kernel projection subspace fusion

Publication Year: 2018, Page(s):417 - 425
| | PDF (3263 KB)

For radar automatic target recognition, the features should be extracted with sufficient target information, high discrimination, noise robustness and low feature vector dimension. In this study, a novel method for HRRP feature extraction is proposed, named as multiple kernel projection subspace fusion (MKPSF) method. For MKPSF, the statistical characteristics of both strong and weak scattering ra... View full abstract»

• ### Parameter estimation of CGIG clutter plus noise using constrained NIOME and MLE approaches

Publication Year: 2018, Page(s):176 - 185
| | PDF (4755 KB)

Compound Gaussian inverse Gaussian (CGIG) distribution with thermal noise is well suited for sea clutter. The compact expression of higher order moments estimator (HOME) for CGIG clutter plus noise parameters is derived. When non-integer order moments (NIOM) are considered, numerical integration based on Legendre' and Laguerre' polynomials of Gauss quadrature method is employed. This estimator i... View full abstract»

• ### Phase-sensitive FMCW radar system for high-precision Antarctic ice shelf profile monitoring

Publication Year: 2014, Page(s):776 - 786
Cited by:  Papers (5)
| | PDF (870 KB)

Ice shelves fringe much of the Antarctic continent, and, despite being up to 2 km thick, are vulnerable to climate change. Owing to their role in helping to control the ice sheet contribution to sea level change there is great interest in measuring the rate at which they are melting into the ocean. This study describes the development and deployment of an ice-penetrating phase-sensitive FMCW radar... View full abstract»

• ### Efficient implementation of the ML estimator for high-resolution angle estimation in an unmanned ground vehicle

Publication Year: 2018, Page(s):145 - 150
| | PDF (3060 KB)

Using a maximum-likelihood (ML) estimator for high-resolution angle estimation is well-suited for automotive radars. It is superior to other estimators in cases of small antenna aperture, small samples, and correlated signals. However, the computing power it requires prevents its widespread implementation. In this study, the authors propose a novel implementation method of the ML estimator that ac... View full abstract»

• ### Data association for target tracking rooted in maximum-likelihood values

Publication Year: 2018, Page(s):195 - 201
| | PDF (2522 KB)

A modified version of the probabilistic data association (PDA) is proposed for target tracking under measurement uncertainty conditions. This method uses the likelihood of each validated measurement, and selects the best k candidates to be integrated with the PDA. Different computer simulations with a single target under dense-cluttered environment are presented. Comparison to the standard ... View full abstract»

• ### Radar emitter classification for large data set based on weighted-xgboost

Publication Year: 2017, Page(s):1203 - 1207
| | PDF (2454 KB)

Radar emitter classification (REC) is very important in both civil and military fields. It becomes more and more difficult to classify the intercepted radar signals with the increasing complexity of radar signals. An efficient classification method using weighted-xgboost (w-xgboost) model for the complex radar signals is proposed in this study. The xgboost method is widely used by data scientists ... View full abstract»