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Direction of arrival (DOA) is an important parameter to be measured in pulse compression radar (PCR) systems. It is more favorable for DOA estimation to be done after pulse compression, because the targets have been separated in range domain and usually have higher SNR. But after pulse compression, only a single snapshot is available in each range cell. As a result, conventional DOA estimation methods...
A method for passive Detection, Characterization, and Localization (DCL) of multiple low power, Linear Frequency Modulated Continuous Wave (LFMCW) (i.e., Low Probability of Intercept (LPI)) signals is proposed. In contrast to other detection and characterization approaches, such as those based on the Wigner-Ville Transform (WVT) [1] or the Wigner-Ville Hough Transform (WVHT) [2], our approach does...
In his paper he authors propose an innovative two-sage approach for ship detection which is applied o synthetic aperture radar (SAR) images. This technique is based on he join use of a fast coarse Wavelebased detector and a Consant False Alarm Rae (CFAR) detector. Real SAR data acquired by the COSMO-SkyMed (CSK) system have been processed o verify he effectiveness of his proposed technique.
The paper presents a concept of using universal software radio peripheral (USRP) as a hardware platform for frequency modulation continuous wave (FMCW) synthetic aperture radar (SAR). The concept presented has been successfully verified through several measurements in the laboratory, as well as in real scenarios where the USRP-based SAR radar was mounted on a ground moving platform and SAR images...
The use of skywave over-the-horizon radar for the detection and tracking of ships is significantly more challenging than the equivalent task for aircraft. This is due in large part to multi-path and Doppler disturbed propagation through the ionosphere. In this paper we report initial results for a newly proposed class of radar called Mode-Selective OTHR that is able to selectively isolate each of...
In this paper, a two-stage image formation approach, which combines the Fourier and sparsity-based reconstruction strategies, is proposed to effectively process the multi-static synthetic aperture radar (SAR) data. This method exploits the block sparsity of the Fourier sampling patterns which contain a number of generally disjoint subbands in the two-dimensional spatial frequency domain. The Nyquist...
Most radar systems employ a feed-forward processing chain in which they first perform some low-level processing of received sensor data to obtain target detections and then pass the processed data on to some higher-level processor such as a tracker, which extracts information to achieve a system objective. System performance can be improved using adaptation between the information extracted from the...
The purpose of this paper is to present an experimental trial carried out at the Defence Academy of the United Kingdom to measure simultaneous multistatic and multimodal micro-Doppler signatures of various targets, including humans and flying UAVs. Signatures were gathered using a network of sensors consisting of a CW monostatic radar operating at 10 GHz (X-band) and an ultrasound radar with a monostatic...
We consider the problem of waveform design for Multiple-Input Multiple-Output (MIMO) radar in the presence of signal-dependent interference embedded in white Gaussian disturbance. We present two sequential optimization procedures to maximize the Signal to Interference plus Noise Ratio (SINR), accounting for a constant modulus constraint as well as a similarity constraint involving a known radar waveform...
A dual-band range-Doppler radar system, utilizing UHF and X-band, was developed to collect signatures of human and animal targets. To complement the dual-band radar suite, two video cameras were utilized to record simultaneous front and side view footage of the targets. The system was used to collect radar signatures of a variety of domesticated and wild animals engaged in various natural behaviors,...
In this paper, we propose a dynamic spectrum allocation approach for the coexistence of a radar system with a communications system whose operating frequency ranges overlap. We develop a combined mutual information criterion for the joint waveform and power spectrum design to optimize the performance of the radar and communications systems. The performance is evaluated in terms of the minimum separation...
The estimation of multicomponent radar signals with overlapped instantaneous frequencies (IFs) in low SNR environments has been a challenging research topic. This paper proposes an IF estimation algorithm for spectrally overlapped radar signals which contain continuous and stepped IF laws. Firstly, we design a gradient image via the time-frequency distribution, based on which two ratio images are...
This paper addresses the problem of dynamic clutter mitigation by focusing on the mitigation of the wind turbine clutter from the radar data. The basis pursuit and morphological component analysis approach are used to decompose the radar returns into the sum of oscillatory and transient components. The success of the morphological component analysis rely on sparsity, thus different transform domains...
A computation method for effective path of SAR double bounce scattering from trees and undulating terrain is presented. The large-scale elements of surface fitting are used to describe the variation of surface slope. The situation that there may be none or many effective paths of double bounce scattering from trees when the terrain is undulating with large-scale feature is fully considered through...
The distributed Kalman filter requires the measurement covariances of remote radar nodes to be known at all radar nodes. This is not possible for a radar network, as the true measurement covariances depend on the radar-target geometry and the fluctuating signal-to-noise ratio. This paper tackles this problem using the double debiased distributed Kalman filter (D3KF) which utilizes a radar model to...
Reliable micro-Doppler signature classification requires the use of robust features describing uniquely the micromotion. Moreover, future applications of micro-Doppler classification will require meaningful representation of the observed target by using a limited set of values. In this paper the application of the pseudo-Zernike moments for micro-Doppler classification is introduced demonstrating...
The trade-space of performance gain versus implementation cost is an important topic in transmit-adaptive radar processing. For signal design, one must be concerned with the signal-to-noise and interference ratio (SINR) gain, hardware needs for waveform synthesis (including bandwidth requirements, power constraints, etc.), and the shape of the ambiguity function when compared against a traditional...
This paper deals with coherent multi-polarization SAR change detection assuming the availability of reference and test images collected from N multiple polarimetric channels. At the design stage, the change detection problem is formulated as a binary hypothesis testing problem and the principle of invariance is used to come up with decision rules sharing the Constant False Alarm Rate (CFAR) property...
The presence of large wind turbine farms has been shown to significantly degrade radar tracking of aircraft. The loss in localized radar coverage could pose issues in airspace management, especially within Temporary Flight Restrictions (TFR) areas. As wind turbine development expands, there is an increasing potential that the degraded radar tracking surveillance could negatively impact safety operations...
In this paper, cross-correlation processing with interference mitigating ability is proposed for passive bistatic radar. Direct signal interference from an illuminator-of-opportunity and stationary clutter are simultaneously cancelled in frequency domain during FFT (Fast Fourier Transform)-based cross-correlation processing. Due to the frequency domain processing, the proposed method can extend to...
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