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In this paper, we address the problem of node clustering for compressed sensing (CS) based data collection in wireless sensor networks (WSNs). With consideration of recovery accuracy, communication cost and residual energy, two clustering strategies are proposed. Both strategies utilize Lapacian eigenvectors corresponding to the topology graph as a sparsifying basis, termed eigenbasis. The first clustering...
For energy-based multi-source localization in wireless sensor networks (WSNs), multi-resolution search and expectation maximization algorithms are of either high energy consumption or low localization accuracy. In this paper, we propose a multi-source localization algorithm via sparse reconstruction based on fully distributed structure (MLSR-FD) in WSNs. The fully distributed structure is used to...
We consider a joint scheme of antenna subset selection (ASS) and optimal power allocation (OPA) for localization inmultiple-input multiple-output (MIMO) radar sensors networks. The sensor management is accomplished by solving a constrained optimization problem that is formulated to minimize the error in estimating target position, while conserving transmitter number and power budget. We propose a...
In this paper, a power-oriented sink node placement strategy with one-hop topology for wireless body area networks (WBANs) is proposed. With lower power consumption as constraint condition, the optimal position of the sink node is selected. As a result, the network topologies are designed. The measurement results confirmed the proposed strategy by two specific application scenarios.
This paper focuses on small target of sea surface detection in sea clutter. Firstly, it analyses the statistic of sea clutter. Secondly, three feature vectors (namely, RAA, RPH and RVE) are extracted, which is utilized to discriminate the sea clutter and targets, and then the time-Doppler curve is used to distinguish the multi-targets in order to finish the small target of sea surface detection. Finally,...
This paper focuses on the target detection in low-grazing angle using Multiple-input Multiple-output (MIMO) radar systems with widely separated antennas in compound-Gaussian clutter, where the multipath effects are very abundant. The performance of detection can be improved via utilizing the multipath echoes. First, the reflection coefficient considering the curved earth effect is derived. Then, the...
The compressive sensing (CS) has been successfully used in inverse synthetic aperture radar (ISAR) imaging. Since the sparse reconstruction based on l1 norm is sensitive to the regularized factor and makes it inconvenient to be used in practice, the sparse Bayesian learning (SBL) is considered in this situation, which retains a preferable property of the l0 norm and has no user parameter. In this...
The ionospheric total electron content (TEC) is an important ionospheric parameters, Research of it has important significance on communication, radar, spaceflight, GNSS and other domains. Traditional short-term forecast model of ionospheric TEC uses single model so as to affects the prediction precision. A combination model based on seasonal model and ARMA model was put forward to overcome the shortages...
Radar target constant false alarm rate (CFAR) detection in wavelet domain is elementarily investigated in this paper. Theoretical analysis shows that independent and identically distributed Gaussian noise keeps the independence and variance invariable through the orthogonal wavelet transform. In the proposed detector, orthogonal wavelet transform is applied to radar echo signal and the wavelet coefficients...
Foreign Object Debris (FOD) on airport runway is one of the greatest threats to aviation safety. The major characteristics of FOD are diversity and smallness. Synthetic aperture radar (SAR) has a natural advantage in high resolution imaging, and is, therefore, very suitable for small and weak targets imaging on airport runway. Firstly, a new millimeter-wave FOD imaging system called Spotlight Circular...
The instability of helicopter flight brings motion errors in the conventional synthetic aperture radar (SAR) imaging. Combined with terahertz (THz) technology, the influence of range migration and low frequency motion error can be significantly reduced. However, it leads the system to be extremely sensitive to platform vibration, which causes paired echoes and deteriorates image quality. A method...
In this paper, the problem of target detection in the clutter plus Gaussian noise background is considered. The published detectors group the clutter and the noise as a single parameter; differently, we deal separately with the clutter and the noise. In the paper, the noise is assumed to be obtained in advance and the clutter is distributed according to a certain distribution. An adaptive target detector...
As increasing of small space objects in low earth orbit, more and more three-dimensional radars are adopted for space surveillance. In the form of radial velocity and radial acceleration, Doppler characteristics of LEO space object which are essential for small object detection are studied. Based on orbit inclination and object position, a new algorithm to estimate Doppler characteristics is proposed...
Waveform set with low-range sidelobes plays an important role in multiple-input and multiple-output (MIMO) radar. In this paper, the linear frequency modulation and phase-coded (LFM-PC) waveform including its properties is analytically presented. Furthermore, a Frank code set with zero sidelobe zones is proposed in the pursuit of low peak sidelobes, while the processing method is proposed to compress...
In order to solve the problems of detecting and tracking human face in multiple-view and under complicated background by using camera in real-time, this paper puts forward a new way that combines the multi-view face detection algorithm and face tracking algorithm to control a rotatable camera. The built-in system is able to track a human face through a camera, in which AdaBoost algorithm and Continuously...
The Smart Home is based on the Wireless Sensor Network (WSN) and Embedded System (ES). The most important parts of the Smart Home are low-power and high-security. And it is very vulnerable to various attacks ether an active or passive one in WSN. We shed light upon some existing security flaws in W2 and ZigBee. Some are quite useful to defend the various attacks, but don't suit for the Smart Home...
The proposed routing protocol BQAODV considers link stability, available bandwidth estimation, direction conformity and delay constraint based on AVAODV routing protocol. It selects a highest link stability route which meets available bandwidth, direction conformity and delay constraint during the search for a new route. The simulation results show that BQAODV's data packet loss rate and average end-to-end...
The broadcast nature of wireless communication makes it vulnerable to Eavesdropping. To enhance the communication security, cooperative jamming (CJ) is applied and studied in many previous works. However, jamming signal may also decrease the signal-to noise ratio (SNR) of legal receivers, and degrade the overall performance of networks. Therefore, the jammer power must be reasonably controlled. In...
Low-Density Parity-Check (LDPC) codes with linear time encoding complexity and low hardware storage are a hot issue recently. We propose a general method for constructing LDPC codes with quasi-cyclic (QC) structure and improved zigzag pattern to obtain both linear time encoding and low hardware storage. We call it irregular repeat accumulate like (IRA-like) codes for its similarity with irregular...
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