Abstract Introduction: Pulmonary function tests (PFTs) are the gold standard for diagnosing of Chronic obstructive pulmonary disease (COPD). Given its limitation in some scenarios, it is imperative to develop new high-throughput screening methods biomarkers COPD. This study aims explore feasibility novel diagnostic based on salivary metabolomics limited availability PFTs and difficulties implementation at primary care facilities.

Methods: Participants were recruited from...

This article aims to the joint design of transmit waveform and receive filter enhance clutter suppression capability for airborne radar with nonuniform pulse repetition interval (NUPRI). Specifically, a multipulse echo model NUPRI incorporating moving point-like target signal-dependent is first established. Then 2-D range-Doppler plane acquired by performing compression windowed Doppler processing on echo. Further, signal interference plus noise ratio (SINR) interested area in formulated as...

This correspondence deals with the joint design of transmit waveform and receive filter to achieve low range sidelobe level. The <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\mathscr{l}_{p}$</tex-math></inline-formula> norm matching error correlation function template mainlobe broadening is considered as a figure merit minimize. To ensure hardware compatibility loss-in-processing gain, peak-average-power...

This paper deals with the coherent radar detection non-uniform pulse repetition intervals (PRI), which has strong electronic counter-countermeasures capabilities to enemy jammer thanks its low interception and difficult sort. A novel processing framework for PRI returns is proposed detect moving targets by exploiting relationship of transmitting time sequences. It can achieve range velocity measurement without ambiguity. In addition, optimized weighted window in Doppler domain designed...

Optimizing highway alignments is a difficult combinatorial problem from engineering. The to find an alignment connecting two given end points such that the incurs minimal total costs. From past experience, it has been found critical success factors in optimizing of are good search algorithm, and efficient accurate way calculate costs highway. genetic algorithm (GA) choice as its stochastic nature global characteristic enables GA high quality solutions even for complex problems. solution cost...

Ambiguity clutter for airborne radar system is usually caused by uniform pulse repetition interval (UPRI) waveform, which significantly degrades target detection and location performance. To address this issue, paper proposes an ambiguity suppression method resorting to pseudorandom (PrPRI) waveform. First, model accounting multiple range rings with PrPRI waveform developed. Next, a non-uniform coherent processing framework introduced eliminate the folded in Doppler domain. In particular,...

This paper deals with the design of Doppler filter bank for non-uniform pulse repetition interval (PRI) radar in presence signal-dependent clutter. The worst-case Signal-to-Interference-Noise-Ratio (SINR) at output is explicitly maximized along mainlobe gain restriction. To solve resultant non-convex problem, a Parallel Block Improvement (PBI) algorithm proposed to monotonically increase SINR convergence. In particular, each block involves problem associated filter, which approximated...

This paper considers the coherent integration problem for moving target detection in phased-Multi-In Multi-Out (MIMO) radar. An method based on entropy is proposed to realize accumulation of signal energy multi-subarrays phased-MIMO Firstly, two dimension (fast time-slow time) model established. Secondly, differences phase along fast time are eliminated via frequency shift operation after range alignment, while Doppler induced by target's velocity then compensated using slow Fourier...

This paper deals with the Dual-Function Radar and Communication (DFRC) signal design for a Multiple-Input–Multiple-Output (MIMO) system, considering presence of signal-dependent clutter. A modulation methodology called Spectral Position Index Amplitude (SPIA) is proposed, which involves selecting passband stopband positions applying amplitude modulation. Signal to Interference plus Noise Ratio (SINR) maximized enhance radar detectability. Meanwhile, variable modulus communication constraints...

The existing separation of machine fault sources is only restricted to the linear mixing source signals. However, observed signals do not suffice this condition in practical application. In view deficiency, a new mechanical method based on nonlinear blind (BSS) proposed. proposed compared with BSS faults. experiment result shows that very effective for sources. faults special case method. When cannot give satisfactory performance, should be considered.

We study the spectral constrained design of Multiple-Input Multiple-Output (MIMO) radar beampattern in an effort to coexistence with communication systems. develop optimization model relying on minimization Integrate-Sidelobe-Level (ISL) along spectral, mainlobe width, Peak-to-Average Ratio (PAR) and energy constraints. To cope resultant non-convex problem, we introduce a novel polynomial-time iterative procedure that requires solving series convex problems evolve each iteration. In...

This paper deals with the detecting problem of tangential maneuvering target for airborne radar. To this end, we develop a transceiver design method via ambiguity function shaping which minimizes clutter echo power under constant modulus, peak-matching and signal-to-noise ratio loss constraints. Afterwards, transform it into two subproblems, solving them alternatively to monotonically decrease power. Simulation results demonstrate that proposed can successfully achieve detection in...

This paper deals with the joint design of transmit waveform and receive filter to improve clutter rejection capability for non-uniform pulse repetition interval (NUPRI) airborne radar. Specifically, a multipulse echo model accounting moving point-like target signal-dependent is first established. Then processed via matching windowed Doppler bank obtain two-dimensional range-Doppler plane. Further, integrated sidelobe level (ISLC) that spreads region interest in plane considered minimize...

In view of the many scenes unmanned aerial vehicle (UAV) detection, a third-party signal source is used to design receiver monitor UAV. It great significance understand reflection illuminating Taking communication base station (BS) as source, and considering complete transmission link, changes loss fading signal, this study conducts model fitting for irregular UAV targets, simplifying complex targets into combination simple targets. Furthermore, influence dielectric constant target surface...

Abstract This letter considers the robust design of radar waveform with discrete phase codes under constant modulus constraint to enhance target detectability. To solve resultant max‐min non‐convex optimization problem, a coding algorithm via iterative technology (R‐DPCA‐IT) is developed which monotonically improves worst‐case SNR and has an upper bound ensuring converge finite value. At each iteration, original multidimensional quadratic problem turned into multiple one‐dimensional problems...