Ultrawideband radar is commonly used in the frequency range of 50-500 MHz to detect buried pipes at a depth about 1-2 m depending on soil characteristics. The typical feature locate hyperbolic pattern time flight generated by linear scan antenna above surface. When are close together, hyperbolas overlap, and straightforward least squares fit not possible. Hough transform provides one possible solution. This paper extends introducing weighting factor differentials unknown parameters with...

This article presents a new UWB impulse radar system consisting of central radiating antenna (1.9-GHz center frequency, 2-GHz bandwidth) and four receiving antennas designed for the detection location dielectrically large objects with dimensions comparable to spatial probe pulse. Together system, solution method determining coordinates detected targets is developed based on time flight (TOF) probing pulse along raypaths from object, then reflected each antennas. An algorithm Pearson's...

The generalised Hough transform method is applied to the measurement of diameters buried cylindrical pipes by Ground Penetration Radar (GPR). 600 MHz radar scans across long pipes, in one metre or so soil, show complex reflection patterns consisting a series inverted hyperbolic arcs. time flight t(y) as probe scanned along an axis, y, perpendicular pipe, shows arc whose shape depends on four unknown variables: y 0 , position centre pipe scan, z depth centre, R, its radius and V velocity...

Abstract This paper explores the application of RASCAN holographic radar for non‐destructive subsurface imaging works art and architecture. provides high‐resolution plan‐view images shallow in dielectric materials. The is particularly sensitive to small metallic targets, but also variations moisture content. Originally developed detection hidden bugging devices, sounding building construction details, landmines, here utility architectural preservation studies demonstrated by several...

We have developed a stand-off holographic subsurface radar (HSR)operating at 2 GHz with amplitude and phase outputs for detection classification of buried shallow objects, including plastic landmines. The microwave holograms obtained in this way contain information about the size shape objects within penetration depth. reconstruction electromagnetic field on plane parallel to scanning has been repeatedly addressed literature; however, propagation incident through air-soil interface generates...

Abstract In this article we study a simple model for describing the electron behavior in heterogeneous material characterized by two energy bands. The model, so-called Kane system, is composed of Schrödinger-like equations coupled k · P term which describes interband tunneling. We give physical justification system and reformulate it terms Wigner functions. well-posedness corresponding investigated suitable Hilbert space.

This paper describes the development of an impulse GPR configuration suitable for detection buried targets in natural soils - particularly Eastern Ukraine conflict zone. The design has incorporated requirements a lightweight and compact system to be installed as one component multi-sensor robotic scanner. antennae have been placed such that footprint at 2 GHz remains sufficiently large scan area with dimensions larger than typical plastic- or metal-cased landmine. target positioning...

An impulse UWB GPR antenna system consisting of one transmitter and four receivers has been designed for rapid detection objects on, under, the ground surface. The measured two-way times-of-flight reflected probing signals (from radiator to object back receivers) are used calculate (x, y, z) coordinates reflecting object. For cases where several (due e.g. reflections from vehicle or other noise) recorded, criteria enabling selection unique that correspond true target have determined verified.

Abstract In this paper we present three applications of a polygonal method to the approximate solution one dimensional Stefan problem with nonlinear boundary conditions on fixed face. Our results extend previous approaches which have appeared in literature. same time regularity assumptions initial data are relaxed and great simplification is obtained proof arguments; moreover error estimates performed general case.

We develop a rigorous formalism for the description of evolution observables in quantum systems particles. construct solution initial-value problem to dual BBGKY hierarchy equations as an expansion over particle clusters whose are governed by corresponding-order cumulant (dual semi-invariant) operators finitely many For initial data from space sequences bounded existence and uniqueness theorem is proved.

An experimental setup for acoustoseismic detection of shallow buried objects is presented. The seismic (Rayleigh) waves were generated by exciting an acoustic airborne source a series sine-wave bursts, which designed to cover frequency range (100-1000 Hz) large enough distinguish the vibrational characteristics compliant objects. signals recorded means contact-acceleration microelectromechanical-system sensors moved above different (compliant and rigid). Signal acquisitions on only sandy...

Acoustic methods have been recently investigated for the detection of shallow landmines. Some plastic landmines a compliant case which can made to vibrate by an airborne excitation like loudspeaker. Our study is based on possibility detect contact or non-contact sensors accelerometers phonometers. Phonometers provide sufficient seismic sensitivity but their response influenced direct acoustic wave coupling from driving source. On contrary are much less and they high acquire soil surface...

The RASCAN holographic radar system has been developed by the Remote Sensing Laboratory of Bauman Moscow Technical University.The present design uses five frequencies and two polarisations to give 10 distinct images scan from buried objects.Because sinusoidal phase variation interference signals, all displays show a complex picture dark light phases which vary in complicated way between different polarizations.This is preliminary investigation into optimal presentation as single composite...

A new device is presented for the detection of compliant objects buried in shallow soil by their vibrational characteristics. The based on concept a sensorized prodder that can measure acceleration point surface object with rigid steel rod. This paper presents simple model able to simulate frequency response system composed and object. Direct laboratory measurements and/or parametric inspection mechanical characteristics test allow us select suitable range detect objects. developed...

Field tests of the robotic platform "UGO-1st" have revealed interference sources that complicate automatic detection subsurface objects by UWBGPR. Although robust target discrimination criteria make it possible to reduce probability false alarms, identification these improves algorithm. The focus this work is on elimination sources, which include: direct coupling between radar antennas; reflections from components platform; soil surface; instability GPR signal due temperature drift during a...

In this paper we derive a semiclassical hydrodynamic system for electron densities and currents in the two energy bands of semiconductor. We use Wigner equation with k.p Hamiltonian BGK dissipative term to construct first moment equations. The closure is obtained using Maximum Entropy Principle, by minimizing Gibbs free-energy functional under suitable constraints. prove that constraint equations can be uniquely solved, i.e. local equilibrium state parametrized density velocity field. Some...

Abstract We study the one-dimensional streaming operator in a slab domain with boundary conditions of Maxwell type. By using techniques theory semigroups linear operators L1 space context, we prove that is infinitesimal generator strongly continuos semigroup, even if “particle multiplying”. This semigroup positive, quasi-bounded and obviously not contractive.

Acoustic methods have been recently investigated for the detection of shallow landmines. Some plastic landmines a flexible case which can made to vibrate by an airborne excitation like loudspeaker. The soil-mine system shows resonant behavior is used as signature discriminate from other rigid objects. mechanical resonance be detected at soil surface remote sensing systems laser interferometer. An equivalent physical model mine-soil has having known characteristics mine simulants. authors...

Monitoring of respiratory movements is an important feature in planning medical care. We present here a simple, portable, accelerometer-based device suitable for long term-monitoring the breathing and heart rates, along with postural changes, during sleep wakefulness. Recordings frequency, rate, posture voluntary cough were obtained from group volunteers who also participated studies (6-8 hrs). A pair capacitive MEMS tri-axial accelerometers was positioned at level 10 rib mid-axillary line...

Abstract We study the one-dimensional free streaming operator in a slab domain with general boundary conditions described by linear positive Λ. Under assumptions that Λ−1 exists and is TΛ resolvent positive, we prove infinitesimal generator of strongly continuous semigroup, which contractive if ∥ Λ ≤ 1 quasi-bounded > 1. give also mathematical definition dissipative, conservative multiplying walls terms Λ, show how these properties can affect type semigroup generated TΛ.

This paper presents the experimental results for an acousto-seismic buried landmine detection method. The excitation source used was a woofer loudspeaker and lightweight silicon MEMS accelerometers were adopted to measure ground surface acceleration. experiments performed in outdoor unconsohdated sand test-bed with several kinds of compliant rigid test-objects, all at depth 4cm placed distances ranging from 10cm 50cm. different responses objects processed both time frequency domains. A novel...