What is the Radar Tracking 'Glint' Problem and Can It Be Solved

Borden, Brett

doi:10.21236/ada266509

Cited by 2 publications

(4 citation statements)

References 3 publications

(3 reference statements)

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“…The phase center of the receiver is located at the origin than the CRLB, makes a better approximation of the measurement error. 18 Glint is a measurement inaccuracy that occurs when multiple unresolvable reflectors on a target interfere to produce highly variable angular estimates [34]. The use of bistatic radar measurements (as opposed to monostatic) was observed to reduce the problem [318, pp.…”

Section: A the Local Coordinate Systemmentioning

confidence: 99%

“…For example, assuming that the estimate errors are approximately Gaussian distributed, an upper and lower bounds for a 99% confidence region 33 of the NEES for a d x = 3 and N MC = 1 000 are approximately 0.9347 and 1.0678; for d x = 6, they are 0.9645 and 1.0361. 34 The definition of a consistent estimator based on the NEES in (59) differs slightly from the more commonly cited definition given in [17,Ch. 5.4], where an estimator x̂ is consistent if…”

Section: A Estimator Consistencymentioning

confidence: 99%

“…This leaves 0.5% above and 0.5% below 34. These were numerically solved in the Mathematica software program.…”

mentioning

confidence: 99%

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Basic tracking using nonlinear 3D monostatic and bistatic measurements

Crouse¹

2014

IEEE Aerosp. Electron. Syst. Mag.

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Monostatic and bistatic position and Doppler measurements used in radar and sonar systems are nonlinear transformations of a Cartesian state. These nonlinearities pose a challenge for many target tracking algorithms, causing the so-called contact lens problem, which describes the nonlinear appearance of the measurement probability density function in Cartesian coordinates. This tutorial considers methods for measurement filtering (tracking without considering data association) using a single-Gaussian approximation when monostatic and bistatic position and Doppler measurements are available. The connection between the cubature Kalman filter and numerous other filtering algorithms is shown, and the accuracy and consistency of different algorithms are compared through simulation. An effort is made to express the geometric relationships associated with multistatic tracking in a simple vectorial manner. This tutorial focuses on basic tracking, and the companion tutorials "Tracking Using 3D Monostatic and Bistatic Measurements in Refractive Environments" and "Basic Tracking Using Nonlinear Continuous-Time Dynamic Models" extend the results to more sophisticated physical models.

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Section: A the Local Coordinate Systemmentioning

confidence: 99%

Section: A Estimator Consistencymentioning

confidence: 99%

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Basic tracking using nonlinear 3D monostatic and bistatic measurements

Crouse¹

2014

IEEE Aerosp. Electron. Syst. Mag.

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“…The algorithmic approach to detect wire employed here may be described as glint tracking. While glint is known to be a problem in other radar tracking applications, 8,9 here it is selectively used as a source. To achieve real time through-put, fast processing will be required.…”

Section: High Performance Computing Effortsmentioning

confidence: 99%

Proposed design of search radar for thin wire detection

Marble

Bishop

2009

SPIE Proceedings

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In this paper we look at the scattering of electromagnetic waves from thin wires. We propose a vehicle mounted search radar system that rotates 360 o about the vertical axis. Our wire of interest is lying on a lossy ground plane. It is generally flat but has many bends, which gives it a vertical extent. The system is designed using a wire scattering simulator to predict the response of a test wire to various illuminations. The simulator makes use of the Method of Moments technique to predict the scattering of E&M waves in 3D. Several approximations make the tool fast and versatile. Among these is the general assumption of the wire as a metal filament (with infinitesimal radius). To include a lossy ground plane we suggest the use of the NEC2 simulator. In the development of this problem, we first look at scattering from a 3D thin wire. The conclusion of the simulation phase of this work is that the cardinal f lash or glint response of the wire must be observed for the wire to be detectable. This response occurs when the wire is illuminated directly from the side. Because this scenario occurs at an unknown location as the vehicle passes by the wire, our design suggests the use of a spinning search radar. A brief experiment is performed using a search radar as a validation of concept. The observed glint response is shown and suggestions are made for how a practical system could reduce false alarms. We conclude the paper with a preferential configuration for a search radar suggested by simulation for this given application. OVERVIEWMonitoring the environment for metallic wire is a military objective. Wire is often used in the construction of barriers and traps, e.g., barbed wire, concertina wire, and tripwire obscurants. 1 When visual observation is obfuscated through dust or other optical obscurants, radar can be used as an alternative imaging methodology. Airborne and vehicular mounted radar systems have been used to locate metallic wires. 2,3,4 Most operational radar systems make use of the monostatic configuration where the transmit antenna is co-located with the receive antenna. Detection of thin wires depends on a bright response called the cardinal angle f lash or glint reflection. This occurs when the radar is perpendicular to the wire. When wire is laid-out on the ground in a hap-hazard way with many twists and turns, glint is possible from many viewing directions. Airborne systems take advantage of this to produce a detectable signature.To date, ground based systems have focused on forward looking configuration. Such sensors have had difficulty producing an observable signature because the glint is often missed. Unless the wire lies directly across the road, the radar will never be perpendicular to it, which is the condition necessary for generating the required glint response. This problem can be overcome by using a 360 o scanning, search radar. Such a system allows the opportunity for the radar system to illuminate a wire from the most opportunistic angle, provided it can travel past the wire's physical l...

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What is the Radar Tracking 'Glint' Problem and Can It Be Solved

Cited by 2 publications

References 3 publications

Basic tracking using nonlinear 3D monostatic and bistatic measurements

Basic tracking using nonlinear 3D monostatic and bistatic measurements

Proposed design of search radar for thin wire detection

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