The scaled RCS measurement method for lossy targets via dynamically matching the reflection coefficients in the THz band

Abstract In the terahertz band, the dispersive characteristic of dielectric material is one of the major problems in the scaled radar cross section (RCS) measurement, which is inconsistent with the electrodynamics similitude deducted according to the Maxwell’s equations. Based on the high-frequency estimation method of physical optics (PO), a scaled RCS measurement method for lossy objects is proposed through dynamically matching the reflection coefficients according to the distribution of the object’s facets. Simulations on the model of SLICY were conducted, the inversed RCS of the lossy prototype was obtained using the proposed method. Via comparing the inversed RCS with the calculated results, the validity of the proposed method is demonstrated. The proposed method provides an effective solution to the scaled RCS measurement for lossy objects in the THz band.

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A context-aware frequency estimation method for wireless passive resonant SAW sensors

Sensor Review ◽

10.1108/sr-05-2017-0071 ◽

2017 ◽

Vol 37 (4) ◽

pp. 458-467

Author(s):

Boquan Liu ◽

Pinghua Tang

Keyword(s):

Measurement Method ◽

Design Methodology ◽

Frequency Estimation ◽

Estimation Method ◽

Frequency Measurement ◽

Wireless Channel ◽

Physical Parameters ◽

Medical Applications ◽

Context Aware ◽

Content Type

Purpose This paper aims to present an context evaluation and frequency measurement method for surface acoustic wave (SAW) resonant sensor. Design/methodology/approach This method is based on a signal subspace construction, which, along with assembling optional value set, provides the results. Findings The method can assess the application context and improve the resolution and accuracy of the passive wireless SAW resonator sensor system. Originality/value Passive wireless SAW resonators have been used as sensor elements for different physical parameters such as temperature, pressure and force in a number of industrial and medical applications. Various wireless channel environments introduce different application contexts.

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An effective methodology to design scale model of non-metallic structural entity

MATEC Web of Conferences ◽

10.1051/matecconf/201824201008 ◽

2018 ◽

Vol 242 ◽

pp. 01008

Author(s):

Liming Yuan ◽

Zhijie Xie ◽

Fei Dai ◽

Yonggang Xu ◽

Yuan Zhang

Keyword(s):

Cross Section ◽

High Frequency ◽

High Accuracy ◽

Practical Significance ◽

Scale Model ◽

Mean Deviation ◽

Reflection Coefficients ◽

The Mean ◽

Structural Entity ◽

Frequency Approximation

In order to solve the problem on designing scale model of non-metallic structural entity, a method is first proposed according to the high-frequency approximation algorithm, in which reflection coefficients of designed scale model are optimized to be as identical as possible with those of theoretical scale model. An example is given to verify the effectiveness of the method, where a non-metallic cone is constructed and FEKO is employed to simulate the monostatic radar Cross Section (RCS) of the designed scale cone and the theoretical scale cone. Result reveals that the monostatic RCS of the designed scale cone agrees very well with that of the theoretical scale cone. The mean deviation of the monostatic RCS is just 1.31 dB in simulated elevation angles of 0°~90°. Thus, the method proposed in this paper is of important theoretical and practical significance in constructing scale model of high accuracy.

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