ABSTRACT In this paper, we present simulations of a microwave sensor in a cylindrical leaky metal... more ABSTRACT In this paper, we present simulations of a microwave sensor in a cylindrical leaky metallic cavity partially filled with arbitrary shaped material samples. E01n resonant modes where excited by a funnel shaped monopole inside the front door of the cavity. A preprocessing stage was used to generate a proper database of characteristic values from the magnitude of the scattering param-eter |S11| of the received signal only, since the phase information is not available for low cost applications. Subsequently, by using a multilayer perceptron (MLP) network, the dielectric constant, the dielectric losses and the amount of the unknown material can be accurately extracted from these characteristic values. Detailed investigations to the input values where done to un-derstand the complexity of the problem. MLP-networks with different numbers of inner neurons where trained using only less than half of the generated database for test and validation. Accurate results for the detection of the dielectric constant and the losses of the material where obtained whereas the detection of the material size is relatively poor.
Ieee Transactions on Microwave Theory and Techniques, Nov 1, 2007
In this paper, the novel inverse synthetic aperture secondary radar wireless positioning techniqu... more In this paper, the novel inverse synthetic aperture secondary radar wireless positioning technique is introduced. The proposed concept allows for a precise spatial localization of a backscatter transponder even in dense multipath environments. A novel secondary radar signal evaluation concept compensates for the unknown modulation phase of the returned signal and thus leads to radar signals comparable to common primary
ABSTRACT The accuracy of a radar operating in a multipath environment or in presence of strong cl... more ABSTRACT The accuracy of a radar operating in a multipath environment or in presence of strong clutter noise is mainly limited by the radar signal bandwidth. In the actual paper a phase evaluation concept is introduced that allows for the estimation of the distance of a moving target with mm accuracy even under the above mentioned conditions. The concept is based on an algorithm that combines beat frequency and phase acceleration estimations. The paper will discuss the theoretical background of the approach and the performance of the concept will be illustrated by measurement results of a 5.8 GHz secondary radar system.
2009 IEEE MTT-S International Microwave Workshop on Wireless Sensing, Local Positioning, and RFID, 2009
Over the last years tremendous improvements of wireless positioning systems have been achieved. S... more Over the last years tremendous improvements of wireless positioning systems have been achieved. System accuracy has improved drastically and maturity changed from hand-soldered lab demonstrators to commercial products. In parallel applications moved from small, experimental installations to coverage of complete sites. Consequently the research focus shifts away from the positioning core technology to system aspects. Critical issues now are simultaneous
ABSTRACT In this paper, we present simulations of a microwave sensor in a cylindrical leaky metal... more ABSTRACT In this paper, we present simulations of a microwave sensor in a cylindrical leaky metallic cavity partially filled with arbitrary shaped material samples. E01n resonant modes where excited by a funnel shaped monopole inside the front door of the cavity. A preprocessing stage was used to generate a proper database of characteristic values from the magnitude of the scattering param-eter |S11| of the received signal only, since the phase information is not available for low cost applications. Subsequently, by using a multilayer perceptron (MLP) network, the dielectric constant, the dielectric losses and the amount of the unknown material can be accurately extracted from these characteristic values. Detailed investigations to the input values where done to un-derstand the complexity of the problem. MLP-networks with different numbers of inner neurons where trained using only less than half of the generated database for test and validation. Accurate results for the detection of the dielectric constant and the losses of the material where obtained whereas the detection of the material size is relatively poor.
Ieee Transactions on Microwave Theory and Techniques, Nov 1, 2007
In this paper, the novel inverse synthetic aperture secondary radar wireless positioning techniqu... more In this paper, the novel inverse synthetic aperture secondary radar wireless positioning technique is introduced. The proposed concept allows for a precise spatial localization of a backscatter transponder even in dense multipath environments. A novel secondary radar signal evaluation concept compensates for the unknown modulation phase of the returned signal and thus leads to radar signals comparable to common primary
ABSTRACT The accuracy of a radar operating in a multipath environment or in presence of strong cl... more ABSTRACT The accuracy of a radar operating in a multipath environment or in presence of strong clutter noise is mainly limited by the radar signal bandwidth. In the actual paper a phase evaluation concept is introduced that allows for the estimation of the distance of a moving target with mm accuracy even under the above mentioned conditions. The concept is based on an algorithm that combines beat frequency and phase acceleration estimations. The paper will discuss the theoretical background of the approach and the performance of the concept will be illustrated by measurement results of a 5.8 GHz secondary radar system.
2009 IEEE MTT-S International Microwave Workshop on Wireless Sensing, Local Positioning, and RFID, 2009
Over the last years tremendous improvements of wireless positioning systems have been achieved. S... more Over the last years tremendous improvements of wireless positioning systems have been achieved. System accuracy has improved drastically and maturity changed from hand-soldered lab demonstrators to commercial products. In parallel applications moved from small, experimental installations to coverage of complete sites. Consequently the research focus shifts away from the positioning core technology to system aspects. Critical issues now are simultaneous
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Papers by Peter Gulden