The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
G Srivalli - One of the best experts on this subject based on the ideXlab platform.
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Simulation of Reflected Signal Spectrum of FMCW Radar for Different Terrain Conditions and Altitude
International Journal of Research, 2017Co-Authors: P. Preethi, G SrivalliAbstract:FMCW Radar is the popular principle for measuring the range/altitude in military and civilian applications. FMCW radar principle is used as Radio Altimeter application, where Altimeter is used to measure the height above ground level. It provides the altitude information of the aircraft from the terrain over which it is flying. Radar Altimeter operates in “C” band at 4.2GHz to 4.4GHz. The RAM transmits the FMCW signal and captures the reflected signal from the terrain. The altitude information is computed by analyzing the beat frequency spectrum using DSP signal processing techniques. Testing the Radio Altimeter at different terrain condition such as water and grass at practical condition is not available on bench and hence needs to be tested on aircraft which involves high cost for every flight test. Hence in order to test the FMCW Radar for different terrain conditions “SYSTEMVUE” software provided by KEYSIGHT technologies is used. This software is used for developing the model to simulate the reflected signal pattern at different terrain conditions on bench, which reduces the flight cost and used to measure the altitude range for different delays. .
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Simulation of Reflected Signal Spectrum of FMCW Radar for Different Terrain Conditions and Altitude
International Journal of Research, 2017Co-Authors: P. Preethi, G SrivalliAbstract:FMCW Radar is the popular principle for measuring the range/altitude in military and civilian applications. FMCW radar principle is used as Radio Altimeter application, where Altimeter is used to measure the height above ground level. It provides the altitude information of the aircraft from the terrain over which it is flying. Radar Altimeter operates in “C” band at 4.2GHz to 4.4GHz. The RAM transmits the FMCW signal and captures the reflected signal from the terrain. The altitude information is computed by analyzing the beat frequency spectrum using DSP signal processing techniques. Testing the Radio Altimeter at different terrain condition such as water and grass at practical condition is not available on bench and hence needs to be tested on aircraft which involves high cost for every flight test. Hence in order to test the FMCW Radar for different terrain conditions “SYSTEMVUE” software provided by KEYSIGHT technologies is used. This software is used for developing the model to simulate the reflected signal pattern at different terrain conditions on bench, which reduces the flight cost and used to measure the altitude range for different delays. .
P. Preethi - One of the best experts on this subject based on the ideXlab platform.
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Simulation of Reflected Signal Spectrum of FMCW Radar for Different Terrain Conditions and Altitude
International Journal of Research, 2017Co-Authors: P. Preethi, G SrivalliAbstract:FMCW Radar is the popular principle for measuring the range/altitude in military and civilian applications. FMCW radar principle is used as Radio Altimeter application, where Altimeter is used to measure the height above ground level. It provides the altitude information of the aircraft from the terrain over which it is flying. Radar Altimeter operates in “C” band at 4.2GHz to 4.4GHz. The RAM transmits the FMCW signal and captures the reflected signal from the terrain. The altitude information is computed by analyzing the beat frequency spectrum using DSP signal processing techniques. Testing the Radio Altimeter at different terrain condition such as water and grass at practical condition is not available on bench and hence needs to be tested on aircraft which involves high cost for every flight test. Hence in order to test the FMCW Radar for different terrain conditions “SYSTEMVUE” software provided by KEYSIGHT technologies is used. This software is used for developing the model to simulate the reflected signal pattern at different terrain conditions on bench, which reduces the flight cost and used to measure the altitude range for different delays. .
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Simulation of Reflected Signal Spectrum of FMCW Radar for Different Terrain Conditions and Altitude
International Journal of Research, 2017Co-Authors: P. Preethi, G SrivalliAbstract:FMCW Radar is the popular principle for measuring the range/altitude in military and civilian applications. FMCW radar principle is used as Radio Altimeter application, where Altimeter is used to measure the height above ground level. It provides the altitude information of the aircraft from the terrain over which it is flying. Radar Altimeter operates in “C” band at 4.2GHz to 4.4GHz. The RAM transmits the FMCW signal and captures the reflected signal from the terrain. The altitude information is computed by analyzing the beat frequency spectrum using DSP signal processing techniques. Testing the Radio Altimeter at different terrain condition such as water and grass at practical condition is not available on bench and hence needs to be tested on aircraft which involves high cost for every flight test. Hence in order to test the FMCW Radar for different terrain conditions “SYSTEMVUE” software provided by KEYSIGHT technologies is used. This software is used for developing the model to simulate the reflected signal pattern at different terrain conditions on bench, which reduces the flight cost and used to measure the altitude range for different delays. .
Yong Wang - One of the best experts on this subject based on the ideXlab platform.
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a device used to verify climb descent rate of Radio Altimeter
International Conference on Measuring Technology and Mechatronics Automation, 2010Co-Authors: Yinqiang Zhou, Yong WangAbstract:A device used to verify climb/descent rate(ROCD) of Radio Altimeter is introduced. The components and structure of the device are described in detail. And its working principle is also present. The measurement accuracy and error are analyzed. With actual data gotten from the verification of a certain type of Radio Altimeter, the important role of this device in the development of auto-landing system for a UAV (Unmanned Aerial Vehicle) is discussed.
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A Device Used to Verify Climb/Descent Rate of Radio Altimeter
2010 International Conference on Measuring Technology and Mechatronics Automation, 2010Co-Authors: Yinqiang Zhou, Yong WangAbstract:A device used to verify climb/descent rate(ROCD) of Radio Altimeter is introduced. The components and structure of the device are described in detail. And its working principle is also present. The measurement accuracy and error are analyzed. With actual data gotten from the verification of a certain type of Radio Altimeter, the important role of this device in the development of auto-landing system for a UAV (Unmanned Aerial Vehicle) is discussed.
Singaravelu Raghavan - One of the best experts on this subject based on the ideXlab platform.
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siw cavity backed antenna triplexer for Radio Altimeter wi fi applications
2018 IEEE Indian Conference on Antennas and Propogation (InCAP), 2018Co-Authors: Divya Chaturvedi, B. Murugeshwari, Arvind Kumar, Singaravelu RaghavanAbstract:A new design of substrate integrated waveguide (SIW) cavity-backed antenna-triplexer is proposed for Radio Altimeter and Wi-Fi applications. The proposed design comprises two half-mode like SIW cavities and a rectangular patch. Both parts of the cavity and the patch are separated with the help of an annular slot on the top surface. The proposed design produces three distinct resonances around 4.2, 5.2, and 5.8 GHz, when the geometry is excited by two microstrip feedlines and coax-probe. To avoid mutual coupling among the ports, the patch is excited orthogonal to the cavity. The proposed design is fabricated and experimentally verified. The experimental results show good matching with simulations and an intrinsic isolation better than 23.5 dB is achieved between any two input ports which helps to realize a triplexing mechanism. Moreover, the proposed design has the advantages of low cross-polarization, higher gain with unidirectional radiation performance.
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SIW Cavity-Backed Antenna-Triplexer for Radio Altimeter/Wi-Fi Applications
2018 IEEE Indian Conference on Antennas and Propogation (InCAP), 2018Co-Authors: Divya Chaturvedi, B. Murugeshwari, Arvind Kumar, Singaravelu RaghavanAbstract:A new design of substrate integrated waveguide (SIW) cavity-backed antenna-triplexer is proposed for Radio Altimeter and Wi-Fi applications. The proposed design comprises two half-mode like SIW cavities and a rectangular patch. Both parts of the cavity and the patch are separated with the help of an annular slot on the top surface. The proposed design produces three distinct resonances around 4.2, 5.2, and 5.8 GHz, when the geometry is excited by two microstrip feedlines and coax-probe. To avoid mutual coupling among the ports, the patch is excited orthogonal to the cavity. The proposed design is fabricated and experimentally verified. The experimental results show good matching with simulations and an intrinsic isolation better than 23.5 dB is achieved between any two input ports which helps to realize a triplexing mechanism. Moreover, the proposed design has the advantages of low cross-polarization, higher gain with unidirectional radiation performance.
Arthur V Amaral - One of the best experts on this subject based on the ideXlab platform.
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improved landing Radio Altimeter for unmanned aerial vehicles based on an antenna array
International Conference on Ultra Modern Telecommunications, 2012Co-Authors: Ronaldo S Ferreira, Marco A M Marinho, Kefei Liu, Joao Paulo C L Da Costa, Arthur V AmaralAbstract:Unmanned aerial vehicles (UAVs) are used in various applications such as civil and military surveillance, law enforcement, and support in natural disasters as well as in hazardous environments. Approaching and landing are necessary steps for all UAVs, indicating that Radio Altimeters are needed. In this paper, a Radio Altimeter based on an antenna array is proposed. Our solution allows some improvements over the traditional Radio Altimeter such as more precise altitude estimation, ground imaging without the need of side looking radar, mapping the obstacles positions and detecting the ground inclination and topology. Another important contribution of this paper is a review of traditional Radio Altimeters along with a performance comparison between the level-crossing detection and the digital signal processing frequency detection - which is based on the fast Fourier transform algorithm.
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ICUMT - Improved landing Radio Altimeter for unmanned aerial vehicles based on an antenna array
2012 IV International Congress on Ultra Modern Telecommunications and Control Systems, 2012Co-Authors: Ronaldo S Ferreira, Marco A M Marinho, Kefei Liu, Joao Paulo C L Da Costa, Arthur V AmaralAbstract:Unmanned aerial vehicles (UAVs) are used in various applications such as civil and military surveillance, law enforcement, and support in natural disasters as well as in hazardous environments. Approaching and landing are necessary steps for all UAVs, indicating that Radio Altimeters are needed. In this paper, a Radio Altimeter based on an antenna array is proposed. Our solution allows some improvements over the traditional Radio Altimeter such as more precise altitude estimation, ground imaging without the need of side looking radar, mapping the obstacles positions and detecting the ground inclination and topology. Another important contribution of this paper is a review of traditional Radio Altimeters along with a performance comparison between the level-crossing detection and the digital signal processing frequency detection - which is based on the fast Fourier transform algorithm.
