1,721,324 research outputs found
Design of compact and low-power X-band Radar for mobility surveillance applications
Full text linkThis paper presents the design of a compact Radar for real-time detection of targets in smart mobility applications. The Radar integrates Fabry–Perot resonating antennas, X-band and configurable continuous wave transceiver, high-speed analog-digital-converter and low-power/low-cost FPGA for the baseband signal processing. The latter includes region-of-interest selection, 2D Fast Fourier Transform for range-Doppler map extraction, peak detection and alarm decision logic. The transmitted power can be configured from few mW to 1.8 W. This allows for a trade-off between the maximum detection range, from few hundreds of meters up to 1.54 km, and the Radar power consumption, from 2.56 W to 11.66 W. The measured speed is up to 40 m/s. The speed and distance resolutions are 0.3 m/s and 37.5 cm, respectively. The configurable Radar features increased robustness vs. laser-scanners, video cameras, or induction loops detection techniques, and stands for its better trade-off in terms of covered range, size, and low-power consumption vs. state-of-the-art surveillance Radars
Analysis of Conditional Stability and Unconditional Stability and Instability for Microwave 3-Ports
No full textA full and rigorous treatment of conditional and unconditional stability and instability for an active 3-port microwave circuit, represented at a given frequency by S-parameters, is carried out. By terminating a given port with a variable termination one may study at the input and the output of the resulting 2-port circuit the occurrence of unconditional stability and instability, as well as of special cases of conditional stability, defined as reactive unconditional stability or instability. Such conditions are especially relevant in microwave oscillator design and were exhaustively identified for the first time and treated in previous analysis by the authors. Drawing from its conclusions, one obtains in the plane of the variable termination and with a simple algorithm, a single parametric representation, providing at once, in a closed and direct form, the entire collection of boundaries of the regions, wherein the listed conditions occur at ports of the resulting 2-port circuit. Guidelines for the design of microwave amplifiers and oscillators, both in series and shunt configuration, are sketched. Numerical examples, validated by simulations, are also presented
Low Frequency noise measurements as a characterization tool for degradation phenomena in solid-state divices
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Low-Power Radar Front-End for E-Health and Harbor Surveillance: Implementation Examples
No full textChapter 6 of the book HIGHLY
INTEGRATED LOW-POWER RADARSwith a focus on a FMCW radar for harbour surveillanc
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