The calibration of weather radar for detecting meteorological phenomena has advanced rapidly, aiming to enhance accuracy. Utilizing an unmanned aerial vehicle (UAV) equipped with a suspended metal sphere introduces an...
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ISBN:
(纸本)9798350389968
The calibration of weather radar for detecting meteorological phenomena has advanced rapidly, aiming to enhance accuracy. Utilizing an unmanned aerial vehicle (UAV) equipped with a suspended metal sphere introduces an efficient calibration method by allowing dynamic adjustment of the UAV's position, effectively acting as a mobile calibration platform. However, external factors such as wind can introduce bias in reflectivity measurements by causing the sphere to deviate from its intended position. This study develops a theoretical model to assess the impact of the metal sphere's one-dimensional oscillation on reflectivity. The findings offer valuable insights for UAV-based radar calibration efforts.
This paper introduces an overview of a novel sensor fusion model for identifying wind turbines (WTs) that cause interference in polarimetric Doppler weather radar measurements. It is important to acknowledge that the ...
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The accurate calibration test of the first active remote sensing instrument, the FY-3E wind field measurement radar, relies on data provided by globally distributed stable targets. Utilizing data acquired from high-pr...
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ISBN:
(纸本)9798350389968
The accurate calibration test of the first active remote sensing instrument, the FY-3E wind field measurement radar, relies on data provided by globally distributed stable targets. Utilizing data acquired from high-precision microwave radar scatterometers HY-2B SCAT, more than 107 regions around the world with stable backscattering coefficients are screened, including the Greenland, the Amazon rainforest, and the Congo Forest, to identify areas suitable for the on-orbit calibration test of the FY-3 series.
This paper explores the measurement of radar Cross Section (RCS) of targets utilizing scattering center extraction technology. The imaging of targets is achieved through the application of the Back-Projection (BP) alg...
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ISBN:
(纸本)9798350389968
This paper explores the measurement of radar Cross Section (RCS) of targets utilizing scattering center extraction technology. The imaging of targets is achieved through the application of the Back-Projection (BP) algorithm, while the position and scattering intensity of the target's scattering centers are discerned through the utilization of CLEAN and Matching Pursuit algorithms. The scattering electric field is then reconstructed using the identified scattering centers, facilitating the inversion of the target's RCS. The validity and efficacy of these algorithms in measuring target RCS are affirmed through a comparative validation, comparing inversion results with simulated outcomes.
This research topic aims at designing a high-performance millimeter-wave radar digital processing accelerator. According to the current millimeter-wave radar point cloud generation algorithm, the internal computing co...
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ISBN:
(纸本)9798350389968
This research topic aims at designing a high-performance millimeter-wave radar digital processing accelerator. According to the current millimeter-wave radar point cloud generation algorithm, the internal computing components of the accelerator mainly include Fast Fourier Transform(FFT), Constant False Alarm Rate(CFAR), windowing, and other submodules. To minimize the interference of the central processor with this accelerator as much as possible, this research designs an operational register that is highly versatile, reusable, and circular. After parameter programming by the user, the accelerator can independently and continuously complete the operation of the point cloud generation algorithm. The experiments show that the accelerator can independently calculate complex sample data of 256*32 size without external interference. After the operations of 2DFFT and ABS, the relative error remains below 10% compared to MATLAB. The computational results of 2D-CFAR are entirely consistent with the simulated results from MATLAB.
Frequency-modulated continuous wave (FMCW) is the dominant waveform scheme in modern automotive radar systems used in advanced driver assistance systems (ADASs). Nevertheless, the digital modulation scheme phase-modul...
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The digital transceiver is one of the core components of the spaceborne radar transceiver subsystem. In this paper, a 600 MHz wideband anti-radiation digital transceiver with four cold back-up receiving and dual trans...
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ISBN:
(数字)9798350389968
ISBN:
(纸本)9798350389968
The digital transceiver is one of the core components of the spaceborne radar transceiver subsystem. In this paper, a 600 MHz wideband anti-radiation digital transceiver with four cold back-up receiving and dual transmitting channel is designed, by using digital transceiver technology for wideband RF (radio frequency) based on software defined radio. The design has been stably operated in a commercial space borne project with ground resolution up to 0.5 m.
This paper presents a novel K-Band Quadrature Phase Shift Keying (QPSK) phase-modulated continuous-wave (PMCW) radar front end architecture with digital I/Q constellation phase compensation and I/Q channel imbalance c...
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Surveillance radar systems equipped with active electronically scanned antenna arrays (AESA) typically operate with low spatial resolution (50 to 100 m). Under these conditions, the data transformation from the radar ...
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ISBN:
(纸本)9781510674158;9781510674141
Surveillance radar systems equipped with active electronically scanned antenna arrays (AESA) typically operate with low spatial resolution (50 to 100 m). Under these conditions, the data transformation from the radar signal in the frequency, array position and slow time dimensions to the reflectivity map in the range, angle and Doppler dimensions is conventionally performed by a 3-D fast Fourier transform (FFT). In this paper, we consider a radar system equipped with a wide, near-field array, providing high angular resolution, and examine the changes required in the matched filter-based signal processing to accommodate this sensing geometry. Beamforming techniques that include exact, approximate, FFT-based and sparse-array-based matched filter implementations are investigated. Additionally, we consider joint Doppler-azimuth mapping with wide antenna arrays, while the system operates with narrowband waveforms to allow decoupling of range from the other two signal dimensions. In the numerical examples, we demonstrate a 200-m-wide, S-band sparse array capable of achieving 0.03 degrees resolution in azimuth. Processing with a fully coupled, high range resolution system equipped with a wide antenna array will be investigated in a future publication.
Wireless ranging and positioning plays a pivotal role across numerous applications, encompassing wireless networks, robotics, navigation, and distributed wireless systems. A common limitation encountered in many rangi...
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ISBN:
(纸本)9781510674158;9781510674141
Wireless ranging and positioning plays a pivotal role across numerous applications, encompassing wireless networks, robotics, navigation, and distributed wireless systems. A common limitation encountered in many ranging algorithms relates to the requirement for waveforms with sufficiently wide bandwidth to attain precise ranging accuracy. In this study, we investigate the applicability of orthogonal frequency-division multiplexing (OFDM) signals for microwave-ranging without necessitating any modifications. OFDM, being a joint communications and sensing waveform, offers the advantage of repurposing existing communication signals for ranging purposes without additional spectrum utilization. We discuss the theoretical underpinnings of our investigation and present simulated and experimental ranging measurements employing OFDM signals, complemented by range estimation and error analyses.
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