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Osaka University, Toshiba and the Osaka Local Government started a new project to develop the Osaka Urban Demonstration Network. The main sensor of the Osaka Network is a 2-node Phased Array Radar Network and lightning location system. Data products that are created both in local high performance computer and Toshiba Computer Cloud, include single and multi-radar data, vector wind, quantitative precipitation...
GPR is one of the most reliable instruments to obtain information on subsoil utilities and since its diffusion many efforts have been made in order to reduce the effect of the “human factor” during the data interpretation phase, and to maximize the amount of the surface to be investigated per unit time during data acquisition.
Advancements in high level integration of MMIC in package have led to the development of a system comprising of a multi-channel transceiver with antenna in package (AiP). Multi-channel systems provide additional advantage by enabling digital beamforming for direction of arrival estimation at 60 GHz. Different beamforming techniques are studied and practically implemented with a radar platform to find...
This paper describes the Front-X, a dual-polarized X-band Phased Array Weather Radar system currently being developed at Colorado State University. The architecture of this mobile radar is presented, with a description of the antenna array, waveform synthesis and digital receiver/pulse compressor modules. Initial observations made with the phased array weather radar are also shown.
In our previous publication, we have designed a ground penetrating radar (GPR) system with and antenna array for in-situ estimation of the thickness and dielectric permittivity of the asphalt pavement. In this paper, we change the work mode of the GPR antenna array from the ground-coupled mode to the off-ground one, accelerating the data acquisition speed required for highway inspection. The GPR antenna...
The concept of transform sensing was recently proposed to operate radars which consist of multiple antenna elements, for high efficiency and resolution. Using transform sensing, phase delays between and amplitudes of elements are no longer constant as in conventional phased array radars. The purpose is to produce any type of spatial sensing pattern that can be applied to the space for efficient sensing...
We present an iterative method for joint antenna-array calibration and direction of arrival estimation using millimeter-wave (mm-Wave) radar operating at 77 GHz. The calibration compensates for antennaarray coupling, and phase and gain errors, and does not require any training data. This method is well suited for applications, such as automotive radars, where multiple antenna elements are packaged...
High-resolution frontal radar images of humans can be generated in free space conditions with a Doppler radar with a large radar aperture. Compressed sensing based two dimensional beamforming enables imaging of humans with sub-Nyquist number of elements in the radar aperture. In this work, we apply this imaging technique to humans in through-wall scenarios in indoor environments. Walls are complex...
We have been developed two radars for radial Doppler velocity measurements: a coherent marine radar (COHrad), and a standard marine radar modified to coherent-on-receive capability (CORrad). Both measure the intensity and the radial velocity component of the radar echo. The latter can be used to generate orbital wave velocity spatial maps of ocean waves, as well as the mean radial ocean surface velocity...
Compressive sensing (CS) in radar is presented at the system level with emphasis on the front end that keeps the functionality of data acquisition. In CS, the data acquisition is compressive as it delivers fewer measurements. We explore spatial compressive acquisition of radar measurements by the existing means available in a radar system: design of antenna arrays (AA), and focus here on active co-prime...
Front wall reflections are considered one of the main challenges in sensing through walls using radar. This is especially true under sparse time-space or frequency-space sampling of radar returns which may be required for fast and efficient data acquisition. Unlike homogeneous walls, heterogeneous walls have frequency and space varying characteristics which violate the smooth surface assumption and...
This paper describes the design and fabrication of a novel dual-band slotted waveguide antenna array for radar applications. The radiation structure is composed by two groups of slots, milled into the rectangular waveguide in opposite faces, enabling the antenna operation over two different frequency bands. Using this innovative structure becomes possible to perform diverse sorts of tracking using...
This paper presents preliminary experiments with a geometrically simple target and a new architecture of the microwave screening system capable of obtaining radar images of moving subjects. The system is based on the combined use of a video-tracker and a linear antenna array. Inverse synthetic aperture is formed by arbitrary motion of the target in the vicinity of the array. A video-based system tracks...
In this paper, a 24 GHz to 33 GHz frequency-modulated continuous-wave radar (FMCW) system is proposed. Beginning in the range of 2 GHz to 2.7 GHz, three separate multiplication stages bring the frequency band to between 24 GHz and 33 GHz. The system is integrated with a set of planar Yagi antennas. A single planar Yagi antenna is included on the transmit side, while four antennas in a steerable uniform...
In this paper the design and the implementation of a cavity antenna array in PCB technology for automotive radar applications is presented. The array consists of four cavity antennas fed by a microstrip-line feeding network and H-shaped coupling apertures in the ground plane. Simulation and measurement results show that the proposed structure is a suitable candidate for the integration in automotive...
This paper details the hardware operation, theoretical underpinnings and field validation tests of a portable, ultra-wideband, SIMO stepped frequency continuous wave sense through the wall radar system. The system is fully software defined and capable of transmitting and receiving a linearly stepped frequency waveform between 1GHz and 4GHz with reconfigurable frequency hop and sweep rates. Using such...
This work investigates the application of flares as a low-cost alternative for controlling the vertical beamwidth of a patch array antenna for S-band maritime radar applications. The use of flares reduces the number of array vertical elements needed to obtain the specified vertical beamwidth of the antenna and thus reducing the antenna cost. The optimal flare configuration has been found to be asymmetrical...
In this letter the design and simulation of an 0.43GHz P/UHF band microstrip patch antenna as single element, 2, 4, 8 & 16-element linear array using RT/duroid 6002 substrate was proposed. An inter-element spacing of 0.73λ for limited scan angle coverage. Wind profiling radar operating in Doppler beam swinging mode and spaced antenna drift technique mode needs to have a large aperture antenna...
We report our recent development in near rage radar systems and their applications to Non Destructive Inspection (NDI) for wooden buildings. We developed a radar system having 32 linearly aligned antenna elements operating at 10–20GHz. This system can acquire quite dense data on a wall. Then we discuss the possibility of 2-dimentional array system, based on the idea of sparse array. We demonstrated...
It is well known that waveforms can be designed to maximize the SNR of objects with specific desired features. In some cases, it may be desirable to tune a waveform for different features at different angles. A MIMO radar can transmit multiple waveforms across a large span of angles. It is possible to design a MIMO radar waveform transmitted from individual elements to achieve the desired waveform...
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