The Center for Collaborative Adaptive Sensing of the Atmosphere (CASA), a National Science Foundation Engineering Research Center, is creating a new type of weather observation system featuring networks of low-power, low-cost radars that adaptively and collaboratively collect high resolution data in the lowest 3 km of the atmosphere, a region which is under sampled by current technology. These ...

In the traditional transmitting beamforming radar system, the transmitting antennas send coherent waveforms which form a highly focused beam. In the multiple-input multipleoutput (MIMO) radar system, the transmitter sends noncoherent (possibly orthogonal) broad (possibly omnidirectional) waveforms. These waveforms can be extracted at the receiver by a matched filterbank. The extracted signals c...

The National Weather Radar Testbed (NWRT) phased array radar will not be operated in fixed volume coverage patterns. Instead, the phased array radar will attempt to simultaneously maximize the utility of several possible uses, such as 3D storm analysis, area surveillance and aircraft tracking. In order to do so, the phased array radar will employ adaptive scanning and intersperse meteorological...

An automated tracking algorithm for doppler radar storms is presented. Potential storms in Doppler radar images are hypothesized as regions of high water density (high intensity in the radar images) using a merge-and-split region growing algorithm. Potential storms are veriied by a relaxation labelling scheme that attempts to nds the best tracks based on spatio-temporal storm consistency. Tempo...

A millimeter wave (MMW) radar sensor is employed in our laboratory to detect human speech because it provides a new non-contact speech acquisition method that is suitable for various applications. However, the speech detected by the radar sensor is often degraded by combined noise. This paper proposes a new perceptual wavelet packet method that is able to enhance the speech acquired using a 94 ...

Although the information available to human operators can increase without obvious bound, human information processing capacities remain fixed. Finding and selecting the relevant information to display in this deluge of options imposes a burden on the user. We describe a domain-general system, Responsive Adaptive Display Anticipates Requests (RADAR), that learns to highlight the information a u...

Advances in active sensing are enabled by the ability to control new degrees of freedom and each new generation of radar platforms requires fundamental advances in radar signal processing [1],[2]. The advent of phased array radars and space-time adaptive processing have given radar designers the ability to make radars adaptable on receive [2]. Modern radars are increasingly being equipped with ...

In this work we review and extend the approach for radar imaging using small, wideband, adaptive arrays by using a ray-tracing algorithm to simulate non-homogeneous environments. This allows the rapid investigation of radar imaging in more realistic environments that might be encountered in practice. We have previously shown that such arrays can be effective for short range backscatter imaging ...

In this paper, we propose a multi-beam and multi-range (MBMR) radar with frequency modulated continuous wave (FMCW) waveform and digital beam forming (DBF) algorithm to cover a detection area of long range and narrow angle (150 m, ±10◦) as well as short range and wide angle (60 m, ±30◦) as a single 24 GHz sensor. The developed radar is highly integrated with multiple phased-array antennas, a tw...

As a result, many authors, e.g. [1-6], have proposed suboptimum methods that reduce the computational needs. First, we present a new framework that unifies all suboptimum methods we are aware of. Second, we present an original decomposition of the CSNR (Conditioned SNR) performance measure [7]. This decomposition can be used to understand the performance degradation that is specifically due to ...