Zhaonian Zhang

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A micro-Doppler active acoustic sensing system is described. We report its use in acquiring gait signatures of humans and four-legged animals in indoor and outdoor environments. Signals from an accelerometer attached to the leg support the interpretation of the components in the measured micro-Doppler signature. The acoustic micro-Doppler system described(More)
Active acoustic scene analysis is a promising approach to distributed persistent surveillance in sensor networks. We report on the design of bandpass sampling technique for an acoustic micro-Doppler sonar to reduce the data rate to as low as 85 kbps. We then explore the use of Gaussian mixture models for human identification. We compare the classification(More)
In this paper, we report on the use of a microphone array and enclosure in the Hopkins Acoustic Surveillance Unit (HASU) for bearing estimation and tracking of a moving vehicle at a close range. We use correlation based algorithms and we report bearing estimation results from moving vehicles at various constant velocities. The estimation results are in good(More)
Impulse or ultra wideband (UWB) radio is a wireless communications method, providing high bandwidth for short range communication. Address event representation (AER) is a communications protocol for conveying information in terms of events and is widely used in neuromorphic systems. Combining the two techniques, we present a method for wirelessly sending(More)
The three-dimensional (3D) integration of silicon on insulator (SOI) wafers has provided us with a tremendous opportunity for ultra-high density, high performance and low-power integrated circuits. We present in this paper an ultra wideband transmitter fabricated in a fully depleted 3D SOI technology. It operates below 960 MHz with small ominidirectional(More)