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We consider the directions-of-arrival tracking of multiple narrowband waveforms impinging on a sonar array. As the captured measurements do not provide any information about the labeling of the objects, a challenge is to resolve the directions-of-arrival coming from closely-spaced objects. In order to prevent track coalescence, we pursue the recently introduced concept of Minimum Mean OSPA (MMOSPA)...
In this paper, the problem of estimating the directions of arrival (DOAs) for an unknown number of sound sources is addressed using a microphone array. In outdoor environments, the reverberation is not considered, so the pure delay mixture model is typically adopted here. Since the sound signal is usually wide-band and non-stationary, the Short Time Fourier Transform (STFT) is employed. However in...
In this paper, we look to address the problem of estimating the dynamic direction of arrival (DOA) of a narrowband signal impinging on a sensor array from the far field. The initial estimate is made using a Bayesian compressive sensing (BCS) framework and then tracked using a Bayesian compressed sensing Kalman filter (BCSKF). The BCS framework splits the angular region into N potential DOAs and enforces...
We developed a system for detecting the speech activity intervals of multiple speakers by combining multiple microphone arrays and human tracking technologies. We also proposed a method for estimating the face orientation of the detected speakers. The developed system was evaluated in two steps: individual utterances in different positions and orientations; and simultaneous dialogues by multiple speakers...
Advanced communication systems utilizing multiple transmitting antennas working in a same frequency, such as phased array antennas or MIMO (Multi-Input Multi-Output) antennas, recently receive more and more research attentions. One of technical issues, which certainly need to take into account, is the electromagnetic compatibility. In particular, the evaluation of Specific Absorption Rate (SAR), in...
Electrical mismatch between modules in a PV array due to partial shading causes energy losses beyond the shaded module. This occurs because unshaded modules are forced to operate away from their maximum power point in order to compensate for the shading. Here we present an irradiance estimation algorithm for use in a mismatch mitigation system. Irradiance is estimated using measurements of module...
Recently, microwave remote sensing has been used for observation of the global environment extensively. There are many techniques in the microwave remote sensing. Among them, SAR (Synthetic Aperture Radar) Tomography is one of the emerging technique that can realize three dimensional imaging, by using multiple flight paths. The data pixels in each SAR image obtained at the slightly different paths...
Direction-of-arrival (DOA) is a research direction in array signal processing. This paper estimates the DOA for Multiple-Input Multiple-Output (MIMO) radar system. The algorithms of multiple signal classification and approximated maximum likelihood (MUSIC-AML) based on linear array are deduced. The number of target sources is also valued in this paper. The results show the feasibility and validity...
This paper proposes a novel ESPRIT(Estimation of Signal Parameters via Rotational Invariance Techniques)-like algorithm for DOD (Direction of Departure) and DOA (Direction of Arrival) estimation in bistatic MIMO (Multiple Input Multiple Output) radar in order to reduce computational burden of conventional methods based on the fourth-order cumulant. Firstly, the fourth-order cumulant matrix of received...
Based on the Multitask Bayesian Compressive Sensing (MT-BCS) framework, a novel DOA estimation approach for planar array is proposed in this paper. Different from the traditional CS-based DOA model, where the spatial observation is characterized in one large scale matrix, to reduce the complexity, a separable observation structure is proposed, which separates the joint spatial observation into two...
This paper presents a high-resolution, area- and power-efficient successive approximate register (SAR) analog-to-digital converter (ADC) for high precision nerve recording. The design features a new “half-split” feedback digital-to-analog converter (DAC) capacitor array with integrated digital calibrations, which allow automatic estimation and calibration of capacitor mismatches. As a result, the...
Recent work has demonstrated the superiority of compressive sensing (CS) for the sound source localization. Using the microphone array, the direction-of-arrival (DOA) estimation is obtained by using the wideband extensions of CS technique. For tracking moving wideband sound sources, a method combined CS with particle filter (PF) algorithm is proposed. Each source is approximated by a set of particles...
The MUSIC algorithm is researched in the planar antenna array. The conventional direction of arrival (DOA) estimation method in the planar array antennas uses the technology of beam scanning. It needs a lot of array element. To the finite conformal array DOA estimation, the resolution ratio will be affected by the Rayleigh limit. While, the MUSIC algorithm can fully utilize the orthogonality of noise...
The small degrees of freedom (DOFs) and low SNR of incoming signal lead to direction of arrival (DOA) estimation performance degradation. A spacetime signal processing method for DOA estimation is presented. This method takes advantage of the spatial and temporal statistics of the incoming signal, expanding the dimensions of covariance matrix by increasing the time delay taps which can reduces the...
GRCRT(Generalized Robust Chinese Remainder Theorem) allows to reconstruct multiple numbers when all the moduli have a common factor and all residue sets have errors. In this paper, we propose a new approach based on GRCRT to joint estimation of chirp rates, initial frequencies and DOAs (direction of arrivals) for multiple LFM(linear frequency modulation) signals with sub-Nyquist spatial-temporal sampling...
This paper investigates localization of sound sources in a real environment using a tablet device. For the localization, we use build-in sensors on a tablet device and additionally mount a cover with a microphone array. Because of the flat shape and limited sensor performance, the localization has mainly the following three issues; 1) the flat microphone array allows only azimuth estimation but elevation...
The spatial localization of passive UHF (ultra-high frequency) radio-frequency identification (RFID) tags is an emerging technology that has reached a high level of interest in industry and research in the last few years. Most solutions are based on classical receive beamforming techniques, like the angle-of-arrival estimation, that are prone to multipath and deliver low localization accuracies. Therefore,...
A low complexity frequency domain bearing estimation technique is described in this paper. The technique presented makes use of a pair of orthogonal dipoles or differential sensors along with an omni directional pressure sensor for the bearing estimation. The paper describes the theory from first principles with an overview of the simulation results and also covers the proof of concept experimental...
Millimeter wave (mmWave) technology is widely used for automotive radar applications, like adaptive cruise control and obstacle detection. Unlike conventional radar waveforms which are usually propriety, this paper explores the use of a consumer wireless local area network (WLAN) waveform in the 60GHz unlicensed mmWave band for automotive radar applications. In particular, this paper develops a joint...
Using an RFID reader to estimate angle-of-arrival (AoA) of a passive UHF RFID tag backscatter signal has been extensively studied; however using an RFID reader to estimate AoA information of multiple passive UHF RFID tag backscatter signals simultaneously is scant in literatures. This work presents experimental results of simultaneous AoA estimation of two commercial passive UHF RFID tags using a...
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