Direction of Arrival Estimation Using Quadratic Time Frequency Distributions
نویسندگان
چکیده
The paper introduces a novel time-frequency linearly constrained minimum variance (LCMV), also known as Capon method, for the direction of arrival (DOA) estimation of nonstationary signals impinging on a multisensor array receiver. The results are compared with the conventional Capon method of DOA estimation technique. In Capon method, the weights are chosen to minimize the weighted array power output subject to the unity gain constraint in the desired look direction. Time-frequency distributions localize the signal power in the time-frequency domain and as such enhance effective Signal to noise ratio (SNR), leading to improved DOA estimates. Time-frequency distributions result in signal separation in the time-frequancy domain and hence fewer signals can be selected for processing. Therefore, the interference signals are eliminated by selecting proper timefrequency regions. This paper focuses on the class of frequency modulated (FM) signals because of their clear representation in time-frequency plane.
منابع مشابه
DOA Estimation of Nonstationary Signals
In this Chapter, we discuss the direction finding problem of sources emitting or inducing nonstationary signals. The focus is on signals which are uniquely characterized by their instantaneous frequencies. Recognizing the quadratic time-frequency distributions as an effective tool to localize signal power in the time-frequency domain, we present nonstationary array processing in the context of ...
متن کاملImplementation of the direction of arrival estimation algorithms by means of GPU-parallel processing in the Kuda environment (Research Article)
Direction-of-arrival (DOA) estimation of audio signals is critical in different areas, including electronic war, sonar, etc. The beamforming methods like Minimum Variance Distortionless Response (MVDR), Delay-and-Sum (DAS), and subspace-based Multiple Signal Classification (MUSIC) are the most known DOA estimation techniques. The mentioned methods have high computational complexity. Hence using...
متن کاملSpatial Polarimetric Time-Frequency Distributions and Applications to Direction-of-Arrival Estimation
Time-frequency distributions (TFDs) have evolved to be a powerful technique for nonstationary signal analysis and synthesis. With the use of a multi-sensor array, spatial time-frequency distributions (STFDs) have been developed and successfully applied to high-resolution direction-of-arrival (DOA) estimation and blind recovery of the source waveforms. In this paper, the polarimetric dimension i...
متن کاملWindowing Effects of Short Time Fourier Transform on Wideband Array Signal Processing Using Maximum Likelihood Estimation
During the last two decades, Maximum Likelihood estimation (ML) has been used to determine Direction Of Arrival (DOA) and signals propagated by the sources, using narrowband array signals. The algorithm fails in the case of wideband signals. As an attempt by the present study to overcome the problem, the array outputs are transformed into narrowband frequency bins, using short time Fourier tran...
متن کاملWindowing Effects of Short Time Fourier Transform on Wideband Array Signal Processing Using Maximum Likelihood Estimation
During the last two decades, Maximum Likelihood estimation (ML) has been used to determine Direction Of Arrival (DOA) and signals propagated by the sources, using narrowband array signals. The algorithm fails in the case of wideband signals. As an attempt by the present study to overcome the problem, the array outputs are transformed into narrowband frequency bins, using short time Fourier tran...
متن کامل