Abstract
In this letter, we address the problem of wideband sources localization in the near field of the sensor array. It is shown that the spatial sampling rate can be considered as a function of temporal frequency so that wideband sources can be represented in the spatial frequency domain. A computationally efficient localization method is then developed based on the Toeplitz matrices constructed from the frequency-dependent cross-correlation between sensors. This allows us to resolve near field sources with quite a few numbers of sensors. Indeed, the sources can be located with fewer sensors. Finally, the simulation results are presented to validate the performance of the proposed method.
Highlights
The objective of our letter is to propose a novel scheme to simultaneously estimating the DOA and sensor location using fewer sensors, possibly less than the number of wideband sources in the near-field
Like the conventional methods for wideband sources[24-26], the received data is transformed to the frequency domain firstly, and each frequency bin can be represented by the narrowband model
The simulation results show that our proposed technique can improve greatly the detection and estimation capability for wideband near field sources
Summary
The objective of our letter is to propose a novel scheme to simultaneously estimating the DOA and sensor location using fewer sensors, possibly less than the number of wideband sources in the near-field. Like the conventional methods for wideband sources[24-26], the received data is transformed to the frequency domain firstly, and each frequency bin can be represented by the narrowband model. The Toeplitz matrices including the angle and the range information can be obtained by the frequency-dependent crosscorrelation between sensors[27]. We can employ the traditional subspace-based methods to estimate the angle and the range of wideband near field sources. The simulation results show that our proposed technique can improve greatly the detection and estimation capability for wideband near field sources
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