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Broadband signal direction of arrival (DOA) estimation method based on threshold detection

A direction of arrival estimation and broadband signal technology, applied in space transmit diversity, diversity/multi-antenna systems, etc., can solve problems such as unsatisfactory results, poor DOA estimation effect, and inability to distinguish coherent sources, etc., to reduce hardware costs, Small amount of calculation, the effect of reducing the amount of calculation

Inactive Publication Date: 2011-04-13
HARBIN ENG UNIV
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Problems solved by technology

The ISM method is simple and effective when the SNR is high, but when the SNR is low, the DOA estimation effect in some frequency bands is very poor, resulting in poor overall performance, so this type of algorithm often cannot get satisfactory results. and cannot distinguish coherent sources

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  • Broadband signal direction of arrival (DOA) estimation method based on threshold detection
  • Broadband signal direction of arrival (DOA) estimation method based on threshold detection
  • Broadband signal direction of arrival (DOA) estimation method based on threshold detection

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Embodiment Construction

[0024] The patent of the present invention provides a method for estimating the direction of arrival of a broadband signal. For incoherent signals, a robust angle estimation can be obtained; for coherent signals, the result obtained by the method can be used as the estimated angle of focusing algorithms. Threshold detection and spectral weighting in the method flow are the core of the present invention. The present invention will be described in further detail below with reference to the drawings and embodiments:

[0025] figure 1 Is the flow chart of the method of the present invention, such as figure 1 As shown, the method includes the following steps:

[0026] Step 11: Decompose the broadband data into non-overlapping narrowband components in the frequency domain. The antenna array is a uniform linear array. Each element is an omnidirectional antenna. The number of elements is M, and the distance between the elements is half wavelength. Assume that N far-field broadband signal...

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Abstract

The invention provides a broadband signal direction of arrival (DOA) estimation method based on threshold detection. The method comprises the following steps: by means of energy threshold detection, abandoning subbands the energy of which is smaller than the threshold, and carrying out narrow-band spatial spectrum treatment on subbands the energy of which is larger than the threshold; and then solving DOA angles by adopting a spectrum weighing method. By means of the method, accurate estimation results can be obtained for incoherent signals; and in terms of coherent signals, the estimation results obtained by the method is taken as estimated angles for a Coherent Signal-Subspace Method (CSM), and then accurate DOA information is solved by utilizing a focus transformation method. Compared with the traditional method, the method has the advantages that the theory is simple, the estimation is accurate, the computation amount is less, and the hardware cost can be greatly lowered in practical application.

Description

Technical field [0001] The invention relates to a method for estimating the direction of arrival, in particular to a method for estimating the direction of arrival of signals received by a wireless communication system. Background technique [0002] At present, the spatial spectrum estimation algorithm for narrowband signals is relatively mature. With the development of high-precision technology of communication signal processing, the DOA estimation algorithm for wideband signals has become a research hotspot at home and abroad. Compared with narrowband signals, wideband signals have the characteristics of strong anti-interference ability, high resolution, large amount of information, and weak correlation with background noise. It is conducive to target detection, accurate parameter estimation, and target feature extraction. It has been used in radar, sonar, Communication, seismic exploration, medical imaging and many other fields have been widely used, especially in radar system...

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Application Information

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IPC IPC(8): H04B7/08
Inventor 张曙老世帅
Owner HARBIN ENG UNIV
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