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Signal source DOA estimation method based on space-time structure for removing pre-delay module

A technology of delay module and signal source, which is applied in direction finders using radio waves, radio wave direction/deviation determination systems, etc., and can solve problems such as loss of signal gain, low resolution, and complex processing processes

Active Publication Date: 2018-08-17
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0030] It can be seen from the above that when the incoherent signal subspace method based on the space-frequency structure is used for signal source DOA estimation, it is necessary to perform sub-band processing on the signal and estimate the number of signal sources, and each sub-band needs to The eigendecomposition of the covariance matrix leads to complex processing and a large amount of calculation; and the FFT processing of the signal will lose the signal gain; under the condition of less data or low signal-to-noise ratio, the resolution of this method is also low. high

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  • Signal source DOA estimation method based on space-time structure for removing pre-delay module
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  • Signal source DOA estimation method based on space-time structure for removing pre-delay module

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[0089] Consider a 16-element uniform linear array, the signal source contains two broadband signals, the signal bandwidths are 400MHz and 200MHz respectively, the incident directions are -10° and 12° respectively, and the center frequency is 1000MHz, the signal is band-pass sampled, the sampling frequency The minimum wavelength is 800MHz, and the element spacing is half of the minimum wavelength; for the space-time structure of the pre-delay processing, it is assumed that the number of taps in the time domain is 14, and the number of frequency selection points is 5; for the space-frequency structure, it is assumed that the number of FFT points is 400; The possible interval of the signal source direction is Θ=[-20°, 20°].

[0090] figure 2 It is the DOA estimation diagram drawn when the number of signal snapshots is 2000 and the signal-to-noise ratio is 5dB. It can be seen that the resolution of the method proposed in the present invention is Higher than the signal source DOA...

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Abstract

The invention discloses a signal source DOA estimation method based on a space-time structure for removing a pre-delay module, and belongs to the technical field of self-adaptive array signal processing. According to the method, based on the space-time processing structure for removing the pre-delay module, a weight within an angle search range is solved by utilizing a linear constraint minimum variance criterion, then a spectral function that P(Theta) is equal to a absolute value of WHRW is drawn out, spectral peak search is conducted on the spectral function, and the DOA estimation of signalsources is obtained according to the peak position of the spectral function. According to the method, the DOA estimation of the signal sources is achieved by using the space-time structure for pre-delay removal processing without decomposing a wideband signal into narrowband signals or estimating the number of the signal sources. Thus, compared with a signal source DOA estimation algorithm basedon a space-frequency structure, the DOA estimation method has the advantages that the calculation process is relatively simple, the calculation amount is greatly reduced, and under the condition of low signal data amount and low signal-to-noise ratio, the resolution is increased.

Description

technical field [0001] The invention relates to the technical field of adaptive array signal processing, in particular to a signal source DOA (Direction Of Arrival) estimation method based on a space-time de-delay structure. Background technique [0002] The existing DOA estimation algorithms for incoherent broadband signals are mainly incoherent signal-subspace method (ISM, incoherent signal-subspace method). Perform narrowband signal subspace processing on each frequency band, so as to obtain the angle estimation of each subband (each frequency point) signal, and then obtain the final result by combining the estimated values ​​of DOA of each subband signal. Among them, the incoherent signal subspace method based on the space-frequency structure is a commonly used signal source DOA estimation method in practice. However, in practical applications, when processing more data, the signal source DOA estimation algorithm based on space-frequency structure is complex to process ...

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Application Information

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IPC IPC(8): G01S3/14
CPCG01S3/14
Inventor 谢菊兰胡君丽陈敲月谢明
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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