A Coherent Source Direction Finding Method Based on Polarization Sensitive Array
A polarization-sensitive array and direction-finding technology, applied to direction finders using electromagnetic waves, direction/deviation to determine the direction of electromagnetic systems, etc., can solve the problem of incoherent source direction finding, incoherent source direction finding, and low estimation accuracy, etc. problems, to achieve excellent array expansion capabilities, improve global optimization capabilities, and high direction-finding accuracy
Active Publication Date: 2020-12-04
HARBIN ENG UNIV
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[0003] After searching the existing literature, Jian Li et al. used the ESPRIT method to estimate The DOA and polarization parameters of the source have the advantage of short calculation time, but this method is only suitable for angle estimation under independent source conditions and the estimation accuracy is not high
Yu B published "A New 2-D Parameter Estimation Method of NearField Sources Based on Polarization Sensitive Array" in "International Conference on Computer Science and Network Technology" (2013, 321-324), using the fourth-order cumulant to determine the orientation of the source The angle and polarization parameters are estimated, which effectively improves the direction finding accuracy, but this method cannot perform direction finding for coherent sources
[0004] The existing literature shows that there are relatively few studies on the direction finding of coherent sources with polarization-sensitive arrays, and none of them can directly measure the direction of coherent sources
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[0024] The invention provides a coherent source direction finding method based on polarization sensitive array, and the implementation method is further explained with reference to the attached drawings:
[0025] Step one, establish a direction finding model of a polarization sensitive array. Assume that the polarization sensitive array is composed of m pairs of biorthogonal dipoles, and the array element spacing is d. If there are far Q fully polarized narrow-band plane waves with wavelength λ incident on the array, the snapshot data received by the polarization sensitive array is y (k) = a (θ, γ, η) s (k)+n (k), where y (k) = [y 1 (k),y 2 (k),...,y 2M (k)] T Is a 2M×1-dimensional array snapshot data vector, where k represents snapshot times; A(θ,γ,η)＝[a 1 ,a 2 ,...,a Q ] is a 2M×Q dimensional polarization steering matrix, and the q-th polarization steering vector is among J is a complex unit, Said Kronecker product, q＝1,2,...,Q，θ＝[θ 1 ,θ 2 ,...,θ Q ] is the source azimuth ve...
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The invention provides a coherent signal source direction finding method based on a polarization sensitive array and belongs to the field of polarization sensitive array signal processing. The methodcomprises the following steps: 1) establishing a polarization sensitive array direction finding model; 2) initializing quantum pollens in a population, and determining a global optimum quantum pollen;3) for each quantum pollen, generating a new quantum pollen in probability; 4) mapping each quantum pollen into a pollen, and calculating fitness of each quantum pollen and selecting the quantum pollen; 5) generating new quantum pollens through a quantum differential evolution mechanism and carrying out selection; 6) judging whether reaching maximum iteration times, and if so, carrying out the step 7), or otherwise, letting t=t+1, and returning to the step 3) to continue iteration; and 7) outputting a maximum likelihood estimated value of the global optimum quantum pollen. The method can realize effective direction finding under the conditions of low signal to noise ratio, small number of snapshots and coherent signal sources.
Description
Technical field [0001] The invention provides a coherent source direction finding method under a polarization sensitive array, belonging to the field of signal processing of the polarization sensitive array. technical background [0002] Polarization-sensitive array signal processing is a new research hotspot in the field of international array signal processing in recent years. This kind of array can not only obtain the polarization information of space electromagnetic signals by using polarization-sensitive array elements, but also obtain the spatial information of space electromagnetic signals by using the spatial distribution of array elements. It makes full use of the inherent attributes and propagation information of signals, and helps to improve the comprehensive performance of electronic systems such as radar and reconnaissance. Compared with common array, polarization sensitive array has superior system performance, including strong anti-interference ability, robust dete...
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CPCG01S3/782
Inventor 高洪元陈梦晗刘丹丹李晋刁鸣李佳池鹏飞侯阳阳苏雪
Owner HARBIN ENG UNIV