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Arbitrary array interferometer direction finding method based on improved mixed baseline

An arbitrary array and interferometer technology, applied in the fields of radar and communication, which can solve the problems of lack of flexibility in baseline selection, the inability of regular array interferometer defuzzification methods to apply to arbitrary arrays, and the inability to make full use of array baselines.

Pending Publication Date: 2021-04-30
HANGZHOU DIANZI UNIV
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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention proposes an arbitrary array interferometer direction finding method based on an improved hybrid baseline, which solves the problem that the regular array interferometer defuzzification method in the prior art cannot be applied to any array, and the existing arbitrary array The interferometer defuzzification method has the problem of lack of flexibility in baseline selection and cannot make full use of the array baseline

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  • Arbitrary array interferometer direction finding method based on improved mixed baseline
  • Arbitrary array interferometer direction finding method based on improved mixed baseline
  • Arbitrary array interferometer direction finding method based on improved mixed baseline

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Embodiment 1

[0078] Pick a random arbitrary array of M=4. The 4 array elements are respectively centered on rectangular coordinates (0.5λ, 1.1λ), (-0.9λ, 0.8λ), (-1.1λ, -0.9λ), (1.1λ, -1.1λ) and centered at 0.01λ Randomly and evenly distributed in a circle with a radius of 1, the number of array elements is 1 in the first quadrant, and increases in the counterclockwise direction. Select baseline pairs (12,43), (14,23), (13,24), (12,23), (23,34), (34,41), (41,12) and name them BP1 , BP2...BP7. The target direction of arrival is set to (45°, 20°), and the signal-to-noise ratio is set to 5dB.

[0079] Its 500 Monte Carlo direction finding results are as follows image 3 As shown, the intersection of the dotted lines in the figure is the real angle, and the direction finding result indicated by the small cross is output by the improved direction function after the baseline pair (13,24) is deblurred. In order to remove the correlation between the direction finding results and the incoming w...

Embodiment 2

[0081] Select a uniform circular array with M=8, the radius of the 8-element circular array is set to 2.5λ, the array element 1 is located on the X axis, and the numbers of the other array elements increase counterclockwise. Choose 10 mixed baseline pairs (31,42), (42,53), (53,64), (64,75), (75,86), (86,17), (17,28), (28 ,31). The target direction of arrival is set to (45°, 20°), and the signal-to-noise ratio is swept from -14dB to -2dB.

[0082] Figure 5 The improved hybrid baseline method proposed for this method is published in "Research on Circular Array Interferometer Direction Finding" (Wang Qi. Research on Circular Array Interferometer Direction Finding[J]. Aerospace Electronic Countermeasures, 2009,25(5):33-35) Simulation results of the documented isometric baseline method. It can be seen that after introducing the normalized direction function method, even if the improved hybrid baseline method uses the same baseline pair as the equal-length baseline method, its d...

Embodiment 3

[0084] Select a 5-element semicircular array with M=5, the structure of the 5-element semicircular array is as follows Figure 6 shown. The direction of arrival is estimated using the stereo baseline method and the improved hybrid baseline method described in this method, respectively. The baseline pairs selected by the three-dimensional baseline method are (53,54), (42,23), (43,14), and this method uses the baseline pairs (24,53), (45,32), ( 12,43), (51,43), the baselines of these four baseline pairs cannot be used by the three-dimensional baseline method because of the same slope. Set the signal-to-noise ratio to -8dB, and the target incoming wave direction to (45°, 20°). Varying the signal wavelength λ sweeps the radius-to-wavelength ratio r / λ from 0.5 to 4.

[0085] The comparison results of the probability of successful defuzzification are as follows Figure 7 As shown, it can be seen that because the improved hybrid baseline uses more baseline pairs than the stereo b...

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Abstract

The invention discloses an arbitrary array interferometer direction finding method based on an improved mixed baseline. The method comprises the following steps of establishing a coordinate system on any array; selecting a plurality of baseline pairs from the array and calculating a fuzzy number range of each baseline measurement phase difference; taking the fuzzy number range as a boundary, generating a direction function group, deleting numbers with absolute values greater than 1, and normalizing the remaining numbers to obtain an improved direction function; and performing clustering analysis on the improved direction function group, and selecting the direction function group with the highest clustering degree for estimating the incoming wave direction. Compared with the prior art, the interferometer direction finding method provided by the invention is effective for any array. According to the improved hybrid baseline method provided by the invention, on one hand, selection of baseline pairs is very flexible, equal-length baselines and unequal-length baselines can be randomly selected, and the slope of the baselines is not required, so array baselines can be fully utilized; and on the other hand, a normalization means is adopted to improve a direction function for clustering, and the combination of the normalization means and the direction function helps to improve the success probability of interferometer phase ambiguity resolution.

Description

technical field [0001] The invention belongs to the technical field of radar and communication, and in particular relates to measuring the direction of arrival of an electromagnetic wave signal by using a phase interferometer method, in particular to an arbitrary array interferometer direction finding method based on an improved mixed baseline. Background technique [0002] Array direction finding is an important branch of array signal processing, which is widely used in civil and military fields such as communication, radar, seeker and sonar. The array used to realize the direction finding has various structures to choose from, generally the more popular ones are uniform linear array or uniform circular array. The former can use a fast direction-finding algorithm, and the latter can not only facilitate the selection of algorithms, but also leave space for the installation of other sensing devices. However, in some cases, due to space constraints, the regularity of the arra...

Claims

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Application Information

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IPC IPC(8): G01S3/14
CPCG01S3/143
Inventor 潘玉剑崔世豪胡星宇
Owner HANGZHOU DIANZI UNIV
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