Coherent and incoherent mixed target DOA estimation method based on coprime MIMO array

A technology of mixed targets and arrays, which is applied in the field of signal processing, can solve problems such as the inability to achieve DOA estimation and false targets of DOA estimation results, and achieve the effect of improving flexibility and meeting the needs of DOA estimation

Active Publication Date: 2018-01-12
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0003] However, the above-mentioned DOA estimation method based on the "difference synergy array" uses the equivalent single-snapshot signal derived from the correlation elements after solving the correlation of the actual multi-snapshot signal. If there are multiple coherent targets, solving the correlation will produce inter-target crossover , resulting in false targets in the DOA estimation results, therefore, the above method is not suitable for the presence of coherent targets, that is, the DOA estimation of coherent targets cannot be achieved

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  • Coherent and incoherent mixed target DOA estimation method based on coprime MIMO array
  • Coherent and incoherent mixed target DOA estimation method based on coprime MIMO array
  • Coherent and incoherent mixed target DOA estimation method based on coprime MIMO array

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Embodiment 1

[0036] see figure 1 , a coherent and non-coherent mixed target DOA estimation method based on a coprime MIMO array, including the following steps:

[0037] (1) Select an area, arrange N transmitting array elements and 2M-1 receiving array elements according to the coprime layout, so as to form a coprime MIMO array, where Mt ={Mnd; n=0,1,…,N-1}, the position of 2M-1 receiving antennas is P r ={Nmd; m=1,2,...,2M-1}, d is the basic distance of half wavelength;

[0038] (2) N transmitting array elements sequentially transmit electromagnetic wave signals with frequency c / 2d for target detection. If the target is detected, it will return after scattering, and the returned echo signal is received by 2M-1 receiving array elements at the same time, and ( 2M-1)×N echo signals of the transceiver channels, each echo signal of each channel is sampled K times to generate K snapshot data;

[0039] (3) Add the positions of the N transmitting array elements to the positions of 2M-1 receiving...

Embodiment 2

[0056] see Figure 2-Figure 4 ; This embodiment adopts MATLAB simulation software to carry out simulation, sets the measured coherent and non-coherent hybrid target in the far field, uses the coprime MIMO array of M=3 and N=4, sets the number of snapshots to be 2000, and the signal-to-noise ratio is 10dB, the basic interval d of half wavelength is 1.

[0057] (1) Arrange N=4 transmitting array elements and 2M-1=5 receiving array elements according to the coprime layout to form a coprime MIMO array, and the position of the 4 transmitting array elements is P t ={0,3,6,9}, the positions of the 5 receiving antennas are P r ={4,8,12,16,20}, such as figure 2 shown.

[0058] (2) Four transmitting array elements sequentially transmit electromagnetic wave signals with a frequency of c / 2d=150MHz, and the echo signals after reaching the target are received by five receiving array elements at the same time, thus obtaining echo signals of 5×4 transceiver channels , the echo signal of ...

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Abstract

The invention discloses a coherent and incoherent mixed target DOA estimation method based on a coprime MIMO array. Compared with the actual sparse coprime MIMO array, the DOA estimation method constructs an evenly and densely distributed virtual MIMO array, the array contains more numbers of transmitting array elements and receiving array elements, DOA estimation is carried out using obtained equivalent multiple snapshot data of the virtual MIMO array, the problem of the coherent and incoherent mixed target DOA estimation is solved, and the limit of the actual array number of the coprime MIMOarray to the maximum number of distinguishable targets can be broken through. The virtual MIMO array with different transmitting and receiving array elements can also be obtained, according to the number of different maximum distinguishable coherent targets and the total number of maximum distinguishable coherent and incoherent targets, the demand of the DOA estimation for the coherent and incoherent targets is met through flexibly selecting the number of transmitting and receiving array elements of the virtual MIMO array, and the flexibility of the DOA estimation is improved.

Description

technical field [0001] The invention relates to a signal processing method, in particular to a coherent and non-coherent mixed target DOA estimation method based on a coprime MIMO array. Background technique [0002] Based on the space-time sampling of the sensor array, the direction of arrival (DOA) estimation can determine the azimuth position information of multiple space targets, has high resolution, and is widely used in communication, radar, sonar, seismic sensing and other fields. For an all-receiving array with adjacent elements evenly spaced at half-wavelength spacing, the maximum number of resolvable incoherent targets is limited by the number of actual elements. In order to break through the limitation of the number of resolutions, sparse receiving arrays whose distance between adjacent elements is greater than half a wavelength are used to design DOA estimation methods for incoherent targets. Commonly used sparse receiving arrays include minimum redundancy arrays...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/42
Inventor 贾勇干娜贺成佳钟晓玲郭勇张喜娟
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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