Anti-jamming method for mimo radar based on nested array
An array and nesting technology, applied in the field of radar, can solve problems such as limited degrees of freedom, increased radar antennas, and impossibility of engineering implementation, achieving the effect of increasing degrees of freedom, improving performance, and being easy to implement in engineering
Active Publication Date: 2019-01-25
XIDIAN UNIV
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[0005] However, under the condition that the number of transmitting and receiving array elements is limited in this interference suppression method, the degree of freedom obtained by the virtual array constructed by uniform linear array is relatively limited. When the number of interference is greater than the product of the number of transmitting and receiving array elements, the existing centralized MIMO radar will not be able to accurately suppress interference
At the same time, when the accuracy of interference suppression is very high, the existing method is mainly to increase the aperture of the radar antenna. If the antenna array is continued to be a uniform linear array, a lot of antenna resources will be used, resulting in system failure. The increase in cost and complexity cannot be realized in engineering
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[0036] refer to figure 1 , the application scenario of the present invention includes a transmitting array of M array elements and a receiving array of N array elements. where the receiving array is a second-order nested array such as figure 1 As shown in (b), the second-order nested array consists of two uniform linear arrays cascaded: the first-level uniform linear array has N r1 array elements, array element spacing d r1 =1 / 2λ, λ is the wavelength of the transmitted signal, and the mth array element is located at md r1 , m=1,2,...,N r1 , the second uniform linear array has N r2 array elements, array element spacing d r2 =(N r1 +1)d r1 , the nth array element is located at n(N r1 +1)d r1 , n=1,2,...,N r2 . The transmit array is constructed with the first and last elements of the nested array as figure 1 As shown in (a), the array element number M=2.
[0037] refer to figure 2 , the implementation steps of the present invention are as follows:
[0038] Step 1:...
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The invention discloses a nested array-based MIMO radar anti-interference method, which mainly solves the problems of low resolution and poor interference suppression ability of the existing MIMO radar. The implementation steps are: 1) Obtain the target return signal; 2) Perform snapshot sampling, matched filtering and vectorization on the target return signal in sequence to obtain the vectorized received data y; 3) Estimate the covariance matrix of y and vectorize it , to obtain the observation vector z; 4) remove the repeated elements of z, and obtain the virtual difference array receiving data z1; 5) divide z1 into N1 sub-array receiving data, and obtain the received data covariance matrix Rss of rank recovery; 6) according to Rss Obtain beamformer weight vector W; 7) Perform beamforming according to W to enhance desired target information and suppress interference. The invention can effectively improve the resolution of the MIMO radar and the performance of suppressing interference, and can be used for suppressing interference.
Description
technical field [0001] The invention relates to the technical field of radar, in particular to a MIMO radar anti-jamming method, which can be used to suppress uninterested azimuth signals. Background technique [0002] The concept of MIMO technology first came from the field of wireless communication. It refers to the use of multiple transmitting antennas and multiple receiving antennas for transmission and reception. On the one hand, space diversity can improve channel fading; capacity. It has only been applied to radar systems in recent years. Once the concept of MIMO radar was proposed, the research on radar signal processing was introduced into a new field. It has great potential in anti-attenuation, improvement of resolution and anti-jamming. And exploring these potentials has far-reaching significance for improving target detection, parameter estimation, target tracking and recognition. [0003] According to the distance between the transmitting antenna and the recei...
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IPC IPC(8): G01S7/02G01S7/36
CPCG01S7/023G01S7/36
Inventor 张娟王洁张林让刘楠周宇
Owner XIDIAN UNIV