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A grating lobe suppression method based on non-uniform nested mimo radar

A non-uniform and nested technology, applied in the field of radar, can solve the problems of reduced gain and unreasonable array, and achieve the effect of stable grating lobe suppression, effective algorithm and cost saving.

Active Publication Date: 2021-08-13
XIDIAN UNIV
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  • Claims
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Problems solved by technology

[0004] But the gain that can be obtained will be greatly reduced, and if the array is not reasonable, it will also lead to high side lobe levels

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  • A grating lobe suppression method based on non-uniform nested mimo radar
  • A grating lobe suppression method based on non-uniform nested mimo radar
  • A grating lobe suppression method based on non-uniform nested mimo radar

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Embodiment 1

[0066] A nested array is a large array that realizes the expansion of the virtual aperture and the increase in the number of array elements through nesting of transceivers. Its physical structure is relatively simple, it has a closed-form solution, and the expanded degrees of freedom can be calculated, so its application prospects are broad. . The MIMO (Multiple-Input Multiple-Output) radar array design mainly studies the uniform array. Generally, the large-spaced transmitting array and the small-spaced receiving array are used to jointly generate effective virtual array elements and increase the number of array elements. And if the non-uniform array is used reasonably, there may be better results. Therefore, combining the nested array model with the MIMO radar system can show the advantages of both, and can further improve the radar performance.

[0067] Based on the above theory, this embodiment provides a grating lobe suppression method based on non-uniform nested MIMO rada...

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Abstract

The invention discloses a grating lobe suppression method based on non-uniform nested MIMO radar, which includes: establishing a non-uniform nested MIMO radar system model, and obtaining a joint normalized antenna pattern of transmitting and receiving of the model according to echo signals of the model , the expression of the normalized antenna pattern of the model is subjected to a series of processing such as Possion summation, stationary phase method, Taylor expansion, Fresnel integral, etc., and the array element spacing function of the equivalent array of the model is derived. The position of the equivalent array element is deduced at intervals and transformed into an optimization problem, and the actual position of the transceiver array element of the model is solved by an improved genetic algorithm. The technical solution of the present invention combines the non-uniform nested array and the MIMO radar, so that the advantages of both are displayed, better grating lobe suppression effect is obtained, the radar performance is further improved and the cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to a grating lobe suppression method based on non-uniform nested MIMO radar. Background technique [0002] With the emergence of stealth, high-speed targets, etc., the radar pattern is required to have a narrower beam, and at the same time, it cannot produce grating lobes and high side lobes. In order to meet the requirements and consider the cost issue, fewer array elements can be used to arrange them in the largest possible aperture, which can reduce the cost while ensuring that the beam is sufficiently narrow. [0003] For a conventional uniform array, when the interval between array elements is greater than half of the wavelength, false peaks, namely grating lobes, will appear in the receiving pattern of the antenna. In order to control the cost without generating grating lobes, it is not a good choice to arrange arrays at equal intervals. If the positions of the arr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 李军常峻青薛玉喜亢海龙张玉洪卫雨松尉泽华
Owner XIDIAN UNIV