Method for designing transmitting directional diagram of MIMO system under motion platform

Abstract

The invention discloses a method for designing a transmitting directional diagram of an MIMO system under a motion platform, solves the problems that the airspace performance of the system is greatly reduced and detection and tracking tasks cannot be completed when the conventional MIMO transmitting directional diagram design technology is applied to the MIMO system under the motion platform, and belongs to the technical field of application of MIMO systems. The method is suitable for an MIMO system with a linear transmitting array, N array elements are arranged in the transmitting array, and the method comprises the steps: S1, compensating Doppler frequency shift caused by motion of a platform for transmitting signals bn(k) of transmitting antennas at K different moments; adopting different compensation forms for array elements located on the left side and the right side of the center of the array aperture according to different position relations with a target; S2, obtaining a covariance matrix W(l) according to bn(k); S3, obtaining the value of W(1) when l is equal to 0; S4, acquiring an array guide vector d([theta]) of the MIMO system under the motion platform; and S5, according to the W(0) and the d([theta]), obtaining an MIMO system emission directional diagram suitable for the motion condition of the platform.

Description

technical field [0001] The invention relates to a method for designing a transmission pattern of a MIMO system under a moving platform, and belongs to the application technical field of the MIMO system. Background technique [0002] MIMO (Multiple-Input Multiple-Output, Multiple Input-Multiple Output) system is an emerging electronic system. Compared with the traditional phased array system, it has higher system freedom and higher spatial resolution, which can achieve better search-detect-track performance. [0003] In existing MIMO system technologies, the influence of platform motion is rarely considered, that is, the Doppler effect is ignored. However, in practical applications, in many cases, MIMO systems are installed on moving platforms, and the Doppler effect caused by platform movement will degrade system performance, especially have a great impact on the airspace characteristics of the system, that is, the emission pattern, resulting in the formation of the emissio...

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Problems solved by technology

[0005] Aiming at the problem that the existing MIMO transmission pattern design technology is applied to the MIMO system under the moving platform, the airspace performance will be greatly reduced, and the detection and tracking tasks cannot be completed. The present invention provides a design method for the transmission pattern of the MIMO system under the moving platform.

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