Anti-active jamming method for mimo radar based on transmit beam domain

Abstract

The invention discloses a MIMO radar anti-active interference method based on the transmit beam domain. It mainly solves the problems of poor performance of active interference suppression and large amount of calculation in early methods. The implementation steps are: 1) Using the beam domain weight matrix V, convert the M orthogonal signals S emitted by the transmitting array into K orthogonal beam signals Φ, and use Φ to irradiate a target and J active interferences in the far field, Obtain the received signal; 2) Perform matched filtering and vectorization on the received signal in turn to obtain the vectorized received data X(l); 3) Perform beamforming on X(l) to obtain the constraints of the transmit beam domain matrix; 4) According to the constraint conditions, the objective function that minimizes the difference between the expected emission pattern and the actual emission pattern is obtained; 5) Solve the objective function. The method of the invention can effectively suppress active interference and can be used in centralized MIMO radars.

Description

technical field [0001] The invention relates to the field of radar technology, in particular to MIMO radar anti-interference technology, which can be used for the suppression of active interference. Background technique [0002] Multiple-input and multiple-output MIMO radar has great potential in anti-fading, improving resolution and anti-jamming. Researching and exploring these potentials has far-reaching significance for improving target detection, parameter estimation, and target tracking and identification. According to the distance between the transmitting antenna and the receiving antenna, MIMO radar can be divided into two types: distributed MIMO radar and centralized MIMO radar. The transmitting and receiving antennas of distributed MIMO radar are far apart, and they can observe the target from different perspectives. The centralized MIMO radar transmit and receive antennas are relatively close to each other, and the viewing angles of each antenna to the target are a...

AI Technical Summary

Problems solved by technology

However, this method is mainly used for phased array radar. Since the active interference signal received by MIMO radar only contains the information of the receiving channel, but not the information of the transmitting channel, it cannot effectively use the advantages of MIMO radar waveform diversity, resulting in its suppression. Active interference doesn't work well

At the same time, most of the adaptive beamforming of this method is based on the radar antenna array at the element level. With the popularization and use of large radar arrays, the beamforming technology at the element level has a huge amount of computation and high engineering implementation costs.

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