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Anti-jamming method of FDA-MIMO radar based on frequency stepping quantity control

A technology of frequency stepping and radar, which is applied in the field of communication, can solve problems such as the inability to obtain MIMO radar transmission waveforms, and lack of universality

Active Publication Date: 2021-02-09
XIDIAN UNIV
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Problems solved by technology

However, in practical applications: 1) The patent assumes that completely orthogonal waveforms are transmitted, but it is impossible to obtain MIMO radar transmission waveforms that are orthogonal at any time delay and any Doppler, so this method is not universal in practice ; 2) Using adaptive beamforming to suppress main lobe deceptive interference requires sufficient training samples to construct a covariance matrix, and the problem of sample selection has not yet been resolved

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  • Anti-jamming method of FDA-MIMO radar based on frequency stepping quantity control
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  • Anti-jamming method of FDA-MIMO radar based on frequency stepping quantity control

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[0044]The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0045]Reference attachedfigure 1 The specific implementation steps of the present invention are as follows:

[0046]Step 1. In a co-located FDA-MIMO radar with M transmitting antennas and N receiving antennas, design the frequency step Δf at the transmitting end of the FDA-MIMO radar, as follows:

[0047](1a) According to the following formula, construct an expression for the frequency step of the FDA-MIMO radar transmitter:

[0048]Δf=fr(z+v)

[0049]Among them, z represents any positive integer part, v represents the decimal part;

[0050](1b) Follow the steps below to get the decimal partAmong them, i represents any positive integer, and i

[0051](1b1) gives the non-adaptive weight vector pointing to the zero degree direction:

[0052]w0=[1,1,…,1]T

[0053]Among them, T represents th...

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Abstract

The invention provides an anti-jamming method of an FDA-MIMO radar based on frequency stepping quantity control, and mainly solves the problem that an existing radar system is difficult to suppress deceptive jamming from a main lobe direction. The method comprises the implementation steps of 1, designing a frequency stepping quantity of a transmitting end of the FDA-MIMO radar; 2, setting parameters according to the frequency stepping quantity, and constructing an equivalent emission steering vector of a real target and an equivalent emission steering vector of a qth false target; 3, performing compensation operation on the vector constructed in the previous step by utilizing the equivalent emission distance compensation vector; and 4, according to the compensated equivalent emission steering vector of the real target of the radar, obtaining an output signal after non-adaptive beam forming. According to the invention, joint transmitting-receiving two-dimensional zero setting is performed through a non-adaptive beam forming method, so that the false target is enabled to be equivalently located at the zero point of the beam forming directional diagram corresponding to the real target, and deceptive jamming of the main lobe can be effectively suppressed.

Description

Technical field[0001]The invention belongs to the field of communication technology, relates to digital information transmission, and specifically is an anti-jamming method based on frequency step control for frequency diversity array FDA-MIMO (Frequency Diverse Array-Multiple-Input and Multiple-Output) radar . It can be used to suppress deceptive interference from the main lobe of the radar antenna and improve the survivability of the radar in electronic warfare.Background technique[0002]Array radars are facing increasingly complex electromagnetic environments in space, and are susceptible to strong interference and strong clutter, which severely limits the information acquisition capabilities of the radar system. Among them, deceptive jamming radiates electromagnetic waves similar to the echoes of real targets to induce radars to mistakenly regard false targets as real targets, causing the loss of real targets, occupation of radar resources and abnormal air conditions, etc., makin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36
CPCG01S7/36Y02D30/70
Inventor 兰岚廖桂生许京伟朱圣棋张俊
Owner XIDIAN UNIV
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