Method for adaptively resisting spatial distribution interference based on logarithmic frequency offset frequency diversity array

A frequency diversity array, space distribution technology, applied in the field of target tracking, the suppression of space distribution interference, can solve the problem of radar anti-jamming performance decline and so on

Inactive Publication Date: 2018-10-09
XIDIAN UNIV
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Problems solved by technology

Adaptive beamforming using the simplest frequency diversity array model can form a suppression null at the interference position, but the pattern formed under the simplest model has distance periodicity, so that when the radar

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  • Method for adaptively resisting spatial distribution interference based on logarithmic frequency offset frequency diversity array
  • Method for adaptively resisting spatial distribution interference based on logarithmic frequency offset frequency diversity array
  • Method for adaptively resisting spatial distribution interference based on logarithmic frequency offset frequency diversity array

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Embodiment Construction

[0028] Below in conjunction with accompanying drawing, invention will be further described:

[0029] refer to figure 1 , the implementation steps of the present invention are as follows:

[0030] Step 1, using the logarithmic frequency offset frequency diversity array to transmit orthogonal signals.

[0031] 1a) Assume a uniform linear array with N array elements, and the array element spacing is d, and construct a logarithmic frequency offset frequency diversity array, such as figure 2 shown;

[0032] 1b) Take the first array element as the reference array element, and set the carrier frequency of the transmitted signal of the reference array element as the reference frequency f 0 , set the transmit carrier frequency f of the nth array element n = f 0 +Δf'(n), such as image 3 As shown, where Δf'(n) is the carrier frequency offset between the nth array element and the reference array element, Δf'(n)=lg(n)Δf, Δf is the reference frequency offset, which is a constant, ...

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Abstract

The invention discloses a method for adaptively resisting spatial distribution interference based on a logarithmic frequency offset frequency diversity array, and mainly solves a problem that the periodic spectral peak of a conventional fixed frequency offset frequency diversity array in a distance dimension causes the decrease of the anti-interference performance. The implementation scheme of theinvention is that the method comprises the steps: constructing the logarithmic frequency offset frequency diversity array, and emitting a signal through the logarithmic frequency offset frequency diversity array; carrying out the separation and rearrangement of the signal and extracting a receiving end normalization guide vector; obtaining an adaptive wave beam forming weight vector according tothe normalization guide vector and a received data autocorrelation matrix through a linear minimum constraint variance criterion; finally carrying out the beam forming through the adaptive wave beam forming weight vector, wherein an obtained directional diagram guarantees the single mapping of the beam spectral peak and a target position while achieving the resisting of the spatial distribution interference. The method can guarantee the single mapping of the beam spectral peak and the target position while achieving the resisting of the spatial distribution interference, and can be used for target tracking.

Description

technical field [0001] The invention belongs to the technical field of radar anti-interference, and further relates to a suppression method for spatially distributed interference, which can be used for target tracking. Background technique [0002] As an important part of electronic attack, electronic jamming has developed rapidly in recent years and has various forms. With the development of unmanned aerial vehicles, airships, etc., small jammers using them as carriers are widely used, and the distributed interference formed by a large number of small jammers in space poses a serious threat to the normal operation of radar. It is urgent to find ways to effectively counteract spatially distributed interference. [0003] Frequency diversity array is a relatively new type of array system. The simplest model is to introduce a fixed frequency offset between the transmitting carrier frequencies of adjacent array elements on the basis of a linear array with uniform distribution o...

Claims

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Application Information

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IPC IPC(8): G01S7/36G01S7/41G01S13/72
CPCG01S7/36G01S7/41G01S13/72
Inventor 陶海红柳阳赵朗旭鲍俊竹张艳艳
Owner XIDIAN UNIV
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