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fda range-angle decoupling beamforming method based on subarray division

A sub-array division and decoupling technology, applied in the field of signal processing, can solve problems such as poor adaptability to complex environments, and achieve the effect of improving flexibility and increasing degrees of freedom

Active Publication Date: 2018-07-06
XIDIAN UNIV
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AI Technical Summary

Problems solved by technology

[0007] In the past ten years, many characteristics of frequency diversity arrays have been studied. However, the distance and angle of the existing frequency diversity array pattern are coupled, and the distance-angle dependence is determined by the frequency increment. The adaptability to complex environments poor

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Embodiment Construction

[0033] The embodiments and effects of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0034] Reference figure 1 , The implementation steps of the present invention are as follows:

[0035] Step 1. Divide the frequency diversity array into sub-arrays.

[0036] Reference figure 2 , Divide the frequency hierarchical array into N sub-arrays, and introduce a different frequency step Δf in each sub-array n ,n=0,1,...,N; each sub-array contains M cells, the cell spacing is d, such as image 3 As shown, the signal frequency of the m-th unit is:

[0037] f m = F 0 +(m-1)Δf n ,m=1,2,...,M,

[0038] Where f 0 It is the reference operating frequency.

[0039] Step 2. Construct the array steering vector.

[0040] (2a) Construct the steering vector of the nth subarray:

[0041]

[0042] Where m = 1, 2, ..., M, M is the number of units in each sub-array, j represents the imaginary number, θ represents the angle, R represents the distance, ...

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Abstract

The invention provides a subarray-division-based FDA distance-angle decoupling wave beam formation method. With the method, a problem that distance-angle decoupling wave beam formation can not be realized by using the exiting frequency classification array can be solved. The provided method comprises: step one, a frequency classification array is divided into a plurality of sub arrays and frequency stepping values are introduced into the sub arrays respectively, so that a transmitting signal frequency is designed; step three, a subarray-division-based steering vector of a frequency classification array is constructed; step four, a subarray-division-based transmission weight vector of the frequency classification array is constructed; and step five, according to the guiding vector and the transmission weight vector of the array, a distance-angle two-dimensional wave beam formation directional diagram is obtained. According to the invention, the direction of the wave beam main lobe is changed and distance-angle two-dimensional decoupling wave beam formation is realized, so that wave beam control flexibility is substantially improved. The method can be applied to distance-angle domain combined detection of a target and the interference related to a distance can be suppressed.

Description

Technical field [0001] The present invention belongs to the technical field of signal processing, and particularly relates to an FDA distance-angle decoupling beamforming method based on sub-array division, which can be used for the joint detection of the target in the range-angle domain and suppress distance-related interference. Background technique [0002] The phased array antenna uses a phase shifter to change the initial phase of each antenna unit to achieve electronic beam scanning. It has the advantages of beam agility, simultaneous multi-beam and adaptive beam nulling. It is used in radar, sonar, wireless communication, radio astronomy and other fields It has been widely used. However, the beam steering vector of the phased array antenna is only related to the spatial angle, not the distance. Compared with the phased array antenna, the frequency diversity array antenna has more flexible beam control ability. It increases the freedom of the array in the distance dimensio...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/28G01S7/42
CPCG01S7/2813G01S7/42
Inventor 许京伟朱圣棋徐艳红廖桂生兰岚
Owner XIDIAN UNIV