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Subarray-division-based FDA distance-angle decoupling wave beam formation method

A sub-array division and decoupling technology, applied in the field of signal processing, can solve problems such as poor adaptability to complex environments

Active Publication Date: 2016-07-20
XIDIAN UNIV
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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 further described in detail below in conjunction with the accompanying drawings.

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

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

[0036] refer to figure 2 , divide the frequency graded array into N sub-arrays, and introduce a different frequency step Δf into each sub-array n ,n=0,1,…,N; each subarray contains M units, and the unit spacing is d, such as image 3 As shown, the signal frequency of the mth unit is:

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

[0038] Among them, f 0 as the reference operating frequency.

[0039] Step 2, construct the array steering vector.

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

[0041] a n ( R , θ ) = ...

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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 invention belongs to the technical field of signal processing, and in particular relates to an FDA distance-angle decoupling beamforming method based on subarray division, which can be used for joint detection of a target in the distance-angle domain and suppresses distance-related interference. Background technique [0002] The phased array antenna uses a phase shifter to change the initial phase of each antenna unit to realize electronic beam scanning. It has the advantages of beam agility, simultaneous multi-beam and adaptive beam zeroing. It is widely used in radar, sonar, wireless communication, radio astronomy and other fields. achieved a wide range of applications. However, the beam steering vector of the phased array antenna is only related to the spatial angle, and has nothing to do with the distance. Compared with the phased array antenna, the frequency diversity array antenna has more flexible beam steering ability. It increases the fre...

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Application Information

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IPC IPC(8): G01S7/28G01S7/42
CPCG01S7/2813G01S7/42
Inventor 许京伟廖桂生徐艳红兰岚
Owner XIDIAN UNIV
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