Beam synthesis method of frequency diversity array radar based on non-uniform array element spacing

A technology of frequency diversity array and comprehensive method, which is applied in radio wave measurement system, radio wave reflection/reradiation, instruments, etc., can solve the problems that are not easy to realize, increment, etc., and achieve reduced error, good focusing effect, and improved focusing effect of effect

Active Publication Date: 2018-07-06
NANJING UNIV OF SCI & TECH
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Problems solved by technology

The above method is relatively easy to implement in theory, but in actual situati

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  • Beam synthesis method of frequency diversity array radar based on non-uniform array element spacing
  • Beam synthesis method of frequency diversity array radar based on non-uniform array element spacing
  • Beam synthesis method of frequency diversity array radar based on non-uniform array element spacing

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Embodiment

[0050] FDA has effectively solved the limitations of phased arrays, and can also focus energy on distance, and can be widely used in practical applications, such as weak target detection, microwave wireless power transmission, medical radar, etc. However, the traditional frequency diversity array also has this great defect. Although it can provide focusing capabilities in both angle and distance, but due to the coupling relationship between angle and distance, it also leads to a "S" focusing effect in the target area. ” shape, high side lobe level, large error, and unsatisfactory focusing effect.

[0051] Traditional frequency diversity linear arrays such as figure 2 As shown, it is made of M array elements, and the waveform expression of the mth transmitting array element is:

[0052]

[0053] At the far-field target area (r, θ), the pattern expression is:

[0054]

[0055] The first item in the expression has nothing to do with the focus effect, and only the two ite...

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Abstract

The invention discloses a beam synthesis method of a frequency diversity array radar based on non-uniform array element spacing, which comprises the following steps of: setting a transmission waveformof each array element; setting the waveform expression at each point in the airspace; adding the M waveforms together to obtain an array element emission direction graph expression; setting the arrayelement spacing of M array elements; And simulation is carried out against a meta-emission direction diagram to obtain the array element emission direction diagram. The invention solves the problem of distance and angle coupling well. By changing the spacing of the array elements, the array becomes a non-uniform linear frequency diversity array, which greatly improves the focusing effect, reducesthe focus error and makes up the defects of the traditional frequency diversity array.

Description

technical field [0001] The invention relates to beam synthesis technology, in particular to a beam synthesis method of frequency diversity array radar based on non-uniform array element spacing. Background technique [0002] Phased-array radar can provide directional gain to detect faint targets at perceptual angles, and can suppress the height of side lobes in other areas. However, the defect of phased array is that its pattern only has angle dimension, but no distance dimension. [0003] In order to overcome the above defects, researchers have proposed a frequency diverse array (frequency diverse arrayFDA), which includes angle, distance, and time, and has been intensively studied in recent years. However, due to the coupling of distance and angle, the traditional frequency diversity array has an "S"-shaped focusing effect in the target area, so the focusing error is large. In order to overcome this problem, solving the distance-angle coupling becomes the most critical i...

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Application Information

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IPC IPC(8): G01S13/02G01S7/42G01S13/00
CPCG01S7/42G01S13/006G01S13/02G01S2013/0245
Inventor 高新宇宋耀良
Owner NANJING UNIV OF SCI & TECH
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