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Direction finding method based on coupling array

A technology of coupled arrays and array antennas is applied in the field of direction finding applications using the relevant theoretical derivation of coupled arrays, and can solve problems such as strong coupling of array antennas and failure of direction finding methods.

Active Publication Date: 2020-06-09
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the development of radio frequency, microwave and millimeter wave integrated circuits, the demand for miniaturized direction finding system design based on array antennas is increasing, but the miniaturization of array antennas will lead to strong coupling, which will lead to the failure of traditional direction finding methods.

Method used

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  • Direction finding method based on coupling array
  • Direction finding method based on coupling array
  • Direction finding method based on coupling array

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Embodiment 1 adopts figure 2 The array antenna elements shown and their coupled arrays are shown to demonstrate the above approach. The element spacing of the array antenna is 0.3 times the working wavelength, the dielectric constant of the substrate is 6.15, and the thickness of the substrate is 1.6mm.

[0078] First, set the incident angle of the electromagnetic incident wave according to the actual situation range of values, V can be obtained by constructing the known incident angle n , by CST TM Microwave Studio pair figure 2 The coupled array shown in (b) is simulated to obtain the circuit impedance matrix Z. Based on the simulated circuit impedance matrix Z, incident angle and forward equation, the corresponding values ​​of the array antenna units 6, 7, 8, 9, 10, and 11 can be calculated. I n , and then normalize with the receiving current of the array antenna unit 6 as a reference, the normalized receiving current vector I' of the array antenna unit 6, 7...

Embodiment 2

[0082] Embodiment 2 adopts Figure 5 The direction finding hardware and software system shown demonstrates the method.

[0083] Figure 5 As shown, the hardware system includes a coupling array composed of array antenna units 13, 14, 15, 16, 17, 18, receiver modules 19, 20, 21, 22, 23, 24, phase detection modules 25, 26, 27, 28,29, single-chip microcomputer 30, computer 31 and CMOS image camera 32 form. After the electromagnetic incident waves sent by the signal source 12 are received by the array antenna units 13, 14, 15, 16, 17, 18, the receiving current on the array antenna units is input to the receiver modules 19, 20, 21, 22, 23, 24. Taking the intermediate frequency signal output by the receiver module 23 as a reference signal, after the intermediate frequency signal output by the receiver module 19, 20, 21, 22, 24 is input to the phase detection module, the receiver module 19, 20, 21, 22 is obtained by phase detection. , 24 and the signal phase difference informatio...

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Abstract

The invention discloses a direction finding method based on a coupling array. The method comprises steps of adopting a direction finding system to establish a hybrid equivalent circuit model for a coupling array, shooting an image of a signal source through a CMOS image sensor and processing the image to obtain the incident angle information, moreover, detecting the received current phase difference information when an electromagnetic incident wave emitted by the signal source is received in real time by utilizing a signal phase detection system based on the coupling array; and lastly, solvingthe hybrid equivalent circuit model through an optimization algorithm by combining the received current information and the incident angle information, and processing the received current phase difference information acquired by a to-be-measured signal source by adopting the hybrid equivalent circuit model to obtain the position of the signal source, and realizing positioning measurement of the signal source. The method is advantaged in that direction finding of the signal source based on the coupling array can be realized, and the direction finding method can be extensively applied to multiple fields of beam scanning, forming, direction finding and the like.

Description

technical field [0001] The invention discloses an application method of a coupled array, which relates to a method for realizing direction-finding application by adopting relevant theoretical derivation of the coupled array. Background technique [0002] With the development of radio frequency and baseband integrated circuits, the demand for miniaturization of microwave systems based on array antennas is gradually increasing. Although the miniaturization of the RF front-end and baseband system will improve the working performance, the miniaturized array antenna in the system will lead to strong coupling between the array antenna elements, making the current of each RF path have non-independent components and are difficult to separate, making the system working performance extremely Great reduction. [0003] The coupling relationship between array antenna elements can be effectively characterized by a circuit impedance, but it is difficult to measure the circuit impedance in...

Claims

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Application Information

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IPC IPC(8): G01S3/48G01S3/12G01C11/00H01Q21/06
CPCG01S3/48G01S3/12G01C11/00H01Q21/061
Inventor 王浩冉立新
Owner ZHEJIANG UNIV