Method and device for constructing four-element three-dimensional array

A three-dimensional array and four-array element technology, which is applied in the direction of measuring devices, orientators for determining directions, and direction finders using radio waves, etc., can solve the problem of low direction finding accuracy, improve direction finding accuracy, and save computing resources , to meet the effect of direction finding accuracy

Active Publication Date: 2017-08-22
36TH RES INST OF CETC
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Problems solved by technology

[0004] The present invention provides a method and device for constructing a three-dimensional array of four array elements, so as to solve the problem of low direction finding accuracy of the existing planar array in the area of ​​a small pitch angle under the condition that the direction of arrival of the radiation source is determined.

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  • Method and device for constructing four-element three-dimensional array
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  • Method and device for constructing four-element three-dimensional array

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Embodiment 1

[0029] figure 1 It is a flowchart of a method for constructing a four-element three-dimensional array according to an embodiment of the present invention, such as figure 1 as shown,

[0030] In step S110, the three-dimensional Cartesian coordinate system in which the traditional three-element planar array is located is arbitrarily rotated by an angle, and a non-coplanar fourth array element is added to construct a preliminary four-element three-dimensional array, wherein the first array element is The origin of the 3D Cartesian coordinate system.

[0031] In step S120, phase differences of the other three array elements relative to the first array element are time-divisionally calculated based on the preliminary four-element stereo array.

[0032] In step S130, a direction finding model is constructed according to the calculated phase difference of the other three array elements relative to the first array element.

[0033] In step S140, the direction finding error between ...

Embodiment 2

[0092] image 3 It is a structural schematic diagram of a device for constructing a four-element three-dimensional array according to an embodiment of the present invention, such as image 3 As shown, the device 200 includes:

[0093] The three-dimensional array preliminary construction unit 210 is used to rotate the traditional three-element planar array by an angle, add a non-coplanar fourth array element, and construct a preliminary four-element three-dimensional array, wherein the first array element is the The origin of the three-dimensional Cartesian coordinate system;

[0094] The phase difference calculation unit 220 is configured to time-divisionally calculate the phase differences of the other three array elements relative to the first array element based on the preliminary four-element three-dimensional array.

[0095] A direction-finding model construction unit 230, configured to construct a direction-finding model according to the calculated phase difference of ...

Embodiment 3

[0117] In this embodiment, an implementation case of a low-orbit satellite four-element three-dimensional rectangular array is used to demonstrate its application steps and effects. In this implementation case, the phase difference time measurement system is adopted, and the channel phase difference measurement error is 10°. In practical applications, in addition to the high requirements for direction finding accuracy near the sub-satellite point (that is, near the pitch angle of 90°), there are also certain requirements for the direction finding accuracy in the area with a pitch angle of 35° to 50°. Figure 4 It is a schematic diagram of the direction-finding accuracy contour line of the four-element three-dimensional rectangular array when γ=45° according to an embodiment of the present invention; Figure 5 It is a schematic diagram of the direction-finding accuracy contour line of the four-element three-dimensional rectangular array when γ=60° according to an embodiment of ...

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Abstract

The invention discloses a method and system for constructing a four-element three-dimensional array. The method comprises the following steps of: arbitrarily rotating a three-dimensional rectangular coordinate system where a traditional three-element planar array is located by an angle, adding a non-coplanar fourth element to construct a preliminary four-element three-dimensional array; calculating the phase differences of the other three elements relative to the first element at different time; creating a direction finding model according to the calculated phase differences of the other three elements relative to the first element; calculating a direction-finding error between the estimated value and the actual value of the to-be-measured wave direction by using the direction finding model; selecting a plurality of fourth elements with different rotation angles, calculating the direction-finding precision of the to-be-measured wave direction in a desired pitch angle area, determining the rotation angle corresponding to the calculated highest direction-finding precision as a best rotation angle, and constructing the final four-element three-dimensional array according to the best rotation angle. The four-element three-dimensional array constructed by using the method is capable of improving the direction finding precision in a small pitch angle area.

Description

technical field [0001] The invention relates to the technical field of array antenna direction finding, in particular to a method and device for constructing a three-dimensional array of four array elements. Background technique [0002] The array antenna direction finding system is an important passive direction finding equipment. Compared with the active radar system, in addition to the advantages of anti-interception and anti-jamming, it also has the advantages of high direction finding accuracy, small volume and weight, and low cost. In recent years, it has been paid attention to and has been applied to spaceborne equipment many times. Most of the commonly used direction-finding array antennas are planar arrays, that is, multiple array elements are on the same plane. In the application process, this kind of planar array can often obtain relatively ideal direction finding accuracy in the normal area of ​​the array (usually the position of the satellite sub-satellite poin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/12G01S3/48
Inventor 陆安南尤明懿邱焱
Owner 36TH RES INST OF CETC
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