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CN-121995307-A - Direction finding method based on normalized power pattern

CN121995307ACN 121995307 ACN121995307 ACN 121995307ACN-121995307-A

Abstract

The invention discloses a direction finding method based on a normalized power pattern, and belongs to the technical field of antennas. The method utilizes the digitized normalized power direction diagram, combines a small amount of scanning movement to carry out matching calculation, and can quickly and accurately determine the angular position of the measurement target. Meanwhile, the normalized power pattern is intercepted based on the orthogonal section group and then polynomial fitting is carried out so as to fit parameter digital pattern data, and the data storage capacity is greatly reduced. The invention ensures the direction-finding precision and obviously improves the direction-finding speed under the condition of not changing the hardware of the antenna device.

Inventors

  • ZHANG SHUO
  • QIN CHAO
  • HUANG YUANQING
  • WANG YIHUAN
  • CUI YULONG

Assignees

  • 中国电子科技集团公司第五十四研究所

Dates

Publication Date
20260508
Application Date
20260130

Claims (6)

  1. 1. A direction finding method based on normalized power pattern, comprising the steps of: (1) Acquiring normalized power pattern data in the central range of a main lobe of the antenna device; (2) Determining two orthogonal section groups based on the mounting mode of the antenna device on a seat frame of the antenna device, defining a section I and a section II, respectively cutting a normalized power pattern, performing polynomial fitting on obtained cutting line data, recording fitting parameters, and generating a digital pattern; (3) The antenna device scans along the direction parallel to the first tangential plane, acquires and records the power value and the corresponding angle output by the signal receiver, and rotates to the angle corresponding to the maximum power value after the scanning is completed; (4) The antenna device scans along the direction parallel to the second section and simultaneously reciprocates along the direction parallel to the first section in a certain rule, and the power value and the corresponding angle output by the signal receiver are collected and recorded; (5) And matching the power value corresponding to the scanning track with the digital directional diagram, determining the angle deviation between the matching starting point and the direction-finding target, and calculating the angular position of the direction-finding target.
  2. 2. The direction finding method based on normalized power pattern according to claim 1, wherein the normalized power pattern data in the main lobe center range of the antenna device in step (1) is obtained by electrical test data or simulation data of the antenna device, the pattern data is not limited to the main lobe, and the main lobe center range of the antenna device is not smaller than the half power beam range of the antenna device.
  3. 3. The direction finding method based on normalized power pattern according to claim 1, wherein the specific manner of step (2) is: (201) Generating a plane parallel to the plane formed by the E axis of the A-E mount and the antenna normal, or a plane group of the plane formed by the Y axis of the X-Y mount and the antenna normal based on the mounting mode of the antenna device on the mount As a tangential plane, and generating a plane parallel to the plane formed by the A axis of the A-E mount and the antenna normal, or a plane group formed by the X axis of the X-Y mount and the antenna normal As a second cut surface; (202) Normalizing the power pattern by using the tangent plane-cutting to obtain a plane Corresponding sets of cut line data pairs , , , For the corresponding number of cut surfaces, At the same time, the two sections are used for cutting the normalized power direction diagram to obtain a plane Corresponding sets of cut line data pairs ; , , For the number of the second sections corresponding to the number of the second sections, The number of data points for the cut line; and (3) with The values of (c) may be the same, And (3) with The values of (2) may be the same; (203) For each plane respectively Each plane Polynomial fitting is carried out on the corresponding data pair set, and the fitting form is that Wherein T is the fitting order, In order to fit the coefficients of the coefficients, For cutting line data pair, get and Corresponding to Group fitting parameters and AND Corresponding to Group fitting parameters; (204) Assembling the planes Corresponding to Group fitting parameters and plane group Corresponding to The set of fitting parameters together form a digitized pattern.
  4. 4. A direction finding method based on normalized power pattern according to claim 3, wherein the specific manner of step (3) is: (301) The antenna arrangements being in parallel The power value and the corresponding angle output by the signal receiver are collected and recorded; (302) And after the scanning is finished, the antenna device rotates to an angle corresponding to the maximum value of the recorded power.
  5. 5. A direction finding method based on normalized power pattern according to claim 3, wherein the specific manner of step (4) is: (401) The antenna means being parallel to Is scanned in a clockwise direction while being parallel to Reciprocating motion is carried out according to a set rule, and the power value and the corresponding angle output by the signal receiver are collected and recorded; (402) If the power value in the recorded data is greater than The number of data points is less than The antenna arrangement is then parallel to Is scanned in a counterclockwise direction while being parallel to The direction of the signal receiver reciprocates according to a set rule, the power value output by the signal receiver and the corresponding angle are acquired and recorded, wherein, As a threshold value of the power value, The minimum amount of data required for the matching calculation.
  6. 6. The direction finding method based on normalized power pattern according to claim 1, wherein the specific manner of step (5) is: (501) Intercepting power value larger than Is used to determine the data of the (c) and its corresponding angle, is recorded as Calculating test data as a match; (502) Construction of an evaluation function The following are provided: in the formula, For scanning the power values on the trace corresponding digitized pattern, To test the start of data for a match calculation, To digitize the pattern up and down A corresponding power value; (503) Calculating an evaluation function At minimum value The angular position of the direction-finding target The method comprises the following steps: in the formula, The angular position of the start point of the test data at the time of the corresponding matching calculation, Is that Angular position on the digitized pattern.

Description

Direction finding method based on normalized power pattern Technical Field The invention relates to the technical field of antennas, in particular to a direction finding method based on a normalized power pattern. Background The radio direction is used as a key technology in modern communication and navigation systems and is widely applied to the fields of reconnaissance, emergency rescue, spectrum monitoring and the like, and the core is that the spatial orientation of a signal source is determined through the amplitude, phase or power distribution characteristic of a received signal. In the existing various direction finding technologies, the direction finding method based on the parabolic antenna has been widely applied to long-distance and high-precision direction finding tasks because of higher directivity and excellent gain performance. The antenna concentrates energy in a specific direction through the reflecting structure, so that the signal-to-noise ratio and the angular resolution are obviously improved, and the antenna is suitable for stable direction finding in a complex electromagnetic environment. However, this method also has significant limitations, mainly in response delays due to mechanical scanning, resulting in less than ideal direction finding speeds. Therefore, there is a need for a direction finding method that can significantly improve measurement efficiency while maintaining the advantages of directionality and high accuracy. Disclosure of Invention In view of this, the present invention proposes a direction finding method based on normalized power pattern. The method utilizes the digitized normalized power direction diagram, combines a small amount of scanning movement to carry out matching calculation, and can quickly and accurately determine the angular position of the measurement target. Meanwhile, the normalized power pattern is intercepted based on the orthogonal section group and then polynomial fitting is carried out so as to fit parameter digital pattern data, and the data storage capacity is greatly reduced. The invention ensures the direction-finding precision and obviously improves the direction-finding speed under the condition of not changing the hardware of the antenna device. In order to achieve the above purpose, the invention adopts the following technical scheme: a direction finding method based on normalized power pattern, comprising the steps of: (1) Acquiring normalized power pattern data in the central range of a main lobe of the antenna device; (2) Determining two orthogonal section groups based on the mounting mode of the antenna device on a seat frame of the antenna device, defining a section I and a section II, respectively cutting a normalized power pattern, performing polynomial fitting on obtained cutting line data, recording fitting parameters, and generating a digital pattern; (3) The antenna device scans along the direction parallel to the first tangential plane, acquires and records the power value and the corresponding angle output by the signal receiver, and rotates to the angle corresponding to the maximum power value after the scanning is completed; (4) The antenna device scans along the direction parallel to the second section and simultaneously reciprocates along the direction parallel to the first section in a certain rule, and the power value and the corresponding angle output by the signal receiver are collected and recorded; (5) And matching the power value corresponding to the scanning track with the digital directional diagram, determining the angle deviation between the matching starting point and the direction-finding target, and calculating the angular position of the direction-finding target. Further, in the step (1), normalized power pattern data in a main lobe center range of the antenna device is obtained through electrical test data or simulation data of the antenna device, the pattern data is not limited to the main lobe, and the main lobe center range of the antenna device is not less than a half power beam range of the antenna device. Further, the specific mode of the step (2) is as follows: (201) Generating a plane parallel to the plane formed by the E axis of the A-E mount and the antenna normal, or a plane group of the plane formed by the Y axis of the X-Y mount and the antenna normal based on the mounting mode of the antenna device on the mount As a tangential plane, and generating a plane parallel to the plane formed by the A axis of the A-E mount and the antenna normal, or a plane group formed by the X axis of the X-Y mount and the antenna normalAs a second cut surface; (202) Normalizing the power pattern by using the tangent plane-cutting to obtain a plane Corresponding sets of cut line data pairs,,,For the corresponding number of cut surfaces,At the same time, the two sections are used for cutting the normalized power direction diagram to obtain a planeCorresponding sets of cut line data pairs;,,For the number of the s