A Direction Finding Accuracy Analysis Method Applicable to Arbitrary Planar Arrays
A technology of planar array and precision analysis, which is applied in the direction of testing dielectric strength, measuring direction, measuring device, etc., to achieve the effect of ensuring safe operation and reducing costs
Active Publication Date: 2019-10-11
XI AN JIAOTONG UNIV +2
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In fact, this method is limited and the array with the best performance is often not selected
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[0035] The specific implementation manner of the present invention will be described below in conjunction with the accompanying drawings and embodiments.
[0036] Such as figure 1 As shown, a method for analyzing direction finding accuracy applicable to any planar array of the present invention comprises the following steps:
[0037] 1) Establish a coordinate system for any planar array, so that the geometric center of the planar array is located at the coordinate origin;
[0038] Described in this step establishes a coordinate system to any planar array, the geometric center of the array is O, the coordinates of O (x 0 ,y 0 ) is (0,0), and the coordinates of each element in the array satisfy the following relationship:
[0039]
[0040] where x i and y i are the abscissa and ordinate of the i-th array element respectively, i=1...N, and N is the number of array elements.
[0041] As an embodiment, the first array and the second array are composed of four UHF array ele...
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The invention discloses a direction finding accuracy analysis method applicable to an arbitrary plane array. The direction finding accuracy analysis method includes the steps: building a coordinate system for the arbitrary plane array and positioning the geometric center of the array at a coordinate origin; evaluating direction finding accuracy of the array by a Cramer-Rao lower bound, and calculating important parameters including amplitude, direct-current offset and primary phase according to coordinates of antennas; listing function expressions about true azimuth angles and true pitch angles of the Cramer-Rao lower bound, and drawing a relation curve about the true azimuth angles and the true pitch angles of the Cramer-Rao lower bound according to the function expressions. If the Cramer-Rao lower bound within the range of a certain true azimuth angle and a certain true pitch angle is smaller, the direction finding accuracy of the position is higher. The direction finding accuracy analysis method is applicable to arbitrary application conditions in a transformer substation, and has a guiding function for optimizing layout of the antenna array. The antenna array optimized by the method has a high direction finding performance and a small array size.
Description
technical field [0001] The invention belongs to the technical field of partial discharge detection, and in particular relates to a direction finding accuracy analysis method suitable for any plane array. Background technique [0002] There are many electrical equipment in the open substation, so it is of great significance to ensure the safe and stable operation of the system. Partial discharge is a symptom of equipment insulation deterioration. If it is not detected early, it will gradually develop into breakdown discharge of equipment, which will bring immeasurable economic losses to substations. Nowadays, the commonly used partial discharge detection technology is to fixedly install the sensor on single equipment such as transformers and gas-insulated combined electrical equipment, but it lacks attention to equipment such as circuit breakers and isolating switches. To this end, British scholars proposed to establish a mobile inspection platform, using UHF antenna arrays ...
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IPC IPC(8): G01R31/12G01S3/00
Inventor 刘青邓军波朱明晓王彦博张冠军郭安祥刘孝为
Owner XI AN JIAOTONG UNIV