High-precision direction finding method under large-step beam scanning condition

Abstract

The invention provides a high-precision direction finding method under a large-step beam scanning condition, and belongs to the technical field of array signal processing. According to the method, firstly, information source azimuth coarse measurement is performed through conventional beam forming airspace scanning, and then the information source azimuth angle is accurately calculated by using the amplitude and phase relation of sum and difference beams between subarrays, so that high-precision direction finding under the condition of large-step beam scanning is realized.

Description

technical field [0001] The invention relates to the technical field of array signal processing, in particular to a high-precision direction finding method under the condition of large stepping beam scanning. Background technique [0002] In the traditional beamforming technology, the direction finding accuracy is usually related to the beam width of the array and the angle scanning step. The narrower the beam width and the smaller the angle search step, the higher the direction finding accuracy. Therefore, in the conventional beamforming technology, it is difficult to take into account the direction finding accuracy and the system response speed; in the traditional sum-difference beam angle measurement method, it is often necessary to first calculate the angle detection value and compare it with the locally saved angle detection curve, etc. The data is fitted to obtain the deviation angle between the source azimuth and the beam pointing angle, and then the incoming wave dire...

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Problems solved by technology

[0002] In traditional beamforming technology, the direction finding accuracy is usually related to the beam width of the array and the angle scanning step. The narrower the beam width and the smaller the angle search step, the higher the direction finding accuracy, and at the same time, the data processing difficulty of the system is also higher. Therefore, in the conventional beamforming technology, it is difficult to balance the direction finding accuracy and the system response speed; in the traditional sum-difference beam angle measurement method, it is often necessary to calculate the angle discrimination value first and compare it with the locally saved angle discrimination curve, etc. The data is fitted to obtain the deviation angle between the source azimuth and the beam pointing angle, and then the direction of arrival of the signal source is calculated from the deviation angle and beam pointing angle. Therefore, the storage of local data and subsequent fitting calculations will take up a lot of system resources , and the source azimuth is calculated indirectly by the deviation angle, which is more likely to introduce errors

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