Correlation interferometer direction-finding method based on phase difference increment

Abstract

The invention relates to the field of correlation interferometers in radar, and discloses a correlation interferometer direction-finding method based on phase difference increment. The method includes step 1, confirming azimuthal angle increment; step 2, acquiring an actually measured phase difference incremental vector; step 3, acquiring a non-fuzzy actually measured phase difference incremental vector; step 4, selecting all the phase difference incremental vector samples with pitch angles as fixed angles; step 5, calculating similarities of the actually measured phase difference incremental vector and selected phase difference incremental vector samples selected in the step 4; step 6, acquiring an azimuthal angle rough estimated value; step 7, selecting all the phase difference incremental vector samples with azimuthal angles same as the azimuthal angle rough estimated value in step 6; step 8, calculating similarities of the actually measured phase difference incremental vector and the selected phase difference incremental vector samples in step 7; step 9, acquiring a pitch angle rough estimated value and an azimuthal angle rough estimated value; step 10, forming a new sample database; and step 11, calculating similarities to acquire an pitch angle estimated value and an azimuthal angle estimated value. With the correlation interferometer direction-finding method, rapid and high-precision direction finding of the direction-finding system can be realized within wide frequency range.

Description

technical field [0001] The invention belongs to the field of correlation interferometers in radar communication, in particular to a direction finding method based on phase difference increments of correlation interferometers. Background technique [0002] In the existing direction finding system, interferometer direction finding has the advantages of high direction finding accuracy, simple method and fast speed, so it has been widely used in military and civilian fields. In the military field, it can locate radiation sources such as radar, communication, and measurement and control, and can play an important role in the implementation of targeted electronic jamming and military strikes; in the civilian field, it can be used for traffic control, life rescue, and radio spectrum management etc. [0003] The phase interferometer determines the direction of the incoming wave signal by measuring the phase difference between the receiving array elements. In various phase interfero...

AI Technical Summary

Problems solved by technology

These methods can ensure real-time direction finding by reducing the amount of system computation or increasing the processing speed, but they all have some shortcomings

Although the space angle direction finding method reduces the amount of calculation of the system, it sacrifices the direction finding accuracy; the GPU implementation can improve the processing speed through efficient parallel operations, but it has high requirements for the hardware platform; the direction finding method based on dimension splitting is in the While greatly reducing the amount of calculations, it can guarantee a high amount of calculations, but this method is due to the existence of phase ambiguity (see literature: Research on Angle of Arrival Estimation Method Based on Multi-group Deambiguation of Phase Interferometer Array, Gong Xiangyi, Yuan Junquan, Su Linghua; Journal of Electronics and Information Technology, 2006, 28 (1): Page (s): 55-59), it is difficult to apply to wide frequency range direction finding

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