Two-dimensional DOA (direction of arrival) angle estimation method based on antenna uniform planar array

Abstract

The invention discloses a two-dimensional DOA (direction of arrival) angle estimation method based on an antenna uniform planar array, and mainly solves problems of slow response speeds in target detection and passive location and big estimation errors which are caused by large computation amount of direction angle estimation in the prior art. The method comprises realization steps of forming a uniform planar array by using antenna receivers; calculating echo signals of all the antenna receivers; calculating noise subspaces of the echo signals of the antenna receivers; substituting a one-dimensional angle which is set to be a fixed value into an angle solving function to obtain another one-dimensional angle value, and obtaining multiple groups of values through multiple computations; generating an amplitude spectra by using the multiple groups of angle values; and obtaining two-dimensional angle values of the antenna uniform planar array by searching peak points in the amplitude spectra. According to the method, the two-dimensional DOA angle estimation is simplified into a process of one-dimensional DOA angle estimation, and thus the computation amount is substantially reduced, speeds in target detection and passive location response are improved, parameter estimation errors caused by information delay are prevented, and accordingly the method can be applied to rapid target detection and passive location.

Description

Technical field [0001] The invention belongs to the technical field of signal processing, and particularly relates to a two-dimensional direction of arrival estimation method based on an antenna uniform plane array, which can be used for target reconnaissance and passive positioning. Background technique [0002] DOA estimation is to use antenna signal arrays at different positions in space to receive signals from multiple signal sources in different directions, and use modern signal processing methods to quickly and accurately estimate the direction of the signal source. In radar, sonar, and wireless Communication and other fields have important application value. Two-dimensional DOA estimation generally uses area arrays or vector sensors to estimate two-dimensional parameters. Most effective two-dimensional DOA estimation algorithms are direct extensions of one-dimensional DOA estimation algorithms and do not make full use of the array received signals. The multi-dimensional i...

AI Technical Summary

Problems solved by technology

Two-dimensional direction of arrival estimation generally uses area array or vector sensors to estimate two-dimensional parameters. Most effective two-dimensional direction of arrival estimation algorithms are direct extensions of one-dimensional direction of arrival estimation algorithms, and do not make full use of the array received signals. The multi-dimensional information carried often has disadvantages such as excessive calculation or angle matching

The first method needs to use two-dimensional search, and its calculation amount is the square times of one-dimensional search, so the calculation amount is huge; the second method needs to use the angle pairing algorithm after completing the one-dimensional angle estimation respectively, and this process still needs to spend A certain amount of calculation, so these two methods have a large amount of calculation

In practical applications, both target reconnaissance and passive positioning need to be performed on the basis of angle estimation. If the calculation speed of angle estimation is slow, the response speed of target reconnaissance and passive positioning will be slow, and even cause large parameter estimation errors due to information lag.

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