One-dimensional DOA estimation method based on specific frequency combination signal

Abstract

The invention discloses a one-dimensional DOA estimation method based on a specific frequency combination signal. The method includes: transmitting a plurality of signals with specific frequencies, separating corresponding frequency signals from received signals of each array element through a plurality of narrow-band filters with different frequencies to obtain a frequency domain receiving data model, then normalizing a source signal matrix and reconstructing a frequency domain received data matrix, subjecting a uniform physical array to primary expansion to form a virtual non-uniform array,finally performing secondary virtual expansion on the virtual non-uniform array in combination with an existing non-uniform array data covariance matrix processing method, thus finally obtaining a virtual uniform array subjected to secondary expansion, and realizing secondary expansion of the array aperture. Under the condition that a traditional uniform array structure does not need to be changed, virtual expansion of the array aperture is achieved by receiving a plurality of narrow-band signals with specific frequencies and depending on the prior information of frequency proportion, so thatthe estimation precision is improved.

Description

technical field [0001] The invention relates to the technical field of target positioning, in particular to a one-dimensional DOA estimation method for realizing virtual array element expansion after joint processing of specific frequency combination signals. Background technique [0002] Direction of arrival estimation (DOA estimation) has been widely used in many fields, and DOA estimation refers to the method of estimating the direction and angle of the source target by using array signal processing technology in space or placing sensor arrays. As the space environment becomes increasingly complex, determining the AOA of target signals in various aspects such as target tracking and precision guidance, and conducting comprehensive surveillance and reconnaissance are the primary prerequisites for gaining the initiative in war. Therefore, it is of great significance to study super-resolution and high-precision DOA estimation technology. [0003] The performance of the exist...

AI Technical Summary

Problems solved by technology

However, selecting too few frequency points will lead to a decrease in estimation accuracy. At the same time, under the condition that the distance between adjacent array elements is kept constant, too much signal bandwidth will introduce too much array aperture loss.

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