A Single-Shot 2D DOA Estimation Method Based on Three Parallel Line Arrays

Abstract

The invention belongs to the technical field of electronic countermeasures, and in particular relates to a single-snapshot two-dimensional DOA estimation method based on three parallel linear arrays. The technical scheme adopted in the present invention is: multiply the single snapshot data received by the three parallel linear arrays with the reference array element data to construct three full-rank pseudo-matrices, based on the rotation differences between the three constructed pseudo-matrices For denaturation, use the two-dimensional ESPRIT method to solve two rotation matrices, realize the two-dimensional angle parameter pairing and solve the azimuth and elevation angle of the incident signal through the eigendecomposition of the rotation matrix, and complete the two-dimensional DOA estimation. The beneficial effect of the present invention is that the present invention can use the array receiving data of a single snapshot to perform two-dimensional estimation on the DOA of the signal, and the algorithm has a lower degree of freedom loss, and has a better signal-to-noise ratio and array receiving conditions. resolution and statistical performance.

Description

Technical field [0001] The present invention belongs to the field of electronic counterming techniques, and more particularly to a single fast shot 2D DOA estimation method based on three parallel line arrays. Background technique [0002] In electronic confrontation, the array can intercepted effective information for DOA estimation is often insufficient, and there is only one quick shot in the case. For example, as frequency hopping communications and short-time communication technologies are widely used in military communications, a frequency hopping (F-H) signal with anti-reconnaissance attributes, the burst signal is short, the array is only short, the array is only Can intercepted very few quick shots. In addition, airborne, carrier container, etc., the real-time requirements of the direction of the system, can not accumulate quick-shoot data through long-term samples, and only use a single quick shot. As the space electromagnetic against the situation is getting increasing...

AI Technical Summary

Problems solved by technology

[0003] Traditional DOA estimation methods such as MUSIC and ESPRIT are based on the multi-snapshot signal assumption. Under a single snapshot, the data is not enough to support accurate division of the subspace, and the estimation performance is extremely poor or even invalid.

At present, most of the single-shot DOA estimation methods based on spatial smoothing or constructing pseudo-covariance matrix inevitably have large array aperture and degree of freedom loss. Some literatures propose pseudo-covariance based on strict non-circular signal characteristics Matrix construction method, although this method has no degree of freedom loss, but requires all signals to have zero initial phase, this constraint is almost impossible to achieve in practice

In addition, due to the need for complex mathematical reconstruction of the array data, most single-shot DOA estimation studies are based on one-dimensional linear arrays, which can only achieve one-dimensional DOA estimation, and can be realized on more complex two-dimensional planar arrays. Single-shot 2D DOA estimation is still a big challenge

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