SMV model-based Hadamard product fast DOA estimation method utilizing tail optimization

Abstract

The invention discloses an SMV model-based Hadamard product fast DOA estimation method using tail optimization. The method comprises the steps of: estimating a received data DOA by using a DOA estimation algorithm to obtain a first estimation result and an array output result; performing normalization processing on the first estimation result by using a normalization model to obtain an initial solution; obtaining a position sorting result according to a sorting result of the amplitudes of the first estimation result; obtaining a diagonal matrix according to the position sorting result and an all-1 array; obtaining a first parameter and a second parameter according to the array output result, the initial solution and the diagonal matrix; based on an estimation result calculation formula, obtaining a second estimation result according to the first parameter and the second parameter; and obtaining a final estimation result according to the relationship between the indexes of iteration sequence numbers and the number of array elements, the first estimation result and the second estimation result. According to the method, the tail of a received signal is optimized by using the Hadamard product parameterization product principle, and energy is concentrated to a target peak value to a great extent, so that an estimated angle is more accurate.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a Hadamard product fast DOA estimation method based on an SMV model and utilizing tail optimization. Background technique [0002] Electronic reconnaissance is an important branch of electronic countermeasures, and direction of arrival (DOA) estimation is one of the main contents of electronic reconnaissance. The electronic reconnaissance system based on the sparse array has the potential of high-precision direction finding, which can not only reduce the complexity of the system (that is, achieve a certain degree of compression in the airspace), but also avoid the grating lobe problem in the wide-band space caused by the uniform array (especially in the receiving frequency band high-frequency signal). Because the gain of the wide-band antenna unit is not high, the signal-to-noise ratio is often low when the electronic reconnaissance array detects the long-d...

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Problems solved by technology

Electronic reconnaissance systems installed on vehicle or ship-borne platforms are prone to multipath phenomena when the frequency band of the received signal is low due to the low erection height and the influence of platform scattering, that is, the presence of direct waves and multipath waves at the same time, which is called the coherent source situation. The decoherence processing algorithm will pay the price of spatial resolution and accuracy reduction caused by aperture loss

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