Uniform linear array virtual synthesis short-time large-aperture high-precision direction finding method

Abstract

The invention discloses a uniform linear array virtual synthesis short-time large-aperture high-precision direction finding method. The method comprises the following specific steps: driving a high-speed switch through a high-speed switch logic driver, taking delta t as the conversion time of the high-speed switch, carrying out polling switching of all antenna array elements, and acquiring receiving data of all antenna array elements in a circulating manner; performing phase compensation calibration and amplitude equalization control on the obtained receiving data of each antenna array elementto form a virtual short-time large aperture, and acquiring sampling data obtained based on the virtual short-time large aperture; and performing down-conversion and digital processing on the acquiredsampling data obtained based on the virtual short-time large aperture. On the basis of a uniform linear array, high-speed switch polling is utilized to switch and connect each antenna array element,a short-time large aperture is virtually formed through phase compensation calibration and amplitude equalization control, and high-precision direction finding is realized through signal processing according to sampling data obtained through the virtual short-time large aperture.

Description

technical field [0001] The invention relates to the technical field of electronic reconnaissance, and relates to a direction finding method for radiation source signals, in particular to a uniform line array virtual synthesis short-time large aperture high-precision direction finding method. Background technique [0002] The angle of arrival estimation of the radiation source signal is to use the radiation source signal received by electronic reconnaissance to estimate the arrival direction of the radiation source signal through signal processing; at present, the angle of arrival estimation methods of the radiation source signal mainly include amplitude method direction finding, phase Method direction finding and spatial spectrum estimation direction finding and other methods. [0003] The amplitude method direction finding is to use the received signal amplitude information to find the direction. The direction finding accuracy is related to the pattern of the array. When th...

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Problems solved by technology

[0003] The amplitude method direction finding is to use the received signal amplitude information to find the direction. The direction finding accuracy is related to the pattern of the array. When the distance between the array elements is constant, the larger the number of elements, the larger the aperture of the array. The narrower the lobe, the higher the direction finding accuracy. The direction finding accuracy of this method is relatively low, and the application of modern direction finding systems is less; the phase direction finding method uses the phase difference information received by the antenna array for direction finding. Typical Multi-baseline phase interferometer direction finding, which uses multi-baselines to solve the contradiction between the unambiguous direction-finding range and direction-finding accuracy. The short baseline determines the unambiguous direction-finding range, and the direction-finding accuracy is inversely proportional to the length of the longest baseline, that is, The longer the baseline of the array, the higher the direction-finding accuracy. This method has relatively high direction-finding accuracy and is widely used in modern engineering; spatial spectrum estimation direction-finding uses modern spectrum estimation technology for direction-finding, and its direction-finding accuracy is the same as that of The array aperture is related. The larger the array aperture, the higher the direction finding accuracy. This type of method can theoretically achieve extremely high direction finding accuracy, but there are still many problems to be solved in the application of modern engineering, that is, there are few engineering applications;

[0004] The common feature of the direction finding methods of the above-mentioned radiation source signals is that the direction finding accuracy is closely related to the aperture size of the antenna array. To obtain high-precision direction finding results, the aperture of the array must be large enough, which also leads to the antenna of many modern radar electronic systems. getting bigger and bigger

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