A short-time large-aperture high-precision direction finding method for virtual synthesis of uniform linear arrays

Abstract

The invention discloses a short-time large-aperture high-precision direction finding method for virtual synthesis of a uniform linear array. The specific steps are as follows: a high-speed switch logic driver is used to drive a high-speed switch, and Δt is used as the high-speed switch conversion time, and each antenna is switched on by round-robin switching. The received data of each antenna array element is obtained cyclically; the phase compensation calibration and amplitude equalization control are performed on the received data of each antenna array element to form a virtual short-term large aperture, and the obtained data based on the virtual short-term large aperture is obtained. The sampling data obtained by the aperture; the sampling data obtained based on the virtual short-term large aperture is down-converted and digitally processed; the invention is based on a uniform linear array, and uses a high-speed switch to switch on each antenna array element in turn, and after phase compensation Calibration and amplitude equalization control, virtual formation of short-term large aperture, and sampling data obtained by virtual short-term large aperture, through signal processing to achieve high-precision direction finding.

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 short-time large-aperture high-precision direction finding method for virtual synthesis of a uniform linear array. 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. Methods such as method direction finding and spatial spectrum estimation direction finding. [0003] Amplitude method direction finding is to use the received signal amplitude information for direction finding. Its 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 array elements, the larger the aperture of the array. The ...

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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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