Antenna array direction-finding method for searching minimum amplitude vector angle

Abstract

An antenna array direction-finding method for searching the minimum amplitude vector angle belongs to the antenna array direction-finding category. An antenna array database is established, and an arrival direction which corresponds to an amplitude vector in a database making a minimum included angle with the amplitude vector of a real-timely received signal is searched and used as an estimated arrival direction value for the real-timely received signal. An arrival direction / amplitude vector database for an antenna array is first established; the amplitude vector of the real-timely received signal is then measured, and the included angles between the amplitude vector and all the amplitude vectors in the database of the antenna array are determined; finally, the amplitude vector in the database, which makes the minimum included angle with the amplitude vector of the signal real-timely received by the antenna array, is searched, and the arrival direction corresponding to the amplitude vector is the estimated arrival direction of the signal. The method does not need additional hardware and software to real-timely carry out phase correction, amplitude correction, mutual coupling correction and antenna position error correction on the antenna array, the direction-finding precision is high, the direction-finding error of the circular array comprising five whip antennas is probably less than 1 degree for signals with a frequency equal to 293MHz within the ultrashort wave frequency band, and the probability is larger than 97 percent.

Description

Technical field [0001] The invention belongs to the field of wireless reception, and relates to an antenna array direction finding method for a wireless signal receiving system, in particular to a method for estimating the arrival direction of a single signal by searching the minimum angle between the signal amplitude vector received by the antenna array in real time and the amplitude vector of the database provided by the antenna array Methods. Background technique [0002] The technology of using antenna array to find the direction of wireless signals has been widely used in radio monitoring, astronomy, sonar, geological exploration, earthquake, radar, wireless communication and other fields. According to the commonly used antenna array interferometer direction finding principle, it is necessary to perform phase correction, mutual coupling correction and antenna position error correction on the antennas in the antenna array, and to perform real-time phase consistency corre...

AI Technical Summary

Problems solved by technology

This method overcomes the influence of a considerable part of the phase correction error on the direction finding performance of the array and improves the direction finding accuracy, but it needs to use a fully synchronized sub-array to estimate the direction of the reference signal, and it is still affected by the mutual coupling effect between the antennas and the effect of antenna position error

Therefore, it is not suitable for antenna arrays with mutual coupling effects between antennas and antenna position errors

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