Direction finding method capable of suppressing phase error of uniform distribution

Abstract

The invention provides a direction finding method capable of suppressing a phase error of uniform distribution. The method comprises the steps of (1) carrying out initialization processing of an array, (2) determining a discrete value set of an azimuth angle and a pitch angle of a signal and a corresponding steering vector set, (3) determining a time domain sampling vector of an array receiving signal, (4) determining a phase difference vector of each steering vector in the steering vector set and the time domain sampling vector and determining an entropy corresponding to each steering vector by the phase difference vector, and (5) determining a direction of the arrival of a signal. According to the method, a direction searching function of direction finding is established according to a minimum entropy criterion of uniform distribution, the influence of the phase error of uniform distribution on direction finding is suppressed, and thus the precision of direction is better than an interferometer direction finding method without considering the phase error.

Description

technical field [0001] The invention relates to a direction finding method capable of suppressing uniformly distributed phase errors. Background technique [0002] Array signal processing technology can be used to process the signals received by the array, so as to determine the direction of arrival of multiple signals (referred to as direction finding), and has a wide range of applications in the fields of radar, sonar, communication systems, and smart antennas. [0003] Among the various existing direction-finding methods, the direction-finding method of the ratio-amplitude method has large direction-finding errors due to the polarization of the received signal, wavefront distortion, etc., and its application is greatly limited, while the direction-finding method of the interferometer The method is insensitive to the polarization and wavefront distortion of the received signal, and has high direction finding sensitivity, which has been widely used. However, in practical a...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a direction-finding method that can suppress uniformly distributed phase errors, and solve the problem that in practical applications, the interferometer direction-finding method is often affected by phase errors, that is, the phase value calculated by the received signal and There is a direction-independent error between the phase values ​​corresponding to the real signal direction, which leads to an increase in the direction-finding error, and even the problem that a reliable direction-finding function cannot be realized

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