Circular array phase position interferometer broadband instantaneous direction finding method based on table lookup method

Abstract

The invention belongs to the technical field of communication radars, and provides a circular array phase position interferometer broadband instantaneous direction finding method based on a table lookup method. The circular array phase position interferometer broadband instantaneous direction finding method based on the table lookup method specifically includes the following steps: building a lookup table, traversing all phase differences in a range of (-pi, pi] at an interval of 2pi / (2L-1), and constructing a phase difference combination; performing ambiguity resolution calculation on all the phase differences so as to obtain a phase ambiguity number; constructing tabular value, and building another lookup table; obtaining measuring value of the phase differences through phase demodulation system measurement, performing table lookup and calculation so as to obtain corresponding tabular value and resolving the corresponding tabular value into a corresponding ambiguity number, and calculating a true phase difference; calculating a pitch angle and an azimuth angle of a wave incoming direction according to the wavelength output by a frequency system and the true phase difference. The circular array phase position interferometer broadband instantaneous direction finding method based on the table lookup method uses the table lookup method to solve ambiguity, avoids tedious calculation of formula ambiguity resolution, greatly shortens direction finding time, can shorten the direction finding time from ten milliseconds into hundred nanoseconds, and adapts to real time application.

Description

technical field [0001] The invention belongs to the technical field of communication radar, in particular to a wideband instantaneous direction finding method based on a circular array phase interferometer system in radio monitoring. Background technique [0002] Radio direction finding refers to measuring the position of the target radiation source, which is widely used in civil and military fields, such as mobile communication, radar, sonar, etc. Compared with other direction finding methods, phase interferometer has the advantages of simple structure, easy implementation and high maturity. For two-dimensional direction finding, the circular array can reduce the size of the array compared with other formations, and it is easy to combine other devices. [0003] The core of interferometer direction finding is to resolve phase ambiguity. The algorithm for circular array defuzzification is slightly more complicated than that of linear array, and generally involves cluster ana...

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Problems solved by technology

Another scholar proposed a clustering defuzzification method that does not require a threshold (see literature: Wang Qi. Research on Direction Finding of Circular Array Interferometer [J]. Aerospace Electronic Countermeasures, 2009, 25(5): 33-35). Although it is robust, it requires a large amount of calculation for defuzzification, a long period of direction finding, and is not real-time

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