Large-baseline four-element array broadband signal direction finding system and method

Abstract

The invention discloses a large-baseline four-element array broadband signal direction finding system and method, and used for performing direction finding of far-field radiation sources. The system and method includes two portions: a direction finding processing front end and a direction finding processing method. The direction finding processing front end outputs four-channel signals, and signal phase parameters are constrained by relative positions of the radiation source and the direction finding processing front end and the antenna geometric configuration. The direction finding processing method specifically includes steps: firstly, in a phase estimation module, phase resolution of intermediate frequency signals of the direction finding processing front end is performed; the phase difference is solved by an unwrapping module and an ambiguity resolution module by employing the gradually-changed baseline wavelength ratio characteristic caused by broadband signals; and finally the direction and the position of the radiation source are estimated in a direction finding module with the combination of the antenna geometric configuration. According to the system and method, the large baseline with a fixed dimension is employed, two-dimensional instantaneous direction finding of a non-cooperative target radiation source can be accomplished only by the four-element array antenna, the direction finding precision of the system is not reduced, the engineering realization complexity of the direction finding system is simplified, and the development space and the application prospect are wide.

Description

technical field [0001] The invention relates to a direction finding system and method for a large-baseline four-element array broadband signal, which is especially suitable for occasions where the complexity of the direction finding system is high, and can be used for direction finding of non-cooperative target radiation sources, and belongs to electronic reconnaissance field. Background technique [0002] The direction finding system is an important part of the electronic reconnaissance equipment system, which can intercept, analyze, and locate target radiation sources in the combat area, and "plays" an extremely important role in modern electronic countermeasures. The direction finding system mainly includes two modes: multi-station and single-station. Multi-station direction-finding requires high-precision time synchronization and communication links among multiple stations. There are two forms of direction finding and interferometer direction finding. The accuracy of th...

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Problems solved by technology

[0003] The problem solved by the technology of the present invention is: it solves the problem that the traditional interferometer direction finding system has many channels and the engineering is complicated. It only needs four-element array antennas to form a large baseline "ten" array to measure two-dimensional direction in space, and it has instantaneous positioning. ability

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