Direction finding method for three-channel spatial spectrum estimation direction finding system

Abstract

The invention discloses a direction finding method for a three-channel spatial spectrum estimation direction finding system. The system comprises a direction finding antenna array, three common-frequency multi-channel receivers and a direction finding algorithm processor, wherein the direction finding antenna array is a 9-element uniform circular array and is provided with an antenna select switch for selecting different antenna elements in the antenna array; three antennas are selected by the antenna select switch each time, wherein the No. 1 antenna is required to be selected each time; 1, 2 and 9, 1, 3 and 8, 1, 4 and 7, and 1, 5 and 6 are selected, wherein each number represents the number of the selected antenna, and the four groups of antennas are alternately selected; the direction finding receivers are of three-channel; and three antennas selected by the antenna switch each time are connected with the three common-frequency multi-channel receivers respectively. By researching the spatial spectrum estimation direction finding technology and improving an MUSIC direction finding algorithm, receiving channels are reduced under the condition of not reducing the antenna elements; meanwhile, the direction finding performance is guaranteed to be unchanged; and the aims of lowering the cost of the direction finding equipment and improving the reliability of the equipment are fulfilled.

Description

technical field [0001] The invention relates to a space spectrum estimation and direction finding system, in particular to a direction finding method for a three-channel space spectrum estimation and direction finding system. Background technique [0002] Spatial spectrum estimation direction finding technology is a new direction finding method different from the traditional amplitude direction finding method and phase direction finding method. It was developed on the basis of classical spectrum estimation theory in the past 30 years. The antenna array is a new type of direction finding technology based on modern digital signal processing technology. Basic principle of space spectrum estimation and direction finding technology: the whole space spectrum estimation and direction finding equipment is composed of three parts, namely direction finding antenna array, same frequency multi-channel receiver and direction finding algorithm processor. The direction-finding antenna arr...

AI Technical Summary

Problems solved by technology

[0003] The existing spatial spectrum direction-finding technology determines that the direction-finding equipment is complex and costly. Generally, the number of antenna elements is 8 or 9, and the same number of receiving channels is required. These channels are not simply accumulated by multiple receivers. Coherent receiving channels, and the amplitude and phase of each channel are required to be consistent. These requirements greatly increase the cost of the equipment and reduce the reliability. These factors directly affect the popularization and application of spatial spectrum estimation and direction finding technology in actual engineering.

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