A Direction Finding and Positioning System Combining Phase Difference Direction Finding and Space Spectrum Direction Finding

Abstract

The invention discloses a phase difference direction finding and spatial spectrum direction finding combined direction-finding positioning system. Direction-finding positioning is carried out aiming at radio-frequency signals received by a N-element uniform circular array, wherein N refers to an odd number larger than or equal to 5; two parallel baseline groups in the circular array are selected to acquire N-1 array element pairs, and each array element pair corresponds to one phase discriminator; the radio-frequency signals received by the nth array element are received by a nth receiving channel and enter a signal-to-noise-ratio estimator through a nth analog-digital converter to realize signal-to-noise-ratio estimation; the signal-to-noise-ratio estimator leads out N output ends; each output end generates a first branch and a second branch, each output end is connected with one of the branches each time, each first branch is connected to a spatial spectrum beam former, and each second branch is connected to the phase discriminator corresponding to the array element of the radio-frequency signals; an output end of each phase discriminator is connected to a spatial phase interferometer. By combination of the two incompatible methods including phase difference direction finding and spatial spectrum direction finding, high-precision combined direction-finding positioning can be realized on a same platform.

Description

technical field [0001] The invention belongs to the field of direction finding of spaceborne, airborne and missile seekers, and in particular relates to a direction finding and positioning system combining phase difference direction finding and space spectrum direction finding. Background technique [0002] In the field of direction finding such as spaceborne, airborne and missile seekers, there are generally two methods that can be used for direction finding, phase difference interferometer direction finding and space spectrum direction finding. [0003] The phase interferometer is widely used in spaceborne, airborne and missile seeker fields, etc., and can realize passive detection and positioning of space radiation sources. The advantage of this system is that it has high positioning accuracy under the condition of high signal-to-noise ratio. , The positioning time is short, and its disadvantage is that under the condition of low signal-to-noise ratio, the positioning acc...

AI Technical Summary

Problems solved by technology

[0003] The phase interferometer is widely used in spaceborne, airborne and missile seeker fields, etc., and can realize passive detection and positioning of space radiation sources. The advantage of this system is that it has high positioning accuracy under the condition of high signal-to-noise ratio. , the positioning time is short, and its disadvantage is that under the condition of low signal-to-noise ratio, the positioning accuracy is very poor, and the positioning time is very long, which cannot meet the reconnaissance needs of key targets on the battlefield

[0004] Compared with the phase interferometer system, the spatial spectrum direction finding still has good direction finding positioning accuracy and short positioning time under the condition of low signal-to-noise ratio, and has stronger adaptability to complex electromagnetic environments, especially for single-station spaceborne electronic The reconnaissance payload can only receive the sidelobe signal of the target radiation source, so the signal-to-noise ratio is low, which is more suitable for the use of the array direction finding system, but the disadvantage of this system is that the calculation complexity is high, and the real-time requirements are relatively high. In terms of high application background, high requirements are placed on the design of load structure

[0005] At present, two different direction finding and positioning systems are not compatible, and they are used on their respective platforms. Since the two methods have their own advantages and disadvantages, they cannot complement each other. Therefore, when performing direction finding and positioning, the existing technology has high cost and low power consumption. , and is not flexible enough to meet the ability to deal with complex electromagnetic environments under the background of tactical applications such as "quick response"

Images