A Method for Sequentially Suppressing Multipath Signals Using Spatial Filtering for Single Antenna

Abstract

The invention relates to a method of a single antenna for suppressing multipath signals by using the sequence of spatial filtering, which comprises the steps of installing a group of metal plates on a grounding plate of the antenna along the radial direction in a central symmetric mode, wherein each two metal plates form a radial plate waveguide therebetween, and the radial plate waveguides are used for enabling TE surface waves to be transmitted therein in a cut-off mode attenuation mode; installing one or more half-open circular ring cavities with the central part being short circuited and being provided with 90-degree bending in a coaxial laminating mode at an outer ring close to the reverse side the grounding plate if the TE surface waves are restricted and cannot reach predetermined attenuation, a cavity opening forms high impedance upward so as to preventing formation and radiation of a wave mode; and arranging a group of slots or / and increasing a metal plate at a certain distance at the bottom part of the circular cavity along the radial direction at the circular ring cavity opening in order to further suppressing tail back lobes, and being capable of completely preventing formation and radiation of residual current on the ring through selecting the size and the number of the slots, the plate diameter and the interval. According to the invention, the antenna is enabled to have an ultra-high multipath resisting ability, and is small in size, light, high in reliability and low in cost.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method for sequentially suppressing multipath signals by using space filtering in a single antenna of a satellite navigation receiving terminal. Background technique [0002] The signals transmitted by navigation satellites include carrier waves, ranging codes and data codes, often called navigation messages. The receiver performs information processing on the navigation message and converts it into 7-dimensional information of position, speed and time to complete navigation and positioning and provide a time reference. In the application of high-precision GNSS, the positioning measurement accuracy is improved to the centimeter and sub-centimeter level, and its antenna is an indispensable key equipment for the receiver, which plays a key role in improving the carrier phase measurement accuracy of GNSS. [0003] Due to the existence of multipath, the signal arriv...

AI Technical Summary

Problems solved by technology

This mechanism of action is related to frequency, and the effect of further expanding the frequency band or further improving the suppression ability is not ideal.

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