Low-cost four-point coupled feeding full-band high-precision navigation antenna

Abstract

The embodiment of the invention discloses a low-cost four-point coupled feeding full-band high-precision navigation antenna, which comprises an antenna bottom plate, a combining circuit, a radiation sheet, a coupled feeding sheet and a support column, and is characterized in that the combining circuit adopts four-point feeding; the number of the coupling feed sheets is four, all the coupling feed sheets penetrate through the antenna bottom plate to be welded and feed, the coupling feed sheets are correspondingly connected with the combining circuits respectively, and the coupling feed sheets are inverted-L-shaped. The radiation sheet is located above the antenna bottom plate and is spaced from the antenna bottom plate by a preset distance; and one end of each supporting column is fixed on the antenna bottom plate, and the other end of each supporting column is fixedly connected with the radiation sheet. According to the invention, air is used as a medium in coupled feeding, the bandwidth requirement of a full frequency band is met, a large-thickness high-frequency plate is not needed, the cost is low, separated feeding of a high frequency band and a low frequency band is not needed, and a feeding network is simple; the low elevation angle axial ratio and the phase precision are good, the positioning dotting precision meets the requirement, and the antenna is suitable for scenes such as a CORS station requiring high antenna phase precision.

Description

technical field [0001] The invention relates to the technical field of positioning and navigation, in particular to a low-cost four-point coupled feeding full-frequency high-precision navigation antenna. Background technique [0002] The global satellite navigation system refers to a space-based radio navigation and positioning system that can provide users with all-weather 3-dimensional coordinates, speed and time information at any place on the earth's surface or in near-earth space. The principle is that the distance measurement between the satellite and the user is based on The difference between the launch time of the satellite signal and the arrival time at the receiver is called the pseudo-range. In order to calculate the user's three-dimensional position and the receiver clock deviation, the pseudo-range measurement requires receiving signals from at least 4 satellites. With the development of global integration, satellite navigation systems are used in various field...

AI Technical Summary

Problems solved by technology

The disadvantages of this design scheme are: 1. In order to meet the bandwidth requirements, it is necessary to use large-thickness high-frequency plates to make antennas, and the cost is high

2. The high-frequency band and the low-frequency band are fed separately, and the feed network is complex

This type of antenna has a wide bandwidth and the working frequency range is 1.175GHz -1.607GHZ, but the low elevation ratio and poor phase accuracy lead to insufficient positioning accuracy, and cannot be used in CORS stations and other scenarios that require high antenna phase accuracy

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