Space-borne high-precision navigation and positioning antenna

Abstract

The invention relates to a satellite-borne high-precision navigation positioning antenna. The antenna is composed of an upper layer radiation piece, a lower layer radiation piece, a support column, afeed probe, a feed network, a medium support, a choking coil and an RF connector. The upper layer radiating piece and the lower layer radiation piece are mounted on the support column. The support column is fixed on the geometric center of the choking coil by screws. The feed probe performs coupled feeding on the upper layer radiating piece and the lower layer radiating piece, to make the antennahave relatively wide working band. The feed network generates four paths of equal-amplitude electrical signals whose phase difference is 90 DEG in sequence, ensuring the antenna has high phase centerstability. The medium support is used to ensure the verticality and structural strength of the four feed probes. The choking coil structure makes a directional diagram have ideal front-to-back ratio and be adapted to various installation platforms. The whole antenna is novel and simple in structure, and has good impact resistance, vibration resistance, radiation resistance and thermal stress resistance. The antenna has characteristics of wide frequency band, high gain and high phase center stability.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to the technical field of satellite-borne navigation antennas with wide frequency band, circular polarization, high phase stability and anti-multipath. Background technique [0002] Existing dual-frequency navigation antennas mostly adopt the form of four-feed double-layer dielectric board microstrip antenna, such as the patent "anti-multipath multi-feed multi-band wide beam high stability circularly polarized microstrip antenna" (application number: CN201220432444. 9) and the patent "A high-precision measurement GNSS antenna" (application number: CN201520555206.0). This type of antenna is composed of a two-layer dielectric plate radiation structure, and its operating frequency band is narrow, which cannot meet the requirements of a multi-mode compatible navigation system; at the same time, the microwave dielectric plate does not have high and low temperature ± 90 ° use characteris...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the defects that the existing high-precision positioning antenna cannot meet the broadband and low-profile characteristics, and does not have the ability to resist radiation, vibration, and impact, the present invention proposes a space-borne high-precision navigation and positioning antenna

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