Rotary type vehicle-mounted antenna for Big Dipper navigation system

Abstract

The invention provides a rotary type vehicle-mounted antenna for a Big Dipper navigation system and relates to a dipole antenna. The rotary type vehicle mounted antenna is provided with four pairs of dipole arms, a support bracket and a coaxial feed cable metallic reflection plate, wherein the four pairs of dipole arms are divided into two groups; the front end of each group of rotary type dipolearms is provided with feeding points; a feed cable is provided with internal and external leads; the feeding points of positive arms are connected with the internal lead, and the feeding points of negative arms are connected with a coaxial-cable outer conductor; the feeding points in each group of dipole arms are arranged in the same plane; angles of elevation are formed by four dipole arms and the plane; a distance exists among planes in which the feeding points are arranged and the distance also exists between the planes and a ground plane; the two groups of rotary type dipoles are used forreceiving and transmitting Big Dipper signals respectively; the internal lead is connected with a vehicle-mounted navigation system and the external lead is connected with the reflection plate; and the reflection plate is fixed on a vehicle body. The vehicle-mounted antenna has the advantages of good gain performance, large bandwidth, low return loss and omnidirectional radiation characteristic; in addition, the transmitting signal frequency can cover 1600+ / -100MHz, and the receiving signal frequency can cover 2500+ / -80MHz.

Description

technical field [0001] The invention relates to a dipole antenna, in particular to a rotary symmetrical double dipole vehicle-mounted antenna for a satellite navigation and positioning system. Background technique [0002] In 2000, my country launched two Beidou navigation test satellites, built the Beidou satellite navigation test system, and solved the problem of whether the satellite navigation system exists. In 2004, the construction of the Beidou satellite navigation system was launched, and for the first time, it began to develop and produce satellites and launch vehicles in batches, launch them in intensive networks, and explore a new development model for the aerospace industry. Due to the service characteristics of combining navigation and communication, the test system has gradually been recognized by domestic users after several years of development, and has been applied in many fields such as fishery, transportation, electric power and national security, especial...

AI Technical Summary

Problems solved by technology

[0005] At present, the antennas commonly used in navigation and positioning systems have a narrow working frequency band, and most of them are based on the single mode of the American GPS navigation system, which leads to hidden dangers in timing and communication security.

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