Radio frequency integrated GPS active antenna

Abstract

The invention, belonging to radio frequency communication technical field, provides an integrated RF GPS active antenna, aiming at solving the problems that the GPS receivers of current active antennas are difficult to miniaturize, the modules are complex in connection and low in receiving sensitivity, which influences initial positioning time and positioning precision. The technical proposal of the invention adopts an integrated RF GPS active antenna; a GPS active antenna is optimized, and impedances are matched between the component parts, interconnected losses are reduced; total noise index is reduced and the receiving sensitivity of the GPS positioning device is improved, thus the initial positioning time and precision of the GPS positioning device are remarkably improved. The integrated RF GPS active antenna is easy to be miniaturized and is particularly suitable to be integrated with the functional module of mobile communication equipment such as mobile phone and PDA.

Description

Contents of the invention [0001] The invention belongs to the technical field of radio frequency communication, and relates to an active antenna, in particular to a radio frequency integrated GPS active antenna. The small active antenna is equipped with a GPS digital sampling signal output terminal. Background technique [0002] The GPS satellite navigation system can provide position, speed and time information, which can be used to locate, navigate and monitor various targets. It is omnipotent (land, ocean, aviation and aerospace), global, all-weather, continuous and real-time It plays an important role that cannot be replaced by other means in the construction of information, transportation, security and defense, agriculture, fishery, disaster prevention and relief, and environmental monitoring. Its development prospects are very broad, and it has attracted more and more attention in recent years. [0003] The technological progress of miniaturization, high precision and ...

AI Technical Summary

Problems solved by technology

There are many shortcomings in the structural composition scheme of the traditional GPS receiver: first, the traditional design, the active antenna and the GPS RF front-end chip are two independent modules, and the signal sent by the active antenna module to the GPS RF front-end module is a radio frequency signal. The connection between the two needs to be considered during design, especially the impedance matching between the input and output interfaces and the cable. Due to the complex characteristics of the cable and the dedicated SMA connector for connection, and the special connection requirements between the two modules, the matching is difficult and increases the Complexity of Modular Design

Second, the connection lines between the two modules of the active antenna and the GPS RF front-end chip of the traditional structure scheme are relatively long, so that the processing and transmission of the RF signal will introduce additional noise

Third, the impedance matching between the active antenna and the GPS RF front-end RF modules is low, which will cause a large signal attenuation and reduce the total noise index of the system

Fourth, the traditional active antenna and the RF front-end chip are connected to the baseband processing chip through a cable, and the signal output to the GPS baseband processing chip is an analog signal, and the connection cable transmission is susceptible to interference, so the transmission distance cannot be very long

Fifth, the poor conduction performance between the traditional active antenna, the RF front-end chip and the baseband processing chip leads to a decrease in the signal-to-noise ratio of the GPS receiver system, and ultimately reduces the receiving sensitivity of the GPS navigation and positioning equipment, directly affecting the first positioning time of the system performance (including the time required for cold start and hot start) and positioning accuracy

Sixth, the active antenna module and the GPS RF front-end chip module are integrated independently, and the additional chip area and space occupied are not easy to meet the miniaturization requirements

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