Beidou/gps dual system low noise amplifier

Abstract

A Big Dipper / GPS double-system low-noise amplifier comprises an ultra wide band low-noise amplifying circuit and a double-passband band-pass balance filter circuit which are arranged in a same receiving system. The ultra wide band low-noise amplifying circuit simultaneously carries out low-noise amplification on Big Dipper / GPS satellite signals. The double-passband band-pass balance filter circuit restrains interference signals outside Big Dipper / GPS satellite signal frequency bands. The Big Dipper / GPS satellite signals through the low-noise amplification and filter enter a double-frequency-band gain continuous adjustment circuit, the gain of the amplifier can be continuously changed through the double-frequency-band gain continuous adjustment circuit, and it is guaranteed that the power level of Big Dipper signals and the power level of GPS signals meet the requirements of a receiver. The Big Dipper / GPS satellite signals passing through the double-frequency-band gain continuous adjustment circuit enter a frequency band gain proportion adjustment circuit, and the gain slope of a GPS frequency band and the gain slope of a Big Dipper frequency band are respectively adjusted in the frequency band gain proportion adjustment circuit. The Big Dipper / GPS satellite signals passing through the frequency band gain proportion adjustment circuit enter a wide frequency band driving and amplifying circuit to be driven and amplified.

Description

Technical field [0001] The invention relates to a low-noise amplifier, and is particularly suitable for a low-noise amplifier compatible with GPS and Beidou satellite signals. Background technique [0002] The working mode of Beidou / GPS combined with active and standby is a common application mode in the field of satellite navigation in my country. Because Beidou and GPS satellite navigation systems both transmit signals through satellites, the signals reaching the earth are relatively weak. At the same time, due to the difference in satellite elevation angles and the obstruction of trees and buildings, the signal strength to the ground will be lower. This brings certain difficulties to the application of satellite navigation systems. [0003] At present, the existing low-noise amplifiers on the market include a single Beidou low-noise amplifier and a single GPS low-noise amplifier. There has not yet been a low-noise amplifier compatible with Beidou and GPS satellite signal amplif...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the Beidou / GPS dual system receiver cannot share the low noise amplifier, and the long feeder receiver cannot share one feeder, the present invention provides a combination of the Beidou LNA and the GPS LNA, with single-port input , Beidou / GPS dual-system low-noise amplifier with single-port output

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