Radio frequency front-end circuit of L1-L2 dual-band satellite navigation receiver

Abstract

Disclosed in the invention is a radio frequency front-end circuit of an L1-L2 dual-band satellite navigation receiver. The radio frequency front-end circuit is composed of a radio frequency low-noise amplifier, a first-stage mixer, a second-stage mixer, a low-pass filter, a configurable complex band-pass filter, a variable-gain intermediate-frequency amplifier, an analog-digital converter, a frequency synthesizer and an eight-frequency divider. The circuit is capable of receiving dual-band satellite signals like GPS L1 and L2 signals, Beidou B1 and B2 signals, Glonass L1 and L2 signals; and demands of high-precision dual-band satellite positioning and navigation can be satisfied. Meanwhile, the circuit is characterized in that the circuit structure of the traditional dual-band receiver is simplified and simultaneous receiving of dual-band signals can be realized only by using one frequency synthesizer; single-antenna inputting is supported and image rejection by using an off-chip radio frequency unit and an intermediate-frequency filter is not needed, so that the power consumption and cost of the receiver radio frequency front-end circuit can be effectively reduced. Therefore, the provided circuit has the great industrial value in use.

Description

technical field [0001] The invention belongs to the field of wireless communication chip design, and in particular relates to a radio frequency front-end circuit of a satellite navigation receiver. Background technique [0002] The global satellite navigation system (GNSS) can provide users with accurate position, speed, and time information. It has the characteristics of all-weather, global, real-time, and high-precision, so it has developed rapidly in recent years. At present, global satellite navigation systems mainly include the Global Positioning System (GPS) of the United States, the Glonass system (Glonass) of Russia, the Galileo system (Galileo) of the European Union and the Beidou System (BDS) of China. The satellites of each system can transmit satellite signals of multiple carrier frequencies to the ground at the same time. Added satellite signals in the L5 (1176.45MHz) frequency band; Glonass satellites simultaneously transmit L1 (1602MHz) and L2 (1246MHz) two-f...

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to realize the function of not using off-chip radio frequency, intermediate frequency filter and supporting single antenna input on the basis of receiving L1 and L2 dual-band satellite navigation signals at the same time, and solve the problems of complex structure, high cost and power failure of existing circuits. Big problem

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