Multimode navigational radio frequency chip

Abstract

The invention relates to a multimode navigational radio frequency chip which has the technical characteristics that a MCU (Microprogrammed Control Unit) are respectively connected with frequency selection signal ports S0 and S1 of the chip by two input interfaces; the MCU are respectively connected to a charge pump frequency synthesizer and one input end of an automatic gain controller by two output interfaces; the input end of the charge pump frequency synthesizer is connected with a P counter; a low noise amplifier is connected with an RF_IN port of the chip; the low noise amplifier is connected onto a variable gain amplifier by two output signals which are filtered and output by an off-chip band-pass filter through a frequency mixer; and the output end of the variable gain amplifier is output onto output ports AD0, AD1, AD2 and AD3 of the chip by an on-chip band-pass filter and an analog to digital converter. The multimode navigational radio frequency chip has reasonable design. The high-quality down-conversion scheme can be implemented for any one navigation signal under the frequency of B1 and at the frequency point of GPS (Global Positioning System) L1 in any environment and the satisfied bandwidth is obtained. The multimode navigational radio frequency chip has the characteristics of simple structure, stable performance, powerful functions, low cost and the like.

Description

technical field [0001] The invention belongs to the field of radio frequency integrated circuits, in particular to a multi-mode navigation radio frequency chip. Background technique [0002] At present, GPS-based satellite navigation systems and Beidou satellite navigation systems are more and more widely used. Users can use satellite navigation receivers to receive satellite signals and realize navigation functions. Existing satellite navigation receivers rely on weak radio frequency satellite signals to work. The satellite navigation signal frequency is B1(1561.098±2.046)MHz, L1 frequency point: (1575.42±1.023)MHz, input receiving level:- 110dBm~-65dBm, the satellite navigation signal is susceptible to interference, destroying the integrity of the satellite signal, resulting in the reduction of navigation accuracy, so that the accurate positioning function cannot be realized. Satellite navigation receivers usually set a radio frequency front-end chip to amplify and proces...

AI Technical Summary

Problems solved by technology

Existing satellite navigation receivers rely on weak radio frequency satellite signals to work. The satellite navigation signal frequency is B1(1561.098±2.046)MHz, L1 frequency point: (1575.42±1.023)MHz, input receiving level:- 110dBm~-65dBm, the satellite navigation signal is easily interfered, destroying the integrity of the satellite signal, resulting in the reduction of navigation accuracy, so that the accurate positioning function cannot be realized

Satellite navigation receivers are usually equipped with a radio frequency front-end chip to amplify and process satellite radio frequency signals. The existing radio frequency front-end chips need to process satellite radio frequency signals of different satellite systems, which have problems such as complex structure, high power consumption, and poor consistency. Meeting the needs of satellite navigation receivers

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