A receiver for receiving a plurality of GNSS (global navigation satellite system) signals

Abstract

A receiver for receiving a plurality of GNSS (global navigation satellite system) signals is arranged to receive a plurality of global navigation satellite system (GNSS) signals from up to four different satellite navigation systems including a GLONASS system, a BeiDou system, a GPS system, and a Galileo system. Received GNSS signals are mixed with a first local frequency signal to generate a plurality of mixed signals. The mixed signals are processed in up to three parallel branches. In a first branch, a first portion of the mixed signals are transformed by passing the first portion through a band-pass filter having a bandwidth between about 0 MHz and 46 MHz and by amplifying the filtered signals with an AGC circuit. In a second branch, a second portion of the mixed signals are transformed by rejecting image signals of the second portion with an image rejection filter and mixing image rejection filter output signals with a second local frequency signal to derive first remixed signals. In a third branch, a third portion of the mixed signals are transformed by adjusting a phase of the third portion to overlap a band of the first remixed signals. The adjusted third portion of the mixed signals and the first remixed signals are concurrently band pass filtered with a low IF filter.

Description

technical field [0001] The present description relates to techniques for receiving Global Navigation Satellite System (GNSS) signals according to a plurality of standards, the GNSS signals including at least a first GNSS signal corresponding to a first frequency of the "Russian Global Navigation Satellite System" (GLONASS) center frequency and a corresponding A second GNSS signal at a second frequency of the BeiDou center frequency, the receiver includes a signal for mixing the plurality of GNSS signals with a local signal at a local oscillator frequency to generate a corresponding multiple A mixer for the mixed signal and the low-IF section. [0002] Various embodiments may be applied, for example, to GNSS receivers capable of processing all GNSS signals of the L1 frequency band (1550-1610 MHz). Background technique [0003] Global Navigation Satellite System (GNSS) performs better when receiving signals from many satellites simultaneously: the number of available satellit...

AI Technical Summary

Problems solved by technology

While all these blocks are easily feasible using silicon technology with mediocre performance, however, since the upper frequencies of the filters are only about 6MHz and 10MHz, and the ADC must be run at a lower sample frequency than the previously described zero-IF solution , so the result is very expensive in terms of hardware resources and power consumption

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