Intermediate frequency data acquisition and playback system in GNSS (global navigation satellite system) receiver

Abstract

The invention relates to an intermediate frequency data acquisition and playback system in a GNSS (global navigation satellite system) receiver. An antenna is connected with a radio frequency front-end unit, an SPI (single-point imaging) module is in two-way connection with the radio frequency front-end unit, the radio frequency front-end unit is connected with an FPGA (field-programmable gate array) control unit is in two-way connection with a USB (universal serial bus) interface transmission unit, and the USB interface transmission unit is in two-way connection with an upper computer; the radio frequency front-end unit is used for receiving satellite signals and outputting intermediate frequency signals, the SPI module is used for configuring the working mode of the radio frequency front-end unit and performing switching among a plurality of satellite navigation systems, the FPGA control unit is used for performing series-parallel conversion on the intermediate frequency signals and then saving the intermediate frequency signals into an asynchronous FIFO (first in first out) buffer module, a USB interface time sequence module is used for reading out data stored in the FIFO buffer module and then writing the data into the USB interface transmission unit, and the upper computer is used for storing the data which is red from the USB interface transmission unit into a local hard disc. A data stream after format conversion is transmitted into the intermediate frequency input end of a base band under the trigger of a base band clock through the control of the upper computer during the playback of the data.

Description

technical field [0001] The invention relates to a GNSS satellite navigation system, in particular to an intermediate frequency data collection and playback system for a GNSS receiver, and is especially suitable for research and development of receivers based on multi-mode GNSS satellite navigation systems. Background technique [0002] With the completion and improvement of various navigation satellite systems around the world, satellite navigation and positioning receivers are widely used, from a single GPS era to a new era of multi-constellation coexistence and compatibility with GNSS, leading to the globalization of satellite navigation systems and enhanced multi-mode. The gradual improvement and enhancement of the GNSS system has made compatibility and interoperability one of the new focuses, and how to make full use of the advantages of multiple systems from an optimal perspective is a trend in future development. The GNSS receiver based on software radio technology has...

AI Technical Summary

Problems solved by technology

In the debugging of the receiver, we need a continuous satellite data stream that meets the baseband requirements, and the realization of the data playback function solves the problem of having to go outdoors for debugging, making the algorithm development and debugging of the receiver only need One-time open-air data collection, and all follow-up can be carried out indoors, which improves development efficiency and shortens development time

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