GNSS (global navigation satellite system) receiver and intermediate frequency data processing method thereof

Abstract

The invention discloses a GNSS receiver and an intermediate frequency data processing method thereof, and belongs to the technical filed of receivers for a GNSS. The GNSS receiver comprises five parts, namely, an intermediate frequency data compression part, an intermediate frequency data storage part, an intermediate frequency data reading part, an intermediate frequency data uncompression part and an intermediate frequency data processing part. A GNSS radio signal is required to be transmitted through the atmospheric layer, the strength of the signal reaching the ground is very weak; the GNSS receiver needs to process intermediate frequency data which are long enough, so that a satellite signal can be searched; and a method combing GNSS intermediate frequency data storage and parallel signal processing is adopted, so that the time for searching the satellite signal can be greatly reduced. However, intermediate frequency data can occupy lager storage circuits, and thus the application of the method in actual practice is restricted. According to the GNSS receiver and the intermediate frequency data processing method, the intermediate frequency data are compressed and uncompressed, so that the storage size of the intermediate frequency data can be decreased, and the cost and the energy consumption of the whole GNSS receiver are reduced.

Description

technical field [0001] The invention relates to the technical field of receivers of a Global Navigation Satellite System (GNSS), in particular to a GNSS receiver and an intermediate frequency data processing method thereof. Background technique [0002] Global Navigation Satellite System is a collective term for all global navigation satellite systems and their augmentation systems. It is an all-weather radio navigation system covering the whole world established by using all navigation satellites in the world. At present, GNSS includes GPS of the United States, GLONASS of Russia, COMPASS (BeiDou) of China, GALILEO system of the European Union, SBAS wide-area differential system, DORIS space-borne Doppler radio orbit determination system, QZSS quasi-zenith satellite system, GAGAN GPS Geostationary Satellite Augmentation System, etc., the number of available satellites reaches more than 100. The following is an introduction to the four main GNSS systems. [0003] 1.GPS syst...

AI Technical Summary

Problems solved by technology

The method of pre-storing IF data and then processing it quickly has many advantages, but due to the large amount of data stored in IF signals, a large memory is often required. For mobile devices, especially consumer electronics, cost and power consumption are the most sensitive Two indicators, large-capacity memory will inevitably bring about an increase in cost and power consumption

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