DSP-based multi-system compatible GNSS receiver and receiving system thereof

Abstract

The invention provides a DSP (digital signal processor)-based multi-system compatible GNSS (global navigation satellite system) receiver and a receiving system thereof, and aims to solve the problem of coverage blank of a single system. An all-frequency-point antenna receives a satellite signal of a navigation system and sends the satellite signal into a radio frequency unit; after the satellite signal is subjected to band-pass pre-filtering and low-noise amplification in the radio frequency unit, the satellite signal and a sine intrinsic signal generated by a local oscillator are mixed to realize down conversion to obtain an intermediate frequency signal; finally, an analog intermediate frequency signal is converted into a digital intermediate signal through an analog-digital converter, and the digital intermediate signal is sent into a base-band processing unit; the base-band processing unit carries out capturing and tracking on the digital intermediate signal output by the radio frequency module so as to obtain a Doppler observed quantity; besides, the digital intermediate signal is subjected to demodulation and dispreading, so that original navigation telegraph texts are acquired from the digital intermediate signal, and a pseudo range observed quantity is obtained; a positioning resolving unit is used for obtaining pseudo-range, Doppler and telegraph text parameter information for positioning and resolving, and after resolving, a positioning speed measurement result is sent to a user.

Description

technical field [0001] The present invention relates to GNSS (Global Navigation Satellite System, Global Navigation Satellite System) receiver design technology, more specifically, to a DSP-based multi-system compatible GNSS receiver and its receiving system. Background technique [0002] The global navigation satellite system can provide all-weather and all-time position, speed and timing information services for various users on the earth's surface and near-earth space, and plays an important role in daily life, transportation, economic development, national defense construction and other fields . Since the beginning of the 21st century, the global satellite navigation and positioning system has developed rapidly. At present, GPS, GLONASS and China's Beidou (BDS) three major navigation systems are compatible and shared. [0003] For multi-system compatible receivers, it has the advantages of large number of available satellites, good coverage, high positioning accuracy, a...

AI Technical Summary

Problems solved by technology

[0005] The present invention proposes a DSP-based multi-system compatible GNSS receiver and its receiving system, which solves the coverage gap problem existing in a single system, and significantly improves the reliability and integrity of the system, making up for the number of visible satellites in a single constellation positioning Few, poor geometric distribution of satellites, and low positioning accuracy

Images