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Global navigation satellite system (GNSS) receiver system based on delay locked loop (DLL)-Rake tracking loop

A tracking loop and receiver technology, applied in the field of positioning and navigation, can solve the problems that Rake technology has not been applied, and achieve the effect of increasing speed, removing influence, and reducing measurement error

Inactive Publication Date: 2011-09-07
张淑芳 +4
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the great difference between the communication system receiver and the GNSS receiver, Rake technology has not been applied in the GNSS receiver system

Method used

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  • Global navigation satellite system (GNSS) receiver system based on delay locked loop (DLL)-Rake tracking loop
  • Global navigation satellite system (GNSS) receiver system based on delay locked loop (DLL)-Rake tracking loop
  • Global navigation satellite system (GNSS) receiver system based on delay locked loop (DLL)-Rake tracking loop

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Embodiment Construction

[0012] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0013] Such as figure 1 As shown, the present invention is based on the GNSS receiver system of the DLL-Rake tracking loop, including a baseband processing chip module 1 and a GNSS radio frequency processing chip module 2, and the baseband processing chip module 1 is realized by an FPGA chip, including 12 channels of correlation Correlator module 3 and MicroBlaze soft-core processor module 4, correlator module 3 is made up of DLL-Rake tracking loop, and correlator module 3 of each channel all reads GNSS digital intermediate frequency signal from GNSS radio frequency processing chip module 2; Correlator Module 3 uses Rake technology to divide the correlator of each channel into two branches. The specific structure is as follows figure 2 shown. figure 2 Inside the correlator in Branch 6 and the correlator internal Branch 5 respe...

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Abstract

The invention discloses a global navigation satellite system (GNSS) receiver system based on a delay locked loop (DLL)-Rake tracking loop, which belongs to the field of positioning navigation. The system comprises a baseband processing chip module and a GNSS radio frequency processing chip module, wherein the baseband processing chip module consists of correlator modules of 12 channels and a MicroBlaze soft core processor module; the correlator modules of each channel read GNSS digital intermediate frequency signals from the GNSS radio frequency processing chip module, and transmit an accumulative correlation value, obtained by two branches, of a satellite signal and original measured values to the MicroBlaze soft core processing module; and the MicroBlaze soft core processor module controls the correlator modules according to the accumulative correlation value, regulates carrier loops and code loops of the correlator modules to make the system work in different states, and calculates position, velocity and time (PVT) information according to the measured values. The system improves the positioning accuracy and satellite capturing velocity of a GNSS receiver.

Description

technical field [0001] The invention belongs to the field of positioning and navigation, relates to the cross-applied subject of satellite positioning and communication technology, and specifically relates to a GNSS receiver system based on a DLL-Rake (DLL: Code Delay Locked Loop) tracking loop. Background technique [0002] The multipath signal is the main error source of the global navigation satellite system (GNSS) receiver positioning, which causes serious interference to the direct signal reaching the GNSS receiver, which leads to the loop tracking error and ranging error of the receiver, and even causes the satellite The signal is out of lock. Therefore, processing multipath signals plays a very important role. As a multipath signal processing method to improve the performance of communication receivers, Rake technology has been widely used in Wideband Code Division Multiple Access (WCDMA) communication systems. However, due to the great difference between the commun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/13G01S19/37H04B7/185H04B1/7115
Inventor 张淑芳胡青张晶泊孙晓文姜毅
Owner 张淑芳
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