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Fuzzy control-based high-dynamic GPS receiver carrier tracking loop

A GPS receiver and carrier tracking loop technology, applied in the field of navigation, can solve the problems of insufficient coordination dynamic performance and noise suppression ability, and achieve the effects of improving steady-state control accuracy, shrinking the domain of discussion, and fast and accurate tracking

Inactive Publication Date: 2012-09-05
BEIHANG UNIV
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Problems solved by technology

[0005] The purpose of the present invention is in order to overcome the deficiencies in the coordination of dynamic performance and noise suppression ability of existing high dynamic GPS carrier tracking technology, proposes a kind of high dynamic GPS receiver carrier tracking loop based on fuzzy control, this tracking loop can Adaptively adjust the bandwidth to achieve fast and accurate tracking of highly dynamic carrier signals

Method used

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  • Fuzzy control-based high-dynamic GPS receiver carrier tracking loop
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  • Fuzzy control-based high-dynamic GPS receiver carrier tracking loop

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Embodiment Construction

[0035] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0036] A kind of high dynamic GPS receiver carrier tracking loop based on fuzzy control of the present invention, as figure 1 As shown, it mainly includes a pseudocode digitally controlled oscillator 1, a despreader 2, a mixer 3, a correlation unit 4, a frequency discriminator 5, a phase detector 6, an intelligent loop filter 7 and a carrier digitally controlled oscillator 14.

[0037] Pseudo-code numerical control oscillator 1 generates local C / A code sequence, despreader 2 performs correlation calculation on C / A code sequence and GPS digital intermediate frequency signal, strips the modulated pseudo-code data in GPS digital intermediate frequency signal, and obtains despread GPS digital intermediate frequency signal.

[0038]The carrier numerically controlled oscillator 14 generates a sine carrier signal and a cosine carrier signal, and the despread GPS digital in...

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Abstract

The invention discloses a fuzzy control-based high-dynamic global positioning system (GPS) receiver carrier tracking loop, which belongs to the technical field of navigation. By using a fuzzy control theory, a fuzzy logic controller and an accuracy improvement unit are arranged in a Costas carrier tracking loop, wherein the fuzzy controller can self-adaptively regulate loop bandwidth according todynamic conditions of an input frequency error and a phase error so as to shorten loop response time; the accuracy improvement unit eliminates trembling phenomenon in the process of fuzzy control by a linear interpolation and discourse domain transformation method so as to improve steady-state tracking accuracy; and a fuzzy control amount of which the accuracy is improved drives a carrier digitalcontrol oscillator to generate local sine and cosine carrier signals so as to keep tracking and locking an input carrier signal. The fuzzy control-based high-dynamic GPS receiver carrier tracking loop has the advantages of high dynamic tracking performance, high noise suppression capacity, and capacity of quickly and steadily implementing the process of tracking a high-dynamic low-signal-to-noiseratio GPS carrier signal and keeping high frequency tracking accuracy.

Description

technical field [0001] The invention belongs to the technical field of navigation and relates to a high dynamic GPS receiver carrier tracking loop based on fuzzy control. Background technique [0002] The Global Positioning System (GPS) is a precision satellite navigation and positioning system. It has the advantages of high precision, all-weather, and global coverage. It has been widely valued and applied in military and civilian fields. In GPS receivers, stable tracking of satellite signals is the prerequisite for the system to work normally, and it has always been the research focus of receiver technology. Due to the high-speed movement of the carrier, the carrier signal received by the GPS receiver has a Doppler frequency shift, and this frequency shift may be accompanied by a certain acceleration and jerk, and a large frequency shift rate will cause the carrier signal of the receiver to The loop tracking is out of lock, and the purpose of precise synchronization betwee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/29
Inventor 王新龙纪新春
Owner BEIHANG UNIV
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