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Carrier tracking method and carrier tracking loop of a GNSS receiver

A carrier tracking loop and carrier tracking technology, which is used in radio wave measurement systems, satellite radio beacon positioning systems, measurement devices, etc. Effects of cost, reduction in circuit scale, and simplification of circuit structure

Active Publication Date: 2011-11-30
HERONAV BEIJING TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the object of the present invention is to provide a carrier tracking method and a carrier tracking loop of a GNSS receiver, which solve the problems of large circuit scale, complex circuit structure and high requirements on device performance in the prior art

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  • Carrier tracking method and carrier tracking loop of a GNSS receiver

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Embodiment Construction

[0032] For reference and clarity, descriptions, abbreviations or abbreviations of technical terms used in the following text are summarized as follows:

[0033] GNSS: Global Navigation Satellite System, Global Navigation Satellite System;

[0034] GPS: Global Positioning System, Global Positioning System;

[0035] GLONASS: GLONASS system;

[0036] Compass: Beidou system;

[0037] Galileo: Galileo positioning system;

[0038] NCO: numerically controlled oscillator;

[0039] PSK: phase shift keying, phase shift keying;

[0040] BPSK: Binary Phase Shift Keying, phase shift keying;

[0041] FPGA: Field-Programmable Gate Array, field-programmable gate array;

[0042] ASIC: Application Specific Integrated Circuit, application specific integrated circuit.

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely...

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Abstract

The invention discloses a carrier tracking method of a GNSS (Global Navigation Satellite System) receiver. The method comprises the following steps of: using two local intermediate frequency carriers with 9 degrees of phase difference to demodulate a received intermediate frequency signal; using a local spectrum spreading code to de-spread two baseband signals I and Q respectively; respectively multiplying the two de-spread baseband signals I1 and Q1 by a code count; obtaining two operation results I2 and Q2; calculating a product of the de-spread baseband signal I1 and the operation result Q2 and a difference between the de-spread baseband signal I2 and the operation result Q1; according to the difference, determining a frequency offset number; and adjusting the frequencies of the two local intermediate frequency carriers by using the frequency offset number. According to the carrier tracking method disclosed by the invention, only one set of intermediate frequency carriers is used, so that the circuit scale is reduced, and the circuit structure is simplified; an multiplying operation and an additive operation are only related in the carrier tracking process, therefore, the carrier tracking process can be completed through a basic multiplier and an adder, and the system cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of GNSS signal processing, and in particular relates to a carrier tracking method and a carrier tracking loop of a GNSS receiver. Background technique [0002] GNSS (Global Navigation Satellite System, Global Navigation Satellite System) receivers can be applied to GPS (Global Positioning System, Global Positioning System) in the United States, GLONASS (Glonass System) in Russia, Compass (Beidou System) in China and the European Union Galileo (Galileo positioning system). [0003] GNSS receiver is a device for receiving satellite signals. Its main function is to receive satellite signals to obtain necessary navigation and positioning information and observations, and realize real-time navigation and positioning through simple data processing. After the GNSS receiver captures the signal transmitted by the satellite, it obtains the carrier frequency and spreading code of the satellite, and then can demodulate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/29
Inventor 王雪
Owner HERONAV BEIJING TECH DEV
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