Combined Phase Locked Loop and Subcarrier Loop with Phase Detection and Tracking Loop

A technology of carrier tracking loop and tracking loop, which is applied in the field of satellite navigation and tracking, and can solve the problem of large phase detection error of code tracking loop

Active Publication Date: 2015-12-30
TIANJIN 712 COMM & BROADCASTING CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] However, the lead and lag code branches respectively include and two branches, if only a single The phase detection of the branch will cause a large error in the phase detection of the code tracking loop

Method used

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  • Combined Phase Locked Loop and Subcarrier Loop with Phase Detection and Tracking Loop
  • Combined Phase Locked Loop and Subcarrier Loop with Phase Detection and Tracking Loop
  • Combined Phase Locked Loop and Subcarrier Loop with Phase Detection and Tracking Loop

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Embodiment Construction

[0053] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0054] A joint phase detection and tracking loop of a phase-locked loop and a subcarrier loop, such as figure 1 As shown, it includes carrier tracking loop 01, subcarrier tracking loop 02 and spreading code tracking loop 03; the carrier tracking loop is referred to as PLL, the subcarrier tracking loop is referred to as SLL, and the spreading code tracking loop is referred to as DLL.

[0055] The carrier tracking loop 01 includes a carrier numerically controlled oscillator 102, a cross-correlation processing unit (multiplier) 101, an integral clearing unit 110, a combined carrier loop and subcarrier loop phase detector 106, and a PLL loop filter 109;

[0056] The subcarrier tracking loop 02 includes a subcarrier numerically controlled oscillator 103, a cross-correlation processing unit (multiplier) 101, an integral clearing unit 110, a carrier loop and subcarr...

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Abstract

The present invention proposes a combined phase detection and tracking loop of a phase-locked loop and a subcarrier loop, including a carrier tracking loop, a subcarrier tracking loop, and a spread code tracking loop, wherein the carrier tracking loop first conducts a process on the received intermediate frequency BOC signal Carrier stripping processing, the obtained output signal is used as the input of the subcarrier tracking loop, multiplied by the local cosine and sine signals generated by the subcarrier numerical control oscillator, and the obtained signal is input into the spread spectrum code tracking loop for code phase tracking, for binary For the ambiguity problem of offset carrier signal tracking, a joint phase detection method is used in the joint tracking loop of carrier tracking loop and subcarrier tracking loop to solve the phase ambiguity problem caused by noise when the signal-to-noise ratio is low. The method improves the accuracy of phase detection and realizes precise tracking.

Description

technical field [0001] The invention relates to the technical field of satellite navigation tracking, in particular to a combined tracking loop of a BOC modulation signal phase-locked loop and a subcarrier loop. Background technique [0002] In the GPS system, Galileo system and China Beidou system, Binary Phase Shift Keying (BPSK) modulation is the first modulation method used in the satellite navigation system. Performance and reducing the interference between adjacent signals become the focus of research. The stand-alone European Galileo system will use similar new navigation signals in both the same and new frequency bands. Although some new navigation signals will continue to use BPSK modulation, most of them will use the new Binary Offset Carrier (BOC) modulation method, the main idea of ​​BOC modulation is to reduce the interference between BPSK modulated signals. [0003] Binary Offset Carrier (BOC) modulation is based on BPSK modulation, adding a square wave as a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/24
CPCG01S19/29G01S19/30
Inventor 张洪伟王祥峰马俊峰常亮李云娜
Owner TIANJIN 712 COMM & BROADCASTING CO LTD
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